kubernetes/readiness/docker/init/ready.py

   1 #!/usr/bin/python
   2 from kubernetes import client, config
   3 import time, argparse, logging, sys, os
   4
   5 #extract env variables.
   6 namespace = os.environ['NAMESPACE']
   7 cert = os.environ['CERT']
   8 host = os.environ['KUBERNETES_SERVICE_HOST']
   9 token_path = os.environ['TOKEN']
  10
  11 with open(token_path, 'r') as token_file:
  12     token = token_file.read().replace('\n', '')
  13
  14 client.configuration.host = "https://" + host
  15 client.configuration.ssl_ca_cert = cert
  16 client.configuration.api_key['authorization'] = token
  17 client.configuration.api_key_prefix['authorization'] = 'Bearer'
  18
  19 #setup logging
  20 log = logging.getLogger(__name__)
  21 handler = logging.StreamHandler(sys.stdout)
  22 handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
  23 handler.setLevel(logging.INFO)
  24 log.addHandler(handler)
  25 log.setLevel(logging.INFO)
  26
  27
  28 def is_ready(container_name):
  29     log.info( "Checking if " + container_name + "  is ready")
  30     # config.load_kube_config() # for local testing
  31     # namespace='onap-sdc' # for local testing
  32     v1 = client.CoreV1Api()
  33
  34     ready = False
  35
  36     try:
  37         response = v1.list_namespaced_pod(namespace=namespace, watch=False)
  38         for i in response.items:
  39             for s in i.status.container_statuses:
  40                 if s.name == container_name:
  41                     ready = s.ready
  42                     if not ready:
  43                         log.info( container_name + " is not ready.")
  44                     else:
  45                         log.info( container_name + " is ready!")
  46                 else:
  47                     continue
  48         return ready
  49     except Exception as e:
  50         log.error("Exception when calling list_namespaced_pod: %s\n" % e)
  51
  52
  53 def main(args):
  54     # args are a list of container names
  55     for container_name in args:
  56         # 5 min, TODO: make configurable
  57         timeout = time.time() + 60 * 10
  58         while True:
  59             ready = is_ready(container_name)
  60             if ready is True:
  61                 break
  62             elif time.time() > timeout:
  63                 log.warning( "timed out waiting for '" + container_name + "' to be ready")
  64                 exit(1)
  65             else:
  66                 time.sleep(5)
  67
  68
  69 if __name__ == "__main__":
  70     parser = argparse.ArgumentParser(description='Process some names.')
  71     parser.add_argument('--container-name', action='append', required=True, help='A container name')
  72     args = parser.parse_args()
  73     arg_dict = vars(args)
  74
  75     for arg in arg_dict.itervalues():
  76         main(arg)