启动 Kubernetes Worker 节点

启动 Kubernetes Worker 节点

在本次实验中,你将会新建并启动三个Kubernetes work 节点。

以下组件将会被安装到各个节点: runc, container networking plugins, cri-containerd, kubelet, and kube-proxy

事前準备

这次的指令必须在每个 worker 节点上使用: worker-0, worker-1, and worker-2。使用 gcloud 的指令登入每个 worker 节点。

例如:

gcloud compute ssh worker-0

建立 Kubernetes Worker 节点

安装 OS 的相关套件:

sudo apt-get -y install socat

socat 执行档可支援 kubectl port-forward 指令

下载并安装 worker 执行档

wget -q --show-progress --https-only --timestamping \
  https://github.com/containernetworking/plugins/releases/download/v0.6.0/cni-plugins-amd64-v0.6.0.tgz \
  https://github.com/kubernetes-incubator/cri-containerd/releases/download/v1.0.0-alpha.0/cri-containerd-1.0.0-alpha.0.tar.gz \
  https://storage.googleapis.com/kubernetes-release/release/v1.8.0/bin/linux/amd64/kubectl \
  https://storage.googleapis.com/kubernetes-release/release/v1.8.0/bin/linux/amd64/kube-proxy \
  https://storage.googleapis.com/kubernetes-release/release/v1.8.0/bin/linux/amd64/kubelet

建立安装目录:

sudo mkdir -p \
  /etc/cni/net.d \
  /opt/cni/bin \
  /var/lib/kubelet \
  /var/lib/kube-proxy \
  /var/lib/kubernetes \
  /var/run/kubernetes

安装 worker 执行档:

sudo tar -xvf cni-plugins-amd64-v0.6.0.tgz -C /opt/cni/bin/

sudo tar -xvf cri-containerd-1.0.0-alpha.0.tar.gz -C /

chmod +x kubectl kube-proxy kubelet

sudo mv kubectl kube-proxy kubelet /usr/local/bin/

设定 CNI 网路

取得目前Pod CDIR 范围给当前的计算节点:

POD_CIDR=$(curl -s -H "Metadata-Flavor: Google" \
  http://metadata.google.internal/computeMetadata/v1/instance/attributes/pod-cidr)

建立 bridge network 设定档:

cat > 10-bridge.conf <<EOF
{
    "cniVersion": "0.3.1",
    "name": "bridge",
    "type": "bridge",
    "bridge": "cnio0",
    "isGateway": true,
    "ipMasq": true,
    "ipam": {
        "type": "host-local",
        "ranges": [
          [{"subnet": "${POD_CIDR}"}]
        ],
        "routes": [{"dst": "0.0.0.0/0"}]
    }
}
EOF

建立 loopback network 设定档:

cat > 99-loopback.conf <<EOF
{
    "cniVersion": "0.3.1",
    "type": "loopback"
}
EOF

移动网路相关部份的设定挡到CNI的设定资料夹目录下:

sudo mv 10-bridge.conf 99-loopback.conf /etc/cni/net.d/

设定 Kubelet

sudo mv ${HOSTNAME}-key.pem ${HOSTNAME}.pem /var/lib/kubelet/

sudo mv ${HOSTNAME}.kubeconfig /var/lib/kubelet/kubeconfig

sudo mv ca.pem /var/lib/kubernetes/

建立 kubelet.service systemd unit file:

cat > kubelet.service <<EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=cri-containerd.service
Requires=cri-containerd.service

[Service]
ExecStart=/usr/local/bin/kubelet \\
  --allow-privileged=true \\
  --anonymous-auth=false \\
  --authorization-mode=Webhook \\
  --client-ca-file=/var/lib/kubernetes/ca.pem \\
  --cluster-dns=10.32.0.10 \\
  --cluster-domain=cluster.local \\
  --container-runtime=remote \\
  --container-runtime-endpoint=unix:///var/run/cri-containerd.sock \\
  --image-pull-progress-deadline=2m \\
  --kubeconfig=/var/lib/kubelet/kubeconfig \\
  --network-plugin=cni \\
  --pod-cidr=${POD_CIDR} \\
  --register-node=true \\
  --require-kubeconfig \\
  --runtime-request-timeout=15m \\
  --tls-cert-file=/var/lib/kubelet/${HOSTNAME}.pem \\
  --tls-private-key-file=/var/lib/kubelet/${HOSTNAME}-key.pem \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

设定 Kube-Proxy

sudo mv kube-proxy.kubeconfig /var/lib/kube-proxy/kubeconfig

建立 kube-proxy.service systemd unit file:

cat > kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-proxy \\
  --cluster-cidr=10.200.0.0/16 \\
  --kubeconfig=/var/lib/kube-proxy/kubeconfig \\
  --proxy-mode=iptables \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

启动 worker 服务

sudo mv kubelet.service kube-proxy.service /etc/systemd/system/

sudo systemctl daemon-reload

sudo systemctl enable containerd cri-containerd kubelet kube-proxy

sudo systemctl start containerd cri-containerd kubelet kube-proxy

记得上述的指令都要执行每个 worker 节点上: worker-0, worker-1, 和 worker-2

验证

登入其中一个控制节点:

gcloud compute ssh controller-0

列出目前以注册的Kubernetes 节点:

kubectl get nodes

输出为

NAME       STATUS    ROLES     AGE       VERSION
worker-0   Ready     <none>    1m        v1.8.0
worker-1   Ready     <none>    1m        v1.8.0
worker-2   Ready     <none>    1m        v1.8.0

Next: 配置 Kubectl

启动 Kubernetes Node 节点