[英]Using AWS ECS Placement Constraints with instance tags
Is it possible to constrain the placement of ECS tasks based on instance tags?是否可以根据实例标签来约束ECS任务的放置? I have EC2 instances in the ECS cluster that are tagged, and would like to use this to ensure certain tasks run on those instances?
我在 ECS 集群中有标记的 EC2 实例,想用它来确保某些任务在这些实例上运行? I don't see how it can be done.
我不知道如何做到。
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-constraints.html https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-constraints.html
Here is a snippet of Terraform config to illustrate how to implement this approach这是 Terraform 配置的片段,用于说明如何实现此方法
data aws_ssm_parameter amazonLinux2 {
name = "/aws/service/ecs/optimized-ami/amazon-linux-2/recommended/image_id"
}
resource aws_instance elasticsearchInstance {
ami = data.aws_ssm_parameter.amazonLinux2.value
instance_type = "t2.medium"
availability_zone = data.aws_availability_zones.available.names[0]
subnet_id = aws_subnet.ecsPrivateSubnet.id
associate_public_ip_address = false
iam_instance_profile = aws_iam_instance_profile.ecs_agent.name
user_data = <<EOT
#!/bin/bash
echo 'ECS_CLUSTER=clusterName' >> /etc/ecs/ecs.config
echo 'ECS_INSTANCE_ATTRIBUTES={"type": "elasticsearch"}' >> /etc/ecs/ecs.config
EOT
}
resource "aws_ecs_task_definition" "elasticsearchTask" {
family = "elasticsearch"
network_mode = "awsvpc"
container_definitions = jsonencode([
{
name = "elasticsearch"
image = "docker.elastic.co/elasticsearch/elasticsearch:7.15.2"
cpu = 2048
memory = 3942
essential = true
portMappings = [
{
containerPort = 9200
}
]
}
])
placement_constraints {
type = "memberOf"
expression = "attribute:type == elasticsearch"
}
}
The is not a full configuration, but the core bits are setting the user_data
to add ECS_INSTANCE_ATTRIBUTES
in this case type=elasticsearch
and then adding placement_constraints
to the task definition that forces the task onto the instance.这不是一个完整的配置,但核心位正在设置
user_data
以添加ECS_INSTANCE_ATTRIBUTES
在这种情况下type=elasticsearch
elasticsearch 然后将placement_constraints
添加到任务定义中以将任务强制到实例上。
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