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#!/usr/bin/python
import getopt
import logging
import os
import sys
import time
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)
handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
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))
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:
ready = s.ready
if not ready:
log.info(container_name + " is not ready.")
else:
log.info(container_name + " is ready!")
else:
continue
return ready
except Exception as e:
log.error("Exception when calling list_namespaced_pod: %s\n" % e)
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:
time.sleep(5)
if __name__ == "__main__":
main(sys.argv[1:])
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