Juju and CentOS

Juju 1.24.0 has initial support for CentOS as a deployment OS (the Juju client software is already supported on CentOS - see the Install Documentation page). This is experimental and has a number of known issues. However, most of thefunctionality of Juju is there and ready to be used and tested. CentOS should be deployable on any cloud that supports cloud-init in it's CentOS images. It is possible to use CentOS as both a state machine (taking the known limitations into account) and as a normal machine.

Deploying a charm on CentOS is no different than deploying one on Ubuntu or Windows. The only thing that needs to change is the series which is "centos7". For example, from Launchpad:

juju deploy lp:~me/centos7/charm

or from a local charm:

juju deploy --repository=/home/user/charms local:centos7/charm

Currently there are no charms in the Charm Store available for CentOS. The process or writing one should be no different from the Ubuntu charms besides keeping in mind the fact that one shouldn't use Ubuntu specific calls (such as apt-get).

Cloudbase have a guide for setting up a MAAS environment using CentOS at:

http://wiki.cloudbase.it/juju-centos

Note that Centos7 agents are already in streams. There is no need install Go, compile, tar, and running Juju metadata. You can sync the streams to a web server visible to your Juju environment.

mkdir local
juju sync-tools --local-dir local
cp -r local/tools <path/to/webserver>

Current known issues

  • Containers are not yet supported
  • There is a lack of mongo tools at the moment so any functionality depending on those is not available(for example backups)
  • There is no way to currently specify a proxy or mirror for yum in the environment configuration. The values that you specify for apt packages will be used for yum packages as well. This limitation will be fixed as soon as possible.