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#!/usr/bin/python
import getopt
import logging
import os
import sys
import time
from kubernetes import config
from kubernetes.client import Configuration
from kubernetes.client.apis import core_v1_api
from kubernetes.client.rest import ApiException
from kubernetes.stream import stream
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'
configuration.assert_hostname = False
coreV1Api = client.CoreV1Api(client.ApiClient(configuration))
api_instance = client.CoreV1Api(client.ApiClient(configuration))
def run_command( pod_name, command ):
try:
exec_command = [
'/bin/sh',
'-c',
command]
resp = stream(api_instance.connect_get_namespaced_pod_exec, pod_name, namespace,
command=exec_command,
stderr=True, stdin=False,
stdout=True, tty=False)
except ApiException as e:
print("Exception when calling CoreV1Api->connect_get_namespaced_pod_exec: %s\n" % e)
return False
print(resp)
return True
def find_pod(container_name,command,pods):
ready = False
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:
if pods == True:
print (i.metadata.name)
else:
ready = run_command(i.metadata.name,command)
else:
continue
except Exception as e:
log.error("Exception when calling list_namespaced_pod: %s\n" % e)
return ready
DESCRIPTION = "Kubernetes container readiness check utility"
USAGE = "Usage: ready.py [-t <timeout>] -c <container_name> [-c <container_name> ...]\n" \
"where\n" \
"<container_name> - name of the container to wait for\n"
def main(argv):
pods = False
command = ""
container_name = ""
try:
opts, args = getopt.getopt(argv, "ghp:c:", ["pod-container-name=", "command=", "help","getpods"])
for opt, arg in opts:
if opt in ("-h", "--help"):
print("%s\n\n%s" % (DESCRIPTION, USAGE))
sys.exit()
elif opt in ("-p", "--pod-container-name"):
container_name = arg
elif opt in ("-c", "--command"):
command = arg
elif opt in ("-g", "--getpods"):
pods = True
except (getopt.GetoptError, ValueError) as e:
print("Error parsing input parameters: %s\n" % e)
print(USAGE)
sys.exit(2)
if container_name.__len__() == 0:
print("Missing required input parameter(s)\n")
print(USAGE)
sys.exit(2)
if pods == False:
if command.__len__() == 0:
print("Missing required input parameter(s)\n")
print(USAGE)
sys.exit(2)
ready = find_pod(container_name,command,pods)
if ready == False:
sys.exit(2)
if __name__ == "__main__":
main(sys.argv[1:])
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