devel April 2014

devel@lists.centos.org

46 participants
30 discussions

[cloud] Features of a cloud VM template
by Nux! 09 Apr '14

09 Apr '14

Hello, While the Cloud SIG is still being established, let's get to actual work and think of a set of features for a CentOS cloud template. I am referring here to VMs, not containers (e.g. docker). This is how I see it so far, please feel free to come with suggestions/comments/questions. A - Single partition for simplicity (and lack of good arguments against it) - dracut-modules-growroot included so the template partition will expand to match target, cloud-init in charge of resize2fs B - To swap or not to swap? C - "tuned-adm profile virtual-host" which translates to: - kern.sched_min_granularity_ns 10ms - kernel.sched_wakeup_granularity_ns 15ms - vm.dirty_ratio 40% - vm.swappiness 30 - IO scheduler "deadline" - fs barriers off - CPU governor "performance" - disk readahead 4x D - tso and gso off on the network interfaces http://s.nux.ro/gsotso E - network interface remapping (75-persistent-net-generator.rules, BZ 912801) F - Selinux on. Do we relabel for uniqueness? Seen small VMs run out of memory while relabelling.. G - PERSISTENT_DHCLIENT="1" (BZ 1011013) H - Bundle all the paravirt drivers in the ramdisk (virtio/xen/vmware/hyperv) so the same image can boot everywhere? I - Per "stack" requirements (e.g. cloudstack relies a lot on root user and password logins, openstack tends not to, SSH key only logins etc etc) That's about all that crosses my mind for now. Thoughts? Lucian -- Sent from the Delta quadrant using Borg technology! Nux! www.nux.ro

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Official Docker Image
by Adam Miller 05 Apr '14

05 Apr '14

Hello all, I was recently in #docker-dev on freenode and it was brought up that they are currently in search of a maintainer for the official CentOS docker image for the docker index[0]. I would be happy to do this but I also know that there is a core team and a Cloud SIG already in place and wanted to bring this up to the group so I'm not stepping on anyones toes *and* so that I'm not slinging around an image called "official" without blessing from the project and community at large. I'm aware of the docker scripts[1] from the Cloud SIG and would effectively just like to find a way to have us collaborate on this (I would like to join which ever group ends up being the owner of this task) and then farm builds somewhere that can be uploaded by whom ever has the appropriate permissions to the docker index. Looking forward to thoughts from the group. Thanks, -AdamM [0] - https://index.docker.io/ [1] - https://github.com/CentOS/sig-cloud-instance-build/tree/master/docker

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Storage SIG Moving Forward
by Patrick McGarry 04 Apr '14

04 Apr '14

Now that the Storage SIG has been (mostly) ratified, I wanted to start looking forward. We are already started on some of the simple first steps; so giving a little time to have a few tasks under our belt (and give people a chance to wrap their head around the tasks ahead) we're aiming for the first SIG meeting to be on: 04-Apr @ 15:00 UTC. Anyone who is interested in attending please let me know before then and I'll make sure you're added to the invite. Our current plan is to just keep it simple w/ a Google Hangout (not on-air) so if we grow beyond 10 we'll need to know beforehand. In this meeting we'll be discussing the following: * Infrastructure plans (repositories, lists, etc) * Form & Function (who does what, how repos are handled) * Rough roadmap (what to accomplish when) * Identify potential additions to SIG (have Ceph&Gluster, anyone else?) * Any other ideas/questions that may come up If you have any questions in the meantime feel free to reply here, or hit me directly via email (patrick(a)inktank.com) or on IRC (scuttlemonkey). Thanks. Best Regards, Patrick McGarry Director, Community || Inktank http://ceph.com || http://inktank.com @scuttlemonkey || @ceph || @inktank

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t_functional tests and integrated packages
by Davide Principi 04 Apr '14

04 Apr '14

Hi all, I'd like to write t_functional tests covering the setup of different packages working together. For instance, think about a complete mail server setup, consisting of Postfix, Amavis, ClamAV, Dovecot and more... This is the typical situation I deal with, when I run configuration management software, like NethServer -- I hope it will be a CentOS variant :) -- acting on the top of CentOS. How to extend t_functional in that case? Should I add a "role" test, such as the existing "lamp"? I saw "role" tests are executed on the same environment, after other "package" tests. What if a particular role test must be executed on a pristine environment? I'm worried about - say - OpenLDAP or MySQL: what if they are provisioned by different test cases in a conflicting way? Thanks in advance, -- Davide Principi Nethesis srl - Pesaro (Italy)

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CentOS docker testing image
by Karanbir Singh 04 Apr '14

04 Apr '14

hi, I've just pushed to cloud.centos.org a test build for a CentOS-6-x86_64 docker image. Please test and provide feedback. The image is hosted at http://cloud.centos.org/centos/6/devel/ and is called : CentOS-6.5-x86_64-GA-docker_01.img.tar.bz2 sha256sum for this file: dab02fd8eafa80995830d0bacdf6a7ae6bcad8cd94af6f71c747dc861ebb77d9 ---- Known Issues: * Need to run rpm --rebuilddb inside the container once, otherwise yum is largely non functional. * There seem to be some selinux issues ( afaict, leaving libselinux intact would fix that ) ---- Using this image: (with epel enabled, on your CentOS-6.5/x86_64 host ): # yum install docker-io # /sbin/service docker start # docker import http://cloud.centos.org/centos/6/devel/CentOS-6.5-x86_64-GA-docker_01.img.t… c65_x64 test1 # docker images ( you should see the image listed ) # docker run -t -i <image id> /bin/bash ( you should now be inside the container ) bash-4.1# rpm --rebuilddb ---- Contributing changes: please send pull requests via: https://github.com/CentOS/sig-cloud-instance-build regards, -- Karanbir Singh, Project Lead, The CentOS Project +44-207-0999389 | http://www.centos.org/ | twitter.com/CentOS GnuPG Key : http://www.karan.org/publickey.asc

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devel April 2014