Updating Task Definitions in ECS

Question

I'm currently trying to automate my build and deployment process through CodePipeline. After my code finishes building in codebuild, I want to update my task definition and update my service through the aws cli via CodeBuild.

I'm having a problem with updating the service because there's no way for me to keep track of the revision number. Is there a way to let the updated service know to use the latest revision? I know that you can specify a json, but how can I manipulate the revision number so that the service points to the right image in my registry?

Answer 1

Reading a little the documentation of the api of Amazon, does not tell you which is the last image that was uploaded. I recommend that in the process of upload captures the version to be able to set it in the service.

I leave you the response of the api when you list the images.

Response syntax:

{
   "imageIds": [ 
      { 
         "imageDigest": "string",
         "imageTag": "string"
      }
   ],
   "nextToken": "string"
}

A possible process can be:

• Obtain the tag of your repo:

TAG=$(git describe --always)

• Build the image with this tag:

docker build . -t [acount].dkr.ecr.[zone].amazonaws.com/[app]:TAG

• Push the image:

docker push [acount].dkr.ecr.[zone].amazonaws.com/[app]:TAG

• Update the task with the image:

• Update the service with the task

Hope this can help you