Install Docker distribution for Red Hat

Configure Docker and SELinux on Red Hat engine servers.

Red Hat maintains its own package of Docker, which is the version used in OpenShift Container Platform environments, and is available in the RHEL Extras repository.

If running RHEL v8 or higher, the engine installs Podman packages and configures the operating system to enable Podman in rootless mode.

For more information about the different packages available to install on Red Hat, see the Red Hat Knowledge Base Article (requires a Red Hat subscription to access).

1. Install Red Hat’s Docker package.
2. Run the following commands.

   systemctl enable docker.service

   systemctl restart docker.service
3. Change ownership of the Docker daemon socket so members of the dockerroot user group have access.

   1. Edit or create the file /etc/docker/daemon.json.
   2. Enable OS group dockerroot access to Docker by adding the following entry to the /etc/docker/daemon.json: "group": "dockerroot"file. For example:

      { "group": "dockerroot" }
   3. Restart the Docker service by running the following command.

      systemctl restart docker.service
   4. Install the engine
   5. After the engine is installed, run the following command to add the demisto os user to the dockerroot os group (Red Hat uses dockerroot group instead of docker).

      usermod -aG dockerroot demisto
   6. Restart the engine.
4. Set the required SELinux permissions.

   The Cortex Cloud engine uses the /var/lib/demisto/temp directory (with subdirs) to copy files and receive files from running Docker containers. By default, when SELinux is in enforcing mode directories under /var/lib/ it cannot be accessed by Docker containers.

   1. To allow containers access to the /var/lib/demisto/temp directory, you need to set the correct SELinux policy type, by typing the following command.

      chcon -Rt svirt_sandbox_file_t /var/lib/demisto/temp
   2. ( Optional) Verify that the directory has the container_file_t SELinux type attached by running the following command.

      ls -d -Z /var/lib/demisto/temp
   3. Configure label confinement to allow Python and PowerShell containers to access other script folders.

      In the d1.conf file, set the following parameters:

      	Key	Value
      For Python containers	python.pass.extra.keys	--security-opt=label=level:s0:c100,c200
      For PowerShell containers	powershell.pass.extra.keys	--security-opt=label=level:s0:c100,c200

   4. Open any issue and in the issue War Room CLI, run the /reset_containers command.