#!/bin/bash

if [ -x /usr/bin/docker ] ; then
    echo "<<<check_docker>>>"
    for i in $(docker inspect --format='{{.Name}};{{.State.Running}};{{.Image}}' $(docker ps -a -q --no-trunc) | cut -c2-)
    do
        name=$(echo $i | cut -f1 -d';')
        state=$(echo $i | cut -f2 -d';')
        image=$(echo $i | cut -f3 -d';')
        imageid=$(echo $image | cut -f2 -d':' | cut -c1-12)
        imagename=$(docker image ls | grep $imageid | awk '{print $1}' | uniq)
        if [ "$state" == "true" ]
        then
            if [ "$imagename" == "<none>" ]
            then
                echo "1 container_$name - WARN - container $name is running with image $imageid ((!)$imagename) = update is needed"
            else
                echo "0 container_$name - OK - container $name is running with image $imageid ($imagename)"
            fi
        else
            echo "2 container_$name - CRIT - container $name is not running"
        fi
    done
fi