CentOS Virt SIG - Community virtualization packages on an immutable core
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The document discusses the CentOS virtualization special interest group led by Lars Kurth, outlining community efforts to support Xen alongside other technologies like KVM and Docker. It highlights the challenges of transitioning from a smaller community to larger, disaggregated groups, and the unique issues that arise from maintaining stability while accommodating different technological needs. The document details ongoing projects, goals for further development, and how community members can contribute to Sig efforts.
CentOS Virt SIG - Community virtualization packages on an immutable core
- 1. Lars Kurth (standing in for George Dunlap) Lead CentOS Virtualization SIG Community Manger, Xen Project Chairman, Xen Project Advisory Board lars_kurth
- 2. Community-oriented distros Debian, Gentoo, BSDs Enterprise targeted distros RedHat, SuSE Company-sponsored community distros Fedora, OpenSuSE Company-patched community distro Ubuntu Community-rebuilt distros CentOS, Scientific Linux Mcamcamca @ Flickr
- 3. Stability Use old versions Backport significant new functionality / bug fixes Supportability Don’t try to support everything Pick one technology and support that one well Eliminate all non-supported technologies
- 4. Community-rebuilt distro ...with a twist SIG = Special Interest Group
- 5. Released 10 July 2011 6 months after the release 10000’s of users still using CentOS 5 The reason? Xen Project RHEL had purchased Qumranet Made KVM the hypervisor of choice for RHEL6 Tons of users who still wanted to use Xen CentOS community members approached the Xen Community At FOSDEM 2012, we started to make a plan to fix this
- 6. Supplementary yum repo Xen Domain 0 kernel libvirt
- 7. What if people want all the boring, slow-changing stability of an enterprise kernel, except... ...for one application, where they want something newer? ...a different technology than the one chosen by the “commercial upstream”?
- 8. Community-developed “patches” on the immutable core Mechanism: Additional yum repo that adds / overrides core packages General approach: Make it up as we go along Mcamcamca @ Flickr
- 9. SIGs Approved: Cloud SIG (OpenStack, &co ) Cloud Instance SIG (Amazon instances, &c) Virtualization (Xen, Docker, oVirt) Storage (CentOS as a storage node) Atomic ... it would seem so!
- 10. Maria Ly @ Flickr Issues we have worked through in the last 12 months Some are not yet fully resolved
- 11. Moving from a small tight-knit group to larger disaggregated groups Everyone’s trusted to Want to trust everyone, but trust needs to be limited Not unique to CentOS model Complicated by the already-large community Also See: cbs.centos.org/koji/ wiki.centos.org/HowTos/CommunityBuildSystem CERN CentOS Dojo presentation @ bit.do/centos-sig-cbs
- 12. Not even minor fixes can be added to the CentOS-Core So even minor changes mean re-building the whole package Example: virt-install uses blktap1 instead of blktap2 Re-building also means tracking Core changes Nicholas A. Tonelli @ Flickr
- 13. Example: Docker for C7 (in the Virt SIG) uses stock C7 kernel Xen for C7 will need a domain-0 enabled kernel Solutions: Break down into virt7-xen and virt7-docker repos Share the same SIG delivered kernel Challenge: Avoiding repo multiplication Mcamcamca @ Flickr
- 14. What if you want to install two different SIGs, but: The two SIGs require different versions of the same package (e.g., the kernel) General approach: We’ll figure it out when we get there. Mcamcamca @ Flickr
- 15. CentOS core has the stability guarantees of the upstream enterprise OS CentOS SIGs don’t have nearly as much testing behind them But they still carry the CentOS name Oversight by CentOS board member important
- 16. Maintainers having taken ownership for several technologies: Xen, Docker, oVirt wiki.centos.org/SpecialInterestGroup/Virtualization
- 17. Done: Projects building in the community build system for CentOS 6 Updated to Xen 4.4.1 and libvirt 1.2.10 Already a user: “yum update” wiki.centos.org/HowTos/Xen/Xen4QuickStart To-do: Build for CentOS 7 Update kernel to 3.14 (currently 3.10)
- 18. Docker 1.4.1 for CentOS 7 in CBS Close to release (in testing, tag “virt7-testing”) Working on Rocket
- 19. Added to Virt SIG 6 weeks ago Goals: Build qemu-kvm binary with live snapshot support oVirt Live “spin” oVirt Node “spin” Interface with Storage SIG … for GlusterFS support
- 20. See if there’s an existing SIG you can join E-mail centos-devel with your proposal Convince one of the CentOS Board members to sponsor you. wiki.centos.org/SpecialInterestGroup www.centos.org/about/governance/sigs
Editor's Notes
- #3: Note: all of these work on the basis that each package is unique and that versions of packaged software is tightly managed
- #4: Mention: Somewhat different to what SIGs are trying to achieve
- #5: Bridge: history of how SIGs came about
- #6: A lot more than in the previous release. Took until CentOS 6.3 until more than 50% of users had migrated
- #8: This slide sort of assumes that people know the primary attraction of CentOS: the “slow, stable, enterprise-yness” of it. I was looking for a good place to introduce this earlier.
- #13: Clarify: into RHEL The blktap2 fix for virt-install is a one-line fix.
- #14: The first mean that packages from the two repos cant be used together
- #15: CentOS Atomic-host from Atomic uses docker from virt-sig Planned: oVirt is planning to use GlusterFS from Storage SIG … There are a few more --- Need some process at some stage
- #18: TODO: Main link … TODO: Just a yum update? Ask KB
- #19: Getting started docs + announcement Mention that we agreed to try and use a common kernel for the Virt SIG builds Discussing: Trunk Docker packages
- #21: In the Virt SIG we require an individual (or several) to step up and maintain the relevant packages and participate in the SIG