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Use su to execute podman commands #9

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Use su to execute podman commands #9

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83 changes: 47 additions & 36 deletions check_container_stats_podman.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
"""

import os
from shlex import split
import sys
import subprocess
from re import findall, match
Expand All @@ -25,11 +26,15 @@
def get_args():
""" Parse Arguments """
parser = ArgumentParser(
description="Icinga/Nagios plugin which checks health and statistics of a \
description="Icinga/Nagios plugin which checks health and statistics of a \
Container")
parser.add_argument("-c", "--container", required=True,
help="Name of the Container which should be checked",
type=str, dest='container_name')
parser.add_argument("-u", "--user", required=False,
help="User for rootless containers, default: root",
default='root',
type=str, dest='user')
parser.add_argument("-t", "--timeout", required=False,
help="timeout in seconds", type=int, dest='timeout',
default=10)
Expand Down Expand Up @@ -72,22 +77,24 @@ def exit_plugin(returncode, output, perfdata):
sys.exit(0)


def get_container_pslist(args, docker_env):
""" execute docker ps"""
def get_container_pslist(args, podman_env):
""" execute podman ps"""

# Execute "docker ps" command
result = subprocess.run(['podman', 'ps', '-a', '-f', f'name=^{args.container_name}$',
'--format', '"{{.Names}},{{.Status}},{{.Size}},{{.RunningFor}}"',
'--size'],
shell=False,
check=False,
env=docker_env,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
# Execute "podman ps" command
result = subprocess.run(
split((f'su - {args.user} /bin/bash -c "podman ps -a'
f' -f name=^{args.container_name}$ --format'
' {{.Names}},{{.Status}},{{.Size}},{{.RunningFor}}'
' --size"')),
shell=False,
check=False,
env=podman_env,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)

# Check if command exited without error code
if result.returncode != 0:
exit_plugin(3, f'docker stats command returned error: {result.stderr}', '')
exit_plugin(3, f'podman ps command returned error: {result.stderr}', '')

# Check if the command returned any putput
elif len(result.stdout.decode()) == 0:
Expand All @@ -111,26 +118,28 @@ def get_container_pslist(args, docker_env):
return container_ps


def get_container_stats(args, docker_env):
""" execute docker stat"""
def get_container_stats(args, podman_env):
""" execute podman stats"""

# Execute "docker stats" command
result = subprocess.run(['podman', 'stats', args.container_name, '--no-stream', '--format',
'"{{.Name}},{{.ID}},{{.CPUPerc}},{{.MemUsage}},\
{{.NetIO}},{{.BlockIO}},{{.PIDs}}"'],
shell=False,
check=False,
env=docker_env,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
# Execute "podman stats" command
result = subprocess.run(
split((f'su - {args.user} /bin/bash -c "'
f' podman stats {args.container_name} --no-stream --format'
' {{.Name}},{{.ID}},{{.CPUPerc}},{{.MemUsage}},'
' {{.NetIO}},{{.BlockIO}},{{.PIDs}}"')),
shell=False,
check=False,
env=podman_env,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)

# Check if command exited without error code
if result.returncode != 0:
exit_plugin(3, f'docker stats command returned error: {result.stderr}', '')
exit_plugin(3, f'podman stats command returned error: {result.stderr}', '')

# Check if the command returned any putput
elif len(result.stdout.decode()) == 0:
exit_plugin(2, (f'docker stats did not return any output for '
exit_plugin(2, (f'podman stats did not return any output for '
f'Container {args.container_name}'), '')

# Initialize return object
Expand Down Expand Up @@ -166,7 +175,7 @@ def get_container_stats(args, docker_env):


def convert_to_bytes(inputstr):
""" converts docker output units to raw bytes """
""" converts podman output units to raw bytes """

if inputstr == "--":
# If the container does not bind any ports podman returns "-- / --" as
Expand Down Expand Up @@ -208,12 +217,12 @@ def main():
# Get Arguments
args = get_args()

# environment variables for "docker" command
docker_env = os.environ
# environment variables for "podman" command
podman_env = os.environ

# Execute "docker ps" and "docker stats"
container_ps = get_container_pslist(args, docker_env)
container_stats = get_container_stats(args, docker_env)
# Execute "podman ps" and "podman stats"
container_ps = get_container_pslist(args, podman_env)
container_stats = get_container_stats(args, podman_env)

# Construct perfdata and output
output = (f"{container_stats['name']} ({container_stats['id']}) is {container_ps['state']} - "
Expand All @@ -238,16 +247,18 @@ def main():
returncode = 1
if args.cpucrit is not None and args.cpucrit < container_stats['cpu_perc']:
returncode = 2
if args.cpuwarn is not None and args.cpuwarn < container_stats['cpu_perc'] and returncode != 2:
if (args.cpuwarn is not None and args.cpuwarn < container_stats['cpu_perc']
and returncode != 2):
returncode = 1
if args.memcrit is not None and args.memcrit < container_stats['mem_used_byte']:
returncode = 2
if args.memwarn is not None and args.memwarn < container_stats['mem_used_byte'] \
and returncode != 2:
if (args.memwarn is not None and args.memwarn < container_stats['mem_used_byte']
and returncode != 2):
returncode = 1
if args.pidcrit is not None and args.pidcrit < container_stats['pids']:
returncode = 2
if args.pidwarn is not None and args.pidwarn < container_stats['pids'] and returncode != 2:
if (args.pidwarn is not None and args.pidwarn < container_stats['pids']
and returncode != 2):
returncode = 1

exit_plugin(returncode, output, perfdata)
Expand Down