Docker - check private registry image version

docker deployment docker-registry
Programster picture Programster · Jun 25, 2014 · Viewed 21.1k times · Source

What CLI commands do I need to use in order to check if the image in my private docker registry is a newer version than the one currently running on my server?

E.g. I have a container that I ran using docker run -d my.domain.com:5000/project1

and I would like to know if it is out-of-date.

Answer

Programster picture Programster · Jun 25, 2014

Brownie points to @mbarthelemy and @amuino who put me on track. From that I was able to come up with the following bash script that others may find useful. It just checks if the tag on the registry is different from the currently executing container.

#!/bin/bash
# ensure running bash
if ! [ -n "$BASH_VERSION" ];then
    echo "this is not bash, calling self with bash....";
    SCRIPT=$(readlink -f "$0")
    /bin/bash $SCRIPT
    exit;
fi


REGISTRY="my.registry.com:5000"
REPOSITORY="awesome-project-of-awesomeness"


LATEST="`wget -qO- http://$REGISTRY/v1/repositories/$REPOSITORY/tags`"
LATEST=`echo $LATEST | sed "s/{//g" | sed "s/}//g" | sed "s/\"//g" | cut -d ' ' -f2`

RUNNING=`docker inspect "$REGISTRY/$REPOSITORY" | grep Id | sed "s/\"//g" | sed "s/,//g" |  tr -s ' ' | cut -d ' ' -f3`

if [ "$RUNNING" == "$LATEST" ];then
    echo "same, do nothing"
else
    echo "update!"
    echo "$RUNNING != $LATEST"
fi

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