TIL how to run postgresql in docker and persist the database

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Today I needed a postgres database for development that persisted its data when recreating the container. That’s not docker’s default behaviour, but docker volumes to the rescue! This is the command to run a postgres container that persist it’s data in /var/yourpgdata: docker run \ --name pgresql \ -d \ -p 5432:5432 \ -e POSTGRES_USER=yourpguser \ -e POSTGRES_PASSWORD=yourpgpass \ -e POSTGRES_DB=yourpgdb \ -v /var/yourpgdata:/var/lib/postgresql/data Fine… but what does this mean? Let me explain: