如何使docker容器可访问postgres.app数据库？

Question

I got postgres.app running locally on my Mac and would like my local docker container to be able to connect to it. How do I best do this?

I found this post that suggests to pass the Docker host's IP address to a container using the --add-host flag ( Host port with DB to Docker container ). However, my laptop's IP address changes frequently. Isn't there an easier way of doing this? Isn't there an easy way to open a local port to a container?

Answer 1

Few things

• Use docker.for.mac.localhost as your HOST (This assumes you have the latest Docker for Mac as @Pete mentioned)
• Make sure there is such a record in ~/Library/Application Support/Postgres/var-9.6/pg_hba.conf

host all all 0.0.0.0/0 trust

• Change this line listen_addresses = 'localhost' in ~/Library/Application Support/Postgres/var-9.6/postgresql.conf

to

listen_addresses = '*'

or

listen_addresses = 'localhost, docker.for.mac.localhost'

Answer 2

If we are talking about a developers workstations, you could start your Docker Container inside the Host Network.

docker run --net=host myContainer

So your container runs in the same stack as your Host, and should be able to access your postgres.app.

Answer 3

From your container, try connecting to hostname docker.for.mac.localhost . For example:

psql -U my_user docker.for.mac.localhost -U my_user my_database

From the docs :

The Mac has a changing IP address (or none if you have no network access). From 17.06 onwards our recommendation is to connect to the special Mac-only DNS name docker.for.mac.localhost which will resolve to the internal IP address used by the host.

Note: this requires Docker for Mac >= 17.06.0-ce-mac18, 2017-06-28