EKS - 节点标签

Question

在 EKS 中部署工作节点时，有没有办法添加节点标签。我在工作节点可用的 CF 模板中没有看到选项。

我现在看到的唯一选择是使用 kubectl label 命令添加标签，即 post 集群设置。但是，需要完全自动化，这意味着应用程序会自动部署 post 集群部署和标签有助于实现隔离。

Answer 1

您需要在 user_data 中添加配置并为 kubelet 使用 --node-labels 选项。这是一个示例 user_data，其中包括 node_labels:

NodeLaunchConfig:
Type: AWS::AutoScaling::LaunchConfiguration
Properties:
  AssociatePublicIpAddress: 'true'
  IamInstanceProfile: !Ref NodeInstanceProfile
  ImageId: !Ref NodeImageId
  InstanceType: !Ref NodeInstanceType
  KeyName: !Ref KeyName
  SecurityGroups:
  - !Ref NodeSecurityGroup
  UserData:
    Fn::Base64:
      Fn::Join: [
        "",
        [
          "#!/bin/bash -xe\n",
          "CA_CERTIFICATE_DIRECTORY=/etc/kubernetes/pki", "\n",
          "CA_CERTIFICATE_FILE_PATH=$CA_CERTIFICATE_DIRECTORY/ca.crt", "\n",
          "MODEL_DIRECTORY_PATH=~/.aws/eks", "\n",
          "MODEL_FILE_PATH=$MODEL_DIRECTORY_PATH/eks-2017-11-01.normal.json", "\n",
          "mkdir -p $CA_CERTIFICATE_DIRECTORY", "\n",
          "mkdir -p $MODEL_DIRECTORY_PATH", "\n",
          "curl -o $MODEL_FILE_PATH https://s3-us-west-2.amazonaws.com/amazon-eks/1.10.3/2018-06-05/eks-2017-11-01.normal.json", "\n",
          "aws configure add-model --service-model file://$MODEL_FILE_PATH --service-name eks", "\n",
          "aws eks describe-cluster --region=", { Ref: "AWS::Region" }," --name=", { Ref: ClusterName }," --query 'cluster.{certificateAuthorityData: certificateAuthority.data, endpoint: endpoint}' > /tmp/describe_cluster_result.json", "\n",
          "cat /tmp/describe_cluster_result.json | grep certificateAuthorityData | awk '{print }' | sed 's/[,\"]//g' | base64 -d >  $CA_CERTIFICATE_FILE_PATH", "\n",
          "MASTER_ENDPOINT=$(cat /tmp/describe_cluster_result.json | grep endpoint | awk '{print }' | sed 's/[,\"]//g')", "\n",
          "INTERNAL_IP=$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4)", "\n",
          "sed -i s,MASTER_ENDPOINT,$MASTER_ENDPOINT,g /var/lib/kubelet/kubeconfig", "\n",
          "sed -i s,CLUSTER_NAME,", { Ref: ClusterName }, ",g /var/lib/kubelet/kubeconfig", "\n",
          "sed -i s,REGION,", { Ref: "AWS::Region" }, ",g /etc/systemd/system/kubelet.service", "\n",
          "sed -i s,MAX_PODS,", { "Fn::FindInMap": [ MaxPodsPerNode, { Ref: NodeInstanceType }, MaxPods ] }, ",g /etc/systemd/system/kubelet.service", "\n",
          "sed -i s,MASTER_ENDPOINT,$MASTER_ENDPOINT,g /etc/systemd/system/kubelet.service", "\n",
          "sed -i s,INTERNAL_IP,$INTERNAL_IP,g /etc/systemd/system/kubelet.service", "\n",
          "DNS_CLUSTER_IP=10.100.0.10", "\n",
          "if [[ $INTERNAL_IP == 10.* ]] ; then DNS_CLUSTER_IP=172.20.0.10; fi", "\n",
          "sed -i s,DNS_CLUSTER_IP,$DNS_CLUSTER_IP,g  /etc/systemd/system/kubelet.service", "\n",
          "sed -i s,CERTIFICATE_AUTHORITY_FILE,$CA_CERTIFICATE_FILE_PATH,g /var/lib/kubelet/kubeconfig" , "\n",
          "sed -i s,CLIENT_CA_FILE,$CA_CERTIFICATE_FILE_PATH,g  /etc/systemd/system/kubelet.service" , "\n"
          "sed -i s,INTERNAL_IP/a,--node-labels tier=development,g  /etc/systemd/system/kubelet.service" , "\n"
          "systemctl daemon-reload", "\n",
          "systemctl restart kubelet", "\n",
          "/opt/aws/bin/cfn-signal -e $? ",
          "         --stack ", { Ref: "AWS::StackName" },
          "         --resource NodeGroup ",
          "         --region ", { Ref: "AWS::Region" }, "\n"
        ]
      ]

相关行是：

"sed -i s,INTERNAL_IP/a,--node-labels tier=development,g  /etc/systemd/system/kubelet.service" , "\n"

警告：我没有测试过这个，但我做了类似的事情并且工作正常

Answer 2

我已经设法让它与下一个 sed 表达式一起工作：

sed -i '/--node-ip/ a \ \ --node-labels group=node \' /etc/systemd/system/kubelet.service

Answer 3

借助 AWS 提供的新 EKS 优化 AMI(amazon-eks-node-vXX) 和 Cloudformation 模板重构，现在可以添加节点标签，就像向 BootstrapArguments 参数提供参数一样简单[amazon-eks-nodegroup.yaml][1] Cloudfomation 模板。例如 --kubelet-extra-args --node-labels=my-key=my-value。有关详细信息，请查看 AWS 公告：Improvements for Amazon EKS Worker Node Provisioning

Answer 4

如果您使用的是 eksctl，则可以向节点组添加标签：

像这样：

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: dev-cluster
  region: eu-north-1

nodeGroups:
  - name: ng-1-workers
    labels: { role: workers }
    instanceType: m5.xlarge
    desiredCapacity: 10
    privateNetworking: true
  - name: ng-2-builders
    labels: { role: builders }
    instanceType: m5.2xlarge
    desiredCapacity: 2
    privateNetworking: true

有关详细信息，请参阅 https://eksctl.io/usage/managing-nodegroups/

Answer 5

现在使用 EKS 托管节点组，您可以在 CFN 中指定节点标签。

见the docs。

EKS - 节点标签

EKS - Node labels

kubernetes

amazon-eks