Tag Archives: centos

RDO and CentOS

Continuing in the series about the RDO Meetup in Vancouver, in this recording we have Karsten Wade, of the CentOS project, talking about CentOS’s relationship with RDO, and with OpenStack in general. He talks about the CentOS build infrastructure, CI, package repos, and the CentOS Cloud SIG.

(If the player below doesn’t work for you, you can listen HERE.)


RDO on CentOS 7

With CentOS 7 now available, I quickly put it on my OpenStack demo laptop, and started installing RDO. It mostly just worked, but there were a few roadblocks to circumvent.

As usual, I followed the RDO Quickstart, so I won’t duplicate those steps here, in detail, but it goes like:

sudo yum update -y && sudo yum install -y http://rdo.fedorapeople.org/rdo-release.rpm && sudo yum install -y openstack-packstack && packstack --allinone

Comparison of string with 7 failed

The first problem occurs pretty quickly, in prescript.pp, with the following error message:

Comparison of String with 7 failed

This is due to the change in CentOS versioning scheme – the latest release of CentOS is version 7.0.1406, which is not a number. The script in question assumes that the version number is a number, and does a numerical comparison:

if $::operatingsystem in $el_releases and $::operatingsystemrelease < 7 {

This fails, because $::operatingsystemrelease is a string, not a number.

The solution here is to edit the file /usr/lib/python2.7/site-packages/packstack/puppet/templates/prescript.pp and replace the variable $::operatingsystemrelease with $::operatingsystemmajrelease around line 15.

While you’re at it, do this for every file in that directory, where $operatingsystemrelease is compared to 7.

See https://bugzilla.redhat.com/show_bug.cgi?id=1117035 for more detail, and to track when this is fixed.

mysql vs mariadb

The second problem, I’m not sure I understand just yet. The symptom is that mysql.pp fails with

Error: Could not enable mysqld:

To skip to the end of the story, this appears to be related to the switch from mysql to mariadb about a year ago, finally catching up with CentOS. The related bug is at https://bugzilla.redhat.com/show_bug.cgi?id=981116

The workaround that I used was:

# rm /usr/lib/systemd/system/mysqld.service 
# cp /usr/lib/systemd/system/mariadb.service /usr/lib/systemd/system/mysqld.service
# systemctl stop mariadb
# pkill mysql
# rm -f /var/lib/mysql/mysql.sock

Then run packstack again with the generated answer file from the last time.

However, elsewhere in the thread, we were assured that this shouldn’t be necessary, so YMMV. See https://www.redhat.com/archives/rdo-list/2014-July/msg00055.html for further discussion.

That’s all, folks

After those two workarounds, packstack completed successfully, and I have a working allinone install.

Hope this was helpful to someone.

UPDATE: The next time through, I encountered https://ask.openstack.org/en/question/35705/attempt-of-rdo-aio-install-icehouse-on-centos-7/

The workaround is to replace contents of /etc/redhat-release with “Fedora release 20 (Heisenbug)” and rerun packstack.

Turns out that this also fixes the mysql/mariadb problem above without having to go through the more complicated process.