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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

config.load_kube_config()

c = Configuration()

c.assert_hostname = False

Configuration.set_default(c)

api = core_v1_api.CoreV1Api()

name = 'busybox-test'

resp = None

try:

resp = api.read_namespaced_pod(name=name,

namespace='default')

except ApiException as e:

if e.status != 404:

print("Unknown error: %s" % e)

exit(1)

if not resp:

print("Pod %s does not exits. Creating it..." % name)

pod_manifest = {

'apiVersion': 'v1',

'kind': 'Pod',

'metadata': {

'name': name

},

'spec': {

'containers': [{

'image': 'busybox',

'name': 'sleep',

"args": [

"/bin/sh",

"-c",

"while true;do date;sleep 5; done"

]

}]

}

}

resp = api.create_namespaced_pod(body=pod_manifest,

namespace='default')

while True:

resp = api.read_namespaced_pod(name=name,

namespace='default')

if resp.status.phase != 'Pending':

break

time.sleep(1)

print("Done.")

# calling exec and wait for response.

exec_command = [

'/bin/sh',

'-c',

'echo This message goes to stderr >&2; echo This message goes to stdout']

resp = stream(api.connect_get_namespaced_pod_exec, name, 'default',

command=exec_command,

stderr=True, stdin=False,

stdout=True, tty=False)

print("Response: " + resp)

# Calling exec interactively.

exec_command = ['/bin/sh']

resp = stream(api.connect_get_namespaced_pod_exec, name, 'default',

command=exec_command,

stderr=True, stdin=True,

stdout=True, tty=False,

_preload_content=False)

commands = [

"echo test1",

"echo \"This message goes to stderr\" >&2",

]

while resp.is_open():

resp.update(timeout=1)

if resp.peek_stdout():

print("STDOUT: %s" % resp.read_stdout())

if resp.peek_stderr():

print("STDERR: %s" % resp.read_stderr())

if commands:

c = commands.pop(0)

print("Running command... %s\n" % c)

resp.write_stdin(c + "\n")

else:

break

resp.write_stdin("date\n")

sdate = resp.readline_stdout(timeout=3)

print("Server date command returns: %s" % sdate)

resp.write_stdin("whoami\n")

user = resp.readline_stdout(timeout=3)

print("Server user is: %s" % user)

resp.close()