1. Running My First Docker Container

Activity 1.01: Pulling and Running the PostgreSQL Container Image from Docker Hub

Solution:

1. To start the Postgres Docker container, first determine what environment variables are required to set the default username and password credentials for the database. Reading through the official Docker Hub page, you can see that you have configuration options for the POSTGRES_USER and POSTGRES_PASSWORD environment variables. Pass the environment variables using the -e flag. The final command to start our Postgres Docker container will be as follows:

   docker run -itd -e "POSTGRES_USER=panoramic" -e "POSTGRES_PASSWORD=trekking" postgres:12

   Running this command will start the container.

2. Execute the docker ps command to verify that it is running and healthy:

   $ docker ps

   The command should return output like the following:

   CONTAINER ID  IMAGE         COMMAND                 CREATED
     STATUS              PORTS          ...