title: How to change docker installation directory in centos 7 with docker 1.13 version
body: <p>I have enclosed the docker details below,</p>
  
  <p>$ docker info</p>
  
  <pre><code>Containers: 3
   Running: 3
   Paused: 0
   Stopped: 0
  Images: 26
  Server Version: 1.13.0
  Storage Driver: overlay
   Backing Filesystem: xfs
   Supports d_type: false
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
   Volume: local
   Network: bridge host macvlan null overlay
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Init Binary: docker-init
  containerd version: 03e5862ec0d8d3b3f750e19fca3ee367e13c090e
  runc version: 2f7393a47307a16f8cee44a37b262e8b81021e3e
  init version: 949e6fa
  Security Options:
   seccomp
    Profile: default
  Kernel Version: 3.10.0-514.6.1.el7.x86_64
  Operating System: CentOS Linux 7 (Core)
  OSType: linux
  Architecture: x86_64
  CPUs: 8
  Total Memory: 15.51 GiB
  Name: docker
  ID: WYAF:SDYL:LVAU:OKDP:O6K2:ZLG6:RMIB:SET4:SWGN:6TBR:ST6K:4W55
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): false
  Registry: https://index.docker.io/v1/
  Experimental: false
  Insecure Registries:
   127.0.0.0/8
  Live Restore Enabled: false
  </code></pre>
  
  <p>$ docker system df </p>
  
  <pre><code>TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
  Images              4                   3                   4.441 GB            -1.644e+09 B (-37%)
  Containers          3                   3                   6.867 GB            0 B (0%)
  Local Volumes       0                   0                   0 B                 0 B
  </code></pre>
  
  <p>$ df -h</p>
  
  <pre><code>Filesystem               Size  Used Avail Use% Mounted on
  /dev/mapper/centos-root   14G   14G  647M  96% /
  devtmpfs                 7.8G     0  7.8G   0% /dev
  tmpfs                    7.8G     0  7.8G   0% /dev/shm
  tmpfs                    7.8G   25M  7.8G   1% /run
  tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
  /dev/sda1                497M  216M  281M  44% /boot
  /dev/sdb                 296G   65M  281G   1% /mnt
  overlay                   14G   14G  647M  96% /var/lib/docker/overlay/dfa0c4e618c259bf046b454b27a7963fb31b9d4e95cc745ed28696b0791e3166/merged
  shm                       64M     0   64M   0% /var/lib/docker/containers/6e978cecc472322ef984cdb73117ed0243eb88c30d37c93827084bec88dcf15a/shm
  overlay                   14G   14G  647M  96% /var/lib/docker/overlay/9cdd3dc933f93febccaa7e06ba2f86023d3dd655614be5d9e636ab75f21873f4/merged
  shm                       64M     0   64M   0% /var/lib/docker/containers/ed44174945e331246f622e42a6ea646504075a91e4922168d895ed295cd24109/shm
  overlay                   14G   14G  647M  96% /var/lib/docker/overlay/c2bc2c73f0f3b0e717f8ea134aad8554ebb6b77c2dcfd85e8035a645bf75d074/merged
  shm                       64M     0   64M   0% /var/lib/docker/containers/26fd8e67dc7da80f6047add17aaddd7f67f763966d4a6b65d08680ac41774a28/shm
  tmpfs                    1.6G     0  1.6G   0% /run/user/0
  </code></pre>
  
  <p>As we can see the space in root directory is filled up, so i would like to mount the  docker installation directory to <code>/mnt</code>. Many suggested to include the -g option, but i couldnt able to provide that option.</p>
  
  <p>Could anyone please help me how to mount to /mnt directory and where to make those changes. I am using centos 7 and i have installed docker with the help of below link  and i have followed exactly the same steps, </p>
  
  <p><a href="https://docs.docker.com/engine/installation/linux/centos/" rel="noreferrer">https://docs.docker.com/engine/installation/linux/centos/</a></p>
  
  <p>And followed the steps provided here <a href="https://forums.docker.com/t/how-do-i-change-the-docker-image-installation-directory/1169" rel="noreferrer">https://forums.docker.com/t/how-do-i-change-the-docker-image-installation-directory/1169</a></p>
  
  <p>I couldnt find a docker file in <code>/etc/sysconfig</code> or in <code>/etc/default</code>. Please suggest where to change this</p>