There are two types of ECS instances: automatically created and manually added.
- Automatically created ECS instances are created by the Auto Scaling service based on scaling configuration and rules.
- Manually added ECS instances are manually added to a scaling group, not created by the Auto Scaling service.
An ECS instance in a scaling group may be in the following states during its lifecycle:
- Pending: The ECS instance is being added to the scaling group. The instance may be being created, added to the Server Load Balancer instance, or added to the RDS access whitelist.
- In Service: The ECS instance has been added to the scaling group and is providing services.
- Removing: The ECS instance is being removed from the scaling group.
An ECS instance in a scaling group may be in the following health states:
ECS instances are unhealthy when they are not running. Auto Scaling automatically removes unhealthy ECS instances from scaling groups. Auto Scaling stops and releases unhealthy ECS instances that were created automatically. Auto Scaling does not stop and release unhealthy ECS instances that were created manually.
On the Scaling group management page, click Manage next to the scaling group.
Click ECS instance list on the left side.