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1) I have taken a node in maintenance mode many times deliberately by launching second node and draining first. Its not an issue at all with just one node. For

1) I have taken a node in maintenance mode many times deliberately by launching second node and draining first. Its not an issue at all with just one node. For redundancy, is there ever a case where single node could go down in practice. Nodes are basically EC2 instance and they could run for years without going down. 2) 1 is odd and could win the election;)

jameshart 3y ago
EC2 instances can be rebooted at any time. The underlying hardware they are on fails from time to time and they get moved. Running three nodes is a rule of thumb, not a hard rule for minimally guaranteeing availability.
- YetAnotherNick 3y ago
  > EC2 instances can be rebooted at any time No, they can't be rebooted any time. Where are you getting this information from?
  - jameshart 3y ago
    https://repost.aws/knowledge-center/ec2-linux-degraded-hardware https://repost.aws/knowledge-center/ec2-linux-degraded-hardw... Note in particular: > For instances that launched from an Amazon EC2 Auto Scaling group, the instance termination and replacement occur immediately
    - YetAnotherNick 3y ago
      > Amazon EC2 also sends a notification in your email Interesting. I had seen EC2 instances running for multiple years and never saw this so I assumed that this isn't possible. I know for a fact that GCP has live migration where while the service would be degraded for few seconds, you don't need to do anything so I assumed AWS also had something similar.