2y ago

HA redundancy options

I'm currently running HA on a Pi3... it works fine, but it's now a single point of failure.

I have some new hardware arriving to run VMs in and was intending to move HA to it, but now I'm wondering if I can have HA in 2 places for fault tolerance.

I'm aware that there's no built-in failover options, but has anyone done something similar?

17 comments

You may wanna look at Kubernetes. It’s basically docker with failover.
- Correct, OPs needs is describing what kubernetes was made for. Fault tolerant container orchestration. Or any other orchestration framework.
  However it's a best to learn and get set up. Migrating all of my containers over took a couple of months of learning and trial and error. Each person has to decide is that level of effort worth it in a home application
  
  Ok, but that's assuming >1 host can be managed that way... can I manage HA on the Pi3 as a backup to my new host with Kubernetes?
  Edit: can Proxmox do this too?
I run HA as a container in a vm. I back HA data up nightly and the compose script for running HA is archived on github. If the vm dies there is another vm that can bring it back up. If the host dies (I have a pool of xenserver (xcp-ng) hosts, so it would be a major domestic disaster if they all croaked) I have a fallback to run HA on docker on wsl. If the house burns down all the scripts are on GitHub and the backups get sent to Azure monthly. I think I’m covered.
- Ok, yep, if the house burns down (been there, done that), HA is priority 0.
  But good point about the offsite backup + compose, I hadn't considered that - thanks.
  Interesting that you're using a container inside a VM... is that just because you're using a VM-only hypervisor (ie Xen) or was there another reason?
  I've heard good things about Proxmox, but no idea if it has a container / VM watchdog function.
  
  Yeah is type 1. But it pools supports network storage and is free, and I know how to use it.
If you succeed, how do you plan to handle ZigBee or Zwave connections? I'm a bit unhappy with my ZigBee dongle remaining a single point of failure.
- I don't have any zigbee devices at the moment, but I was looking into network based ones... not sure if I can have 2 of those? (Again, no zigbee expirence yet to know the options)
  Best Zigbee Coordinators for Home Assistant 2023
  
  From everything I've seen, the networked ones are never recommended over USB dongles.
HA might be possible in a active passive configuration if you don't have any dependencies on external hardware like a zigbee stick. Active active would need support by HA and I don't think that is implemented.
I think the most secure thing is to keep regular backups so you can roll back easily.
- Thanks, yes, I think active-active would be another magnitude harder... and would need database, history, etc on shared storage... over the top to jist ensure the lights stay on.
  And backups are essential for all use cases (and not just the built-in HA backup left on the device / VM / container that just failed!)
  Thanks

17 comments