Otdfbt

My tasks are in PENDING status

That's what I can see in the events

There is not many information in the service events.

Here is the task definition in json

 "requiresAttributes": [
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.docker-remote-api.1.17",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.ecr-auth",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.task-iam-role",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.logging-driver.awslogs",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.task-iam-role-network-host",
 "targetId": null,
 "targetType": null
 ,
 
 "value": null,
 "name": "com.amazonaws.ecs.capability.docker-remote-api.1.19",
 "targetId": null,
 "targetType": null
 
 ],
 "taskDefinitionArn": "arn:aws:ecs:ap-southeast-2:1234567890:task-definition/SQ1-queuetest:1",
 "networkMode": "host",
 "status": "ACTIVE",
 "revision": 1,
 "taskRoleArn": "arn:aws:iam::1234567890:role/play-ecs",
 "containerDefinitions": [
 
 "volumesFrom": [],
 "memory": 256,
 "extraHosts": null,
 "dnsServers": null,
 "disableNetworking": null,
 "dnsSearchDomains": null,
 "portMappings": [],
 "hostname": null,
 "essential": true,
 "entryPoint": null,
 "mountPoints": [],
 "name": "sq1",
 "ulimits": null,
 "dockerSecurityOptions": null,
 "environment": [
 
 "name": "ENV",
 "value": "test"
 
 ],
 "links": null,
 "workingDirectory": "/app/src/",
 "readonlyRootFilesystem": null,
 "image": "1234567890.dkr.ecr.ap-southeast-2.amazonaws.com/simplequeue:latest",
 "command": [
 "python /app/src/main.py"
 ],
 "user": null,
 "dockerLabels": null,
 "logConfiguration": 
 "logDriver": "awslogs",
 "options": 
 "awslogs-group": "simplequeue",
 "awslogs-region": "ap-southeast-2",
 "awslogs-stream-prefix": "sq1"
 
 ,
 "cpu": 512,
 "privileged": null,
 "memoryReservation": null
 
 ],
 "placementConstraints": [],
 "volumes": [],
 "family": "SQ1-queuetest"

How can I find out more why the task is failing to start?

It seems to be due to the lack of policy AmazonEC2ContainerServiceforEC2Role.

After I assigned this policy to the role, I get a different error message now:

service SQ1-test was unable to place a task because no container
instance met all of its requirements. The closest matching
container-instance efea641c-6204-4a68-a69f-cb1b07e3529a encountered
error "AGENT". For more information, see the Troubleshooting section.

It turns out the above error is caused by an inadvertent removal of the role ecsInstanceRole which was created when a cluster was being created.

Now I can see the status is turned to 'PENDING'