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Kubernetes (often abbreviated k8s) is an open-source system for automating deployment, and management of applications running in containers. This page collects some notes/docs on the Kubernetes setup in the Foundation production environment.
Rebooting a worker node
To reboot a worker node, use kubectl drain, it will configure the worker node to no longer create new pods and move the existing pods to other workers. Draining the node will take 30-60 seconds.
# kubectl drain kubernetes1001.eqiad.wmnet # kubectl describe pods | grep Node Node: kubernetes1002.eqiad.wmnet/10.64.16.75 Node: kubernetes1002.eqiad.wmnet/10.64.16.75 Node: kubernetes1003.eqiad.wmnet/10.64.32.23 Node: kubernetes1003.eqiad.wmnet/10.64.32.23 Node: kubernetes1004.eqiad.wmnet/10.64.48.52
When the node has been rebooted, it can be configured to reaccept pods using kubectl uncordon, e.g.
# kubectl uncordon kubernetes1001.eqiad.wmnet
The pods are not rebalanced automatically, i.e. the rebooted node is free of pods initially.