Unable to install/run Docker on Red Hat Linux 7

General
1

we installed Docker on RHEL using the steps in:

our installation log can be seen at:

but when we try to run Docker we get error

$ sudo systemctl start docker.service
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

systemctl status show:

$ systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2020-04-09 00:08:39 UTC; 13s ago
     Docs: http://docs.docker.com
  Process: 11020 ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --authorization-plugin=rhel-push-plugin --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current --init-path=/usr/libexec/docker/docker-init-current --seccomp-profile=/etc/docker/seccomp.json $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=1/FAILURE)
 Main PID: 11020 (code=exited, status=1/FAILURE)

How can we fix this?

2

Your Gist does indicate that you did not follow the linked installation instructions.
Your Gist indicates that your use Redhat’s redistributed docker package.
In this canse, I would suggest to raise a support ticket @Redhat.

If you want to use the official docker package, you will need to get a Docker Enterprise Subscription.
If replacing RHEL with CentOS is an option: there is an offical docker package for CentOS

On RHEL8, Redhat removed the docker package and replaced it with podman and buildah.

3

we were able to fix it following the instructions at https://stackoverflow.com/a/50357182/147530

bash # vi /etc/sysconfig/docker-storage
...
DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper "
...

bash # vi /etc/sysconfig/docker-storage-setup
...
STORAGE_DRIVER=devicemapper
...

adding a note in case someone runs into the issue.

we found the syslogs in /var/log/messages and that gave us a clue as to what the problem was

Apr  9 13:00:03 localhost dockerd-current: Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Either boot into a newer kernel or disable selinux in docker (--selinux-enabled=false)