添加新 Prometheus 抓取目标的教程：Amazon ECS 上的 Memcached

请安装 Amazon ECS CLI（如果尚未安装）。有关更多信息，请参阅安装 Amazon ECS CLI。

设置新的 Amazon ECS 集群名称和区域。例如：

ECS_CLUSTER_NAME=ecs-ec2-memcached-tutorial
AWS_DEFAULT_REGION=ca-central-1

（可选）如果您还没有要在其中安装示例 Memcached 工作负载和 CloudWatch 代理的、带有 EC2 启动类型的 Amazon ECS 集群，您可以通过输入以下命令来创建一个。

ecs-cli up --capability-iam --size 1 \
--instance-type t3.medium \
--cluster $ECS_CLUSTER_NAME \
--region $AWS_REGION

此命令的预期结果如下所示：

WARN[0000] You will not be able to SSH into your EC2 instances without a key pair. 
INFO[0000] Using recommended Amazon Linux 2 AMI with ECS Agent 1.44.4 and Docker version 19.03.6-ce 
INFO[0001] Created cluster                               cluster=ecs-ec2-memcached-tutorial region=ca-central-1
INFO[0002] Waiting for your cluster resources to be created... 
INFO[0002] Cloudformation stack status                   stackStatus=CREATE_IN_PROGRESS
INFO[0063] Cloudformation stack status                   stackStatus=CREATE_IN_PROGRESS
INFO[0124] Cloudformation stack status                   stackStatus=CREATE_IN_PROGRESS
VPC created: vpc-xxxxxxxxxxxxxxxxx
Security Group created: sg-xxxxxxxxxxxxxxxxx
Subnet created: subnet-xxxxxxxxxxxxxxxxx
Subnet created: subnet-xxxxxxxxxxxxxxxxx
Cluster creation succeeded.

通过输入以下命令，下载 Memcached Amazon CloudFormation 模板。

curl -O https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/ecs-task-definition-templates/deployment-mode/replica-service/cwagent-prometheus/sample_traffic/memcached/memcached-traffic-sample.yaml

通过输入以下命令，设置要为 Memcached 创建的 IAM 角色名称。

MEMCACHED_ECS_TASK_ROLE_NAME=memcached-prometheus-demo-ecs-task-role-name
MEMCACHED_ECS_EXECUTION_ROLE_NAME=memcached-prometheus-demo-ecs-execution-role-name

通过输入以下命令，安装示例 Memcached 工作负载。此示例在 host 网络模式下安装工作负载。

MEMCACHED_ECS_NETWORK_MODE=host

aws cloudformation create-stack --stack-name Memcached-Prometheus-Demo-ECS-$ECS_CLUSTER_NAME-EC2-$MEMCACHED_ECS_NETWORK_MODE \
    --template-body file://memcached-traffic-sample.yaml \
    --parameters ParameterKey=ECSClusterName,ParameterValue=$ECS_CLUSTER_NAME \
                 ParameterKey=ECSNetworkMode,ParameterValue=$MEMCACHED_ECS_NETWORK_MODE \
                 ParameterKey=TaskRoleName,ParameterValue=$MEMCACHED_ECS_TASK_ROLE_NAME \
                 ParameterKey=ExecutionRoleName,ParameterValue=$MEMCACHED_ECS_EXECUTION_ROLE_NAME \
    --capabilities CAPABILITY_NAMED_IAM \
    --region $AWS_REGION

通过输入以下命令，下载 cwagent-ecs-prometheus-metric-for-awsvpc.yaml 的最新版本。

curl -O https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/ecs-task-definition-templates/deployment-mode/replica-service/cwagent-prometheus/cloudformation-quickstart/cwagent-ecs-prometheus-metric-for-awsvpc.yaml

使用文本编辑器打开该文件，并在 resource:CWAgentConfigSSMParameter 部分中的 value 密钥后面查找完整的 CloudWatch 代理配置。

然后，在 ecs_service_discovery 部分中，将以下配置添加到 task_definition_list 部分中。

{
    "sd_job_name": "ecs-memcached",
    "sd_metrics_ports": "9150",
    "sd_task_definition_arn_pattern": ".*:task-definition/memcached-prometheus-demo.*:[0-9]+"
},

对于 metric_declaration 部分，默认设置不允许任何 Memcached 指标。添加以下部分以允许 Memcached 指标。请务必遵循现有的缩进模式。

{
  "source_labels": ["container_name"],
  "label_matcher": "memcached-exporter-.*",
  "dimensions": [["ClusterName", "TaskDefinitionFamily"]],
  "metric_selectors": [
    "^memcached_current_(bytes|items|connections)$",
    "^memcached_items_(reclaimed|evicted)_total$",
    "^memcached_(written|read)_bytes_total$",
    "^memcached_limit_bytes$",
    "^memcached_commands_total$"
  ]
},
{
  "source_labels": ["container_name"],
  "label_matcher": "memcached-exporter-.*",
  "dimensions": [["ClusterName", "TaskDefinitionFamily","status","command"], ["ClusterName", "TaskDefinitionFamily","command"]],
  "metric_selectors": [
    "^memcached_commands_total$"
  ]
},

如果 Amazon CloudFormation 已在 Amazon ECS 集群中部署 CloudWatch 代理，您可以通过输入以下命令来创建更改集。

ECS_NETWORK_MODE=bridge
CREATE_IAM_ROLES=True
ECS_TASK_ROLE_NAME=your_selected_ecs_task_role_name
ECS_EXECUTION_ROLE_NAME=your_selected_ecs_execution_role_name

aws cloudformation create-change-set --stack-name CWAgent-Prometheus-ECS-${ECS_CLUSTER_NAME}-EC2-${ECS_NETWORK_MODE} \
    --template-body file://cwagent-ecs-prometheus-metric-for-bridge-host.yaml \
    --parameters ParameterKey=ECSClusterName,ParameterValue=$ECS_CLUSTER_NAME \
                 ParameterKey=CreateIAMRoles,ParameterValue=$CREATE_IAM_ROLES \
                 ParameterKey=ECSNetworkMode,ParameterValue=$ECS_NETWORK_MODE \
                 ParameterKey=TaskRoleName,ParameterValue=$ECS_TASK_ROLE_NAME \
                 ParameterKey=ExecutionRoleName,ParameterValue=$ECS_EXECUTION_ROLE_NAME \
    --capabilities CAPABILITY_NAMED_IAM \
    --region $AWS_REGION \
    --change-set-name memcached-scraping-support

打开 Amazon CloudFormation 控制台，地址：https://console.aws.amazon.com/cloudformation。

查看新创建的变更集 memcached-scraping-support。您会看到一项应用于 CWAgentConfigSSMParameter 资源的更改。通过输入以下命令执行变更集并重新启动 CloudWatch 代理任务。

aws ecs update-service --cluster $ECS_CLUSTER_NAME \
--desired-count 0 \
--service cwagent-prometheus-replica-service-EC2-$ECS_NETWORK_MODE \
--region $AWS_REGION

等待大约 10 秒，然后输入以下命令。

aws ecs update-service --cluster $ECS_CLUSTER_NAME \
--desired-count 1 \
--service cwagent-prometheus-replica-service-EC2-$ECS_NETWORK_MODE \
--region $AWS_REGION

如果您是首次为集群安装带有 Prometheus 指标收集功能的 CloudWatch 代理，请输入以下命令：

ECS_NETWORK_MODEE=bridge
CREATE_IAM_ROLES=True
ECS_TASK_ROLE_NAME=your_selected_ecs_task_role_name
ECS_EXECUTION_ROLE_NAME=your_selected_ecs_execution_role_name

aws cloudformation create-stack --stack-name CWAgent-Prometheus-ECS-${ECS_CLUSTER_NAME}-EC2-${ECS_NETWORK_MODE} \
    --template-body file://cwagent-ecs-prometheus-metric-for-bridge-host.yaml \
    --parameters ParameterKey=ECSClusterName,ParameterValue=$ECS_CLUSTER_NAME \
                 ParameterKey=CreateIAMRoles,ParameterValue=$CREATE_IAM_ROLES \
                 ParameterKey=ECSNetworkMode,ParameterValue=$ECS_NETWORK_MODE \
                 ParameterKey=TaskRoleName,ParameterValue=$ECS_TASK_ROLE_NAME \
                 ParameterKey=ExecutionRoleName,ParameterValue=$ECS_EXECUTION_ROLE_NAME \
    --capabilities CAPABILITY_NAMED_IAM \
    --region $AWS_REGION 

创建环境变量，替换以下值以匹配部署。

DASHBOARD_NAME=your_memcached_cw_dashboard_name
ECS_TASK_DEF_FAMILY=memcached-prometheus-demo-$ECS_CLUSTER_NAME-EC2-$MEMCACHED_ECS_NETWORK_MOD

输入以下命令以创建控制面板。

curl https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/ecs-task-definition-templates/deployment-mode/replica-service/cwagent-prometheus/sample_cloudwatch_dashboards/memcached/cw_dashboard_memcached.json \
| sed "s/{{YOUR_AWS_REGION}}/$AWS_REGION/g" \
| sed "s/{{YOUR_CLUSTER_NAME}}/$ECS_CLUSTER_NAME/g" \
| sed "s/{{YOUR_TASK_DEF_FAMILY}}/$ECS_TASK_DEF_FAMILY/g" \
| xargs -0 aws cloudwatch put-dashboard --dashboard-name ${DASHBOARD_NAME} --region $AWS_REGION --dashboard-body