3.8. K8s必备Addons安装_使用Flannel代替

master上执行：K8S Addons安装

git clone https://gitee.com/dukuan/k8s-ha-install.git
cd k8s-ha-install
! 切换到K8S集群初始化对应的分支(kubeadm---x86_64---1.30.14-150500.1.1---kubernetes---10 M)
git checkout manual-installation-v1.30.x
cd single/
! K8S Addons安装命令
kubectl apply -f .

1. 代替使用Flannel

1. kube-flannel.yml文件内容, 执行命令: kubectl apply -f kube-flannel.yml 执行安装

---
kind: Namespace
apiVersion: v1
metadata:
  name: kube-flannel
  labels:
    k8s-app: flannel
    pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  name: flannel
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes/status
  verbs:
  - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  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:
  labels:
    k8s-app: flannel
  name: flannel
  namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-flannel
  labels:
    tier: node
    k8s-app: flannel
    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",
      "EnableNFTables": false,
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
    k8s-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: ghcr.io/flannel-io/flannel-cni-plugin:v1.9.1-flannel1
        command:
        - cp
        args:
        - -f
        - /flannel
        - /opt/cni/bin/flannel
        volumeMounts:
        - name: cni-plugin
          mountPath: /opt/cni/bin
      - name: install-cni
        image: ghcr.io/flannel-io/flannel:v0.28.4
        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: ghcr.io/flannel-io/flannel:v0.28.4
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            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"
        - name: CONT_WHEN_CACHE_NOT_READY
          value: "false"
        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

2. Flannel常见问题

问题1: 镜像拉取失败

# 手动拉取镜像
crictl pull ghcr.io/flannel-io/flannel-cni-plugin:v1.9.1-flannel1
crictl pull ghcr.io/flannel-io/flannel:v0.28.4

问题2: Init容器卡住

# 创建必要目录
mkdir -p /opt/cni/bin
mkdir -p /etc/cni/net.d

# 检查权限
chmod 755 /opt/cni/bin
chmod 755 /etc/cni/net.d

问题3: 使用国内镜像加速

# 替换为国内镜像源
image: docker.io/flannel/flannel-cni-plugin:v1.9.1-flannel1
image: docker.io/flannel/flannel:v0.28.4

3. 验证Flannel安装

# 查看Flannel DaemonSet
kubectl get ds -n kube-flannel

# 查看Flannel Pod状态
kubectl get pods -n kube-flannel -o wide

# 查看Flannel日志
kubectl logs -n kube-flannel -l app=flannel

# 检查CNI配置是否生成
ls /etc/cni/net.d/
cat /etc/cni/net.d/10-flannel.conflist

4. 总结：Flannel的shell脚本

#!/bin/bash
# flannel-install.sh - 完整的Flannel安装验证脚本

set -e

echo "=== Flannel安装验证 ==="

# 1. 检查Flannel Pod状态
echo "1. 检查Flannel Pod状态..."
FLANNEL_PODS=$(kubectl get pods -n kube-flannel -l app=flannel -o jsonpath='{.items[*].status.phase}')
if [[ "$FLANNEL_PODS" == *"Running"* ]]; then
    echo "✅ Flannel Pods运行正常"
else
    echo "❌ Flannel Pods状态异常"
    exit 1
fi

# 2. 检查CNI配置
echo "2. 检查CNI配置..."
if [ -f /etc/cni/net.d/10-flannel.conflist ]; then
    echo "✅ CNI配置文件存在"
else
    echo "❌ CNI配置文件不存在"
    exit 1
fi

# 3. 检查节点状态
echo "3. 检查节点状态..."
READY_NODES=$(kubectl get nodes | grep -c Ready)
TOTAL_NODES=$(kubectl get nodes | grep -c -v NAME)
if [ "$READY_NODES" -eq "$TOTAL_NODES" ]; then
    echo "✅ 所有节点都Ready ($READY_NODES/$TOTAL_NODES)"
else
    echo "❌ 部分节点未就绪"
    kubectl get nodes
    exit 1
fi

# 4. 检查网络连通性
echo "4. 测试网络连通性..."
kubectl run ping-test --image=busybox --rm -it --restart=Never -- ping -c 3 8.8.8.8 > /dev/null 2>&1
if [ $? -eq 0 ]; then
    echo "✅ 网络连通性正常"
else
    echo "⚠️  网络连通性测试失败（可能需要额外配置）"
fi

echo "=== Flannel安装验证完成 ==="