VM-HA with CloudStack and Linstor, Rene Peinthor
0 likes•173 views
The document outlines the integration of high availability (HA) for virtual machines (VMs) using CloudStack and Linstor, focusing on building storage from generic Linux nodes and supporting various storage management technologies like LVM and ZFS. It discusses CloudStack's versions and their supported features related to VM and host HA, along with the requirements for quorum in clusters. Lastly, it includes commands and settings for configuring Linstor VM-HA and provides a live demo of the setup.
VM-HA with CloudStack and Linstor, Rene Peinthor
- 1. VM-HA with CloudStack and Linstor Rene Peinthor, LINBIT 1
- 2. 2 LINSTOR - goals • storage build from generic Linux nodes • for SDS consumers (Cloudstack, K8s, OpenNebula, ...) • building on existing Linux storage components • LVM, thin LVM or ZFS for volume management • deployment architectures • distinct storage nodes • hyperconverged with hypervisors / container hosts • Open Source, GPL
- 4. 4
- 5. 5 CloudStack Support ● 4.17 ○ Volume snapshots ○ Live migrate ● 4.18 ○ IOPS QoS ○ Backup snapshots ● 4.19 ○ Backup snapshots ○ VM snapshots (without memory) ○ HA support
- 6. 6 CloudStack VM High Availability +
- 7. 7 VM HA or Host HA? ● VM HA with Linstor and DRBD (3 nodes) ● Host HA ○ Out-of-band management ○ Fencing
- 8. 8 DRBD quorum ● 3 nodes minimum (3rd node can be diskless) ● No split-brain
- 9. 9 VM quorum settings ● on-no-quorum suspend-io; ● on-no-data-accessible suspend-io; Linstor commands: linstor rg sp DrbdOptions/auto-quorum suspend-io cloudstack linstor rg opt --on-no-data-accessible suspend-io cloudstack
- 10. 10 1. Host goes down (network or power) 2. Ping timeout 3. checkOnHostCommand to all cluster agents a. return: Host not responding b. return: Other hosts notify host is down 4. CloudStack declares: “Host is down” 5. HA VM restart scheduling starting CloudStack VM High Availability
- 11. 11 checkingHeartBeat(pool, host); Check local node? ● Parse drbdsetup events2 –now ○ Check if any resource that is primary and has promotion score 0 Check other node? ● Parse drbdsetup status –json ○ Check if local node has any connected resource to the other node
- 12. 12 Settings for Linstor VM-HA ● Compute->High Availability (Mostly for Host HA) ○ force.ha ● Hypervisor->KVM ○ kvm.ha.activity.check.interval ○ kvm.ha.activity.check.timeout ○ kvm.ha.degraded.max.period ○ … ● Miscellaneous->Others ○ wait !!! ● ping.interval ● ping.timeout