Docker is supported on Red Hat Enterprise Linux 7. Docker requires a 64-bit installation regardless of your Red Hat version. Docker requires that your kernel must be 3.10 at minimum, which Red Hat 7 runs.
Install with yum
- Log into your machine as a user with
- Make sure your existing yum packages are up-to-date.
$ sudo yum update
- Add the yum repo yourself.
$ sudo tee /etc/yum.repos.d/docker.repo <<-EOF [dockerrepo] name=Docker Repository baseurl=https://yum.dockerproject.org/repo/main/centos/7 enabled=1 gpgcheck=1 gpgkey=https://yum.dockerproject.org/gpg EOF
- Install the Docker package.
$ sudo yum install docker-engine
If you are getting ' Public key not installed' error try installing like below
yum install --nogpgcheck docker-engine
- Start the Docker daemon.
$ sudo service docker start or $ sudo systemctl start docker.service
dockeris installed correctly by running a test image in a container.
$ sudo docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from hello-world a8219747be10: Pull complete 91c95931e552: Already exists hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security. Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1.7.1cf5daeb82aab55838d Status: Downloaded newer image for hello-world:latest Hello from Docker. This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (Assuming it was not already locally available.) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash For more examples and ideas, visit: http://docs.docker.com/userguide/
Create a docker groupThe
dockerdaemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user
rootand other users can access it with
sudo. For this reason,
dockerdaemon always runs as the
rootuser.To avoid having to use
sudowhen you use the
dockercommand, create a Unix group called
dockerand add users to it. When the
dockerdaemon starts, it makes the ownership of the Unix socket read/writable by the
dockergroup is equivalent to the
rootuser; For details on how this impacts security in your system, see Docker Daemon Attack Surface for details.To create the
dockergroup and add your user:
- Log into your machine as a user with
- Create the
sudo groupadd docker
- Add your user to
sudo usermod -aG docker your_username
- Log out and log back in.This ensures your user is running with the correct permissions.
- Verify your work by running
$ docker run hello-world
Start the docker daemon at bootTo ensure Docker starts when you boot your system, do the following:
$ sudo chkconfig docker onIf you need to add an HTTP Proxy, set a different directory or partition for the Docker runtime files, or make other customizations, read our Systemd article to learn how to customize your Systemd Docker daemon options.
UninstallYou can uninstall the Docker software with
- List the package you have installed.
$ yum list installed | grep docker yum list installed | grep docker docker-engine.x86_64 1.7.1-0.1.el7@/docker-engine-1.7.1-0.1.el7.x86_64
- Remove the package.
$ sudo yum -y remove docker-engine.x86_64This command does not remove images, containers, volumes, or user created configuration files on your host.
- To delete all images, containers, and volumes run the following command:
$ rm -rf /var/lib/docker
- Locate and delete any user-created configuration files.