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infrastructure-documentation/k8s-maintenance.md

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Disaster recovery and maintenance

When a machine or disk is scheduled for replacement.

  • kubectl drain hetzner05 # evacuate all the pods out of the node to be shutdown
  • kubectl taint nodes hetzner05 key1=value1:NoSchedule # prevent any pod from being created there (metallb speaker won't be drained, for instance)
  • kubectl delete node hetzner05 # let the cluster know it no longer exists so a new one by the same name can replace it

Routing the failover IP

When the machine to which the failover IP (failover.forgejo.org) is routed is unavailable or to be shutdown, to the Hetzner server panel, to the IPs tab and change the route of the failover IP to another node. All nodes are configured with the failover IP, there is nothing else to do.

Manual boot operations

On the machine that runs the NFS server

  • sudo drbdadm primary r1 # Switch the DRBD to primary
  • sudo mount /precious # DRBD volume shared via NFS
  • sudo ip addr add 10.53.101.100/24 dev enp5s0.4001 # add NFS server IP

On the other machines

  • sudo ip addr del 10.53.101.100/24 dev enp5s0.4001 # remove NFS server IP