How to connect to PostgreSQL running in a docker container from outside?
To connect to PostgreSQL running in a Docker container from outside the container, you need to expose the PostgreSQL port and provide the necessary authentication credentials. Here are the steps:
When starting the PostgreSQL container, you need to expose the port that PostgreSQL is listening on. This can be done by specifying the
pflag followed by the host port and container port mappings. For example:
docker run -d -p 5432:5432 --name postgres postgres
This will start a new PostgreSQL container with the port mapping of
5432:5432, exposing PostgreSQL port 5432 to the host.
Once the container is running and the port is exposed, you can connect to PostgreSQL from outside the container using any PostgreSQL client such as
psql. The syntax is as follows:
psql -h <host> -p <port> -U <username> -d <database>
<host>is the IP address or hostname of the host running the container,
<port>is the host port that maps to the container port (5432 in our example),
<username>is the PostgreSQL username, and
<database>is the name of the PostgreSQL database.
For example, if the host IP address is
192.168.0.100and the PostgreSQL username is
postgres, you would run:
psql -h 192.168.0.100 -p 5432 -U postgres -d mydatabase
This will connect to the PostgreSQL server running in the Docker container, using the specified database and authentication credentials.
Note: By default, the
postgresuser does not have a password set. If you have set a password for the
postgresuser, you need to include the
-Wflag followed by the password when connecting to PostgreSQL. For example:
psql -h 192.168.0.100 -p 5432 -U postgres -W -d mydatabase
This will prompt you for the password before connecting to the PostgreSQL server.
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