diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/consulHealth.png | bin | 0 -> 301016 bytes | |||
| -rw-r--r-- | docs/index.rst | 10 | ||||
| -rw-r--r-- | docs/oomLogoV2-Configure.png | bin | 0 -> 50668 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Delete.png | bin | 0 -> 48038 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Deploy.png | bin | 0 -> 48500 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Heal.png | bin | 0 -> 48092 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Monitor.png | bin | 0 -> 50051 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Scale.png | bin | 0 -> 49430 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-Upgrade.png | bin | 0 -> 49259 bytes | |||
| -rw-r--r-- | docs/oomLogoV2-medium.png | bin | 0 -> 31090 bytes | |||
| -rw-r--r-- | docs/oom_cloud_setup_guide.rst | 64 | ||||
| -rw-r--r-- | docs/oom_developer_guide.rst | 637 | ||||
| -rw-r--r-- | docs/oom_project_description.rst | 90 | ||||
| -rw-r--r-- | docs/oom_quickstart_guide.rst | 173 | ||||
| -rw-r--r-- | docs/oom_user_guide.rst | 581 |
15 files changed, 1553 insertions, 2 deletions
diff --git a/docs/consulHealth.png b/docs/consulHealth.png Binary files differnew file mode 100644 index 0000000000..cd7e730c39 --- /dev/null +++ b/docs/consulHealth.png diff --git a/docs/index.rst b/docs/index.rst index 0fcfad9bd4..bf7cd9e5ba 100644 --- a/docs/index.rst +++ b/docs/index.rst @@ -1,9 +1,15 @@ .. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + OOM Documentation Repository ---------------------------- .. toctree:: :maxdepth: 2 - OOM Project Description/oom_project_description.rst - OOM User Guide/oom_user_guide.rst + oom_project_description.rst + oom_quickstart_guide.rst + oom_user_guide.rst + oom_developer_guide.rst + oom_cloud_setup_guide.rst diff --git a/docs/oomLogoV2-Configure.png b/docs/oomLogoV2-Configure.png Binary files differnew file mode 100644 index 0000000000..bdb1ece10c --- /dev/null +++ b/docs/oomLogoV2-Configure.png diff --git a/docs/oomLogoV2-Delete.png b/docs/oomLogoV2-Delete.png Binary files differnew file mode 100644 index 0000000000..10c43d2fb3 --- /dev/null +++ b/docs/oomLogoV2-Delete.png diff --git a/docs/oomLogoV2-Deploy.png b/docs/oomLogoV2-Deploy.png Binary files differnew file mode 100644 index 0000000000..706097cd6c --- /dev/null +++ b/docs/oomLogoV2-Deploy.png diff --git a/docs/oomLogoV2-Heal.png b/docs/oomLogoV2-Heal.png Binary files differnew file mode 100644 index 0000000000..97ac58e9ec --- /dev/null +++ b/docs/oomLogoV2-Heal.png diff --git a/docs/oomLogoV2-Monitor.png b/docs/oomLogoV2-Monitor.png Binary files differnew file mode 100644 index 0000000000..c9a184ac37 --- /dev/null +++ b/docs/oomLogoV2-Monitor.png diff --git a/docs/oomLogoV2-Scale.png b/docs/oomLogoV2-Scale.png Binary files differnew file mode 100644 index 0000000000..140e5ca54f --- /dev/null +++ b/docs/oomLogoV2-Scale.png diff --git a/docs/oomLogoV2-Upgrade.png b/docs/oomLogoV2-Upgrade.png Binary files differnew file mode 100644 index 0000000000..d51f6cfcde --- /dev/null +++ b/docs/oomLogoV2-Upgrade.png diff --git a/docs/oomLogoV2-medium.png b/docs/oomLogoV2-medium.png Binary files differnew file mode 100644 index 0000000000..20aea693e0 --- /dev/null +++ b/docs/oomLogoV2-medium.png diff --git a/docs/oom_cloud_setup_guide.rst b/docs/oom_cloud_setup_guide.rst new file mode 100644 index 0000000000..9cccc91431 --- /dev/null +++ b/docs/oom_cloud_setup_guide.rst @@ -0,0 +1,64 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + +.. figure:: oomLogoV2-medium.png + :align: right + +.. _cloud-setup-guide-label: + +OOM Cloud Setup Guide +##################### + +OOM deploys and manages ONAP on a pre-established Kubernetes_ cluster - the +creation of this cluster is outside of the scope of the OOM project as there +are many options including public clouds with pre-established environments. +However, this guide includes instructions for how to create and use some of the +more popular environments which could be used to host ONAP. If creation of a +Kubernetes cluster is required, the life-cycle of this cluster is independent +of the life-cycle of the ONAP components themselves. Much like an OpenStack +environment, the Kubernetes environment may be used for an extended period of +time, possibly spanning multiple ONAP releases. + +.. note:: + Inclusion of a cloud technology or provider in this guide does not imply any + endorsement of this technology. + +.. _Kubernetes: https://kubernetes.io/ + +The versions of Kubernetes that are supported by OOM are as follows: + +.. table:: OOM Software Requirements + + ============== ========== ===== ======= ======== + Release Kubernetes Helm kubectl Docker + ============== ========== ===== ======= ======== + amsterdam 1.7.x 2.3.x 1.7.x 1.12.x + beijing/master 1.8.5 2.7.x 1.8.5 1.12.x + ============== ========== ===== ======= ======== + +Minimum Hardware Requirements +============================= + + +Cloud Installation +================== + +#. OOM supports deployment on major public clouds. The following guides + provide instructions on how to deploy ONAP on these clouds: + + - Microsoft Azure, + - Amazon AWS, + - Google GCD, + - VMware VIO, + - IBM, and + - Openstack + +#. Alternatively, OOM can be deployed on a private set of physical hosts or VMs + (or even a combination of the two). The following guides describe how to + create a Kubernetes cluster with popular tools: + + - Setting up Kubernetes with Rancher (recommended) + - Setting up Kubernetes with Kubeadm + - Setting up Kubernetes with Cloudify + diff --git a/docs/oom_developer_guide.rst b/docs/oom_developer_guide.rst new file mode 100644 index 0000000000..1c18044b70 --- /dev/null +++ b/docs/oom_developer_guide.rst @@ -0,0 +1,637 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + +.. Links +.. _Helm: https://docs.helm.sh/ +.. _Kubernetes: https://Kubernetes.io/ +.. _Docker: https://www.docker.com/ +.. _Nexus: https://nexus.onap.org/#welcome +.. _AWS Elastic Block Store: https://aws.amazon.com/ebs/ +.. _Azure File: https://docs.microsoft.com/en-us/azure/storage/files/storage-files-introduction +.. _GCE Persistent Disk: https://cloud.google.com/compute/docs/disks/ +.. _Gluster FS: https://www.gluster.org/ +.. _Kubernetes Storage Class: https://Kubernetes.io/docs/concepts/storage/storage-classes/ +.. _Assigning Pods to Nodes: https://Kubernetes.io/docs/concepts/configuration/assign-pod-node/ + +.. _developer-guide-label: + +OOM Developer Guide +################### + +.. figure:: oomLogoV2-medium.png + :align: right + +ONAP consists of a large number of components, each of which are substantial +projects within themselves, which results in a high degree of complexity in +deployment and management. To cope with this complexity the ONAP Operations +Manager (OOM) uses a Helm_ model of ONAP - Helm being the primary management +system for Kubernetes_ container systems - to drive all user driven life-cycle +management operations. The Helm model of ONAP is composed of a set of +hierarchical Helm charts that define the structure of the ONAP components and +the configuration of these components. These charts are fully parameterized +such that a single environment file defines all of the parameters needed to +deploy ONAP. A user of ONAP may maintain several such environment files to +control the deployment of ONAP in multiple environments such as development, +pre-production, and production. + +The following sections describe how the ONAP Helm charts are constructed. + +.. contents:: + :depth: 3 + :local: +.. + +Container Background +==================== +Linux containers allow for an application and all of its operating system +dependencies to be packaged and deployed as a single unit without including a +guest operating system as done with virtual machines. The most popular +container solution is Docker_ which provides tools for container management +like the Docker Host (dockerd) which can create, run, stop, move, or delete a +container. Docker has a very popular registry of containers images that can be +used by any Docker system; however, in the ONAP context, Docker images are +built by the standard CI/CD flow and stored in Nexus_ repositories. OOM uses +the "standard" ONAP docker containers and three new ones specifically created +for OOM. + +Containers are isolated from each other primarily via name spaces within the +Linux kernel without the need for multiple guest operating systems. As such, +multiple containers can be deployed with little overhead such as all of ONAP +can be deployed on a single host. With some optimization of the ONAP components +(e.g. elimination of redundant database instances) it may be possible to deploy +ONAP on a single laptop computer. + +Helm Charts +=========== + +Standard Chart Format +--------------------- + +Helm charts are available in the open-source community for a wide variety of +common software components which are used in ONAP and where possible. + + +Chart Hierarchy +--------------- + +Dependency Management +--------------------- +These Helm charts describe the desired state +of an ONAP deployment and instruct the Kubernetes container manager as to how +to maintain the deployment in this state. These dependencies dictate the order +in-which the containers are started for the first time such that such +dependencies are always met without arbitrary sleep times between container +startups. For example, the SDC back-end container requires the Elastic-Search, +Cassandra and Kibana containers within SDC to be ready and is also dependent on +DMaaP (or the message-router) to be ready - where ready implies the built-in +"readiness" probes succeeded - before becoming fully operational. When an +initial deployment of ONAP is requested the current state of the system is NULL +so ONAP is deployed by the Kubernetes manager as a set of Docker containers on +one or more predetermined hosts. The hosts could be physical machines or +virtual machines. When deploying on virtual machines the resulting system will +be very similar to "Heat" based deployments, i.e. Docker containers running +within a set of VMs, the primary difference being that the allocation of +containers to VMs is done dynamically with OOM and statically with "Heat". +Example SO deployment descriptor file shows SO's dependency on its mariadb +data-base component: + +SO deployment specification excerpt: + +.. code-block:: yaml + + apiVersion: extensions/v1beta1 + kind: Deployment + metadata: + name: {{ include "common.name" . }} + namespace: {{ include "common.namespace" . }} + labels: + app: {{ include "common.name" . }} + chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }} + release: {{ .Release.Name }} + heritage: {{ .Release.Service }} + spec: + replicas: {{ .Values.replicaCount }} + template: + metadata: + labels: + app: {{ include "common.name" . }} + release: {{ .Release.Name }} + spec: + initContainers: + - command: + - /root/ready.py + args: + - --container-name + - so-mariadb + env: + ... + +Kubernetes Container Orchestration +================================== +The ONAP components are managed by the Kubernetes_ container management system +which maintains the desired state of the container system as described by one +or more deployment descriptors - similar in concept to OpenStack HEAT +Orchestration Templates. The following sections describe the fundamental +objects managed by Kubernetes, the network these components use to communicate +with each other and other entities outside of ONAP and the templates that +describe the configuration and desired state of the ONAP components. + +Name Spaces +----------- +Within the namespaces are Kubernetes services that provide external connectivity to pods that host Docker containers. + +ONAP Components to Kubernetes Object Relationships +-------------------------------------------------- +Kubernetes deployments consist of multiple objects: + +- **nodes** - a worker machine - either physical or virtual - that hosts + multiple containers managed by Kubernetes. +- **services** - an abstraction of a logical set of pods that provide a + micro-service. +- **pods** - one or more (but typically one) container(s) that provide specific + application functionality. +- **persistent volumes** - One or more permanent volumes need to be established + to hold non-ephemeral configuration and state data. + +The relationship between these objects is shown in the following figure: + +.. .. uml:: +.. +.. @startuml +.. node PH { +.. component Service { +.. component Pod0 +.. component Pod1 +.. } +.. } +.. +.. database PV +.. @enduml + +.. figure:: kubernetes_objects.png + +OOM uses these Kubernetes objects as described in the following sections. + +Nodes +~~~~~ +OOM works with both physical and virtual worker machines. + +* Virtual Machine Deployments - If ONAP is to be deployed onto a set of virtual machines, the creation of the VMs is outside of the scope of OOM and could be done in many ways, such as + + * manually, for example by a user using the OpenStack Horizon dashboard or AWS EC2, or + * automatically, for example with the use of a OpenStack Heat Orchestration Template which builds an ONAP stack, Azure ARM template, AWS CloudFormation Template, or + * orchestrated, for example with Cloudify creating the VMs from a TOSCA template and controlling their life cycle for the life of the ONAP deployment. + +* Physical Machine Deployments - If ONAP is to be deployed onto physical machines there are several options but the recommendation is to use Rancher along with Helm to associate hosts with a Kubernetes cluster. + +Pods +~~~~ +A group of containers with shared storage and networking can be grouped together into a Kubernetes pod. All of the containers within a pod are co-located and co-scheduled so they operate as a single unit. Within ONAP Amsterdam release, pods are mapped one-to-one to docker containers although this may change in the future. As explained in the Services section below the use of Pods within each ONAP component is abstracted from other ONAP components. + +Services +~~~~~~~~ +OOM uses the Kubernetes service abstraction to provide a consistent access +point for each of the ONAP components independent of the pod or container +architecture of that component. For example, the SDNC component may introduce +OpenDaylight clustering as some point and change the number of pods in this +component to three or more but this change will be isolated from the other ONAP +components by the service abstraction. A service can include a load balancer +on its ingress to distribute traffic between the pods and even react to dynamic +changes in the number of pods if they are part of a replica set. + +Persistent Volumes +~~~~~~~~~~~~~~~~~~ +To enable ONAP to be deployed into a wide variety of cloud infrastructures a +flexible persistent storage architecture, built on Kubernetes persistent +volumes, provides the ability to define the physical storage in a central +location and have all ONAP components securely store their data. + +When deploying ONAP into a public cloud, available storage services such as +`AWS Elastic Block Store`_, `Azure File`_, or `GCE Persistent Disk`_ are +options. Alternatively, when deploying into a private cloud the storage +architecture might consist of Fiber Channel, `Gluster FS`_, or iSCSI. Many +other storage options existing, refer to the `Kubernetes Storage Class`_ +documentation for a full list of the options. The storage architecture may vary +from deployment to deployment but in all cases a reliable, redundant storage +system must be provided to ONAP with which the state information of all ONAP +components will be securely stored. The Storage Class for a given deployment is +a single parameter listed in the ONAP values.yaml file and therefore is easily +customized. Operation of this storage system is outside the scope of the OOM. + +.. code-block:: yaml + + Insert values.yaml code block with storage block here + +Once the storage class is selected and the physical storage is provided, the +ONAP deployment step creates a pool of persistent volumes within the given +physical storage that is used by all of the ONAP components. ONAP components +simply make a claim on these persistent volumes (PV), with a persistent volume +claim (PVC), to gain access to their storage. + +The following figure illustrates the relationships between the persistent +volume claims, the persistent volumes, the storage class, and the physical +storage. + +.. graphviz:: + + digraph PV { + label = "Persistance Volume Claim to Physical Storage Mapping" + { + node [shape=cylinder] + D0 [label="Drive0"] + D1 [label="Drive1"] + Dx [label="Drivex"] + } + { + node [shape=Mrecord label="StorageClass:ceph"] + sc + } + { + node [shape=point] + p0 p1 p2 + p3 p4 p5 + } + subgraph clusterSDC { + label="SDC" + PVC0 + PVC1 + } + subgraph clusterSDNC { + label="SDNC" + PVC2 + } + subgraph clusterSO { + label="SO" + PVCn + } + PV0 -> sc + PV1 -> sc + PV2 -> sc + PVn -> sc + + sc -> {D0 D1 Dx} + PVC0 -> PV0 + PVC1 -> PV1 + PVC2 -> PV2 + PVCn -> PVn + + # force all of these nodes to the same line in the given order + subgraph { + rank = same; PV0;PV1;PV2;PVn;p0;p1;p2 + PV0->PV1->PV2->p0->p1->p2->PVn [style=invis] + } + + subgraph { + rank = same; D0;D1;Dx;p3;p4;p5 + D0->D1->p3->p4->p5->Dx [style=invis] + } + + } + +In-order for an ONAP component to use a persistent volume it must make a claim +against a specific persistent volume defined in the ONAP common charts. Note +that there is a one-to-one relationship between a PVC and PV. The following is +an excerpt from a component chart that defines a PVC: + +.. code-block:: yaml + + Insert PVC example here + +OOM Networking with Kubernetes +------------------------------ + +- DNS +- Ports - Flattening the containers also expose port conflicts between the containers which need to be resolved. + +Node Ports +~~~~~~~~~~ + +Pod Placement Rules +------------------- +OOM will use the rich set of Kubernetes node and pod affinity / +anti-affinity rules to minimize the chance of a single failure resulting in a +loss of ONAP service. Node affinity / anti-affinity is used to guide the +Kubernetes orchestrator in the placement of pods on nodes (physical or virtual +machines). For example: + +- if a container used Intel DPDK technology the pod may state that it as + affinity to an Intel processor based node, or +- geographical based node labels (such as the Kubernetes standard zone or + region labels) may be used to ensure placement of a DCAE complex close to the + VNFs generating high volumes of traffic thus minimizing networking cost. + Specifically, if nodes were pre-assigned labels East and West, the pod + deployment spec to distribute pods to these nodes would be: + +.. code-block:: yaml + + nodeSelector: + failure-domain.beta.Kubernetes.io/region: {{ .Values.location }} + +- "location: West" is specified in the values.yaml file used to deploy + one DCAE cluster and "location: East" is specified in a second values.yaml + file (see OOM Configuration Management for more information about + configuration files like the values.yamlfile). + +Node affinity can also be used to achieve geographic redundancy if pods are +assigned to multiple failure domains. For more information refer to `Assigning +Pods to Nodes`_. + +.. note:: + One could use Pod to Node assignment to totally constrain Kubernetes when + doing initial container assignment to replicate the Amsterdam release + OpenStack Heat based deployment. Should one wish to do this, each VM would + need a unique node name which would be used to specify a node constaint + for every component. These assignment could be specified in an environment + specific values.yaml file. Constraining Kubernetes in this way is not + recommended. + +Kubernetes has a comprehensive system called Taints and Tolerations that can be +used to force the container orchestrator to repel pods from nodes based on +static events (an administrator assigning a taint to a node) or dynamic events +(such as a node becoming unreachable or running out of disk space). There are +no plans to use taints or tolerations in the ONAP Beijing release. Pod +affinity / anti-affinity is the concept of creating a spacial relationship +between pods when the Kubernetes orchestrator does assignment (both initially +an in operation) to nodes as explained in Inter-pod affinity and anti-affinity. +For example, one might choose to co-located all of the ONAP SDC containers on a +single node as they are not critical runtime components and co-location +minimizes overhead. On the other hand, one might choose to ensure that all of +the containers in an ODL cluster (SDNC and APPC) are placed on separate nodes +such that a node failure has minimal impact to the operation of the cluster. +An example of how pod affinity / anti-affinity is shown below: + +Pod Affinity / Anti-Affinity + +.. code-block:: yaml + + apiVersion: v1 + kind: Pod + metadata: + name: with-pod-affinity + spec: + affinity: + podAffinity: + requiredDuringSchedulingIgnoredDuringExecution: + - labelSelector: + matchExpressions: + - key: security + operator: In + values: + - S1 + topologyKey: failure-domain.beta.Kubernetes.io/zone + podAntiAffinity: + preferredDuringSchedulingIgnoredDuringExecution: + - weight: 100 + podAffinityTerm: + labelSelector: + matchExpressions: + - key: security + operator: In + values: + - S2 + topologyKey: Kubernetes.io/hostname + containers: + - name: with-pod-affinity + image: gcr.io/google_containers/pause:2.0 + +This example contains both podAffinity and podAntiAffinity rules, the first +rule is is a must (requiredDuringSchedulingIgnoredDuringExecution) while the +second will be met pending other considerations +(preferredDuringSchedulingIgnoredDuringExecution). Preemption Another feature +that may assist in achieving a repeatable deployment in the presence of faults +that may have reduced the capacity of the cloud is assigning priority to the +containers such that mission critical components have the ability to evict less +critical components. Kubernetes provides this capability with Pod Priority and +Preemption. Prior to having more advanced production grade features available, +the ability to at least be able to re-deploy ONAP (or a subset of) reliably +provides a level of confidence that should an outage occur the system can be +brought back on-line predictably. + +Health Checks +------------- + +Monitoring of ONAP components is configured in the agents within JSON files and +stored in gerrit under the consul-agent-config, here is an example from the AAI +model loader (aai-model-loader-health.json): + +.. code-block:: json + + { + "service": { + "name": "A&AI Model Loader", + "checks": [ + { + "id": "model-loader-process", + "name": "Model Loader Presence", + "script": "/consul/config/scripts/model-loader-script.sh", + "interval": "15s", + "timeout": "1s" + } + ] + } + } + +Liveness Probes +--------------- + +These liveness probes can simply check that a port is available, that a +built-in health check is reporting good health, or that the Consul health check +is positive. For example, to monitor the SDNC component has following liveness +probe can be found in the SDNC DB deployment specification: + +.. code-block:: yaml + + sdnc db liveness probe + + livenessProbe: + exec: + command: ["mysqladmin", "ping"] + initialDelaySeconds: 30 periodSeconds: 10 + timeoutSeconds: 5 + +The 'initialDelaySeconds' control the period of time between the readiness +probe succeeding and the liveness probe starting. 'periodSeconds' and +'timeoutSeconds' control the actual operation of the probe. Note that +containers are inherently ephemeral so the healing action destroys failed +containers and any state information within it. To avoid a loss of state, a +persistent volume should be used to store all data that needs to be persisted +over the re-creation of a container. Persistent volumes have been created for +the database components of each of the projects and the same technique can be +used for all persistent state information. + + +Configuration Management +======================== + +ONAP is a large system composed of many components - each of which are complex +systems in themselves - that needs to be deployed in a number of different +ways. For example, within a single operator's network there may be R&D +deployments under active development, pre-production versions undergoing system +testing and production systems that are operating live networks. Each of these +deployments will differ in significant ways, such as the version of the +software images deployed. In addition, there may be a number of application +specific configuration differences, such as operating system environment +variables. The following describes how the Helm configuration management +system is used within the OOM project to manage both ONAP infrastructure +configuration as well as ONAP components configuration. + +One of the artifacts that OOM/Kubernetes uses to deploy ONAP components is the +deployment specification, yet another yaml file. Within these deployment specs +are a number of parameters as shown in the following mariadb example: + +.. code-block:: yaml + + apiVersion: extensions/v1beta1 + kind: Deployment + metadata: + name: mariadb + spec: + <...> + template: + <...> + spec: + hostname: mariadb + containers: + - args: + image: nexus3.onap.org:10001/mariadb:10.1.11 + name: "mariadb" + env: + - name: MYSQL_ROOT_PASSWORD + value: password + - name: MARIADB_MAJOR + value: "10.1" + <...> + imagePullSecrets: + - name: onap-docker-registry-key + +Note that within the deployment specification, one of the container arguments +is the key/value pair image: nexus3.onap.org:10001/mariadb:10.1.11 which +specifies the version of the mariadb software to deploy. Although the +deployment specifications greatly simplify deployment, maintenance of the +deployment specifications themselves become problematic as software versions +change over time or as different versions are required for different +deployments. For example, if the R&D team needs to deploy a newer version of +mariadb than what is currently used in the production environment, they would +need to clone the deployment specification and change this value. Fortunately, +this problem has been solved with the templating capabilities of Helm. + +The following example shows how the deployment specifications are modified to +incorporate Helm templates such that key/value pairs can be defined outside of +the deployment specifications and passed during instantiation of the component. + +.. code-block:: yaml + + apiVersion: extensions/v1beta1 + kind: Deployment + metadata: + name: mariadb + namespace: "{{ .Values.nsPrefix }}-mso" + spec: + <...> + template: + <...> + spec: + hostname: mariadb + containers: + - args: + image: {{ .Values.image.mariadb }} + imagePullPolicy: {{ .Values.pullPolicy }} + name: "mariadb" + env: + - name: MYSQL_ROOT_PASSWORD + value: password + - name: MARIADB_MAJOR + value: "10.1" + <...> + imagePullSecrets: + - name: "{{ .Values.nsPrefix }}-docker-registry-key"apiVersion: extensions/v1beta1 + kind: Deployment + metadata: + name: mariadb + namespace: "{{ .Values.nsPrefix }}-mso" + spec: + <...> + template: + <...> + spec: + hostname: mariadb + containers: + - args: + image: {{ .Values.image.mariadb }} + imagePullPolicy: {{ .Values.pullPolicy }} + name: "mariadb" + env: + - name: MYSQL_ROOT_PASSWORD + value: password + - name: MARIADB_MAJOR + value: "10.1" + <...> + imagePullSecrets: + - name: "{{ .Values.nsPrefix }}-docker-registry-key" + +This version of the deployment specification has gone through the process of +templating values that are likely to change between deployments. Note that the +image is now specified as: image: {{ .Values.image.mariadb }} instead of a +string used previously. During the deployment phase, Helm (actually the Helm +sub-component Tiller) substitutes the {{ .. }} entries with a variable defined +in a values.yaml file. The content of this file is as follows: + +.. code-block:: yaml + + nsPrefix: onap + pullPolicy: IfNotPresent + image: + readiness: oomk8s/readiness-check:1.0.0 + mso: nexus3.onap.org:10001/openecomp/mso:1.0-STAGING-latest + mariadb: nexus3.onap.org:10001/mariadb:10.1.11 + +Within the values.yaml file there is an image section with the key/value pair +mariadb: nexus3.onap.org:10001/mariadb:10.1.11 which is the same value used in +the non-templated version. Once all of the substitutions are complete, the +resulting deployment specification ready to be used by Kubernetes. + +Also note that in this example, the namespace key/value pair is specified in +the values.yaml file. This key/value pair will be global across the entire +ONAP deployment and is therefore a prime example of where configuration +hierarchy can be very useful. + +When creating a deployment template consider the use of default values if +appropriate. Helm templating has built in support for DEFAULT values, here is +an example: + +.. code-block:: yaml + + imagePullSecrets: + - name: "{{ .Values.nsPrefix | default "onap" }}-docker-registry-key" + +The pipeline operator ("|") used here hints at that power of Helm templates in +that much like an operating system command line the pipeline operator allow +over 60 Helm functions to be embedded directly into the template (note that the +Helm template language is a superset of the Go template language). These +functions include simple string operations like upper and more complex flow +control operations like if/else. + + +ONAP Application Configuration +------------------------------ + +Environment Files +~~~~~~~~~~~~~~~~~ + +MSB Integration +=============== +.. MISC +.. ==== +.. Note that although OOM uses Kubernetes facilities to minimize the effort +.. required of the ONAP component owners to implement a successful rolling upgrade +.. strategy there are other considerations that must be taken into consideration. +.. For example, external APIs - both internal and external to ONAP - should be +.. designed to gracefully accept transactions from a peer at a different software +.. version to avoid deadlock situations. Embedded version codes in messages may +.. facilitate such capabilities. +.. +.. Within each of the projects a new configuration repository contains all of the +.. project specific configuration artifacts. As changes are made within the +.. project, it's the responsibility of the project team to make appropriate +.. changes to the configuration data. diff --git a/docs/oom_project_description.rst b/docs/oom_project_description.rst new file mode 100644 index 0000000000..7eb79503ee --- /dev/null +++ b/docs/oom_project_description.rst @@ -0,0 +1,90 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + +ONAP Operations Manager Project +############################### + +The ONAP Operations Manager (OOM) is responsible for life-cycle management of +the ONAP platform itself; components such as SO, SDNC, etc. It is not +responsible for the management of services, VNFs or infrastructure instantiated +by ONAP or used by ONAP to host such services or VNFs. OOM uses the open-source +Kubernetes container management system as a means to manage the Docker +containers that compose ONAP where the containers are hosted either directly on +bare-metal servers or on VMs hosted by a 3rd party management system. OOM +ensures that ONAP is easily deployable and maintainable throughout its life +cycle while using hardware resources efficiently. + +.. figure:: oomLogoV2-medium.png + :align: right + +In summary OOM provides the following capabilities: + +- **Deploy** - with built-in component dependency management +- **Configure** - unified configuration across all ONAP components +- **Monitor** - real-time health monitoring feeding to a Consul UI and Kubernetes +- **Heal**- failed ONAP containers are recreated automatically +- **Scale** - cluster ONAP services to enable seamless scaling +- **Upgrade** - change-out containers or configuration with little or no service impact +- **Delete** - cleanup individual containers or entire deployments + +OOM supports a wide variety of Kubernetes private clouds - built with Rancher, +Kubeadm or Cloudify - and public cloud infrastructures such as: Microsoft Azure, +Amazon AWS, Google GCD, VMware VIO, and Openstack. + +The OOM documentation is broken into three different areas each targeted at a differnet user: + +- :ref:`quick-start-label` - deploy ONAP on an existing cloud +- :ref:`user-guide-label` - a guide for operators of an ONAP instance +- :ref:`developer-guide-label` - a guide for developers of OOM and ONAP +- :ref:`cloud-setup-guide-label` - a guide for those setting up cloud environments that ONAP will use + +Component Orchestration Overview +================================ +Multiple technologies, templates, and extensible plug-in frameworks are used in +ONAP to orchestrate platform instances of software component artifacts. A few +standard configurations are provide that may be suitable for test, development, +and some production deployments by substitution of local or platform wide +parameters. Larger and more automated deployments may require integration the +component technologies, templates, and frameworks with a higher level of +automated orchestration and control software. Design guidelines are provided to +insure the component level templates and frameworks can be easily integrated +and maintained. The following diagram provides an overview of these with links +to examples and templates for describing new ones. + +.. graphviz:: + + digraph COO { + rankdir="LR"; + + { + node [shape=folder] + oValues [label="values"] + cValues [label="values"] + comValues [label="values"] + sValues [label="values"] + oCharts [label="charts"] + cCharts [label="charts"] + comCharts [label="charts"] + sCharts [label="charts"] + blueprint [label="TOSCA blueprint"] + } + {oom [label="ONAP Operations Manager"]} + {hlo [label="High Level Orchestrator"]} + + + hlo -> blueprint + hlo -> oom + oom -> oValues + oom -> oCharts + oom -> component + oom -> common + common -> comValues + common -> comCharts + component -> cValues + component -> cCharts + component -> subcomponent + subcomponent -> sValues + subcomponent -> sCharts + blueprint -> component + } diff --git a/docs/oom_quickstart_guide.rst b/docs/oom_quickstart_guide.rst new file mode 100644 index 0000000000..655736f0fa --- /dev/null +++ b/docs/oom_quickstart_guide.rst @@ -0,0 +1,173 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + +.. _quick-start-label: + +OOM Quick Start Guide +##################### + +.. figure:: oomLogoV2-medium.png + :align: right + +Once a kubernetes environment is available (follow the instructions in +:ref:`cloud-setup-guide-label` if you don't have a cloud environment +available), follow the following instructions to deploy ONAP. + +**Step 1.** Clone the OOM repository from ONAP gerrit:: + + > git clone http://gerrit.onap.org/r/oom + > cd kubernetes + + +**Step 2.** Customize the onap/values.yaml file to suit your deployment. You +may want to selectively enable or disable ONAP components by changing the +`enabled: true/false` flags as shown below: + +.. code-block:: yaml + + ################################################################# + # Global configuration overrides. + # + # These overrides will affect all helm charts (ie. applications) + # that are listed below and are 'enabled'. + ################################################################# + global: + # Change to an unused port prefix range to prevent port conflicts + # with other instances running within the same k8s cluster + nodePortPrefix: 302 + + # image repositories + repository: nexus3.onap.org:10001 + repositorySecret: eyJuZXh1czMub25hcC5vcmc6MTAwMDEiOnsidXNlcm5hbWUiOiJkb2NrZXIiLCJwYXNzd29yZCI6ImRvY2tlciIsImVtYWlsIjoiQCIsImF1dGgiOiJaRzlqYTJWeU9tUnZZMnRsY2c9PSJ9fQ== + # readiness check + readinessRepository: oomk8s + # logging agent + loggingRepository: docker.elastic.co + + # image pull policy + pullPolicy: Always + + # default mount path root directory referenced + # by persistent volumes and log files + persistence: + mountPath: /dockerdata-nfs + + # flag to enable debugging - application support required + debugEnabled: false + + ################################################################# + # Enable/disable and configure helm charts (ie. applications) + # to customize the ONAP deployment. + ################################################################# + aaf: + enabled: false + aai: + enabled: false + appc: + enabled: false + clamp: + enabled: false + cli: + enabled: false + consul: # Consul Health Check Monitoring + enabled: false + dcaegen2: + enabled: false + esr: + enabled: false + log: + enabled: false + message-router: + enabled: false + mock: + enabled: false + msb: + enabled: false + multicloud: + enabled: false + policy: + enabled: false + portal: + enabled: false + robot: # Robot Health Check + enabled: true + sdc: + enabled: false + sdnc: + enabled: false + so: # Service Orchestrator + enabled: true + + replicaCount: 1 + + liveness: + # necessary to disable liveness probe when setting breakpoints + # in debugger so K8s doesn't restart unresponsive container + enabled: true + + # so server configuration + config: + # message router configuration + dmaapTopic: "AUTO" + # openstack configuration + openStackUserName: "vnf_user" + openStackRegion: "RegionOne" + openStackKeyStoneUrl: "http://1.2.3.4:5000" + openStackServiceTenantName: "service" + openStackEncryptedPasswordHere: "c124921a3a0efbe579782cde8227681e" + + # configure embedded mariadb + mariadb: + config: + mariadbRootPassword: password + uui: + enabled: false + vfc: + enabled: false + vid: + enabled: false + vnfsdk: + enabled: false + +**Step 3.** Build a local Helm repository (from the kubernetes directory):: + + > make all + +**Step 4.** To setup a local Helm server to server up the ONAP charts:: + + > helm serve & + +Note the port number that is listed and use it in the Helm repo add as +follows:: + + > helm repo add local http://127.0.0.1:8879 + +**Step 5.** Verify your Helm repository setup with:: + + > helm repo list + NAME URL + local http://127.0.0.1:8879 + +**Step 6.** Display the charts that available to be deployed:: + + > helm search -l + NAME VERSION DESCRIPTION + local/appc 2.0.0 Application Controller + local/clamp 2.0.0 ONAP Clamp + local/common 2.0.0 Common templates for inclusion in other charts + local/onap 2.0.0 Open Network Automation Platform (ONAP) + local/robot 2.0.0 A helm Chart for kubernetes-ONAP Robot + local/so 2.0.0 ONAP Service Orchestrator + +.. note:: + The of this Helm repository setup is a one time activity. If you make changes to your deployment charts or values be sure to use `make` to update your local Helm repository. + +**Step 7.** Once the repo is setup, installation of ONAP can be done with a +single command:: + + > helm install local/onap -name development + +Use the following to monitor your deployment and determine when ONAP is ready for use:: + + > kubectl get pods --all-namespaces -o=wide diff --git a/docs/oom_user_guide.rst b/docs/oom_user_guide.rst new file mode 100644 index 0000000000..b8e5d1bb9d --- /dev/null +++ b/docs/oom_user_guide.rst @@ -0,0 +1,581 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2018 Amdocs, Bell Canada + +.. Links +.. _Curated applications for Kubernetes: https://github.com/kubernetes/charts +.. _Services: https://kubernetes.io/docs/concepts/services-networking/service/ +.. _ReplicaSet: https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/ +.. _StatefulSet: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/ +.. _Helm Documentation: https://docs.helm.sh/helm/ +.. _Helm: https://docs.helm.sh/ +.. _Kubernetes: https://Kubernetes.io/ + +.. _user-guide-label: + +OOM User Guide +############## + +The ONAP Operations Manager (OOM) provide the ability to manage the entire +life-cycle of an ONAP installation, from the initial deployment to final +decommissioning. This guide provides instructions for users of ONAP to +use the Kubernetes_/Helm_ system as a complete ONAP management system. + +This guide provides many examples of Helm command line operations. For a +complete description of these commands please refer to the `Helm +Documentation`_. + +.. figure:: oomLogoV2-medium.png + :align: right + +The following sections describe the life-cycle operations: + +- Deploy_ - with built-in component dependency management +- Configure_ - unified configuration across all ONAP components +- Monitor_ - real-time health monitoring feeding to a Consul UI and Kubernetes +- Heal_- failed ONAP containers are recreated automatically +- Scale_ - cluster ONAP services to enable seamless scaling +- Upgrade_ - change-out containers or configuration with little or no service impact +- Delete_ - cleanup individual containers or entire deployments + +.. figure:: oomLogoV2-Deploy.png + :align: right + +Deploy +====== + +The OOM team with assistance from the ONAP project teams, have built a +comprehensive set of Helm charts, yaml files very similar to TOSCA files, that +describe the composition of each of the ONAP components and the relationship +within and between components. Using this model Helm is able to deploy all of +ONAP this simple command:: + + > helm install osn/onap + +.. note:: + The osn repo is not currently available so creation of a local repository is + required. + +Helm is able to use charts served up from a repository and comes setup with a +default CNCF provided `Curated applications for Kubernetes`_ repository called +stable which should be removed to avoid confusion:: + + > helm repo remove stable + +.. To setup the Open Source Networking Nexus repository for helm enter:: +.. > helm repo add osn 'https://nexus3.onap.org:10001/helm/helm-repo-in-nexus/master/' + +To prepare your system for an installation of ONAP, you'll need to:: + + > git clone http://gerrit.onap.org/r/oom + > cd kubernetes + +Then build your local Helm repository:: + + > make all + +To setup a local Helm server to server up the ONAP charts:: + + > helm serve & + +Note the port number that is listed and use it in the Helm repo add as follows:: + + > helm repo add local http://127.0.0.1:8879 + +To get a list of all of the available Helm chart repositories:: + + > helm repo list + NAME URL + local http://127.0.0.1:8879 + +The Helm search command reads through all of the repositories configured on the +system, and looks for matches:: + + > helm search -l + NAME VERSION DESCRIPTION + local/appc 2.0.0 Application Controller + local/clamp 2.0.0 ONAP Clamp + local/common 2.0.0 Common templates for inclusion in other charts + local/onap 2.0.0 Open Network Automation Platform (ONAP) + local/robot 2.0.0 A helm Chart for kubernetes-ONAP Robot + local/so 2.0.0 ONAP Service Orchestrator + +In any case, setup of the Helm repository is a one time activity. + +Once the repo is setup, installation of ONAP can be done with a single command:: + + > helm install local/onap -name development + +This will install ONAP from a local repository in a 'development' Helm release. +As described below, to override the default configuration values provided by +OOM, an environment file can be provided on the command line as follows:: + + > helm install local/onap -name development -f onap-development.yaml + +To get a summary of the status of all of the pods (containers) running in your +deployment:: + + > kubectl get pods --all-namespaces -o=wide + +.. note:: + The Kubernetes namespace concept allows for multiple instances of a component + (such as all of ONAP) to co-exist with other components in the same + Kubernetes cluster by isolating them entirely. Namespaces share only the + hosts that form the cluster thus providing isolation between production and + development systems as an example. The OOM deployment of ONAP in Beijing is + now done within a single Kubernetes namespace where in Amsterdam a namespace + was created for each of the ONAP components. + +.. note:: + The Helm `-name` option refers to a release name and not a Kubernetes namespace. + + +To install a specific version of a single ONAP component (`so` in this example) +with the given name enter:: + + > helm install onap/so --version 2.0.1 -n so + +To display details of a specific resource or group of resources type:: + + > kubectl describe pod so-1071802958-6twbl + +where the pod identifier refers to the auto-generated pod identifier. + +.. figure:: oomLogoV2-Configure.png + :align: right + +Configure +========= + +Each project within ONAP has its own configuration data generally consisting +of: environment variables, configuration files, and database initial values. +Many technologies are used across the projects resulting in significant +operational complexity and an inability to apply global parameters across the +entire ONAP deployment. OOM solves this problem by introducing a common +configuration technology, Helm charts, that provide a hierarchical +configuration configuration with the ability to override values with higher +level charts or command line options. + +The structure of the configuration of ONAP is shown in the following diagram. +Note that key/value pairs of a parent will always take precedence over those +of a child. Also note that values set on the command line have the highest +precedence of all. + +.. graphviz:: + + digraph config { + { + node [shape=folder] + oValues [label="values.yaml"] + demo [label="onap-demo.yaml"] + prod [label="onap-production.yaml"] + oReq [label="requirements.yaml"] + soValues [label="values.yaml"] + soReq [label="requirements.yaml"] + mdValues [label="values.yaml"] + } + { + oResources [label="resources"] + } + onap -> oResources + onap -> oValues + oResources -> environments + oResources -> oReq + oReq -> so + environments -> demo + environments -> prod + so -> soValues + so -> soReq + so -> charts + charts -> mariadb + mariadb -> mdValues + + } + +The top level onap/values.yaml file contains the values required to be set +before deploying ONAP. Here is the contents of this file: + +.. include:: onap_values.yaml + :code: yaml + +One may wish to create a value file that is specific to a given deployment such +that it can be differentiated from other deployments. For example, a +onap-development.yaml file may create a minimal environment for development +while onap-production.yaml might describe a production deployment that operates +independently of the developer version. + +For example, if the production OpenStack instance was different from a +developer's instance, the onap-production.yaml file may contain a different +value for the vnfDeployment/openstack/oam_network_cidr key as shown below. + +.. code-block:: yaml + + nsPrefix: onap + nodePortPrefix: 302 + apps: consul msb mso message-router sdnc vid robot portal policy appc aai + sdc dcaegen2 log cli multicloud clamp vnfsdk aaf kube2msb + dataRootDir: /dockerdata-nfs + + # docker repositories + repository: + onap: nexus3.onap.org:10001 + oom: oomk8s + aai: aaionap + filebeat: docker.elastic.co + + image: + pullPolicy: Never + + # vnf deployment environment + vnfDeployment: + openstack: + ubuntu_14_image: "Ubuntu_14.04.5_LTS" + public_net_id: "e8f51956-00dd-4425-af36-045716781ffc" + oam_network_id: "d4769dfb-c9e4-4f72-b3d6-1d18f4ac4ee6" + oam_subnet_id: "191f7580-acf6-4c2b-8ec0-ba7d99b3bc4e" + oam_network_cidr: "192.168.30.0/24" + <...> + + +To deploy ONAP with this environment file, enter:: + + > helm install local/onap -n beijing -f environments/onap-production.yaml + +.. include:: environments_onap_demo.yaml + :code: yaml + +When deploying all of ONAP a requirements.yaml file control which and what +version of the ONAP components are included. Here is an excerpt of this +file: + +.. code-block:: yaml + + # Referencing a named repo called 'local'. + # Can add this repo by running commands like: + # > helm serve + # > helm repo add local http://127.0.0.1:8879 + dependencies: + <...> + - name: so + version: ~2.0.0 + repository: '@local' + condition: so.enabled + <...> + +The ~ operator in the `so` version value indicates that the latest "2.X.X" +version of `so` shall be used thus allowing the chart to allow for minor +upgrades that don't impact the so API; hence, version 2.0.1 will be installed +in this case. + +The onap/resources/environment/onap-dev.yaml (see the excerpt below) enables +for fine grained control on what components are included as part of this +deployment. By changing this `so` line to `enabled: false` the `so` component +will not be deployed. If this change is part of an upgrade the existing `so` +component will be shut down. Other `so` parameters and even `so` child values +can be modified, for example the `so`'s `liveness` probe could be disabled +(which is not recommended as this change would disable auto-healing of `so`). + +.. code-block:: yaml + + ################################################################# + # Global configuration overrides. + # + # These overrides will affect all helm charts (ie. applications) + # that are listed below and are 'enabled'. + ################################################################# + global: + <...> + + ################################################################# + # Enable/disable and configure helm charts (ie. applications) + # to customize the ONAP deployment. + ################################################################# + aaf: + enabled: false + <...> + so: # Service Orchestrator + enabled: true + + replicaCount: 1 + + liveness: + # necessary to disable liveness probe when setting breakpoints + # in debugger so K8s doesn't restart unresponsive container + enabled: true + + <...> + +.. figure:: oomLogoV2-Monitor.png + :align: right + +Monitor +======= + +All highly available systems include at least one facility to monitor the +health of components within the system. Such health monitors are often used as +inputs to distributed coordination systems (such as etcd, zookeeper, or consul) +and monitoring systems (such as nagios or zabbix). OOM provides two mechanims +to monitor the real-time health of an ONAP deployment: + +- a Consul GUI for a human operator or downstream monitoring systems and + Kubernetes liveness probes that enable automatic healing of failed + containers, and +- a set of liveness probes which feed into the Kubernetes manager which + are described in the Heal section. + +Within ONAP Consul is the monitoring system of choice and deployed by OOM in two parts: + +- a three-way, centralized Consul server cluster is deployed as a highly + available monitor of all of the ONAP components,and +- a number of Consul agents. + +The Consul server provides a user interface that allows a user to graphically +view the current health status of all of the ONAP components for which agents +have been created - a sample from the ONAP Integration labs follows: + +.. figure:: consulHealth.png + :align: center + +To see the real-time health of a deployment go to: http://<kubernetes IP>:30270/ui/ +where a GUI much like the following will be found: + + +.. figure:: oomLogoV2-Heal.png + :align: right + +Heal +==== + +The ONAP deployment is defined by Helm charts as mentioned earlier. These Helm +charts are also used to implement automatic recoverability of ONAP components +when individual components fail. Once ONAP is deployed, a "liveness" probe +starts checking the health of the components after a specified startup time. + +Should a liveness probe indicate a failed container it will be terminated and a +replacement will be started in its place - containers are ephemeral. Should the +deployment specification indicate that there are one or more dependencies to +this container or component (for example a dependency on a database) the +dependency will be satisfied before the replacement container/component is +started. This mechanism ensures that, after a failure, all of the ONAP +components restart successfully. + +To test healing, the following command can be used to delete a pod:: + + > kubectl delete pod [pod name] -n [pod namespace] + +One could then use the following command to monitor the pods and observe the +pod being terminated and the service being automatically healed with the +creation of a replacement pod:: + + > kubectl get pods --all-namespaces -o=wide + +.. figure:: oomLogoV2-Scale.png + :align: right + +Scale +===== + +Many of the ONAP components are horizontally scalable which allows them to +adapt to expected offered load. During the Beijing release scaling is static, +that is during deployment or upgrade a cluster size is defined and this cluster +will be maintained even in the presence of faults. The parameter that controls +the cluster size of a given component is found in the values.yaml file for that +component. Here is an excerpt that shows this parameter: + +.. code-block:: yaml + + # default number of instances + replicaCount: 1 + +In order to change the size of a cluster, an operator could use a helm upgrade +(described in detail in the next section) as follows:: + + > helm upgrade --set replicaCount=3 onap/so/mariadb + +The ONAP components use Kubernetes provided facilities to build clustered, +highly available systems including: Services_ with load-balancers, ReplicaSet_, +and StatefulSet_. Some of the open-source projects used by the ONAP components +directly support clustered configurations, for example ODL and MariaDB Galera. + +The Kubernetes Services_ abstraction to provide a consistent access point for +each of the ONAP components, independent of the pod or container architecture +of that component. For example, SDN-C uses OpenDaylight clustering with a +default cluster size of three but uses a Kubernetes service to and change the +number of pods in this abstract this cluster from the other ONAP components +such that the cluster could change size and this change is isolated from the +other ONAP components by the load-balancer implemented in the ODL service +abstraction. + +A ReplicaSet_ is a construct that is used to describe the desired state of the +cluster. For example 'replicas: 3' indicates to Kubernetes that a cluster of 3 +instances is the desired state. Should one of the members of the cluster fail, +a new member will be automatically started to replace it. + +Some of the ONAP components many need a more deterministic deployment; for +example to enable intra-cluster communication. For these applications the +component can be deployed as a Kubernetes StatefulSet_ which will maintain a +persistent identifier for the pods and thus a stable network id for the pods. +For example: the pod names might be web-0, web-1, web-{N-1} for N 'web' pods +with corresponding DNS entries such that intra service communication is simple +even if the pods are physically distributed across multiple nodes. An example +of how these capabilities can be used is described in the Running Consul on +Kubernetes tutorial. + +.. figure:: oomLogoV2-Upgrade.png + :align: right + +Upgrade +======= + +Helm has built-in capabilities to enable the upgrade of pods without causing a +loss of the service being provided by that pod or pods (if configured as a +cluster). As described in the OOM Developer's Guide, ONAP components provide +an abstracted 'service' end point with the pods or containers providing this +service hidden from other ONAP components by a load balancer. This capability +is used during upgrades to allow a pod with a new image to be added to the +service before removing the pod with the old image. This 'make before break' +capability ensures minimal downtime. + +Prior to doing an upgrade, determine of the status of the deployed charts:: + + > helm list + NAME REVISION UPDATED STATUS CHART NAMESPACE + so 1 Mon Feb 5 10:05:22 2018 DEPLOYED so-2.0.1 default + +When upgrading a cluster a parameter controls the minimum size of the cluster +during the upgrade while another parameter controls the maximum number of nodes +in the cluster. For example, SNDC configured as a 3-way ODL cluster might +require that during the upgrade no fewer than 2 pods are available at all times +to provide service while no more than 5 pods are ever deployed across the two +versions at any one time to avoid depleting the cluster of resources. In this +scenario, the SDNC cluster would start with 3 old pods then Kubernetes may add +a new pod (3 old, 1 new), delete one old (2 old, 1 new), add two new pods (2 +old, 3 new) and finally delete the 2 old pods (3 new). During this sequence +the constraints of the minimum of two pods and maximum of five would be +maintained while providing service the whole time. + +Initiation of an upgrade is triggered by changes in the Helm charts. For +example, if the image specified for one of the pods in the SDNC deployment +specification were to change (i.e. point to a new Docker image in the nexus3 +repository - commonly through the change of a deployment variable), the +sequence of events described in the previous paragraph would be initiated. + +For example, to upgrade a container by changing configuration, specifically an +environment value:: + + > helm upgrade beijing onap/so --version 2.0.1 --set enableDebug=true + +Issuing this command will result in the appropriate container being stopped by +Kubernetes and replaced with a new container with the new environment value. + +To upgrade a component to a new version with a new configuration file enter:: + + > helm upgrade beijing onap/so --version 2.0.2 -f environments/demo.yaml + +To fetch release history enter:: + + > helm history so + REVISION UPDATED STATUS CHART DESCRIPTION + 1 Mon Feb 5 10:05:22 2018 SUPERSEDED so-2.0.1 Install complete + 2 Mon Feb 5 10:10:55 2018 DEPLOYED so-2.0.2 Upgrade complete + +Unfortunately, not all upgrades are successful. In recognition of this the +lineup of pods within an ONAP deployment is tagged such that an administrator +may force the ONAP deployment back to the previously tagged configuration or to +a specific configuration, say to jump back two steps if an incompatibility +between two ONAP components is discovered after the two individual upgrades +succeeded. + +This rollback functionality gives the administrator confidence that in the +unfortunate circumstance of a failed upgrade the system can be rapidly brought +back to a known good state. This process of rolling upgrades while under +service is illustrated in this short YouTube video showing a Zero Downtime +Upgrade of a web application while under a 10 million transaction per second +load. + +For example, to roll-back back to previous system revision enter:: + + > helm rollback so 1 + + > helm history so + REVISION UPDATED STATUS CHART DESCRIPTION + 1 Mon Feb 5 10:05:22 2018 SUPERSEDED so-2.0.1 Install complete + 2 Mon Feb 5 10:10:55 2018 SUPERSEDED so-2.0.2 Upgrade complete + 3 Mon Feb 5 10:14:32 2018 DEPLOYED so-2.0.1 Rollback to 1 + +.. note:: + + The description field can be overridden to document actions taken or include + tracking numbers. + +Many of the ONAP components contain their own databases which are used to +record configuration or state information. The schemas of these databases may +change from version to version in such a way that data stored within the +database needs to be migrated between versions. If such a migration script is +available it can be invoked during the upgrade (or rollback) by Container +Lifecycle Hooks. Two such hooks are available, PostStart and PreStop, which +containers can access by registering a handler against one or both. Note that +it is the responsibility of the ONAP component owners to implement the hook +handlers - which could be a shell script or a call to a specific container HTTP +endpoint - following the guidelines listed on the Kubernetes site. Lifecycle +hooks are not restricted to database migration or even upgrades but can be used +anywhere specific operations need to be taken during lifecycle operations. + +OOM uses Helm K8S package manager to deploy ONAP components. Each component is +arranged in a packaging format called a chart - a collection of files that +describe a set of k8s resources. Helm allows for rolling upgrades of the ONAP +component deployed. To upgrade a component Helm release you will need an +updated Helm chart. The chart might have modified, deleted or added values, +deployment yamls, and more. To get the release name use:: + + > helm ls + +To easily upgrade the release use:: + + > helm upgrade [RELEASE] [CHART] + +To roll back to a previous release version use:: + + > helm rollback [flags] [RELEASE] [REVISION] + +For example, to upgrade the onap-so helm release to the latest SO container +release v1.1.2: + +- Edit so values.yaml which is part of the chart +- Change "so: nexus3.onap.org:10001/openecomp/so:v1.1.1" to + "so: nexus3.onap.org:10001/openecomp/so:v1.1.2" +- From the chart location run:: + + > helm upgrade onap-so + +The previous so pod will be terminated and a new so pod with an updated so +container will be created. + +.. figure:: oomLogoV2-Delete.png + :align: right + +Delete +====== + +Existing deployments can be partially or fully removed once they are no longer +needed. To minimize errors it is recommended that before deleting components +from a running deployment the operator perform a 'dry-run' to display exactly +what will happen with a given command prior to actually deleting anything. For +example:: + + > helm delete --dry-run beijing + +will display the outcome of deleting the 'beijing' release from the deployment. +To completely delete a release and remove it from the internal store enter:: + + > helm delete --purge beijing + +One can also remove individual components from a deployment by changing the +ONAP configuration values. For example, to remove `so` from a running +deployment enter:: + + > helm upgrade beijing osn/onap --set so.enabled=false + +will remove `so` as the configuration indicates it's no longer part of the +deployment. This might be useful if a one wanted to replace just `so` by +installing a custom version. |
