Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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That is fine for training purposes, but not for real hosting. You typically don't guard against software crashes, but against hardware failures/outages. And this it not given with all three nodes on the same physical system.
In that case you can simply skip the HA setup and go with a single node. Or not use k8s at all and just manage containers using ansible and systemd or whatever.