【k8s集群】搭建步骤

由于k8s计划在v1.20后弃用docker(指容器运行时,而非docker容器),故计划采用containerd作为容器运行时。

一、安装containerd和crictl

1.1 名词解释
runc:根据OCI规范来生成和运行容器的命令行工具。
containerd:容器运行时
crictl:k8s的命令行工具

1.2 安装步骤

# 1.  安装 runc
curl -OL https://github.com/opencontainers/runc/releases/download/v1.0.0-rc92/runc.amd64
mv runc.amd64 /usr/local/bin/runc && chmod +x /usr/local/bin/runc

# 2. 安装 containerd
curl -OL https://github.com/containerd/containerd/releases/download/v1.4.3/containerd-1.4.3-linux-amd64.tar.gz
tar -zxvf containerd-1.4.3-linux-amd64.tar.gz -C /usr/local
curl -o /etc/systemd/system/containerd.service https://raw.githubusercontent.com/containerd/cri/master/contrib/systemd-units/containerd.service

# 3. 配置 containerd
mkdir -p /etc/containerd
cat > /etc/containerd/config.toml << EOF
[plugins]
  [plugins."io.containerd.grpc.v1.cri"]
    sandbox_image = "kubesphere/pause:3.2"
    [plugins."io.containerd.grpc.v1.cri".registry]
      [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
          endpoint = ["https://registry-1.docker.io"]     ## 这里可替换成dockerhub的镜像加速器
EOF
systemctl enable containerd && systemctl restart containerd

# 4. 安装 crictl
VERSION="v1.19.0"
curl -OL https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/crictl-$VERSION-linux-amd64.tar.gz
sudo tar zxvf crictl-$VERSION-linux-amd64.tar.gz -C /usr/local/bin
rm -f crictl-$VERSION-linux-amd64.tar.gz

# 5. 配置crictl
cat > /etc/crictl.yaml << EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 2
debug: false
pull-image-on-create: false
EOF

二、部署k8s和kubesphere

# 1. 下载kubekey
## 这里暂时使用kubekey v1.1.0-alpha.1部署kubernetes集群,该版本为预览版,支持多container-runtime也会包含在后续的正式版本中。
curl -OL https://github.com/kubesphere/kubekey/releases/download/v1.1.0-alpha.1/kubekey-v1.1.0-alpha.1-linux-amd64.tar.gz
tar -zxvf  kubekey-v1.1.0-alpha.1-linux-amd64.tar.gz
# 2. 创建配置文件 
./kk create config     # 默认在同级目录下生成 config-sample.yaml    
# 3. 根据真实环境信息修改配置文件
vi config-sample.yaml  

apiVersion: kubekey.kubesphere.io/v1alpha1
kind: Cluster
metadata:
  name: sample
spec:
  hosts:
  - {name: node1, address: 192.168.6.3, internalAddress: 192.168.6.3, password: xxx}
  - {name: node2, address: 192.168.6.4, internalAddress: 192.168.6.4, password: xxx}
  roleGroups:
    etcd:
    - node1
    master: 
    - node1
    worker:
    - node1
    - node2
  controlPlaneEndpoint:
    domain: lb.kubesphere.local
    address: ""
    port: 6443
  kubernetes:
    version: v1.17.9
    imageRepo: kubesphere
    clusterName: cluster.local
    containerManager: containerd    ## 这里填入之前部署的container-runtime:containerd / crio / isula
  network:
    plugin: calico
    kubePodsCIDR: 10.233.64.0/18
    kubeServiceCIDR: 10.233.0.0/18
  registry:
    registryMirrors: []
    insecureRegistries: []
  addons: []

# 4. 部署集群
./kk create cluster -f config-sample.yaml  --with-kubesphere

# 5. 等待集群部署完成

注:kubesphere默认账号密码是admin/P@88w0rd

参考链接:https://kubesphere.com.cn/for...

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