Ubuntu 16.04 Move Docker Root

shell script to move the docker root directory on ubuntu 16.04 xenial. get the script on github or download directly.

to use this script simply edit the line /dockerdir_new='/docker/var/' to reflect your intended new docker root location and chmod +x move-docker-root.sh, then run with ./move-docker-root.sh.

tested working on:

client: version: 17.05.0-ce api version: 1.29 go version: go1.7.5 git commit: 89658be built: thu may 4 22:10:54 2017 os/arch: linux/amd64

server: version: 17.05.0-ce api version: 1.29 (minimum version 1.12) go version: go1.7.5 git commit: 89658be built: thu may 4 22:10:54 2017 os/arch: linux/amd64 experimental: false

move-docker-root.sh

#!/bin/bash
#sysinfo.io
#change paths below to suit your needs
dockerdir_new='/docker/var/'
dockerdir_old='/var/lib/docker/'

set -e
dockerdir_new2=$(echo "$dockerdir_new" | sed 's/\//\\\//g')
systemctl stop docker
mkdir -p $dockerdir_new
rsync -a $dockerdir_old* $dockerdir_new
sed -i.bak "/execstart=\/usr\/bin\/dockerd \-h fd:\/\//c execstart=\/usr\/bin\/dockerd \-h fd:\/\/ -g ${dockerdir_new2}" /lib/systemd/system/docker.service
mv $dockerdir_old /var/lib/docker.bak/
ln -s $dockerdir_new /var/lib/docker
systemctl daemon-reload
systemctl start docker.service
printf '\n* the docker systemd config has been backed up to /lib/systemd/system/docker.service.bak\n* a backup of the old docker root has been copied to /var/lib/docker.bak/\n\n'
docker info | grep 'root dir'