Wednesday, August 16, 2017

Book about Docker on Z

IBM has published a very nice document about Docker on the mainframe.
It is available as PDF download as well as via Knowledge Center. You can read one of the best container/Docker introductions I've seen on the Internet, as well as a good coverage of basic concepts around containers and Docker in the context of Z.
Chapter overiew:

Docker Enterprise Edition available for IBM Z

It has been signaled earlier this year, now it has been announced: Docker Enterprise Edition is available for Z. Version 17.06.1 has now been made available, and not only is it a new version for x86, but it also supports Z as "managed-to" platform. A lot of work went into this, and this is what the journey starts with:
  • the engine of Docker Enterprise Edition will run on Linux on z Systems
  • Docker Trusted Registry (DTR) can handle s390x images (while DTR runs on x86)
  • Docker Universal Control Plane (UCP) can manage s390x nodes (while the UCP UI runs on x86)
So what exactly do these components provide? Here are more details (and some screenshots that may show the function set much better):

Monday, July 24, 2017

Registry Option: SUSE Portus

An Open Source alternative to Docker Trusted Registry is Portus from SUSE. This is a front end to a private Open Source registry that allows for fine grained control of registry access and content: it can manage users, teams, and namespaces (no, not the kernel ones). It can integrate with LDAP for authentication and offers an audit trail, and can be extended for security scanning.
Portus dashboard with activity log
To play with Portus, we need:
  1. docker-compose.
  2. a private registry
  3. Portus

New Docker Engine in SLES 12 Containers Module

A couple of days ago, SUSE published a major update to the Docker engine. The Containers Module now offers version 17.04-CE of the engine (docker-17.04.0_ce-98.2.s390x.rpm).

Friday, July 7, 2017

An Overview on s390x Base Images

For s390x, quite a few options for base images are available on Docker Hub/Docker Store these days. They vary from enterprise environments over community distributions to minimal images. This post gives an overview on what is provided by various sources.

Thursday, June 29, 2017

Docker CE for all distributions

The previous post mentioned that Docker provides CE packages for Ubuntu. For users of Debian, SLES, RHEL, Fedora, ClefOS, openSUSE, and Alpine, there is still an option to get the latest Docker CE version to their environment:

Wednesday, June 28, 2017

First CE for s390x by Docker

Today, Docker CE v17.06 has been released. It offers a series of enhancements as laid out in their announcement blog post. However, there is one more thing: the release comes with s390x binaries. Out of the three major enterprise distributions supported on the mainframe, Docker offers CE for Ubuntu. Particularly, Docker CE is not provided for SLES and RHEL (on any platform). Accordingly, binaries are available for Ubuntu for IBM z Systems.
(Note: See the next post if your distribution of choice happens to be something else than Ubuntu.)

Monday, June 26, 2017

Another Base Image Option: Alpine for s390x

Alpine Linux has announced their new 3.6 release which includes s390x support. Alpine is a minimal Linux distro. Contrary to other distributions, it uses musl as runtime library (not glibc), helping in downsizing images.

A Docker image named s390x/alpine is available at Docker Hub and while being a fully functional base, it is just 5 MB (!) in size:

Friday, June 23, 2017

New Docker Engine Release Scheme

It's a while since Docker changed their release naming system. In the past, the version looked like 1.xx, with xx counting up. After 1.13, Docker moved to a pattern that is easy to grasp and accommodates various life cycles of free and commercial releases.

Thursday, June 22, 2017

Docker in the Datacenter

In this year's DockerCon back in April 2017, then-Docker CEO Ben Golub announced Docker will support the mainframe (and Power).


While technically, this is no news, it means Docker, Inc. will support s390x -- good news and another option besides distribution offerings for those looking at running Docker in production on the mainframe. More details to follow as they are announced and available.

Wednesday, June 21, 2017

Relaunch of Containerz Blog

After quite some inactivity on this blog, I decided to revive this blog. Expect to read regularly about news, how-tos and other information related to container technology on the mainframe. A few posts are in the pipe already.