Adding galera packages and exposing ports

[jcpowermac]

This PR adds the necessary package and exposes the ports required to run Galera.

Resolves #65

Testing was done in this repository:
https://github.com/jcpowermac/mariadb-ha-poc/blob/master/Dockerfile

[centos-ci]

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[centos-ci]

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[rhscl-bot]

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[rhscl-bot]

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[omron93]

Why which package is installed explicitly?

[test] [test-openshift]

[jcpowermac]

@omron93 I was testing with this earlier maybe it was left over. I don't need it let me remove it. I did this PR to get a feel if its going to be accepted. I can update the other Dockerfiles as well.

[jcpowermac]

@omron93 I am wrong we need which...

/opt/rh/rh-mariadb102/root/usr//bin/wsrep_sst_common: line 120: which: command not found

[hhorak]

I'm fine with doing these changes as a first step for having the galera replication ready, although I imagine that there should also be something more in the future -- scripts that would set up galera replication similarly to the master/slave replication and the only thing a user would need to do would be setting 'MYSQL_CLUSTER_NODES' (done probably automatically in k8s environment). I've already worked on this a bit previously, but did not really made it a good enough for even a PR:
hhorak@ae8ca15

Anyway, there is also a package rh-mariadb102-mariadb-server-galera, that ships few tools (clustercheck, galera_recovery) and galera.cnf. However, the galera.cnf enables wsrep features once installed, so it could influenced the use cases where wsrep is not ready, so I agree with this variant of PR, that does not installs rh-mariadb102-mariadb-server-galera.

That said, @jcpowermac, do you already have some experiences locally with using this mariadb image together with the galera?

[hhorak]

[test]
[test-openshift]

[jcpowermac]

@hhorak hmm the tools though might be useful right? So my use case is purely openshift/kube. My scripts are here: https://github.com/jcpowermac/mariadb-ha-poc
Under image-customization. There are incrediably simple and probably wouldn't be any use to this project. What was wrong with yours? Maybe it makes sense to move forward with your branch instead?

[tchughesiv]

imho the branches don't appear to be conflicting... any reason both use-cases couldn't be supported?

[rhscl-bot]

Can one of the admins verify this patch?

[jcpowermac]

@hhorak what can we do to get this PR moving?

[rhscl-bot]

Can one of the admins verify this patch?