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bootstrapping kube-scheduler

手順

  1. Dockerfile_kube-scheduler.armhf を作成する

    Dockerfile_kube-scheduler.armhf 
    cat << 'EOF' > Dockerfile_kube-scheduler.armhf
FROM arm64v8/ubuntu:bionic

ARG VERSION="v1.30.1"
ARG ARCH="arm64"

RUN set -ex \
  && apt update \
  && apt install -y wget \
  && apt clean \
  && wget -P /usr/bin/ https://dl.k8s.io/$VERSION/bin/linux/$ARCH/kube-scheduler \
  && chmod +x /usr/bin/kube-scheduler \
  && install -o root -g root -m 755 -d /var/lib/kubernetes \
  && install -o root -g root -m 755 -d /etc/kubernetes/config

COPY kube-scheduler.yaml /etc/kubernetes/config/
COPY kube-scheduler.kubeconfig /var/lib/kubernetes/

ENTRYPOINT ["/usr/bin/kube-scheduler"]
EOF

  2. kube-schedulerのconfig生成

  3. k8s 1.19.0 で KubeSchedulerConfiguration が betaにupdateされています

    • https://qiita.com/everpeace/items/7dbf14773db82e765370
      kube-scheduler.yaml 
      cat << EOF > kube-scheduler.yaml
---
apiVersion: kubescheduler.config.k8s.io/v1
kind: KubeSchedulerConfiguration
clientConnection:
  kubeconfig: "/var/lib/kubernetes/kube-scheduler.kubeconfig"
leaderElection:
  leaderElect: false
EOF

  4. image build 

    sudo nerdctl build --namespace k8s.io -t k8s-kube-scheduler --file=Dockerfile_kube-scheduler.armhf ./

  5. pod manifestsを /etc/kubelet.d へ作成する

    /etc/kubelet.d/kube-scheduler.yaml 
    cat << EOF | sudo tee /etc/kubelet.d/kube-scheduler.yaml
---
apiVersion: v1
kind: Pod
metadata:
  name: kube-scheduler
  namespace: kube-system
  labels:
    tier: control-plane
    component: kube-scheduler

spec:
  # https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/
  priorityClassName: system-node-critical
  hostNetwork: true
  containers:
    - name: kube-scheduler
      image: k8s-kube-scheduler:latest
      imagePullPolicy: IfNotPresent
      resources:
        requests:
          cpu: "256m"
          memory: "128Mi"
        limits:
          cpu: "384m"
          memory: "128Mi"
      command:
        - /usr/bin/kube-scheduler
        - --config=/etc/kubernetes/config/kube-scheduler.yaml
        - --v=2
EOF

  6. crictl でコンテナ起動を確認する 

    $ sudo crictl ps --name kube-scheduler
CONTAINER           IMAGE                                                              CREATED             STATE               NAME                ATTEMPT             POD ID
a19648dec2d54       70e852515b3c74175bb3ad4855287cb81101921b2b1f5a890fa4ebd0eeeee684   15 seconds ago      Running             kube-scheduler      0                   da1d0572bc2b1

参考文献