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Container for the parameters to the UpdateContainerInstancesState operation. Modifies the status of an Amazon ECS container instance.
Once a container instance has reached an ACTIVE
state, you can change the status
of a container instance to DRAINING
to manually remove an instance from a cluster,
for example to perform system updates, update the Docker daemon, or scale down the
cluster size.
A container instance can't be changed to DRAINING
until it has reached an ACTIVE
status. If the instance is in any other status, an error will be received.
When you set a container instance to DRAINING
, Amazon ECS prevents new tasks
from being scheduled for placement on the container instance and replacement service
tasks are started on other container instances in the cluster if the resources are
available. Service tasks on the container instance that are in the PENDING
state are stopped immediately.
Service tasks on the container instance that are in the RUNNING
state are stopped
and replaced according to the service's deployment configuration parameters, minimumHealthyPercent
and maximumPercent
. You can change the deployment configuration of your service
using UpdateService.
If minimumHealthyPercent
is below 100%, the scheduler can ignore desiredCount
temporarily during task replacement. For example, desiredCount
is four tasks,
a minimum of 50% allows the scheduler to stop two existing tasks before starting two
new tasks. If the minimum is 100%, the service scheduler can't remove existing tasks
until the replacement tasks are considered healthy. Tasks for services that do not
use a load balancer are considered healthy if they're in the RUNNING
state.
Tasks for services that use a load balancer are considered healthy if they're in the
RUNNING
state and are reported as healthy by the load balancer.
The maximumPercent
parameter represents an upper limit on the number of running
tasks during task replacement. You can use this to define the replacement batch size.
For example, if desiredCount
is four tasks, a maximum of 200% starts four new
tasks before stopping the four tasks to be drained, provided that the cluster resources
required to do this are available. If the maximum is 100%, then replacement tasks
can't start until the draining tasks have stopped.
Any PENDING
or RUNNING
tasks that do not belong to a service aren't
affected. You must wait for them to finish or stop them manually.
A container instance has completed draining when it has no more RUNNING
tasks.
You can verify this using ListTasks.
When a container instance has been drained, you can set a container instance to ACTIVE
status and once it has reached that status the Amazon ECS scheduler can begin scheduling
tasks on the instance again.
Namespace: Amazon.ECS.Model
Assembly: AWSSDK.ECS.dll
Version: 3.x.y.z
public class UpdateContainerInstancesStateRequest : AmazonECSRequest IAmazonWebServiceRequest
The UpdateContainerInstancesStateRequest type exposes the following members
Name | Description | |
---|---|---|
UpdateContainerInstancesStateRequest() |
Name | Type | Description | |
---|---|---|---|
Cluster | System.String |
Gets and sets the property Cluster. The short name or full Amazon Resource Name (ARN) of the cluster that hosts the container instance to update. If you do not specify a cluster, the default cluster is assumed. |
|
ContainerInstances | System.Collections.Generic.List<System.String> |
Gets and sets the property ContainerInstances. A list of up to 10 container instance IDs or full ARN entries. |
|
Status | Amazon.ECS.ContainerInstanceStatus |
Gets and sets the property Status.
The container instance state to update the container instance with. The only valid
values for this action are |
.NET Core App:
Supported in: 3.1
.NET Standard:
Supported in: 2.0
.NET Framework:
Supported in: 4.5, 4.0, 3.5