Docker-compose environment variables

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滥情空心 2021-02-01 13:44

I am trying to setup a postgres container and want to setup the postgres login with:

POSTGRES_USER: docker
POSTGRES_PASSWORD: docker

So I have

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  • 2021-02-01 14:06

    I struggled with this for a while and wasn't having luck with the accepted answer, I finally got it to work by removing the container:

    docker-compose rm postgres
    

    And then the volume as well:

    docker volume rm myapp_postgres
    

    Then when I did a fresh docker-compose up I saw CREATE ROLE fly by, which I'm assuming is what was missed on the initial up.


    The reasons for this are elaborated on here, on the Git repo for the Docker official image for postgres.

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  • 2021-02-01 14:11

    Thanks to Bryan with the docker-compose exec containername env I have discovered that the need is also to delete volumes. Since for the docker-compose volume rm volumename you need to know the exact name it is easier just to delete all with:

    docker-compose down --volumes
    
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  • 2021-02-01 14:19

    I had a similar situation. Following the answer from @Greg, I did a docker-compose up, and it picked up the environment variable.

    Prior to that, I had just been using docker-compose run and it wasn't picking up the environment variable as proven by running docker-compose exec task env. Strangely, docker-compose run task env showed the environment variable I was expecting.

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  • 2021-02-01 14:20

    If you're using Docker.

    Try to check if your local DB is active because mostly it's conflicting with Docker, if so, you can deactivate it or uninstall it in order to avoid the conflict.

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  • 2021-02-01 14:25

    The authentication error you got would help a lot!

    I fired up the postgres image with your arguments:

    docker run --name db -d -e POSTGRES_PASSWORD=docker -e POSTGRES_USER=docker postgres
    

    Then I exec'ed in :

    docker exec -it db psql -U docker user
    psql: FATAL:  database "user" does not exist
    

    I get the error message you are expecting because I have trust authentication :

    docker exec -it db cat /var/lib/postgresql/data/pg_hba.conf | grep -v '^#'
    
    local   all             all                                     trust
    host    all             all             127.0.0.1/32            trust
    host    all             all             ::1/128                 trust
    host all all 0.0.0.0/0 md5
    

    To simulate your web container, I'll run another instance of the postgres container and link the db container and then connect back to the db container:

    core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker user
    Password for user docker: 
    psql: FATAL:  password authentication failed for user "docker"
    

    I get an authentication error if I enter the incorrect password. But, if I enter the correct password:

    core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker user
    Password for user docker: 
    psql: FATAL:  database "user" does not exist
    

    It all seems to be working correctly. I put it all in a yaml file and tested it that way as well:

    web:
      image: postgres
      command: sleep 999
      ports:
        - "62576:62576"
      links:
       - db
    db:
      image: postgres
      environment:
        POSTGRES_PASSWORD: docker
        POSTGRES_USER: docker
    

    then fired it up with docker-compose:

    core@ku1 /tmp/i $ docker-compose -f dc.yaml up
    Creating i_db_1...
    Creating i_web_1...
    Attaching to i_db_1, i_web_1
    db_1  | ok
    db_1  | creating template1 database in /var/lib/postgresql/data/base/1 ... ok
    db_1  | initializing pg_authid ... ok
    db_1  | initializing dependencies ... ok
    db_1  | creating system views ... ok
    db_1  | loading system objects' descriptions ... ok
    db_1  | creating collations ... ok
    db_1  | creating conversions ... ok
    db_1  | creating dictionaries ... ok
    db_1  | setting privileges on built-in objects ... ok
    db_1  | creating information schema ... ok
    db_1  | loading PL/pgSQL server-side language ... ok
    db_1  | vacuuming database template1 ... ok
    db_1  | copying template1 to template0 ... ok
    db_1  | copying template1 to postgres ... ok
    db_1  | syncing data to disk ... ok
    db_1  | 
    db_1  | WARNING: enabling "trust" authentication for local connections
    db_1  | You can change this by editing pg_hba.conf or using the option -A, or
    db_1  | --auth-local and --auth-host, the next time you run initdb.
    db_1  | 
    db_1  | Success. You can now start the database server using:
    db_1  | 
    db_1  |     postgres -D /var/lib/postgresql/data
    db_1  | or
    db_1  |     pg_ctl -D /var/lib/postgresql/data -l logfile start
    db_1  | 
    db_1  | 
    db_1  | PostgreSQL stand-alone backend 9.4.1
    db_1  | backend> statement: CREATE DATABASE "docker" ;
    db_1  | 
    db_1  | backend> 
    db_1  | 
    db_1  | PostgreSQL stand-alone backend 9.4.1
    db_1  | backend> statement: CREATE USER "docker" WITH SUPERUSER PASSWORD 'docker' ;
    db_1  | 
    db_1  | backend> 
    db_1  | LOG:  database system was shut down at 2015-04-12 22:01:12 UTC
    db_1  | LOG:  database system is ready to accept connections
    db_1  | LOG:  autovacuum launcher started
    ^Z
    [1]+  Stopped                 docker-compose -f dc.yaml up
    core@ku1 /tmp/i $ bg
    

    you can see that the user and password were created. I exec in:

    core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db user
    Password for user docker: 
    psql: FATAL:  password authentication failed for user "docker"
    core@ku1 /tmp/i $
    db_1  | FATAL:  password authentication failed for user "docker"
    db_1  | DETAIL:  Connection matched pg_hba.conf line 95: "host all all 0.0.0.0/0 md5"
    
    core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db user
    Password for user docker: 
    psql: FATAL:  database "user" does not exist
    db_1  | FATAL:  database "user" does not exist
    

    So the only thing I can think of is that you are trying to connect to the database from your host, not the web container? Or your web container is not using the 'db' as the host to connect to? Your definition for the web container does not contain any errors that I can see.

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  • 2021-02-01 14:25

    This helped me

    docker stop $(docker ps -qa) && docker system prune -af --volumes && docker compose up
    
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