CODEWITHSUNDEEP
amazon-web-servicesdockeramazon-ec2
Or Betzalel
Or Betzalel

Reputation: 2597

AWS redeploy a docker after update

I have an aws ec2 cluster with a service that runs a task. Let's say the task's image is my-app:latest

When I want to update the application I build a new docker image and push it to the ECR.

Now, how do I roll the new my-app:latest image to my instances?

Upvotes: 1

Views: 249

Answers (1)

Adiii
Adiii

Reputation: 59966

Updating the Docker image involves two approaches

First one, only update docker image and push to ECR without modifying the tag that isaws.abc/myimage:latest, so, in this case, you do not need to update the task definition you just need to redeploy the service. you can do from AWS console or from aws cli

aws ecs update-service --cluster ec2cluster_name --service service_name --force-new-deployment

This all you need,

The second one, if you use different docker image tag then you also need to update task definition that will point to the new Docker image and redeploy the service.

Register new version of the task definition

Now specify the task definition revision. rest of the thing will be the same except the docker image tag.

{
  "containerDefinitions": [
  {
    "cpu": 0,
    "logConfiguration": {
      "logDriver": "awslogs",
      "options": {
        "awslogs-group": "/ecs/stage-app",
        "awslogs-region": "us-west-2",
        "awslogs-stream-prefix": "ecs"
  }
},
    "environment": [
      {
        "name": "BRANCH",
         "value":"staging"
      },
      {
        "name": "NODE_ENV",
        "value": "staging"
      }
    ],


    "memoryReservation": 400,

  "ulimits": [
    {
        "name": "nofile",
        "softLimit": 4000,
        "hardLimit": 4000
    }
],
    "image": "***.dkr.ecr.us-west-2.amazonaws.com/stage:stage",
    "dockerLabels": {
      "Name": "stage-app"
    },
    "privileged": true,
    "name": "stage-app"
  }
],

"family": "stage-app"
}

Register this revision

aws ecs register-task-definition --cli-input-json file://stage-nodejs.json

update the service with the new task definition

 aws ecs update-service --cluster cluster_name --service service_name --task-definition task_definition_name

redeploy the service

aws ecs update-service --cluster ec2cluster_name --service service_name --force-new-deployment

Upvotes: 2

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