Monitoring scripts for docker containers.

check_docker_container.sh

#!/bin/bash

# Author: Haukur Kristinsson / Erik Kristensen
# Email: haukur@hauxi.is / erik@erikkristensen.com
# License: MIT
# Nagios Usage: check_nrpe!check_docker_container!_container_id_
# Usage: ./check_docker_container.sh _container_id_
#
# The script checks if a container is running.
#   OK - running
#   WARNING - container is ghosted
#   CRITICAL - container is stopped
#   UNKNOWN - does not exist

CONTAINER=$1

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
 
STARTED=$(docker inspect --format="{{ .State.StartedAt }}" $CONTAINER)
NAME=$(docker inspect --format="{{ .Name }}" $CONTAINER)
NETWORKMODE=$(docker inspect --format="{{ .HostConfig.NetworkMode }}" $CONTAINER)
NETWORK=$(docker inspect --format="{{ .NetworkSettings.Networks."$NETWORKMODE".IPAddress }}" $CONTAINER)

echo "OK - $CONTAINER is running. IP: $NETWORK, StartedAt: $STARTED, Named: $NAME"