path: root/docs/sections/guides/infra_guides/oom_infra_base_config_setup.rst

.. This work is licensed under a Creative Commons Attribution 4.0
.. International License.
.. http://creativecommons.org/licenses/by/4.0
.. Copyright (C) 2022 Nordix Foundation

.. Links
.. _HELM Best Practices Guide: https://docs.helm.sh/chart_best_practices/#requirements
.. _helm installation guide: https://helm.sh/docs/intro/install/
.. _kubectl installation guide: https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
.. _Curated applications for Kubernetes: https://github.com/kubernetes/charts
.. _Cert-Manager Installation documentation: https://cert-manager.io/docs/installation/kubernetes/
.. _Cert-Manager kubectl plugin documentation: https://cert-manager.io/docs/usage/kubectl-plugin/
.. _Strimzi Apache Kafka Operator helm Installation documentation: https://strimzi.io/docs/operators/in-development/deploying.html#deploying-cluster-operator-helm-chart-str
.. _ONAP Next Generation Security & Logging Structure: https://wiki.onap.org/pages/viewpage.action?pageId=103417456
.. _Istio setup guide: https://istio.io/latest/docs/setup/install/helm/
.. _Gateway-API: https://gateway-api.sigs.k8s.io/
.. _Istio-Gateway: https://istio.io/latest/docs/reference/config/networking/gateway/
.. _DefaultStorageClass: https://kubernetes.io/docs/tasks/administer-cluster/change-default-storage-class/

.. _oom_base_setup_guide:

OOM Base Platform
=================

As part of the initial base setup of the host Kubernetes cluster,
the following mandatory installation and configuration steps must be completed.

.. contents::
   :backlinks: top
   :depth: 1
   :local:
..

For additional platform add-ons, see the :ref:`oom_base_optional_addons` section.

Install & configure kubectl
---------------------------

The Kubernetes command line interface used to manage a Kubernetes cluster needs to be installed
and configured to run as non root.

For additional information regarding kubectl installation and configuration see the `kubectl installation guide`_

To install kubectl, execute the following, replacing the <recommended-kubectl-version> with the version defined
in the :ref:`versions_table` table::

    > curl -LO https://dl.k8s.io/release/v<recommended-kubectl-version>/bin/linux/amd64/kubectl

    > chmod +x ./kubectl

    > sudo mv ./kubectl /usr/local/bin/kubectl

    > mkdir ~/.kube

    > cp kube_config_cluster.yml ~/.kube/config.onap

    > export KUBECONFIG=~/.kube/config.onap

    > kubectl config use-context onap

Validate the installation::

    > kubectl get nodes

::

  NAME             STATUS   ROLES               AGE     VERSION
  onap-control-1   Ready    controlplane,etcd   3h53m   v1.23.8
  onap-control-2   Ready    controlplane,etcd   3h53m   v1.23.8
  onap-k8s-1       Ready    worker              3h53m   v1.23.8
  onap-k8s-2       Ready    worker              3h53m   v1.23.8
  onap-k8s-3       Ready    worker              3h53m   v1.23.8
  onap-k8s-4       Ready    worker              3h53m   v1.23.8
  onap-k8s-5       Ready    worker              3h53m   v1.23.8
  onap-k8s-6       Ready    worker              3h53m   v1.23.8


Install & configure helm
------------------------

Helm is used for package and configuration management of the relevant helm charts.
For additional information, see the `helm installation guide`_

To install helm, execute the following, replacing the <recommended-helm-version> with the version defined
in the :ref:`versions_table` table::

    > wget https://get.helm.sh/helm-v<recommended-helm-version>-linux-amd64.tar.gz

    > tar -zxvf helm-v<recommended-helm-version>-linux-amd64.tar.gz

    > sudo mv linux-amd64/helm /usr/local/bin/helm

Verify the helm version with::

    > helm version

Helm's default CNCF provided `Curated applications for Kubernetes`_ repository called
*stable* can be removed to avoid confusion::

    > helm repo remove stable

Install the additional OOM plugins required to un/deploy the OOM helm charts::

    > git clone http://gerrit.onap.org/r/oom

    > helm plugin install ~/oom/kubernetes/helm/plugins/deploy

    > helm plugin install ~/oom/kubernetes/helm/plugins/undeploy

Verify the plugins are installed::

    > helm plugin ls

::

    NAME        VERSION   DESCRIPTION
    deploy      1.0.0     install (upgrade if release exists) parent chart and all subcharts as separate but related releases
    undeploy    1.0.0     delete parent chart and subcharts that were deployed as separate releases

Set the default StorageClass
----------------------------

In some ONAP components it is important to have a default storageClass defined (e.g. cassandra),
if you don't want to explicitly set it during the deployment via helm overrides.

Therefor you should set the default storageClass (if not done during the K8S cluster setup) via the command::

    > kubectl patch storageclass <storageclass> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

see `DefaultStorageClass`_

Install the Strimzi Kafka Operator
----------------------------------

Strimzi Apache Kafka provides a way to run an Apache Kafka cluster on Kubernetes
in various deployment configurations by using kubernetes operators.
Operators are a method of packaging, deploying, and managing Kubernetes applications.

Strimzi Operators extend the Kubernetes functionality, automating common
and complex tasks related to a Kafka deployment. By implementing
knowledge of Kafka operations in code, the Kafka administration
tasks are simplified and require less manual intervention.

The Strimzi cluster operator is deployed using helm to install the parent chart
containing all of the required custom resource definitions. This should be done
by a kubernetes administrator to allow for deployment of custom resources in to
any kubernetes namespace within the cluster.

Full installation instructions can be found in the
`Strimzi Apache Kafka Operator helm Installation documentation`_.

To add the required helm repository, execute the following::

    > helm repo add strimzi https://strimzi.io/charts/

To install the strimzi kafka operator, execute the following, replacing the <recommended-strimzi-version> with the version defined
in the :ref:`versions_table` table::

    > helm install strimzi-kafka-operator strimzi/strimzi-kafka-operator --namespace strimzi-system --version <recommended-strimzi-version> --set watchAnyNamespace=true --create-namespace

Verify the installation::

    > kubectl get po -n strimzi-system

::

    NAME                                        READY   STATUS    RESTARTS       AGE
    strimzi-cluster-operator-7f7d6b46cf-mnpjr   1/1     Running   0              2m


.. _oom_base_setup_cert_manager:

Install Cert-Manager
--------------------

Cert-Manager is a native Kubernetes certificate management controller.
It can help with issuing certificates from a variety of sources, such as
Let’s Encrypt, HashiCorp Vault, Venafi, a simple signing key pair, self
signed or external issuers. It ensures certificates are valid and up to
date, and attempt to renew certificates at a configured time before expiry.

Cert-Manager is deployed using regular YAML manifests which include all
the needed resources (the CustomResourceDefinitions, cert-manager,
namespace, and the webhook component).

Full installation instructions, including details on how to configure extra
functionality in Cert-Manager can be found in the
`Cert-Manager Installation documentation`_.

There is also a kubectl plugin (kubectl cert-manager) that can help you
to manage cert-manager resources inside your cluster. For installation
steps, please refer to `Cert-Manager kubectl plugin documentation`_.


To install cert-manager, execute the following, replacing the <recommended-cm-version> with the version defined
in the :ref:`versions_table` table::

    > kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v<recommended-cm-version>/cert-manager.yaml

Verify the installation::

    > kubectl get po -n cert-manager

::

    NAME                                       READY   STATUS    RESTARTS      AGE
    cert-manager-776c4cfcb6-vgnpw              1/1     Running   0             2m
    cert-manager-cainjector-7d9668978d-hdxf7   1/1     Running   0             2m
    cert-manager-webhook-66c8f6c75-dxmtz       1/1     Running   0             2m

Istio Service Mesh
------------------

.. note::
    In London ONAP deployment supports the
    `ONAP Next Generation Security & Logging Structure`_

ONAP is currenty supporting Istio as default ServiceMesh platform.
Therefor the following instructions describe the setup of Istio and required tools.
Used `Istio setup guide`_

.. _oom_base_optional_addons_istio_installation:

Istio Platform Installation
^^^^^^^^^^^^^^^^^^^^^^^^^^^

Install Istio Basic Platform
""""""""""""""""""""""""""""

- Configure the Helm repository::

    > helm repo add istio https://istio-release.storage.googleapis.com/charts

    > helm repo update

- Create a namespace for "mesh-level" configurations::

    > kubectl create namespace istio-config

- Create a namespace istio-system for Istio components::

    > kubectl create namespace istio-system

- Install the Istio Base chart which contains cluster-wide resources used by the
  Istio control plane, replacing the <recommended-istio-version> with the version
  defined in the :ref:`versions_table` table::

    > helm upgrade -i istio-base istio/base -n istio-system --version <recommended-istio-version>

- Create an override for istiod (e.g. istiod.yaml) to add the oauth2-proxy as external
  authentication provider and apply some specific config settings

    .. collapse:: istiod.yaml

      .. include:: ../../resources/yaml/istiod.yaml
         :code: yaml

- Install the Istio Base Istio Discovery chart which deploys the istiod service, replacing the
  <recommended-istio-version> with the version defined in the :ref:`versions_table` table::

    > helm upgrade -i istiod istio/istiod -n istio-system --version <recommended-istio-version>
    --wait -f ./istiod.yaml

Add an EnvoyFilter for HTTP header case
"""""""""""""""""""""""""""""""""""""""

When handling HTTP/1.1, Envoy will normalize the header keys to be all
lowercase. While this is compliant with the HTTP/1.1 spec, in practice this
can result in issues when migrating existing systems that might rely on
specific header casing. In our case a problem was detected in the SDC client
implementation, which relies on uppercase header values. To solve this problem
in general we add a EnvoyFilter to keep the uppercase header in the
istio-config namespace to apply for all namespaces, but set the context to
SIDECAR_INBOUND to avoid problems in the connection between Istio-Gateway and
Services

- Create a EnvoyFilter file (e.g. envoyfilter-case.yaml)

    .. collapse:: envoyfilter-case.yaml

      .. include:: ../../resources/yaml/envoyfilter-case.yaml
         :code: yaml

- Apply the change to Istio::

    > kubectl apply -f envoyfilter-case.yaml


Ingress Controller Installation
-------------------------------

In the production setup 2 different Ingress setups are supported.

- Istio Gateway `Istio-Gateway`_ (currently tested, but in the future deprecated)
- Gateway API `Gateway-API`_ (in Alpha status, but will be standard in the future)

Depending on the solution, the ONAP helm values.yaml has to be configured.
See the :ref:`OOM customized deployment<oom_customize_overrides>` section for more details.

Istio Gateway
^^^^^^^^^^^^^

- Create a namespace istio-ingress for the Istio Ingress gateway
  and enable istio-injection::

    > kubectl create namespace istio-ingress

    > kubectl label namespace istio-ingress istio-injection=enabled

- To expose additional ports besides HTTP/S (e.g. for external Kafka access, SDNC-callhome)
  create an override file (e.g. istio-ingress.yaml)

    .. collapse:: istio-ingress.yaml

      .. include:: ../../resources/yaml/istio-ingress.yaml
         :code: yaml

- Install the Istio Gateway chart using the override file, replacing the
  <recommended-istio-version> with the version defined in
  the :ref:`versions_table` table::

    > helm upgrade -i istio-ingress istio/gateway -n istio-ingress
    --version <recommended-istio-version> -f ingress-istio.yaml --wait


Gateway-API
^^^^^^^^^^^

- Install the Gateway-API CRDs replacing the
  <recommended-gwapi-version> with the version defined in
  the :ref:`versions_table` table::

    > kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/<recommended-gwapi-version>/experimental-install.yaml

- Create a common Gateway instance
  TBD

Keycloak Installation
---------------------

- Add helm repositories::

  > helm repo add bitnami https://charts.bitnami.com/bitnami

  > helm repo add codecentric https://codecentric.github.io/helm-charts

  > helm repo update

- create keycloak namespace::

  > kubectl create namespace keycloak
  > kubectl label namespace keycloak istio-injection=enabled

Install Keycloak-Database
^^^^^^^^^^^^^^^^^^^^^^^^^

- To configure the Postgres DB
  create an override file (e.g. keycloak-db-values.yaml)

    .. collapse:: keycloak-db-values.yaml

      .. include:: ../../resources/yaml/keycloak-db-values.yaml
         :code: yaml

- Install the Postgres DB::

  > helm -n keycloak upgrade -i keycloak-db bitnami/postgresql --values ./keycloak-db-values.yaml

Configure Keycloak
^^^^^^^^^^^^^^^^^^

- To configure the Keycloak instance
  create an override file (e.g. keycloak-server-values.yaml)

    .. collapse:: keycloak-server-values.yaml

      .. include:: ../../resources/yaml/keycloak-server-values.yaml
         :code: yaml

- Install keycloak::

  > helm -n keycloak upgrade -i keycloak codecentric/keycloak --values ./keycloak-server-values.yaml

The required Ingress entry and REALM will be provided by the ONAP "Platform"
component.