Show host a task is running on in emp ps

[ejholmes]

This would be really easy to do, and would be helpful for debugging.

[Nosajool]

Unfortunately, the host isn't a field on the Task so it seems like we'd have to make another request. One way to do this is to feed the task's ContainerInstanceArns to func (*ECS) DescribeContainerInstances Then we'd have access to the container's Ec2InstanceId.

http://docs.aws.amazon.com/sdk-for-go/api/service/ecs/#Task

type Task struct {
    // The Amazon Resource Name (ARN) of the cluster that hosts the task.
    ClusterArn *string `locationName:"clusterArn" type:"string"`
    // The Amazon Resource Name (ARN) of the container instances that host the task.
    ContainerInstanceArn *string `locationName:"containerInstanceArn" type:"string"`
    // The containers associated with the task.
    Containers []*Container `locationName:"containers" type:"list"`
    // The Unix timestamp for when the task was created (the task entered the PENDING
    // state).
    CreatedAt *time.Time `locationName:"createdAt" type:"timestamp" timestampFormat:"unix"`
    // The desired status of the task.
    DesiredStatus *string `locationName:"desiredStatus" type:"string"`
    // The last known status of the task.
    LastStatus *string `locationName:"lastStatus" type:"string"`
    // One or more container overrides.
    Overrides *TaskOverride `locationName:"overrides" type:"structure"`
    // The Unix timestamp for when the task was started (the task transitioned from
    // the PENDING state to the RUNNING state).
    StartedAt *time.Time `locationName:"startedAt" type:"timestamp" timestampFormat:"unix"`
    // The tag specified when a task is started. If the task is started by an Amazon
    // ECS service, then the startedBy parameter contains the deployment ID of the
    // service that starts it.
    StartedBy *string `locationName:"startedBy" type:"string"`
    // The Unix timestamp for when the task was stopped (the task transitioned from
    // the RUNNING state to the STOPPED state).
    StoppedAt *time.Time `locationName:"stoppedAt" type:"timestamp" timestampFormat:"unix"`
    // The reason the task was stopped.
    StoppedReason *string `locationName:"stoppedReason" type:"string"`
    // The Amazon Resource Name (ARN) of the task.
    TaskArn *string `locationName:"taskArn" type:"string"`
    // The Amazon Resource Name (ARN) of the task definition that creates the task.
    TaskDefinitionArn *string `locationName:"taskDefinitionArn" type:"string"`
    // contains filtered or unexported fields
}

func (c *ECS) DescribeContainerInstances(input *DescribeContainerInstancesInput) (*DescribeContainerInstancesOutput, error)

type DescribeContainerInstancesInput struct {
    // The short name or full Amazon Resource Name (ARN) of the cluster that hosts
    // the container instances to describe. If you do not specify a cluster, the
    // default cluster is assumed.
    Cluster *string `locationName:"cluster" type:"string"`
    // A space-separated list of container instance IDs or full Amazon Resource
    // Name (ARN) entries.
    ContainerInstances []*string `locationName:"containerInstances" type:"list" required:"true"`
    // contains filtered or unexported fields
}


type DescribeContainerInstancesOutput struct {
    // The list of container instances.
    ContainerInstances []*ContainerInstance `locationName:"containerInstances" type:"list"`
    // Any failures associated with the call.
    Failures []*Failure `locationName:"failures" type:"list"`
    // contains filtered or unexported fields
}

type ContainerInstance struct {
    // This parameter returns true if the agent is actually connected to Amazon
    // ECS. Registered instances with an agent that may be unhealthy or stopped
    // return false, and instances without a connected agent cannot accept placement
    // requests.
    AgentConnected *bool `locationName:"agentConnected" type:"boolean"`
    // The status of the most recent agent update. If an update has never been requested,
    // this value is NULL.
    AgentUpdateStatus *string `locationName:"agentUpdateStatus" type:"string" enum:"AgentUpdateStatus"`
    // The attributes set for the container instance by the Amazon ECS container
    // agent at instance registration.
    Attributes []*Attribute `locationName:"attributes" type:"list"`
    // The Amazon Resource Name (ARN) of the container instance. The ARN contains
    // the arn:aws:ecs namespace, followed by the region of the container instance,
    // the AWS account ID of the container instance owner, the container-instance
    // namespace, and then the container instance ID. For example, arn:aws:ecs:region:aws_account_id:container-instance/container_instance_ID
    // .
    ContainerInstanceArn *string `locationName:"containerInstanceArn" type:"string"`
    // The EC2 instance ID of the container instance.
    Ec2InstanceId *string `locationName:"ec2InstanceId" type:"string"`
    // The number of tasks on the container instance that are in the PENDING status.
    PendingTasksCount *int64 `locationName:"pendingTasksCount" type:"integer"`
    // The registered resources on the container instance that are in use by current
    // tasks.
    RegisteredResources []*Resource `locationName:"registeredResources" type:"list"`
    // The remaining resources of the container instance that are available for
    // new tasks.
    RemainingResources []*Resource `locationName:"remainingResources" type:"list"`
    // The number of tasks on the container instance that are in the RUNNING status.
    RunningTasksCount *int64 `locationName:"runningTasksCount" type:"integer"`
    // The status of the container instance. The valid values are ACTIVE or INACTIVE.
    // ACTIVE indicates that the container instance can accept tasks.
    Status *string `locationName:"status" type:"string"`
    // The version information for the Amazon ECS container agent and Docker daemon
    // running on the container instance.
    VersionInfo *VersionInfo `locationName:"versionInfo" type:"structure"`
    // contains filtered or unexported fields
}

cc @phobologic, this is what I was talking about in standup