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.