Matthew Stobbs 4ecf05bf82 Adding basic wrappers

- Wrapper for Host connection called Host
  - Allows for easier usage of the API
- Wrapper for Domains called GuestVM, which pulls VM information and allows
  other functionality in a better way

2024-03-10 20:32:11 -06:00

2.8 KiB

Raw Blame History

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
  - Simplest quorum: If the controller can't reach it, it's down.
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.

Special XMLNS definitions

Domain

xmlns:clustvirt="https://git.staur.ca/stobbsm/clustvirt"

<metadata>
    <clustvirt:data xmlns:clustvirt="https://git.staur.ca/stobbsm/clustvirt/">
        <clustvirt:created>true</clustvirt:created>
        <clustvirt:managed>true</clustvirt:managed>
        <clustvirt:currentHost>host01</clustvirt:currentHost>
        <clustvirt:origHost>host02</clustvirt:origHost>
        <clustvirt:baseGuest>rocky-9-base</clustvirt:baseGuest>
    </clustvirt:data>
</metadata>