2017-08-21 17:44:43 +08:00
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<title>2.2.17 Label · Kubernetes Handbook</title>
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<meta name="author" content="Jimmy Song">
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</head>
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<body>
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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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1. 前言
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</a>
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</li>
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<li class="chapter " data-level="1.2" data-path="./">
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<a href="./">
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2. 概念原理
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.2.1" data-path="concepts.html">
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<a href="concepts.html">
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2.1 设计理念
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</a>
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</li>
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<li class="chapter " data-level="1.2.2" data-path="objects.html">
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<a href="objects.html">
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2.2 主要概念
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.2.2.1" data-path="pod-overview.html">
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<a href="pod-overview.html">
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2.2.1 Pod
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.2.2.1.1" data-path="pod.html">
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<a href="pod.html">
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2.2.1.1 Pod解析
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.2.2.2" data-path="node.html">
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<a href="node.html">
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2.2.2 Node
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.3" data-path="namespace.html">
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<a href="namespace.html">
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2.2.3 Namespace
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.4" data-path="service.html">
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<a href="service.html">
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2.2.4 Service
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.5" data-path="volume.html">
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<a href="volume.html">
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2.2.5 Volume和Persistent Volume
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.6" data-path="deployment.html">
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<a href="deployment.html">
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2.2.6 Deployment
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.7" data-path="secret.html">
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<a href="secret.html">
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2.2.7 Secret
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.8" data-path="statefulset.html">
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<a href="statefulset.html">
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2.2.8 StatefulSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.9" data-path="daemonset.html">
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<a href="daemonset.html">
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2.2.9 DaemonSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.10" data-path="serviceaccount.html">
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<a href="serviceaccount.html">
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2.2.10 ServiceAccount
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.11" data-path="replicaset.html">
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<a href="replicaset.html">
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2.2.11 ReplicationController和ReplicaSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.12" data-path="job.html">
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<a href="job.html">
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2.2.12 Job
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.13" data-path="cronjob.html">
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<a href="cronjob.html">
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2.2.13 CronJob
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.14" data-path="ingress.html">
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<a href="ingress.html">
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2.2.14 Ingress
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.15" data-path="configmap.html">
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<a href="configmap.html">
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2.2.15 ConfigMap
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.16" data-path="horizontal-pod-autoscaling.html">
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<a href="horizontal-pod-autoscaling.html">
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2.2.16 Horizontal Pod Autoscaling
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</a>
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</li>
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<li class="chapter active" data-level="1.2.2.17" data-path="label.html">
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<a href="label.html">
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2.2.17 Label
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3" data-path="../guide/">
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<a href="../guide/">
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3. 用户指南
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.1" data-path="../guide/resource-configuration.html">
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<a href="../guide/resource-configuration.html">
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3.1 资源配置
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.1.1" data-path="../guide/configure-liveness-readiness-probes.html">
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<a href="../guide/configure-liveness-readiness-probes.html">
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3.1.1 配置Pod的liveness和readiness探针
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</a>
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</li>
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<li class="chapter " data-level="1.3.1.2" data-path="../guide/configure-pod-service-account.html">
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<a href="../guide/configure-pod-service-account.html">
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3.1.2 配置Pod的Service Account
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.2" data-path="../guide/command-usage.html">
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<a href="../guide/command-usage.html">
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3.2 命令使用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.2.1" data-path="../guide/using-kubectl.html">
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<a href="../guide/using-kubectl.html">
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3.2.1 使用kubectl
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.3" data-path="../guide/cluster-management.html">
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<a href="../guide/cluster-management.html">
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3.3 集群管理
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.3.1" data-path="../guide/managing-tls-in-a-cluster.html">
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<a href="../guide/managing-tls-in-a-cluster.html">
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3.3.1 管理集群中的TLS
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</a>
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2017-08-21 18:44:34 +08:00
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</li>
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<li class="chapter " data-level="1.3.3.2" data-path="../guide/kubelet-authentication-authorization.html">
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<a href="../guide/kubelet-authentication-authorization.html">
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3.3.2 kubelet的认证授权
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</a>
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</li>
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<li class="chapter " data-level="1.3.3.3" data-path="../guide/tls-bootstrapping.html">
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<a href="../guide/tls-bootstrapping.html">
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3.3.3 TLS bootstrap
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.4" data-path="../guide/access-kubernetes-cluster.html">
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<a href="../guide/access-kubernetes-cluster.html">
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3.4 访问 Kubernetes 集群
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.4.1" data-path="../guide/access-cluster.html">
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<a href="../guide/access-cluster.html">
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3.4.1 访问集群
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.2" data-path="../guide/authenticate-across-clusters-kubeconfig.html">
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<a href="../guide/authenticate-across-clusters-kubeconfig.html">
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3.4.2 使用 kubeconfig 文件配置跨集群认证
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.3" data-path="../guide/connecting-to-applications-port-forward.html">
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<a href="../guide/connecting-to-applications-port-forward.html">
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3.4.3 通过端口转发访问集群中的应用程序
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.4" data-path="../guide/service-access-application-cluster.html">
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<a href="../guide/service-access-application-cluster.html">
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3.4.4 使用 service 访问群集中的应用程序
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.5" data-path="../guide/application-development-deployment-flow.html">
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<a href="../guide/application-development-deployment-flow.html">
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3.5 在kubernetes中开发部署应用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.5.1" data-path="../guide/deploy-applications-in-kubernetes.html">
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<a href="../guide/deploy-applications-in-kubernetes.html">
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3.5.1 适用于kubernetes的应用开发部署流程
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</a>
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|
2017-08-21 18:44:34 +08:00
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</li>
|
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<li class="chapter " data-level="1.3.5.2" data-path="../guide/migrating-hadoop-yarn-to-kubernetes.html">
|
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<a href="../guide/migrating-hadoop-yarn-to-kubernetes.html">
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3.5.2 迁移传统应用到kubernetes中——以Hadoop YARN为例
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</a>
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2017-08-21 17:44:43 +08:00
|
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4" data-path="../practice/">
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<a href="../practice/">
|
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4. 最佳实践
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.1" data-path="../practice/install-kbernetes1.6-on-centos.html">
|
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<a href="../practice/install-kbernetes1.6-on-centos.html">
|
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4.1 在CentOS上部署kubernetes1.6集群
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</a>
|
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<ul class="articles">
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<li class="chapter " data-level="1.4.1.1" data-path="../practice/create-tls-and-secret-key.html">
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<a href="../practice/create-tls-and-secret-key.html">
|
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|
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4.1.1 创建TLS证书和秘钥
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.2" data-path="../practice/create-kubeconfig.html">
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<a href="../practice/create-kubeconfig.html">
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4.1.2 创建kubeconfig文件
|
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.3" data-path="../practice/etcd-cluster-installation.html">
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<a href="../practice/etcd-cluster-installation.html">
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4.1.3 创建高可用etcd集群
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.4" data-path="../practice/kubectl-installation.html">
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<a href="../practice/kubectl-installation.html">
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4.1.4 安装kubectl命令行工具
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.5" data-path="../practice/master-installation.html">
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<a href="../practice/master-installation.html">
|
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4.1.5 部署master节点
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.6" data-path="../practice/node-installation.html">
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<a href="../practice/node-installation.html">
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4.1.6 部署node节点
|
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.7" data-path="../practice/kubedns-addon-installation.html">
|
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<a href="../practice/kubedns-addon-installation.html">
|
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4.1.7 安装kubedns插件
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.8" data-path="../practice/dashboard-addon-installation.html">
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<a href="../practice/dashboard-addon-installation.html">
|
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4.1.8 安装dashboard插件
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.1.9" data-path="../practice/heapster-addon-installation.html">
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<a href="../practice/heapster-addon-installation.html">
|
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4.1.9 安装heapster插件
|
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.10" data-path="../practice/efk-addon-installation.html">
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<a href="../practice/efk-addon-installation.html">
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4.1.10 安装EFK插件
|
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.2" data-path="../practice/service-discovery-and-loadbalancing.html">
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<a href="../practice/service-discovery-and-loadbalancing.html">
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4.2 服务发现与负载均衡
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</a>
|
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<ul class="articles">
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<li class="chapter " data-level="1.4.2.1" data-path="../practice/traefik-ingress-installation.html">
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<a href="../practice/traefik-ingress-installation.html">
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4.2.1 安装Traefik ingress
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.2.2" data-path="../practice/distributed-load-test.html">
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<a href="../practice/distributed-load-test.html">
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4.2.2 分布式负载测试
|
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</a>
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</li>
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<li class="chapter " data-level="1.4.2.3" data-path="../practice/network-and-cluster-perfermance-test.html">
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<a href="../practice/network-and-cluster-perfermance-test.html">
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4.2.3 网络和集群性能测试
|
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</a>
|
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</li>
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<li class="chapter " data-level="1.4.2.4" data-path="../practice/edge-node-configuration.html">
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<a href="../practice/edge-node-configuration.html">
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4.2.4 边缘节点配置
|
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.3" data-path="../practice/operation.html">
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<a href="../practice/operation.html">
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4.3 运维管理
|
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</a>
|
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<ul class="articles">
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<li class="chapter " data-level="1.4.3.1" data-path="../practice/service-rolling-update.html">
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<a href="../practice/service-rolling-update.html">
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4.3.1 服务滚动升级
|
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</a>
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<li class="chapter " data-level="1.4.3.2" data-path="../practice/app-log-collection.html">
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<a href="../practice/app-log-collection.html">
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4.3.2 应用日志收集
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</a>
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<li class="chapter " data-level="1.4.3.3" data-path="../practice/configuration-best-practice.html">
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<a href="../practice/configuration-best-practice.html">
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4.3.3 配置最佳实践
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.4" data-path="../practice/monitor.html">
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<a href="../practice/monitor.html">
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4.3.4 集群及应用监控
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.5" data-path="../practice/jenkins-ci-cd.html">
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<a href="../practice/jenkins-ci-cd.html">
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4.3.5 使用Jenkins进行持续构建与发布
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.6" data-path="../practice/data-persistence-problem.html">
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<a href="../practice/data-persistence-problem.html">
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4.3.6 数据持久化问题
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</a>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.4" data-path="../practice/storage.html">
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<a href="../practice/storage.html">
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4.4 存储管理
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.4.1" data-path="../practice/glusterfs.html">
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<a href="../practice/glusterfs.html">
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4.4.1 GlusterFS
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.4.1.1" data-path="../practice/using-glusterfs-for-persistent-storage.html">
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<a href="../practice/using-glusterfs-for-persistent-storage.html">
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4.4.1.1 使用GlusterFS做持久化存储
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</a>
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</li>
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<li class="chapter " data-level="1.4.4.1.2" data-path="../practice/storage-for-containers-using-glusterfs-with-openshift.html">
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<a href="../practice/storage-for-containers-using-glusterfs-with-openshift.html">
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4.4.1.2 在OpenShift中使用GlusterFS做持久化存储
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</a>
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</ul>
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</ul>
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</li>
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<li class="chapter " data-level="1.5" data-path="../usecases/">
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<a href="../usecases/">
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5. 领域应用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1" data-path="../usecases/microservices.html">
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<a href="../usecases/microservices.html">
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5.1 微服务架构
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.1" data-path="../usecases/istio.html">
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<a href="../usecases/istio.html">
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5.1.1 Istio
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.1.1" data-path="../usecases/istio-installation.html">
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<a href="../usecases/istio-installation.html">
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5.1.1.1 安装istio
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</a>
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</li>
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<li class="chapter " data-level="1.5.1.1.2" data-path="../usecases/configuring-request-routing.html">
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<a href="../usecases/configuring-request-routing.html">
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5.1.1.2 配置请求的路由规则
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</a>
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</ul>
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</li>
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<li class="chapter " data-level="1.5.1.2" data-path="../usecases/linkerd.html">
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<a href="../usecases/linkerd.html">
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5.1.2 Linkerd
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.2.1" data-path="../usecases/linkerd-user-guide.html">
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<a href="../usecases/linkerd-user-guide.html">
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5.1.2.1 Linkerd 使用指南
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</a>
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</ul>
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</li>
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<li class="chapter " data-level="1.5.1.3" data-path="../usecases/service-discovery-in-microservices.html">
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<a href="../usecases/service-discovery-in-microservices.html">
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5.1.3 微服务中的服务发现
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</ul>
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<li class="chapter " data-level="1.5.2" data-path="../usecases/big-data.html">
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<a href="../usecases/big-data.html">
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5.2 大数据
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.2.1" data-path="../usecases/spark-on-kubernetes.html">
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<a href="../usecases/spark-on-kubernetes.html">
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5.2.1 Spark on Kubernetes
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</a>
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<li class="chapter " data-level="1.6" data-path="../develop/">
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<a href="../develop/">
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6. 开发指南
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1" data-path="../develop/developing-environment.html">
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<a href="../develop/developing-environment.html">
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6.1 开发环境搭建
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</a>
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<li class="chapter " data-level="1.6.2" data-path="../develop/testing.html">
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<a href="../develop/testing.html">
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6.2 单元测试和集成测试
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</a>
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<li class="chapter " data-level="1.6.3" data-path="../develop/client-go-sample.html">
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<a href="../develop/client-go-sample.html">
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6.3 client-go示例
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</a>
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<li class="chapter " data-level="1.6.4" data-path="../develop/contribute.html">
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<a href="../develop/contribute.html">
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6.4 社区贡献
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</a>
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</ul>
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</li>
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<li class="chapter " data-level="1.7" data-path="../appendix/">
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<a href="../appendix/">
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7. 附录
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.7.1" data-path="../appendix/docker-best-practice.html">
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<a href="../appendix/docker-best-practice.html">
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7.1 Docker最佳实践
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</a>
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<li class="chapter " data-level="1.7.2" data-path="../appendix/issues.html">
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<a href="../appendix/issues.html">
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7.2 问题记录
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</a>
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<li class="chapter " data-level="1.7.3" data-path="../appendix/tricks.html">
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<a href="../appendix/tricks.html">
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7.3 使用技巧
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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本書使用 GitBook 釋出
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</a>
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</li>
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</ul>
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</div>
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<div class="book-body">
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >2.2.17 Label</a>
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</h1>
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</div>
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<h1 id="label">Label</h1>
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<p>Label是附着到object上(例如Pod)的键值对。可以在创建object的时候指定,也可以在object创建后随时指定。Labels的值对系统本身并没有什么含义,只是对用户才有意义。</p>
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<pre><code class="lang-json"><span class="hljs-string">"labels"</span>: {
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<span class="hljs-string">"key1"</span> : <span class="hljs-string">"value1"</span>,
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<span class="hljs-string">"key2"</span> : <span class="hljs-string">"value2"</span>
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}
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</code></pre>
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<p>Kubernetes最终将对labels最终索引和反向索引用来优化查询和watch,在UI和命令行中会对它们排序。不要在label中使用大型、非标识的结构化数据,记录这样的数据应该用annotation。</p>
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<h2 id="动机">动机</h2>
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<p>Label能够将组织架构映射到系统架构上(就像是康威定律),这样能够更便于微服务的管理,你可以给object打s上如下类型的label:</p>
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<ul>
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<li><code>"release" : "stable"</code>, <code>"release" : "canary"</code></li>
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<li><code>"environment" : "dev"</code>, <code>"environment" : "qa"</code>, <code>"environment" : "production"</code></li>
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<li><code>"tier" : "frontend"</code>, <code>"tier" : "backend"</code>, <code>"tier" : "cache"</code></li>
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<li><code>"partition" : "customerA"</code>, <code>"partition" : "customerB"</code></li>
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<li><code>"track" : "daily"</code>, <code>"track" : "weekly"</code></li>
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<li><code>"team" : "teamA"</code>,<code>"team:" : "teamB"</code></li>
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</ul>
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<h2 id="语法和字符集">语法和字符集</h2>
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<p>Label key的组成:</p>
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<ul>
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<li>不得超过63个字符</li>
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<li>可以使用前缀,使用/分隔,前缀必须是DNS子域,不得超过253个字符,系统中的自动化组件创建的label必须指定前缀,<code>kubernetes.io/</code>由kubernetes保留</li>
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<li>起始必须是字母(大小写都可以)或数字,中间可以有连字符、下划线和点</li>
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</ul>
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<p>Label value的组成:</p>
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<ul>
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<li>不得超过63个字符</li>
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<li>起始必须是字母(大小写都可以)或数字,中间可以有连字符、下划线和点</li>
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</ul>
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<h2 id="label-selector">Label selector</h2>
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<p>Label不是唯一的,很多object可能有相同的label。</p>
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<p>通过label selector,客户端/用户可以指定一个object集合,通过label selector对object的集合进行操作。</p>
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|
<p>Label selector有两种类型:</p>
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<ul>
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|
<li><em>equality-based</em> :可以使用<code>=</code>、<code>==</code>、<code>!=</code>操作符,可以使用逗号分隔多个表达式</li>
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|
<li><em>set-based</em> :可以使用<code>in</code>、<code>notin</code>、<code>!</code>操作符,另外还可以没有操作符,直接写出某个label的key,表示过滤有某个key的object而不管该key的value是何值,<code>!</code>表示没有该label的object</li>
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</ul>
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<h2 id="示例">示例</h2>
|
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|
<pre><code class="lang-bash">$ kubectl get pods <span class="hljs-_">-l</span> environment=production,tier=frontend
|
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|
|
$ kubectl get pods <span class="hljs-_">-l</span> <span class="hljs-string">'environment in (production),tier in (frontend)'</span>
|
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|
|
$ kubectl get pods <span class="hljs-_">-l</span> <span class="hljs-string">'environment in (production, qa)'</span>
|
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|
|
$ kubectl get pods <span class="hljs-_">-l</span> <span class="hljs-string">'environment,environment notin (frontend)'</span>
|
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</code></pre>
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|
<h2 id="在api-object中设置label-selector">在API object中设置label selector</h2>
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<p>在<code>service</code>、<code>replicationcontroller</code>等object中有对pod的label selector,使用方法只能使用等于操作,例如:</p>
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<pre><code class="lang-yaml"><span class="hljs-attr">selector:</span>
|
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|
|
<span class="hljs-attr"> component:</span> redis
|
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|
</code></pre>
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|
<p>在<code>Job</code>、<code>Deployment</code>、<code>ReplicaSet</code>和<code>DaemonSet</code>这些object中,支持<em>set-based</em>的过滤,例如:</p>
|
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<pre><code class="lang-Yaml"><span class="hljs-attr">selector:</span>
|
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|
<span class="hljs-attr"> matchLabels:</span>
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|
<span class="hljs-attr"> component:</span> redis
|
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<span class="hljs-attr"> matchExpressions:</span>
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|
<span class="hljs-bullet"> -</span> {key: tier, operator: In, values: [cache]}
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|
<span class="hljs-bullet"> -</span> {key: environment, operator: NotIn, values: [dev]}
|
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</code></pre>
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|
<p>如Service通过label selector将同一类型的pod作为一个服务expose出来。</p>
|
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|
<figure id="fig1.2.2.17.1"><img src="../images/labels.png" alt="label示意图"><figcaption>Figure: label示意图</figcaption></figure>
|
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<p>另外在node affinity和pod affinity中的label selector的语法又有些许不同,示例如下:</p>
|
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|
|
<pre><code class="lang-Yaml"><span class="hljs-attr"> affinity:</span>
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<span class="hljs-attr"> nodeAffinity:</span>
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<span class="hljs-attr"> requiredDuringSchedulingIgnoredDuringExecution:</span>
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<span class="hljs-attr"> nodeSelectorTerms:</span>
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<span class="hljs-attr"> - matchExpressions:</span>
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|
<span class="hljs-attr"> - key:</span> kubernetes.io/e2e-az-name
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<span class="hljs-attr"> operator:</span> In
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<span class="hljs-attr"> values:</span>
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<span class="hljs-bullet"> -</span> e2e-az1
|
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<span class="hljs-bullet"> -</span> e2e-az2
|
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<span class="hljs-attr"> preferredDuringSchedulingIgnoredDuringExecution:</span>
|
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|
|
<span class="hljs-attr"> - weight:</span> <span class="hljs-number">1</span>
|
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|
|
<span class="hljs-attr"> preference:</span>
|
|
|
|
<span class="hljs-attr"> matchExpressions:</span>
|
|
|
|
<span class="hljs-attr"> - key:</span> another-node-label-key
|
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|
<span class="hljs-attr"> operator:</span> In
|
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|
<span class="hljs-attr"> values:</span>
|
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|
|
<span class="hljs-bullet"> -</span> another-node-label-value
|
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|
|
</code></pre>
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|
|
<p>详见<a href="https://github.com/kubernetes/kubernetes.github.io/tree/master/docs/user-guide/node-selection" target="_blank">node selection</a>。 </p>
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