Docker-Compose file has yaml.scanner.ScannerError

docker yaml docker-compose dockerfile
Skeffington picture Skeffington · Aug 22, 2016 · Viewed 75.4k times · Source

compose.yml file, which looks like this:

version: '2'
services:
  discovery-microservice:
    build: discovery-microservice
      context: /discovery-microservice/target/docker
      dockerfile: Dockerfile
  ports:
   - "8761:8761"

While I am executing it I get the following error:

yaml.scanner.ScannerError: mapping values are not allowed here
in "C:\...\docker-compose.yml", line 5, column 14

From what I see, nothing is wrong with the format, e.g. whitespaces missing. My overall goal is to specify a development mode docker-compose file, pointing it to the target directories from the different modules.
What am I doing wrong here?

Answer

virtuvious picture virtuvious · Aug 15, 2017

Ok, I wasted around 3 hours to debug a similar issue.

If you guys ever get the below error

ERROR: yaml.scanner.ScannerError: mapping values are not allowed here
in ".\docker-compose.yml", line 2, column 9

Its because you need a space is needed between

version:'3' <-- this is wrong

version: '3' <-- this is correct.

Also, if you are using eclipse, do yourself a favor and install YEdit YAML editor plugin

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