CODEWITHSUNDEEP
dockeramazon-ecs
Anthony Kong
Anthony Kong

Reputation: 40634

Command in task definition causes exception

Originally in a Dockerfile I use 

 CMD python /app/src/main.py

to start a process in my docker container. It works as expected.

I am now in the process of deploying these docker images to the aws ecs.

I want to move this CMD out of the Dockerfile and put it as part of the task definition, because I suppose it will offer me more flexibility.

enter image description here

However when the docker container is spinned up, it emits this exception:

container_linux.go:247: starting container process caused "exec: \"python
/app/src/main.py\": stat python /app/src/main.py: no such file or directory"

Apparently ecs treats the CMD parameter as if it refers to a single file.

I have tried to define the command as a list i.e. ["python", " /app/src/main.py"] but it just raised a different error: container_linux.go:247: starting container process caused "exec: \"[\\\"python\\\"\": executable file not found in $PATH"

Upvotes: 4

Views: 1894

Answers (2)

fravolt
fravolt

Reputation: 3001

We are using Terraform, where the task definition was defined in JSON format. There, command is a JSON array, containing each part of the command as an element:

{
  ...,
  "command" : ["python3", "/app/src/main.py"],
}

Upvotes: 0

Anthony Kong
Anthony Kong

Reputation: 40634

I need to put the command as a comma delimited string i.e.

python,/app/src/main.py

Upvotes: 7

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