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# k3sa
adamant-kite-43734
02/15/2023, 12:01 PMThis message was deleted.
r
rich-cartoon-70161
02/15/2023, 1:29 PMTo run K3s in this mode, you must have an odd number of server nodes. We recommend starting with three nodes.rich-cartoon-70161
02/15/2023, 1:29 PMBecause the majority has to still be available, otherwise it’ll do what it’s doing in your setup.
rich-cartoon-70161
02/15/2023, 1:30 PMWith 3 control-plane nodes you can have 1 offline
l
loud-helmet-97067
02/15/2023, 2:20 PMThanks @rich-cartoon-70161 for the insights.
So i assume that setting 3rd master node with --etcd and --controlplane is enough to set and trigger HA behaviour with service up when 1 master node goes down.
Will check and confirm on this
r
rich-cartoon-70161
02/15/2023, 5:26 PMYes that should work.
l
loud-helmet-97067
02/16/2023, 1:17 AMNoted with thanks.
If we are to to use external datastore ( https://docs.k3s.io/installation/ha) , is appending --etcd --controlplane with --datastore-endpoint is enough? or external-datastore need to set separately
h
handsome-jewelry-34280
03/18/2023, 3:46 AMHi @loud-helmet-97067, where you able to resolver the correct way to pass the external datastore to a Rancher created K3S cluster?
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