Service container_name must be a mapping not a string

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Defines two web services, web and redis

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This Content is from Stack Overflow. Question asked by natukita

When I ran: docker-compose up -d, I got error saying

“ERROR: In file ‘./docker-compose.yml’, service ‘container_name’ must be a mapping not a string.”

This is my yml file:

version'3' services:
    web:
    container_name: nginx1
    ports:
             - "8080:80"
    image: nginx

~

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Question

Hi, I am trying to use the example provided in the site https://docs.docker.com/compose/gettingstarted/

Step 3: Define services Define a set of services using docker-compose.yml:

Create a file called docker-compose.yml in your project directory and add the following:

version: '2'
services:
  web:
    build: .
    ports:
     - "5000:5000"
    volumes:
     - .:/code
    depends_on:
     - redis
  redis:
    image: redis

and when I run the command docker-compose up i got the below error

ERROR: yaml.scanner.ScannerError: while scanning for the next token found character ‘\t’ that cannot start any token in “./docker-compose.yml”, line 18, column 1 so i removed all spaces and modified it as below

Defines two web services, web and redis

version: ‘2’ services: web: build: . #Build from the dockerfile from current dir ports:

“5000:5000” #Forward the exposed port 5000 on the container to port 5000 on the host machine volumes:
.:/code #Mounts the project directory on the host to /code inside the container directory allowing you to modify the code without having to rebuild the image depends_on:
redis redis: image: redis #Links the webservice to the redis service

on trying it again i am getting an error now as

docker-compose up ERROR: In file ‘./docker-compose.yml’, service must be a mapping, not a NoneType.

Can I get some help what is wrong here… I am using MAC.

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I'm getting issue when running docker-compose.yml file and below is the script written in the file

version: '3.3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:

Below is my error:

ERROR: In file './docker-compose.yml', service 'image' must be a mapping not a string.

Please help.

I want to use the existing network "nextcloudpi":

$ sudo docker network ls
NETWORK ID     NAME                               DRIVER    SCOPE
bc60ac79af99   bridge                             bridge    local
e374ccc22ff4   host                               host      local
6822ac7b54c6   ncp_reverse_proxy_bc_nextcloudpi   bridge    local
dc749eca4598   ncp_reverse_proxy_nextcloudpi      bridge    local
6a83b3f6e623   nextcloudpi                        bridge    local
eeb4fc6c4f16   none                               null      local
79949d81c193   overleaf_default                   bridge    local

I get the error:

In file './docker-compose.yml', service 'networks' must be a mapping not an array

version: '2.2'


networks:
  nextcloudpi:
    external: true


services:
    sharelatex:
        restart: always
        # Server Pro users:
        # image: quay.io/sharelatex/sharelatex-pro
        image: sharelatex/sharelatex
        container_name: sharelatex
        depends_on:
            mongo:
                condition: service_healthy
            redis:
                condition: service_started
        ports:
            - 83:80
        links:
            - mongo
            - redis
        networks:
           - nextcloudpi

asked Jul 4 at 15:36

2

This file is working as expected:

version: '2.2'
  

services:
    sharelatex:
        restart: always
        # Server Pro users:
        # image: quay.io/sharelatex/sharelatex-pro
        image: sharelatex/sharelatex
        container_name: sharelatex
        depends_on:
            mongo:
                condition: service_healthy
            redis:
                condition: service_started
        ports:
            - 83:80
        links:
            - mongo
            - redis
        

networks:
  default:
    name: nextcloudpi
    external: true

answered Jul 5 at 9:36

service container_name mapping string

Service container_name must be a mapping not a string

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Defines two web services, web and redis

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