Using Docker to launch web app, can't connect to Postgresql DB?

Question

I received the following error when trying to write session data using Tomcat\'s PersistentManager to a Postgres DB running on my local machine:

SEVERE: A SQL e         


        

Answer 1

If you are using docker-compose together with postgres image, than you can reuse service name as IP inside jdbc connection (here: app-db)

  web:
    build: ./web
    ports:
      - "8080:8080"
    links:
      - app-db
    environment:
      - MYAPP_JDBC_URL=jdbc:postgresql://app-db:5432/somedb
      - MYAPP_JDBC_USER=someuser
      - MYAPP_JDBC_PASS=pass

  app-db:
    image: postgres:9.6
    environment:
      - POSTGRES_USER=someuser
      - POSTGRES_PASSWORD=pass
      - POSTGRES_DB=somedb
    expose:
      - 5432
    volumes_from:
      - app-db-data

  app-db-data:
    image: cogniteev/echo
    command: echo 'Data Container for PostgreSQL'
    volumes:
      - /opt/postgresdata/:/var/lib/postgresql/data