centos docker

1. Install required packages. yum-utils provides the yum-config-manager utility, and device-mapper-persistent-data and lvm2 are required by the devicemapper storage driver.

   $ sudo yum install -y yum-utils 
     device-mapper-persistent-data 
     lvm2
   

2. Use the following command to set up the stable repository.

   $ sudo yum-config-manager 
       --add-repo 
       https://download.docker.com/linux/centos/docker-ce.repo
   

Optional: Enable the nightly or test repositories.

These repositories are included in the docker.repo file above but are disabled by default. You can enable them alongside the stable repository. The following command enables the nightly repository.

$ sudo yum-config-manager --enable docker-ce-nightly

To enable the test channel, run the following command:

$ sudo yum-config-manager --enable docker-ce-test

You can disable the nightly or test repository by running the yum-config-manager command with the --disable flag. To re-enable it, use the --enable flag. The following command disables the nightly repository.

$ sudo yum-config-manager --disable docker-ce-nightly

Learn about nightly and test channels.

INSTALL DOCKER CE

1. Install the latest version of Docker CE and containerd, or go to the next step to install a specific version:

   $ sudo yum install docker-ce docker-ce-cli containerd.io
   
   
   
   Let's get started by modifying systemd's docker start up script. Open file /lib/systemd/system/docker.service with your favorite text editor and replace the following line where /new/path/docker is a location of your new chosen docker directory:

   FROM:
   ExecStart=/usr/bin/docker daemon -H fd://
   TO:
   ExecStart=/usr/bin/docker daemon -g /new/path/docker -H fd://
   

   When ready stop docker service:

   # systemctl stop docker
   

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   It is important here that you have completely stopped docker daemon. The following linux commandwill yield no output only if docker service is stopped:

   # ps aux | grep -i docker | grep -v grep
   

   If no output has been produced by the above command, reload systemd daemon:

   # systemctl daemon-reload
   

   Once this is done create a new directory you specified above and optionally rsync current docker data to a new directory:

   # mkdir /new/path/docker
   # rsync -aqxP /var/lib/docker/ /new/path/docker