Easiest Multi-host Replication Docker Container Solution?
reddit / selfhosted

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NateroniPizza · 2023-10-05 15:26

Hello, all,

Note: The HA aspect of this is all for the "warm fuzzies" that my
stuff will always be up, and for the fun of having redundant, reliable
infrastructure in my home. This is not a production environment that
anyone else uses.

I've got K3s with Traefik set up on my 3 Proxmox nodes with a couple
of containers in them. It's cool and all, but holy crap is it a PITA
to manage... not to mention the constant fear that anything could
break (given the extreme difficulty in figuring out how to get it
working, and getting past all the issues when setting up, I have 0
confidence in it ever working again if an update breaks it).  Also,
with as infrequently as I go in there, I forget how to set stuff up
each time given it's mostly commandline and config files.

I've currently got Portainer set up on one node with automatic
replication and HA at the Proxmox cluster level. However, I've run
into occasional issues with VMs not failing over properly in the past
(mostly from stuff that I've broken, but still would rather not rely
on it if I don't have to). I just found HAProxy with a nice GUI in
OPNsense (sure, a single point of failure, but if my router is down
I've got bigger problems), so realized load balancing/failover-capable
proxy is a real possibility without having to wade into config files
every time I want to tweak anything, so am looking into ways to
utilize this if possible.

**My question:**
What is the easiest way, without shared storage, to replicate docker
containers and their configuration changes between multiple docker
hosts? (very ideally under Portainer, or some other piece of software
with a pretty, easy-to-manage GUI) Example: If I make a change to the
item list in Heimdall or the DNS settings on PiHole, I would like for
those settings to be immediately synced out to the containers running
on the other Docker hosts.

Thank you