diff options
Diffstat (limited to 'kubernetes/readiness/src/main/scripts/ready.py')
| -rw-r--r-- | kubernetes/readiness/src/main/scripts/ready.py | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/kubernetes/readiness/src/main/scripts/ready.py b/kubernetes/readiness/src/main/scripts/ready.py new file mode 100644 index 0000000000..3f76d10395 --- /dev/null +++ b/kubernetes/readiness/src/main/scripts/ready.py @@ -0,0 +1,189 @@ +#!/usr/bin/env python +import getopt +import logging +import os +import sys +import time +import random + +from kubernetes import client + +# extract env variables. +namespace = os.environ['NAMESPACE'] +cert = os.environ['CERT'] +host = os.environ['KUBERNETES_SERVICE_HOST'] +token_path = os.environ['TOKEN'] + +with open(token_path, 'r') as token_file: + token = token_file.read().replace('\n', '') + +# setup logging +log = logging.getLogger(__name__) +handler = logging.StreamHandler(sys.stdout) +formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s') +handler.setFormatter(formatter) +handler.setLevel(logging.INFO) +log.addHandler(handler) +log.setLevel(logging.INFO) + +configuration = client.Configuration() +configuration.host = "https://" + host +configuration.ssl_ca_cert = cert +configuration.api_key['authorization'] = token +configuration.api_key_prefix['authorization'] = 'Bearer' +coreV1Api = client.CoreV1Api(client.ApiClient(configuration)) +api_instance = client.ExtensionsV1beta1Api(client.ApiClient(configuration)) +api = client.AppsV1beta1Api(client.ApiClient(configuration)) +batchV1Api = client.BatchV1Api(client.ApiClient(configuration)) + + +def is_job_complete(job_name): + complete = False + log.info("Checking if " + job_name + " is complete") + try: + response = batchV1Api.read_namespaced_job_status(job_name, namespace) + if response.status.succeeded == 1: + job_status_type = response.status.conditions[0].type + if job_status_type == "Complete": + complete = True + log.info(job_name + " is complete") + else: + log.info(job_name + " is not complete") + else: + log.info(job_name + " has not succeeded yet") + return complete + except Exception as e: + log.error("Exception when calling read_namespaced_job_status: %s\n" % e) + + +def wait_for_statefulset_complete(statefulset_name): + try: + response = api.read_namespaced_stateful_set(statefulset_name, namespace) + s = response.status + if (s.updated_replicas == response.spec.replicas and + s.replicas == response.spec.replicas and + s.ready_replicas == response.spec.replicas and + s.current_replicas == response.spec.replicas and + s.observed_generation == response.metadata.generation): + log.info("Statefulset " + statefulset_name + " is ready") + return True + else: + log.info("Statefulset " + statefulset_name + " is not ready") + return False + except Exception as e: + log.error("Exception when waiting for Statefulset status: %s\n" % e) + + +def wait_for_deployment_complete(deployment_name): + try: + response = api.read_namespaced_deployment(deployment_name, namespace) + s = response.status + if (s.unavailable_replicas is None and + ( s.updated_replicas is None or s.updated_replicas == response.spec.replicas ) and + s.replicas == response.spec.replicas and + s.ready_replicas == response.spec.replicas and + s.observed_generation == response.metadata.generation): + log.info("Deployment " + deployment_name + " is ready") + return True + else: + log.info("Deployment " + deployment_name + " is not ready") + return False + except Exception as e: + log.error("Exception when waiting for deployment status: %s\n" % e) + + +def is_ready(container_name): + ready = False + log.info("Checking if " + container_name + " is ready") + try: + response = coreV1Api.list_namespaced_pod(namespace=namespace, + watch=False) + for i in response.items: + # container_statuses can be None, which is non-iterable. + if i.status.container_statuses is None: + continue + for s in i.status.container_statuses: + if s.name == container_name: + name = read_name(i) + if i.metadata.owner_references[0].kind == "StatefulSet": + ready = wait_for_statefulset_complete(name) + elif i.metadata.owner_references[0].kind == "ReplicaSet": + deployment_name = get_deployment_name(name) + ready = wait_for_deployment_complete(deployment_name) + elif i.metadata.owner_references[0].kind == "Job": + ready = is_job_complete(name) + + return ready + + else: + continue + return ready + except Exception as e: + log.error("Exception when calling list_namespaced_pod: %s\n" % e) + + +def read_name(item): + return item.metadata.owner_reference[0].name + + +def get_deployment_name(replicaset): + api_response = api_instance.read_namespaced_replica_set_status(replicaset, + namespace) + deployment_name = read_name(api_response) + return deployment_name + + +DEF_TIMEOUT = 10 +DESCRIPTION = "Kubernetes container readiness check utility" +USAGE = "Usage: ready.py [-t <timeout>] -c <container_name> " \ + "[-c <container_name> ...]\n" \ + "where\n" \ + "<timeout> - wait for container readiness timeout in min, " \ + "default is " + str(DEF_TIMEOUT) + "\n" \ + "<container_name> - name of the container to wait for\n" + + +def main(argv): + # args are a list of container names + container_names = [] + timeout = DEF_TIMEOUT + try: + opts, args = getopt.getopt(argv, "hc:t:", ["container-name=", + "timeout=", + "help"]) + for opt, arg in opts: + if opt in ("-h", "--help"): + print("%s\n\n%s" % (DESCRIPTION, USAGE)) + sys.exit() + elif opt in ("-c", "--container-name"): + container_names.append(arg) + elif opt in ("-t", "--timeout"): + timeout = float(arg) + except (getopt.GetoptError, ValueError) as e: + print("Error parsing input parameters: %s\n" % e) + print(USAGE) + sys.exit(2) + if container_names.__len__() == 0: + print("Missing required input parameter(s)\n") + print(USAGE) + sys.exit(2) + + for container_name in container_names: + timeout = time.time() + timeout * 60 + while True: + ready = is_ready(container_name) + if ready is True: + break + elif time.time() > timeout: + log.warning("timed out waiting for '" + container_name + + "' to be ready") + exit(1) + else: + # spread in time potentially parallel execution in multiple + # containers + time.sleep(random.randint(5, 11)) + + +if __name__ == "__main__": + main(sys.argv[1:]) + |