AnolisOS7.9(CentOS7)部署K8s(1.22.9)集群

一. 安装K8s集群

1. 准备工作，2台服务器

① 192.168.5.140 - 做为master节点
　　# 在该节点运行命令设置主机名：
　　hostnamectl set-hostname master
② 192.168.5.141 - 做为node1节点，在该节点运行命令设置主机名：
　　# 在该节点运行命令设置主机名：
　  hostnamectl set-hostname node1

# 所有节点配置hosts
cat >>/etc/hosts <<EOF
192.168.5.140 master
192.168.5.141 node1
EOF

# 所有节点关闭 SELinux
# 临时关闭
setenforce 0
# 永久关闭
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux

# 所有节点关闭 swap分区
# 临时关闭
swapoff -a
# 永久关闭
sed -ri 's/.*swap.*/#&/' /etc/fstab

# 所有节点关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

# 所有节点时间同步
# 安装 ntp
yum install -y ntp
# 同步时间
ntpdate ntp.aliyun.com
# 查看时间
date
# 设置每小时的第一分钟执行一次同步
vi /etc/crontab
# 新增
1 * * * * root /usr/sbin/ntpdate ntp1.aliyun.com && /sbin/hwclock -w

2. 所有节点安装软件源

# 添加k8s安装源
cat <<EOF > kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

# 
mv kubernetes.repo /etc/yum.repos.d/

# 添加 Docker 安装源
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# 查看k8s可用版本
yum list kubelet --showduplicates | sort -r

# 查看docker可用版本
yum list docker-ce --showduplicates | sort -r

3. 所有节点安装k8s、docker

# 这里指定k8s版本为1.22.9，docker版本为20.10.9
yum install -y kubelet-1.22.9 kubectl-1.22.9 kubeadm-1.22.9 docker-ce-20.10.9 docker-ce-cli-20.10.9

4. 所有节点启动 kubelet、docker，并设置开机启动

systemctl enable kubelet
systemctl start kubelet

systemctl enable docker
systemctl start docker

5. 所有节点修改docker配置

# kubernetes 官方推荐 docker 等使用 systemd 作为 cgroupdriver，否则 kubelet 启动不了
cat <<EOF > daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": ["https://ud6340vz.mirror.aliyuncs.com"]
}
EOF

# 
mv daemon.json /etc/docker/

# 重启
systemctl daemon-reload
systemctl restart docker

6. master节点kubeadm初始化

kubeadm init \
--kubernetes-version=1.22.9 \
--apiserver-advertise-address=192.168.5.140 \
--image-repository=registry.aliyuncs.com/google_containers \
--pod-network-cidr=10.244.0.0/16

# 如果init失败，使用下面命令重置后再init
kubeadm reset

# 解释
# 指定K8s的版本，刚才安装的
--kubernetes-version=1.22.9 \
# 指定API Server组件的地址
--apiserver-advertise-address=192.168.5.140 \
# 指定阿里的镜像仓库地址，因为管理节点和工作节点的部分组件是封装到kubeadm工具中的，等会启动的时候，它默认会从国外的源下载镜像，所以这里为了加快速度指定为国内源
--image-repository registry.aliyuncs.com/google_containers \
# pod网段，可以选择一个本机网络和service-cidr都没有用到的私网地址段
--pod-network-cidr=10.244.0.0/16

7. 看到下面的内容说明master节点初始化完成

　　如果关闭了窗口，可以通过下面的命令查看

kubeadm token create --print-join-command

8. 复制授权文件，以便 kubectl 可以有权限访问集群

# 如果其他节点或本地需要访问集群，需要从主节点复制这个文件过去其他节点或本地，这样其他节点或本地执行kubectl命令了
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=/etc/kubernetes/admin.conf

9. 将子节点加入集群

# 将上面的内容在所有子节点运行
kubeadm join 192.168.5.140:6443 --token 65tl4q.mbzgy903o25b75g1 --discovery-token-ca-cert-hash sha256:fa7875e9420e44f87cbf702c91f54e6fb85bd01fa77288a32fb64f28ac10978f

10. 安装flannel网络插件，使用提供的 kube-flannel.yml文件，在master节点上执行命令

kubectl apply -f kube-flannel.yml

　　kube-flannel.yml内容如下

---
kind: Namespace
apiVersion: v1
metadata:
  name: kube-flannel
  labels:
    pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: flannel
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes/status
  verbs:
  - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "cniVersion": "0.3.1",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      hostNetwork: true
      priorityClassName: system-node-critical
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni-plugin
       #image: flannelcni/flannel-cni-plugin:v1.1.0 for ppc64le and mips64le (dockerhub limitations may apply)
        image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.0
        command:
        - cp
        args:
        - -f
        - /flannel
        - /opt/cni/bin/flannel
        volumeMounts:
        - name: cni-plugin
          mountPath: /opt/cni/bin
      - name: install-cni
       #image: flannelcni/flannel:v0.20.1 for ppc64le and mips64le (dockerhub limitations may apply)
        image: docker.io/rancher/mirrored-flannelcni-flannel:v0.20.1
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
       #image: flannelcni/flannel:v0.20.1 for ppc64le and mips64le (dockerhub limitations may apply)
        image: docker.io/rancher/mirrored-flannelcni-flannel:v0.20.1
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
            add: ["NET_ADMIN", "NET_RAW"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: EVENT_QUEUE_DEPTH
          value: "5000"
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
        - name: xtables-lock
          mountPath: /run/xtables.lock
      volumes:
      - name: run
        hostPath:
          path: /run/flannel
      - name: cni-plugin
        hostPath:
          path: /opt/cni/bin
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg
      - name: xtables-lock
        hostPath:
          path: /run/xtables.lock
          type: FileOrCreate

11. 查看节点状态和pod就绪状态

kubectl get node
kubectl get pods -A
kubectl get pods -n kube-system