Kubelet 설정

1 개요

Kubelet Configuration

Kubelet 설정

• https://cluster-api.sigs.k8s.io/tasks/bootstrap/kubeadm-bootstrap/kubelet-config

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CAPBK has several ways to configure kubelet. CAPBK는 kubelet을 설정하는 방법은 여러 가지 있습니다.

2 KubeadmConfigSpec.files를 통해 KubeletConfiguration 파일 전달

KubeadmConfigSpec.files를 사용하여 노드에 파일을 넣을 수 있습니다. 이 예제는 KubeadmConfigSpec.files를 통해 KubeletConfiguration 파일을 노드에 넣고, KubeadmConfigSpec.kubeletExtraArgs를 통해 kubelet이 이를 사용하게 만듭니다. Kubelet Configuration (v1beta1) | Kubernetes에서 KubeletConfiguration의 사용가능한 설정을 확인할 수 있습니다.

이 방법은 kubeadm이 생성한 전체 kubelet 설정을 대체하기에는 쉬운 방법이지만, kubelet 설정의 일부만을 대체하기에는 쉽지 않습니다.

2.1 KubeadmControlPlaneTemplate

apiVersion: controlplane.cluster.x-k8s.io/v1beta1
kind: KubeadmControlPlaneTemplate
metadata:
  name: cloudinit-control-plane
  namespace: default
spec:
  template:
    spec:
      kubeadmConfigSpec:
        files:
        # We put a KubeletConfiguration file on nodes via KubeadmConfigSpec.files
        # In this example, we directly put the file content in the KubeadmConfigSpec.files.content field.
        - path: /etc/kubernetes/kubelet/config.yaml
          owner: "root:root"
          permissions: "0644"
          content: |
            apiVersion: kubelet.config.k8s.io/v1beta1
            kind: KubeletConfiguration
            kubeReserved:
              cpu: "1"
              memory: "2Gi"
              ephemeral-storage: "1Gi"
            systemReserved:
              cpu: "500m"
              memory: "1Gi"
              ephemeral-storage: "1Gi"
            evictionHard:
              memory.available: "500Mi"
              nodefs.available: "10%"
            authentication:
              anonymous:
                enabled: false
              webhook:
                cacheTTL: 0s
                enabled: true
              x509:
                clientCAFile: /etc/kubernetes/pki/ca.crt
            authorization:
              mode: Webhook
              webhook:
                cacheAuthorizedTTL: 0s
                cacheUnauthorizedTTL: 0s
            cgroupDriver: systemd
            clusterDNS:
            - 10.128.0.10
            clusterDomain: cluster.local
            containerRuntimeEndpoint: ""
            cpuManagerReconcilePeriod: 0s
            evictionPressureTransitionPeriod: 0s
            fileCheckFrequency: 0s
            healthzBindAddress: 127.0.0.1
            healthzPort: 10248
            httpCheckFrequency: 0s
            imageMinimumGCAge: 0s
            logging:
              flushFrequency: 0
              options:
                json:
                  infoBufferSize: "0"
              verbosity: 0
            memorySwap: {}
            nodeStatusReportFrequency: 0s
            nodeStatusUpdateFrequency: 0s
            rotateCertificates: true
            runtimeRequestTimeout: 0s
            shutdownGracePeriod: 0s
            shutdownGracePeriodCriticalPods: 0s
            staticPodPath: /etc/kubernetes/manifests
            streamingConnectionIdleTimeout: 0s
            syncFrequency: 0s
            volumeStatsAggPeriod: 0s
        initConfiguration:
          nodeRegistration:
            criSocket: unix:///var/run/containerd/containerd.sock
            # Here we configure kubelet to use the KubeletConfiguration file we put on nodes via KubeadmConfigSpec.files
            kubeletExtraArgs:
              config: "/etc/kubernetes/kubelet/config.yaml"
        joinConfiguration:
          nodeRegistration:
            criSocket: unix:///var/run/containerd/containerd.sock
            # Here we configure kubelet to use the KubeletConfiguration file we put on nodes via KubeadmConfigSpec.files
            kubeletExtraArgs:
              config: "/etc/kubernetes/kubelet/config.yaml"

2.2 KubeadmConfigTemplate

apiVersion: bootstrap.cluster.x-k8s.io/v1beta1
kind: KubeadmConfigTemplate
metadata:
  name: cloudinit-default-worker-bootstraptemplate
  namespace: default
spec:
  template:
    spec:
      files:
      # We puts a KubeletConfiguration file on nodes via KubeadmConfigSpec.files
      # In this example, we directly put the file content in the KubeadmConfigSpec.files.content field.
      - path: /etc/kubernetes/kubelet/config.yaml
        owner: "root:root"
        permissions: "0644"
        content: |
          apiVersion: kubelet.config.k8s.io/v1beta1
          kind: KubeletConfiguration
          kubeReserved:
            cpu: "1"
            memory: "2Gi"
            ephemeral-storage: "1Gi"
          systemReserved:
            cpu: "500m"
            memory: "1Gi"
            ephemeral-storage: "1Gi"
          evictionHard:
            memory.available: "500Mi"
            nodefs.available: "10%"
          authentication:
            anonymous:
              enabled: false
            webhook:
              cacheTTL: 0s
              enabled: true
            x509:
              clientCAFile: /etc/kubernetes/pki/ca.crt
          authorization:
            mode: Webhook
            webhook:
              cacheAuthorizedTTL: 0s
              cacheUnauthorizedTTL: 0s
          cgroupDriver: systemd
          clusterDNS:
          - 10.128.0.10
          clusterDomain: cluster.local
          containerRuntimeEndpoint: ""
          cpuManagerReconcilePeriod: 0s
          evictionPressureTransitionPeriod: 0s
          fileCheckFrequency: 0s
          healthzBindAddress: 127.0.0.1
          healthzPort: 10248
          httpCheckFrequency: 0s
          imageMinimumGCAge: 0s
          logging:
            flushFrequency: 0
            options:
              json:
                infoBufferSize: "0"
            verbosity: 0
          memorySwap: {}
          nodeStatusReportFrequency: 0s
          nodeStatusUpdateFrequency: 0s
          rotateCertificates: true
          runtimeRequestTimeout: 0s
          shutdownGracePeriod: 0s
          shutdownGracePeriodCriticalPods: 0s
          staticPodPath: /etc/kubernetes/manifests
          streamingConnectionIdleTimeout: 0s
          syncFrequency: 0s
          volumeStatsAggPeriod: 0s
      joinConfiguration:
        nodeRegistration:
          criSocket: unix:///var/run/containerd/containerd.sock
          # Here we configure kubelet to use the KubeletConfiguration file we put on nodes via KubeadmConfigSpec.files
          kubeletExtraArgs:
            config: "/etc/kubernetes/kubelet/config.yaml"