Clustered Libvirt, simplified.
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README.md |
clustvirt - Libvirt cluster manager
Clustered virtualization has gotten to complicated. We have a great system for it built into the Linux kernel, with shared software stacks between whatever base distro you want to use.
Every other option has buy in, and buzzwords. I want something truly simple that can manage virtual machines on multiple hosts, integrating with existing tools, running from one/all of the hosts, a raspberry pi, or as a guest machine on the cluster itself.
The mission: Talk to libvirt hosts, coordinate them, manage them, and let people take their clusters back.
Overall goals:
- HA Cluster resource manager (simpler then existing options, just for libvirt)
- Share secrets
- Share VM configs
- know what VM is running on what cluster host
- trigger migrations of hosts
- most simple quorum algorithm possible, ability to run 2 hosts reliably, up to ?? hosts without worry
- Shared Network management
- Shared storage managment
- Does not include clustered storage configuration
- Can use different clustered storage systems (just not configure them directly)
- Reliable backup and snapshotting
- The tools exist for this, just needs to be exposed
- Install on any libvirt system, as long as the basic requirements are met as far as compatibility is concerned
- Should be able to have hosts on RedHat, Rocky, Arch, Ubuntu, Debian, whatever without worry
- Cloud-init configuration help to create useful and reusable cloud-init files, that don't need to be used by the system only. It's a standard, use it.
Existing tools and libraries to use
- [https://pkg.go.dev/libvirt.org/go/libvirt] Go Bindings for libvirt
- Not sure if it can be used without libvirt existing on the system it's running on. Worth a try.
Roadmap
- Create simple daemon that can run on 1 or more hosts that will keep track of things
- Libvirt daemon
- Host Capabilities
- Migration Capabilities
- Secret management
- Storage pool management
- Volume management
- Guest management
- Connection management (to other libvirt hosts)
- Create a simple WebUI with HTMX to monitor that stuff
- Add the ability to manage that stuff once we can monitor it, through the WebUI.