Modifying postgres.conf inside Docker

1. Open a shell in Docker to change the configuration on a running container.

docker start timescaledb
docker exec -i -t timescaledb /bin/bash

1. Edit and then save the config file, modifying the setting for the desired configuration parameter (for example, max_wal_size).

vi /var/lib/postgresql/data/postgresql.conf

1. Restart the container so the config gets reloaded.

docker restart timescaledb

1. Test to see if the change worked.

    docker exec -it timescaledb psql -U postgres

    postgres=# show max_wal_size;
     max_wal_size
    --------------
    2GB