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Bash Script for Nagios to Check Status of Docker Container
#!/bin/bash
# Author: Erik Kristensen
# Email: erik@erikkristensen.com
# License: MIT
# Nagios Usage: check_nrpe!check_docker_container!_container_id_
# Usage: ./check_docker_container.sh _container_id_
#
# Depending on your docker configuration, root might be required. If your nrpe user has rights
# to talk to the docker daemon, then root is not required. This is why root privileges are not
# checked.
#
# The script checks if a container is running.
# OK - running
# WARNING - restarting
# CRITICAL - stopped
# UNKNOWN - does not exist
#
# CHANGELOG - March 20, 2017
# - Removes Ghost State Check, Checks for Restarting State, Properly finds the Networking IP addresses
# - Returns unknown (exit code 3) if docker binary is missing, unable to talk to the daemon, or if container id is missing
CONTAINER=$1
if [ "x${CONTAINER}" == "x" ]; then
echo "UNKNOWN - Container ID or Friendly Name Required"
exit 3
fi
if [ "x$(which docker)" == "x" ]; then
echo "UNKNOWN - Missing docker binary"
exit 3
fi
docker info > /dev/null 2>&1
if [ $? -ne 0 ]; then
echo "UNKNOWN - Unable to talk to the docker daemon"
exit 3
fi
RUNNING=$(docker inspect --format="{{.State.Running}}" $CONTAINER 2> /dev/null)
if [ $? -eq 1 ]; then
echo "UNKNOWN - $CONTAINER does not exist."
exit 3
fi
if [ "$RUNNING" == "false" ]; then
echo "CRITICAL - $CONTAINER is not running."
exit 2
fi
RESTARTING=$(docker inspect --format="{{.State.Restarting}}" $CONTAINER)
if [ "$RESTARTING" == "true" ]; then
echo "WARNING - $CONTAINER state is restarting."
exit 1
fi
STARTED=$(docker inspect --format="{{.State.StartedAt}}" $CONTAINER)
NETWORK=$(docker inspect --format="{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}" $CONTAINER)
echo "OK - $CONTAINER is running. IP: $NETWORK, StartedAt: $STARTED"
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