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Masakari: Virtual Machine High Availability for OpenStack
- 1. © 2015 NTT Software Innovation Center Masakari: Virtual Machine-HA for OpenStack 27/Oct/2015 Masahito Muroi, NTT
- 2. 2Copyright©2015 NTT corp. All Rights Reserved. What’s Masakari • In general context • まさかり (Masakari) is Japanese word for an “axe” or a “hatchet” • Used for cutting down trees, Not weapon • Trademark for 金太郎 (KINTARO) • Name of the Japanese fairy story and its main character’s name • In engineering context • “まさかりを投げる (masakari wo nageru)” • Roughly translated “Throwing a Masakari” • Meaning “point out a mistake in conferences or presentations” • In OpenStack context • Virtual Machine High Availability (VM-HA) service • Rescue Virtual Machine when any errors occur • Published as OSS at github https://github.com/ntt-sic/masakari Copyright © いらすとや. All Rights Reserved.
- 3. 3Copyright©2015 NTT corp. All Rights Reserved. Motivations • Pets vs Cattle • Unable to change all Apps to Cloud Native at once • Open Source
- 4. 4Copyright©2015 NTT corp. All Rights Reserved. Requirements for Pets Model • Detect 3 types of VM down • Unexpected VM down • VM manager down • Host down • Recover VM within 10 mins • Work automatically
- 5. 5Copyright©2015 NTT corp. All Rights Reserved. Architecture Overview ComputeNodesControllerNodes &BackendNodes
- 6. 6Copyright©2015 NTT corp. All Rights Reserved. How to detect the 3 down • VM down • monitoring libvert’s events • Manager Process down • Monitoring manager process • Host down • Using Pacemaker
- 7. 7Copyright©2015 NTT corp. All Rights Reserved. Detect VM Down Libvirt Masakari 1. Notify down VM’s Info (VM-ID, Host Name, etc.) Libvirt Monitor Detect VM down VM1 VM2 VM3 Libvirt Libvirt Monitor VM5 VM6 HostHost Nova 2. Call Rebuild API for the down VM 3. Rebuild the VM Down
- 8. 8Copyright©2015 NTT corp. All Rights Reserved. Manager Process Down 1. Restart manager process when it’s down Process Monitor Masakari 2. Notify manager process down if fail to restart few times Libvirt Nova-compute Host A Libvirt Nova-compute Host B Nova 3. Notify Nova to disable schedule for Host A Process Monitor Down
- 9. 9Copyright©2015 NTT corp. All Rights Reserved. Host Down RA CIB RA RA Node’s Status pacemaker Heartbeat communications Masakari Check its Host’s status 1. Notify another host down Start Stop Monitor WatchDog& Shutdowner Host Fail Monitor Polling RA CIB RA RA Node’s Status pacemaker Start Stop Monitor WatchDog& Shutdowner Host Fail Monitor Polling Down Host A Host B Nova 2. Call Evacuate API for all VM on Host B
- 10. 10Copyright©2015 NTT corp. All Rights Reserved. How to use Masakari 1. Prerequisites • Set up Nova and Compute Nodes with KVM • Set up a shared storage per cluster for ephemeral disks (e.g. NFS) 2. Install and Configure Masakari • Download source from github • https://github.com/ntt-sic/masakari • Install Masakari’s package • Initialize Masakari’s DB • Configure 4 Masakari’s config files 3. Start Masakari • Start all process • Add a reserved host prepared for host down 4. Wait any error • Masakari only works when any error occurs
- 11. 11Copyright©2015 NTT corp. All Rights Reserved. Challenges • No branch from OpenStack master
- 12. 12Copyright©2015 NTT corp. All Rights Reserved. Other session related to Masakari • Korejanai Story: How To Integrate OpenStack Into Your Business Strategy (http://sched.co/49wG)
- 13. 13Copyright©2015 NTT corp. All Rights Reserved. Github: https://github.com/ntt-sic/masakari Mail: muroi.masahito@lab.ntt.co.jp Market Place: S14 NTT Group
Notas del editor
- Masakari has many kind of meaning depending on its context. First of all, I explain how we use the phrase ‘Masakari’ in our life. Generally speaking, Masakari reminds us of ‘axe’ and/or KINTARO. KINTARO is a name of the Japanese fairy story and of its main character name. In engineering context, we use phrase ‘まさかりをなげる’. Roughly translated “Throwing a Masakari” This means “Point out a mistake in conferences or in their presentations.” Especially, it focuses on technically mistakes. Finally, in OpenStack context “Masakari” means Virtual Machine High Availability service NTT developed. This service rescues Virtual Machines when any errors occur for these. This service is now available in Github. Check it out after this presentation. Now, you’ve learned meaning of Masakari in OpenStack context, so it’s a good time to go.
- We had 3 motivations for developing Masakari. First of all, to enable pet type Virtual Machines & Application to work on OpenStack. As you know pets vs cattle issue is under discussion long time in the community. Ideally speaking from developer perspective, when we replace our Infra with OpenStack, the app on OpenStack should be cloud native application, which means that we should change App and the Infra at once. However, in general it’s hard to accomplish because of their budget, release time or any reason. We’ve developed Virtual Machine HA to change each app on OpenStack to cloud native step by step, even though we understand a bad way to introduce pets model to cloud. That’s why we named this HA ‘Masakri’ we use in engineering context, which means ‘point out a mistake of ourself’. Finally, we wanted to make‘Masakari’ open. We’re deploying OpenStack in production, so we’d like to volunteer OpenStack in any way. We think making “Masakari” open is one of our contribution. From next slides, I’ll show you quick overview of ‘Masakari’.
- We had 3 kind of requirements for Masakari. 1. Detect 3 types of VM down 2. Recover VM within few minutes. 3. Of course, this recovering works automatically
- This is quick architecture overview of Masakari. Masakari is roughly divided to 2 parts. One is Masakari controller presented in light blue box at top of the slide. Another is state monitoring processes displayed in the boxes at bottom of the slide. The controller process is in charge of calling OpenStack API depending on the type of notification from monitoring processes. The monitoring processes are monitoring whether each type of error Masakari want to detect occurs or not. In following slides, I’ll present you how each monitoring process is monitoring different errors.
- As I mentioned before, the monitoring processes detect 3 types down. These are ways to detect failures. For detecting VM down, Masakari hooks libvirt’s event which is sent from libvirt. For detecting manager process down, Masakari monitors whether manager processes works well or not. For detecting host down, Masakari uses pacemaker.
- I show you a quick instruction of Masakari. Before setting up Masakari, there are 2 prerequisites, Masakari assumes Compute Node uses KVM as its virtualizing technology and shares storages for ephemeral disks, NFS or ceph. 2.
- Masakari doesn’t require its user to modify OpenStack. It means everyone can start using Masakari into their OpenStack cloud. The reason why we chose this way is that we’d like to upgrade OpenStack after new version of OpenStack is released. OpenStack improves its feature in each releases, so we’d like to use new features as possible as we can. Unfortunately, the more we change codes at one release, the more difficult we upgrade to new one. We tried this challenge and accomplished.
- Once again. Check the URL and send me if you have any question. And then we have display in Market place S14. Please ask us in next booth.