Stop docker containers older than 1 day old

stop-old-containers.sh

#!/bin/bash -eux

yesterday=$(date -d yesterday +%s)
# dnsdock should not be stopped : we limit to the containers created after it
docker ps --filter since=dnsdock -q --format "{{.ID}} {{.CreatedAt}}" | while read line
do
    # line looks like:
    # 123456789abcdef 2017-01-01 00:00:00 +02:00 CEST
    set $line
    id=$1
    # date doesn't like the CEST part so we skip it
    date=$(date -d "$(echo ${@:2:3})" +%s)
    if [ $date -le $yesterday ]; then
        docker stop $id
    fi
done