I've setup a cluster on AWS ECS, it's hosting nginx and a webapp.
I've used these commands to create my resources
aws ecr create-repository --repository-name <repo-name> ecs-cli configure --cluster <cluster-name> --region eu-west-3 --config-name <conf-name> --cfn-stack-name <stack-name> --default-launch-type EC2 ecs-cli up --keypair <keypair> --capability-iam --size 1 --instance-type t2.medium --cluster-config <conf-name> docker-compose build docker-compose push ecs-cli compose up --cluster-config <conf-name>
I've also setup a service in that cluster connected to the task created above.
My goal is to be able to push the docker images (That already works) and then use some command to get ECS to fetch the new images and load them up (this is where I'm stuck). I have to do this through the CLI since I want to automate this later on.
My question is: Should I just delete the running task so that the service will replace it? This works if I do it in the AWS Management console. But it causes downtime of my webservice.
Another options is to use the command below which I found here:
aws ecs update-service --cluster <cluster name> --service <service name> --force-new-deployment
However, when I run that command I get this error:
EVENTS 2021-04-21T05:32:45.842000-07:00 2c47e2c0-3a76-4dc1-bfef-21392b65871b (service <service-name>) was unable to place a task because no container instance met all of its requirements. The closest matching (container-instance 25785de8f80041e0afd7b0adfda5f2fa) is already using a port required by your task. For more information, see the Troubleshooting section of the Amazon ECS Developer Guide. EVENTS 2021-04-21T05:29:11.592000-07:00 4279fb7c-9c36-477b-acb3-173edb8e2c31 (service <service-name>) has reached a steady state.
I'm guessing it can't create another EC2 instance because I've set the number of instances to 1 on creation of my cluster. But I tried with 2 instances and it seems overkill to have two instances up and running all the time. How can I achieve this?