How to generate a Postgresql Dump from a Docker container?

Question

I would like to have a way to enter into the Postgresql container and get a data dump from it.

Answer 1

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.gz

Now I have

user@my-server:/backups$ ls
my_db-2016-11-30.tar.gz