Service container_name must be a mapping not a string

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Question

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 //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