使用kind快速部署多节点k8s

 2025/02/06 

kind可以用以部署多个集群，适用于本地多集群测试与CI/CD测试
支持多集群共享镜像缓存
缺点：只适用于内核版本比较高的系统，像是almalinux等
像是centos7.9就会因为内核版本落后，无法使用cgroup进行容器的资源隔离，启动时会报错

初始化内容（略过）

包括安装docker，kubectl等

安装kind

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curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.22.0/kind-linux-amd64
chmod +x ./kind
sudo mv ./kind /usr/local/bin/kind

创建单节点集群

kind create cluster --name my-cluster
kind create cluster --name my-cluster-2

Creating cluster "my-cluster-2" ...
 ✓ Ensuring node image (kindest/node:v1.29.2) 🖼
 ✓ Preparing nodes 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
Set kubectl context to "kind-my-cluster-2"
You can now use your cluster with:

kubectl cluster-info --context kind-my-cluster-2

Thanks for using kind! 😊

此时就已经创建了两个集群了，通过查看上下文可以
kubectl config get-contexts
CURRENT   NAME                CLUSTER             AUTHINFO            NAMESPACE
          kind-my-cluster     kind-my-cluster     kind-my-cluster
*         kind-my-cluster-2   kind-my-cluster-2   kind-my-cluster-2

测试进行镜像拉取，能不能跑业务
cat >k8s-test.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:alpine
        ports:
        - containerPort: 80
EOF

kubectl apply -f k8s-test.yaml

删除这两个集群
kind delete cluster --name my-cluster
kind delete cluster --name my-cluster-2

创建多节点k8s集群

利用yaml配置文件来创建集群，可以指定k8s的镜像版本

cat >kind-config.yaml<<EOF
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  image: kindest/node:v1.23.0
  extraMounts:
    - hostPath: /var/run/docker.sock
      containerPath: /var/run/docker.sock
- role: worker
  image: kindest/node:v1.23.0
  extraMounts:
    - hostPath: /var/run/docker.sock
      containerPath: /var/run/docker.sock
- role: worker
  image: kindest/node:v1.23.0
  extraMounts:
    - hostPath: /var/run/docker.sock
      containerPath: /var/run/docker.sock
EOF

kind create cluster --config kind-config.yaml --name ws-cluster

kubectl get nodes
NAME                       STATUS   ROLES                  AGE   VERSION
ws-cluster-control-plane   Ready    control-plane,master   11m   v1.23.0
ws-cluster-worker          Ready    <none>                 11m   v1.23.0
ws-cluster-worker2         Ready    <none>                 11m   v1.23.0

其他常用命令

创建单节点集群
kind create cluster --name <cluster-name>

使用配置文件创建集群
kind create cluster --config <config-name> --name <cluster-name>

删除集群
kind delete cluster --name <cluster-name>

列出集群
kind get clusters

导出集群配置到一个新的kubeconfig中
kind export kubeconfig --name <cluster-name> --kubeconfig <kubeconfig-name>
如
kind export kubeconfig --name ws-cluster --kubeconfig config_ws
#Set kubectl context to "kind-ws-cluster"
当前目录下生成了一个config_ws

加载镜像到集群内
kind load docker-image <image-name> --name <cluster-name>

停止与启动集群
docker stop $(docker ps -q -f "label=io.x-k8s.kind.cluster=<cluster-name>")
docker start $(docker ps -aq -f "label=io.x-k8s.kind.cluster=<cluster-name>")