Get Docker EE for Red Hat Linux¶

Architectures and storage drivers¶

Docker EE supports Red Hat Enterprise Linux 64-bit, versions 7.4 and higher running on x86_64.

On Red Hat Enterprise Linux, Docker EE supports storage drivers, overlay2 and devicemapper. In Docker EE 17.06.2-ee-5 and higher, overlay2 is the recommended storage driver. The following limitations apply:

• OverlayFS: If selinux is enabled, the overlay2 storage driver is supported on RHEL 7.4 or higher. If selinux is disabled, overlay2 is supported on RHEL 7.2 or higher with kernel version 3.10.0-693 and higher.
• Device Mapper: On production systems using devicemapper, you must use direct-lvm mode, which requires one or more dedicated block devices. Fast storage such as solid-state media (SSD) is recommended.

FIPS 140-2 cryptographic module support¶

Federal Information Processing Standards (FIPS) Publication 140-2 is a United States Federal security requirement for cryptographic modules.

With Docker EE Basic license for versions 18.03 and later, Docker provides FIPS 140-2 support in RHEL 7.3, 7.4 and 7.5. This includes a FIPS supported cryptographic module. If the RHEL implementation already has FIPS support enabled, FIPS is also automatically enabled in the Docker engine.

To verify the FIPS 140-2 module is enabled in the Linux kernel, confirm the file /proc/sys/crypto/fips_enabled contains 1.

$ cat /proc/sys/crypto/fips_enabled
1

To enable FIPS 140-2 compliance on a system that is not in FIPS 140-2 mode, do the following:

Create a file called /etc/systemd/system/docker.service.d/fips-module.conf. Add the following:

[Service]
Environment="DOCKER_FIPS=1"

Reload the Docker configuration to systemd.

$ sudo systemctl daemon-reload

Restart the Docker service as root.

$ sudo systemctl restart docker

To confirm Docker is running with FIPS 140-2 enabled, run the docker info command.

docker info --format {{.SecurityOptions}}
[name=selinux name=fips]

Disabling FIPS 140-2¶

If the system has the FIPS 140-2 cryptographic module installed on the operating system, it is possible to disable FIPS 140-2 compliance.

To disable FIPS 140-2 in Docker but not the operating system, set the value DOCKER_FIPS=0 in the /etc/systemd/system/docker.service.d/fips-module.conf.

Reload the Docker configuration to systemd.

$ sudo systemctl daemon-reload

Restart the Docker service as root.

$ sudo systemctl restart docker

Find your Docker EE repo URL¶

To install Docker Enterprise, you will need the URL of the Docker Enterprise repository associated with your trial or subscription:

1. Go to https://hub.docker.com/my-content. All of your subscriptions and trials are listed.
2. Click the Setup button for Docker Enterprise Edition for Red Hat Enterprise Linux.
3. Copy the URL from Copy and paste this URL to download your Edition and save it for later use.

You will use this URL in a later step to create a variable called, DOCKERURL.

Uninstall old Docker versions¶

The Docker EE package is called docker-ee. Older versions were called docker or docker-engine. Uninstall all older versions and associated dependencies. The contents of /var/lib/docker/ are preserved, including images, containers, volumes, and networks.

$ sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine

Set up the repository¶

You only need to set up the repository once, after which you can install Docker EE from the repo and repeatedly upgrade as necessary.

1. Remove existing Docker repositories from /etc/yum.repos.d/:

   $ sudo rm /etc/yum.repos.d/docker*.repo
   

2. Temporarily store the URL (that you copied above) in an environment variable. Replace <DOCKER-EE-URL> with your URL in the following command. This variable assignment does not persist when the session ends:

   $ export DOCKERURL="<DOCKER-EE-URL>"
   

3. Store the value of the variable, DOCKERURL (from the previous step), in a yum variable in /etc/yum/vars/:

   $ sudo -E sh -c 'echo "$DOCKERURL/rhel" > /etc/yum/vars/dockerurl'
   

   Also, store your OS version string in /etc/yum/vars/dockerosversion. Most users should use 7, but you can also use the more specific minor version, starting from 7.2.

   $ sudo sh -c 'echo "7" > /etc/yum/vars/dockerosversion'
   

4. 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
   

5. Enable the extras RHEL repository. This ensures access to the container-selinux package required by docker-ee.

   The repository can differ per your architecture and cloud provider, so review the options in this step before running:

   For all architectures except IBM Power:

   $ sudo yum-config-manager --enable rhel-7-server-extras-rpms
   

   For IBM Power only (little endian):

   $ sudo yum-config-manager --enable extras
   $ sudo subscription-manager repos --enable=rhel-7-for-power-le-extras-rpms
   $ sudo yum makecache fast
   $ sudo yum -y install container-selinux
   

   Depending on cloud provider, you may also need to enable another repository:

   For AWS (where REGION is a literal, and does not represent the region your machine is running in):

   $ sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
   

   For Azure:

   $ sudo yum-config-manager --enable rhui-rhel-7-server-rhui-extras-rpms
   

6. Add the Docker EE stable repository:

   $ sudo -E yum-config-manager \
      --add-repo \
      "$DOCKERURL/rhel/docker-ee.repo"
   

Install from the repository¶

1. Install the latest patch release, or go to the next step to install a specific version:

   $ sudo yum -y install docker-ee docker-ee-cli containerd.io
   

   If prompted to accept the GPG key, verify that the fingerprint matches 77FE DA13 1A83 1D29 A418 D3E8 99E5 FF2E 7668 2BC9, and if so, accept it.

2. To install a specific version of Docker EE (recommended in production), list versions and install:

   1. List and sort the versions available in your repo. This example sorts results by version number, highest to lowest, and is truncated:

      $ sudo yum list docker-ee  --showduplicates | sort -r
      
      docker-ee.x86_64      19.03.ee.2-1.el7.rhel      docker-ee-stable-18.09
      

      The list returned depends on which repositories you enabled, and is specific to your version of Red Hat Enterprise Linux (indicated by .el7 in this example).

   2. Install a specific version by its fully qualified package name, which is the package name (docker-ee) plus the version string (2nd column) starting at the first colon (:), up to the first hyphen, separated by a hyphen (-). For example, docker-ee-18.09.1.

      $ sudo yum -y install docker-ee-<VERSION_STRING> docker-ee-cli-<VERSION_STRING> containerd.io
      

      For example, if you want to install the 18.09 version run the following:

      sudo yum-config-manager --enable docker-ee-stable-18.09
      

      Docker is installed but not started. The docker group is created, but no users are added to the group.

3. Start Docker:

   Note

   If using devicemapper, ensure it is properly configured before starting Docker.

   $ sudo systemctl start docker
   

4. Verify that Docker EE is installed correctly by running the hello-world image. This command downloads a test image, runs it in a container, prints an informational message, and exits:

   $ sudo docker run hello-world
   

   Docker EE is installed and running. Use sudo to run Docker commands.

Upgrade from the repository¶

1. Add the new repository.
2. Follow the installation instructions and install a new version.

Install with a package¶

1. Enable the extras RHEL repository. This ensures access to the container-selinux package which is required by docker-ee:

   $ sudo yum-config-manager --enable rhel-7-server-extras-rpms
   

   Alternately, obtain that package manually from Red Hat. There is no way to publicly browse this repository.

2. Go to the Docker EE repository URL associated with your trial or subscription in your browser. Go to rhel/. Choose your Red Hat Enterprise Linux version, architecture, and Docker version. Download the .rpm file from the Packages directory.

   Note

   If you have trouble with selinux using the packages under the 7 directory, try choosing the version-specific directory instead, such as 7.3.

3. Install Docker EE, changing the path below to the path where you downloaded the Docker package.

   $ sudo yum install /path/to/package.rpm
   

   Docker is installed but not started. The docker group is created, but no users are added to the group.

4. Start Docker:

   Note

   If using devicemapper, ensure it is properly configured before starting Docker, per the storage guide.

   $ sudo systemctl start docker
   

5. Verify that Docker EE is installed correctly by running the hello-world image. This command downloads a test image, runs it in a container, prints an informational message, and exits:

   $ sudo docker run hello-world
   

   Docker EE is installed and running. Use sudo to run Docker commands. See Linux postinstall to allow non-privileged users to run Docker commands.