How to generate a Postgresql Dump from a Docker container?
Use the following command from a UNIX terminal:
docker exec <container_name> pg_dump <schema_name> > backupThe following command will dump only inserts from all tables:
docker exec <container_name> pg_dump --column-inserts --data-only <schema_name> > inserts.sql
I have container named postgres with mounted volume -v /backups:/backups
To backup gziped DB my_db I use:
docker exec postgres pg_dump -U postgres -F t my_db | gzip >/backups/my_db-$(date +%Y-%m-%d).tar.gzNow I have
user@my-server:/backups$ lsmy_db-2016-11-30.tar.gz
Although the mountpoint solution above looked promising, the following is the only solution that worked for me after multiple iterations:
docker run -it -e PGPASSWORD=my_password postgres:alpine pg_dump -h hostname -U my_user my_db > backup.sqlWhat was unique in my case: I have a password on the database that needs to be passed in; needed to pass in the tag (alpine); and finally the hosts version of the psql tools were different to the docker versions.