# Red Hat Enterprise Linux Docker is supported on the following versions of RHEL: - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 6.6 or later This page instructs you to install using Docker-managed release packages and installation mechanisms. Using these packages ensures you get the latest release of Docker. If you wish to install using Red Hat-managed packages, consult your Red Hat release documentation for information on Red Hat's Docker support. ## Prerequisites Docker requires a 64-bit installation regardless of your Red Hat version. Docker requires that your kernel must be 3.10 at minimum. Red Hat 7 runs the 3.10 kernel, 6.6 does not. We make an exception for Red Hat 6.6. To run Docker on [Red Hat-6.6](http://www.centos.org) or later, you need kernel 2.6.32-431 or higher. To check your current kernel version, open a terminal and use `uname -r` to display your kernel version: $ uname -r 3.10.0-229.el7.x86_64 Finally, is it recommended that you fully update your system. Please keep in mind that your system should be fully patched to fix any potential kernel bugs. Any reported kernel bugs may have already been fixed on the latest kernel packages ## Install You use the same installation procedure for all versions of Red Hat Enterprise, only the package you install differs. There are two packages to choose from:
Version Package name
6.6 and higher

https://get.docker.com/rpm/1.7.0/centos-6/RPMS/x86_64/docker-engine-1.7.0-1.el6.x86_64.rpm

https://get.docker.com/rpm/1.7.0/centos-6/SRPMS/docker-engine-1.7.0-1.el6.src.rpm

7.X

https://get.docker.com/rpm/1.7.0/centos-7/RPMS/x86_64/docker-engine-1.7.0-1.el7.centos.x86_64.rpm

https://get.docker.com/rpm/1.7.0/centos-7/SRPMS/docker-engine-1.7.0-1.el7.centos.src.rpm

This procedure depicts an installation on version 6.6. If you are installing on 7.X, substitute that package for your installation. 1. Log into your machine as a user with `sudo` or `root` privileges. 2. Download the Docker RPM to the current directory. $ curl -O -sSL https://get.docker.com/rpm/1.7.0/centos-6/RPMS/x86_64/docker-engine-1.7.0-1.el6.x86_64.rpm 3. Use `yum` to install the package. $ sudo yum localinstall --nogpgcheck docker-engine-1.7.0-1.el6.x86_64.rpm 5. Start the Docker daemon. $ sudo service docker start 6. Verify `docker` is installed correctly. $ 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:aa03e5d0d5553b4c3473e89c8619cf79df368babd18681cf5daeb82aab55838d 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 group The `docker` daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user `root` and other users can access it with `sudo`. For this reason, `docker` daemon always runs as the `root` user. To avoid having to use `sudo` when you use the `docker` command, create a Unix group called `docker` and add users to it. When the `docker` daemon starts, it makes the ownership of the Unix socket read/writable by the `docker` group. >**Warning**: The `docker` group is equivalent to the `root` user; For details >on how this impacts security in your system, see [*Docker Daemon Attack >Surface*](/articles/security/#docker-daemon-attack-surface) for details. To create the `docker` group and add your user: 1. Log into your machine as a user with `sudo` or `root` privileges. 2. Create the `docker` group and add your user. `sudo usermod -aG docker your_username` 3. Log out and log back in. This ensures your user is running with the correct permissions. 4. Verify your work by running `docker` without `sudo`. $ docker run hello-world ## Start the docker daemon at boot To ensure Docker starts when you boot your system, do the following: $ sudo chkconfig docker on If 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](/articles/systemd/). ## Uninstall You can uninstall the Docker software with `yum`. 1. List the package you have installed. $ yum list installed | grep docker yum list installed | grep docker docker-engine.x86_64 1.7.0-0.1.el6 @/docker-engine-1.7.0-0.1.el6.x86_64 2. Remove the package. $ sudo yum -y remove docker-engine.x86_64 This command does not remove images, containers, volumes, or user created configuration files on your host. 3. To delete all images, containers, and volumes run the following command: $ rm -rf /var/lib/docker 4. Locate and delete any user-created configuration files.