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Postgres Cheatsheet

This is a collection of the most common commands I run while administering Postgres databases. The variables shown between the open and closed tags, "<" and ">", should be replaced with a name you choose. Postgres has multiple shortcut functions, starting with a forward slash, "". Any SQL command that is not a shortcut, must end with a semicolon, ";". You can use the keyboard UP and DOWN keys to scroll the history of previous commands you've run.

Setup

installation, Ubuntu

http://www.postgresql.org/download/linux/ubuntu/ https://help.ubuntu.com/community/PostgreSQL

stefan-cross

Heap Dump from a K8s Pod

on pod:
jmap -dump:format=b,file=dump.hprof 1

from your machine:
kubectl exec -n application <pod-name> -- cat /dump.hprof > local_dump.hprof

stefan-cross

Remove Nodes in NotReady State
kubectl delete node $(kubectl get nodes | grep NotReady | awk '{print $1;}')

# kubectl cordon <node-name>
# kubectl drain <node-name> --force --ignore-daemonsets  --delete-emptydir-data
# kubectl delete node <node-name>