How to create user in mongodb with docker-compose

Question

I\'m trying to create some kind of script that will create a docker with mongodb and automatically create a user.

I can usually manage my docker images with docker-c

Answer 1

For initializing mongo with initial user-password-db triple and initdb scripts with only one docker-compose.yml, without any extra configuration, you can use bitnami/mongo image.

In my case, I didn't run my scripts under /docker-entrypoint-initdb.d directory in the container after setting environment variables; MONGODB_USERNAME and MONGODB_PASSWORD (specific env variables for bitnami image) because mongod runs with --auth option automatically when you set these variables. Consequently, I got authentication errors when the container was in the process of executing the scripts.

Because, it was connecting to: mongodb://192.168.192.2:27017/compressors=disabled&gssapiServiceName=mongodb

TERMINAL LOG OF THE ERROR

FIRST DOCKER-COMPOSE FILE:

version: "3"
services:
mongodb:
    container_name: mongodb
    image: 'docker.io/bitnami/mongodb:4.2-debian-10'
    ports:
        - "27017:27017"
    volumes:
        - "mongodb_data:/bitnami/mongodb"
        - "./mongodb/scripts:/docker-entrypoint-initdb.d"
    environment:
        - MONGODB_INITSCRIPTS_DIR=/docker-entrypoint-initdb.d
        - MONGODB_USERNAME=some_username
        - MONGODB_PASSWORD=some_password
        - MONGODB_DATABASE=some_db_name
    networks:
        backend:
    restart: unless-stopped
volumes:
    mongodb_data:
networks:
    backend:
        driver: bridge

INIT JS FILE UNDER ./mongodb/scripts PATH:

let db = connect("localhost:27017/some_db_name");
db.auth("some_username", "some_password");
let collections = db.getCollectionNames();
let storeFound = false; 
let index;
for(index=0; index

So, I decided to add new environment variables to my docker-compose.yml after inspecting https://github.com/bitnami/bitnami-docker-mongodb/blob/master/4.2/debian-10/rootfs/opt/bitnami/scripts/libmongodb.sh file.

In this sh file, there is function like mongodb_custom_init_scripts() for executing the scripts. For executing all script files, it runs mongodb_execute() method. In this method, after mongod instance is up and run, mongo client is connecting to the mongod instance by using some parameters.

########################
# Execute an arbitrary query/queries against the running MongoDB service
# Stdin:
#   Query/queries to execute
# Arguments:
#   $1 - User to run queries
#   $2 - Password
#   $3 - Database where to run the queries
#   $4 - Host (default to result of get_mongo_hostname function)
#   $5 - Port (default $MONGODB_PORT_NUMBER)
#   $6 - Extra arguments (default $MONGODB_CLIENT_EXTRA_FLAGS)
# Returns:
#   None
########################
mongodb_execute() {
    local -r user="${1:-}"
    local -r password="${2:-}"
    local -r database="${3:-}"
    local -r host="${4:-$(get_mongo_hostname)}"
    local -r port="${5:-$MONGODB_PORT_NUMBER}"
    local -r extra_args="${6:-$MONGODB_CLIENT_EXTRA_FLAGS}"
    local result
    local final_user="$user"
    # If password is empty it means no auth, do not specify user
    [[ -z "$password" ]] && final_user=""

    local -a args=("--host" "$host" "--port" "$port")
    [[ -n "$final_user" ]] && args+=("-u" "$final_user")
    [[ -n "$password" ]] && args+=("-p" "$password")
    [[ -n "$extra_args" ]] && args+=($extra_args)
    [[ -n "$database" ]] && args+=("$database")

    "$MONGODB_BIN_DIR/mongo" "${args[@]}"
}

After that I added new environment variables to my docker-compose like MONGODB_ADVERTISED_HOSTNAME, MONGODB_PORT_NUMBER, and, MONGODB_CLIENT_EXTRA_FLAGS

So my final docker-compose.yml looks like:

version: "3"
services:
mongodb:
    container_name: mongodb
    image: 'docker.io/bitnami/mongodb:4.2-debian-10'
    ports:
        - "27017:27017"
    volumes:
        - "mongodb_data:/bitnami/mongodb"
        - "./mongodb/scripts:/docker-entrypoint-initdb.d"
    environment:
        - MONGODB_INITSCRIPTS_DIR=/docker-entrypoint-initdb.d
        - MONGODB_USERNAME=some_username
        - MONGODB_PASSWORD=some_password
        - MONGODB_DATABASE=some_db_name
        - MONGODB_ADVERTISED_HOSTNAME=localhost
        - MONGODB_PORT_NUMBER=27017
        - MONGODB_CLIENT_EXTRA_FLAGS=--authenticationDatabase=some_db_name
    networks:
        backend:
    restart: unless-stopped
volumes:
    mongodb_data:
networks:
    backend:
        driver: bridge

Now, it was connecting by this url:

mongodb://localhost:27017/?authSource=some_db_name&compressors=disabled &gssapiServiceName=mongodb