Why don't enterprise versions of linux support docker?

[LearningTechAndDev]

I'm looking for insight into something I've noticed. I was told that Docker is very popular. So I built some software that uses Docker as the container system and Docker Swarm as the orchestration system. Ive been using Ubuntu Server LTS on x86 architecture machines and everything works great.

One day, a client asked me to pick an "enterprise" edition of linux and then make my software work on it.

To my surprise, all the enterprise editions of linux that I'm aware of (which are RHEL, SUSE, Oracle Linux) did not support docker on x86 architecture. Instead, all the enterprise editions of linux only suport docker on s390x architecture which is some kind of IBM technology. I think enterprise editions of linux use other container systems over docker.
Why don't enterprise editions of linux like docker on x86 architecture?

 

[dos2unix]

Podman has taken over as the default container application on RHEL based systems,
as of about 2 years ago. You can still get docker-ce through the normal EPEL channels.

What is Podman?

Podman is an open source tool for developing, managing, and running containers on your Linux systems.

www.redhat.com

 

[KGIII]

Hmm... You should be able to install Docker on RHEL by using the method for CentOS. Have you tried that?

 

[dos2unix]

You should be able to install Docker on RHEL by using the method for CentOS.

I can confirm that docker is NOT included in the standard repos.
docker-ce has been removed from epel8 repos.

but this still works.

sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo

sudo dnf install -y docker-ce

 

[KGIII]

I can confirm that docker is NOT included in the standard repos.

Heh... You made me go look. They suggest using the CentOS method:

Install Docker Engine on RHEL

Instructions for installing Docker Engine on RHEL

docs.docker.com

(See the note section.)

 

[dos2unix]

They suggest using the CentOS method:

At least for the IBM s390x mainframe
Are they still making those?

 

[KGIII]

At least for the IBM s390x mainframe
Are they still making those?

Unless I'm mistaken (and I could easily be mistaken) the CentOS version runs on the usual architectures.

Install Docker Engine on CentOS

Learn how to install Docker Engine on CentOS. These instructions cover the different installation methods, how to uninstall, and next steps.

docs.docker.com

And, yeah, those were still in production last I knew. The mainframe still exists - though it isn't quite what it used to be, such as needing a timeshare to access it for a certain amount of time.

Man, those were the days!

(I say that sort of in jest, the school I went to had access to the mainframe at Dartmouth, but I only used it a few times. At the time, I had no appreciation for computers.)