ECS 'Unknown volume' error


I am trying to get our app to deploy to ECS thru pipelines, but do not understand how to take care of the following error


+ python task_definition.json $DOCKER_IMAGE:$TAG 1 0 200 Failed to update the stack. An error occurred (ClientException) when calling the RegisterTaskDefinition operation: Unknown volume 'etc'.


Here is what I have in my container definition for mount points


"mountPoints": [{
  "containerPath": "/home/app/etc",
  "sourceVolume": "etc",
  "readOnly": false

I am following this example

How do I make it aware of the volume? 


1 answer

0 vote

looks like your task definition contains a mountPoint but no volumes (to be mounted); see the example at


      "family": "web-timer",
      "containerDefinitions": [
              "name": "web",
              "image": "nginx",
              "cpu": 99,
              "memory": 100,
              "portMappings": [{
                      "containerPort": 80,
                      "hostPort": 80
              "essential": true,
              "mountPoints": [{
                      "sourceVolume": "webdata",
                      "containerPath": "/usr/share/nginx/html",
                      "readOnly": true
      }, {
              "name": "timer",
              "image": "busybox",
              "cpu": 10,
              "memory": 20,
              "entryPoint": ["sh", "-c"],
              "command": ["while true; do date > /nginx/index.html; sleep 1; done"],
              "mountPoints": [{
                      "sourceVolume": "webdata",
                      "containerPath": "/nginx/"
      "volumes": [{
              "name": "webdata",
              "host": {
                      "sourcePath": "/ecs/webdata"

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