How to generate a Postgresql Dump from a Docker container?
PostgresqlDockerContainersPostgresql Problem Overview
I would like to have a way to enter into the Postgresql container and get a data dump from it.
Postgresql Solutions
Solution 1 - Postgresql
Use the following command from a UNIX or a Windows terminal:
docker exec <container_name> pg_dump <schema_name> > backup
The following command will dump only inserts from all tables:
docker exec <container_name> pg_dump --column-inserts --data-only <schema_name> > inserts.sql
Solution 2 - Postgresql
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
Solution 3 - Postgresql
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.sql
What 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.
Solution 4 - Postgresql
Another workaround method is to start postgre sql with a mountpoint to the location of the dump in docker.
like docker run -v <location of the files>.
Then perform a docker inspect on the docker running container
docker inspect <image_id>
you can find "Volumes" tag inside and a corresponding location.Go to the location and you can find all the postgresql/mysql files.It worked for me.Let us know if that worked for you also.
Good luck
Solution 5 - Postgresql
This one, using container_name instead of database_scheme's one, works for me:
docker exec {container_name} pg_dump -U {user_name} > {backup_file_name}
In instance, for me, database name, user and password are supposed declared in docker-compose.yaml
I wish it could help someone
Solution 6 - Postgresql
for those who suffered with permissions, I used this following command with success to perform my dump:
docker exec -i MY_CONTAINER_NAME /bin/bash -c "PGPASSWORD=MY_PASSWORD pg_dump -Fc -h localhost -U postgres MY_DB_NAME" > /home/MY_USER/db-$(date +%d-%m-%y).backup
Solution 7 - Postgresql
This will mount the pwd and include your environment variables
docker run -it --rm \
--env-file <(env) \
-w /working \
--volume $(pwd):/working \
postgres:latest /usr/bin/pg_dump -Fc -h localhost -U postgres MY_DB_NAME" > /working/db-$(date +%d-%m-%y).backup
Solution 8 - Postgresql
To run the container that has the Postgres user and password, you need to have preconfigured variables as container environment variable. For example:
docker run -it --rm --link <container_name>:<data_container_name> -e POSTGRES_PASSWORD=<password> postgres /usr/bin/pg_dump -h <data_container_name> -d <database_name> -U <postgres_username> > dump.sql