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# generala
adamant-kite-43734
08/26/2022, 10:22 AMThis message was deleted.
h
hundreds-evening-84071
08/26/2022, 1:18 PMI have never done what you list here; i.e. shutdown all 3 nodes at the same time. From what I understand, 2 of the 3 nodes need to remain online for HA.
However, to troubleshoot, what happens in your setup if you only shutdown node A? Does
kubectl get nodesw
wonderful-baker-81666
08/26/2022, 2:24 PMHow about creating a Vagrantfile for this scenario?
c
chilly-caravan-31853
08/29/2022, 3:37 AM2 of the 3 nodes need to remain online for HA.That's interesting. Is it documented? I had experimented with a HA setup of 2 nodes with a PostgreSQL datastore, and it survived the loss of 1 node.
chilly-caravan-31853
08/29/2022, 3:42 AMwhat happens in your setup if you only shutdown node A?The cluster remains operational.
chilly-caravan-31853
08/29/2022, 8:50 AMIn https://rancher.com/docs/k3s/latest/en/installation/ha/ it says about two or more server nodes, and no info on the number of required nodes in https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/
h
hundreds-evening-84071
08/29/2022, 1:35 PMHonestly, I do not know where it is documented.
It is something I learned, couple of years ago, at one of the free Rancher training (now that has moved to community.suse.com).
So, over the years in HA clusters I have always done maintenance (OS patches etc) on one node at a time (where there are 3 nodes in a HA-cluster).
c
chilly-caravan-31853
08/30/2022, 4:42 AM@hundreds-evening-84071 OK, thank you, I'll just take it for granted.
h
hundreds-evening-84071
08/30/2022, 5:09 PMIn a way, you did the test I believe...
I mean: when you shutdown all 3 nodes and power on 2 of the 3 you have noticed issues
when you shutdown just 1 you do not notice any issues...
For more testing: you can shutdown 2 of the 3 and see what happens?
c
chilly-caravan-31853
08/31/2022, 7:47 AM@hundreds-evening-84071 when I shut down 2 nodes of the 3, I start getting the
apiserver not readychilly-caravan-31853
08/31/2022, 8:10 AMA cluster of 4 nodes survives the loss of 1 node but not the loss of 2 nodes. Does it not look strange?
chilly-caravan-31853
08/31/2022, 9:02 AMOTOH a 4-node cluster with a PostgreSQL datastore survives (more or less) the loss of 3 nodes, at least the API remains operational if you connect to the alive node.
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