！！！！！版本！！！！

使用公网初始化 Kubernetes 需要 Kubernetes 版本 1.19 或更高版本。在早期的版本中，Kubernetes 还不支持公网初始化。因此，请确保您使用的 Kubernetes 版本符合要求。

解决核心

在主体文章中提到如果需要部署k8s的时候，有两个方式要么这些服务器就在一个内网分区中，保证服务器中间使用内网ip是可以相互ping通的。

本篇文章：核心

在实际业务中的场景可能会使用了很多不同运营商的环境来提供搭建生态环境（降本增效）。所以本附属文章来解决这个问题。

1、环境搭建

创建虚拟网卡（每台机器都需要执行）

因为k8s在搭建环境的是默认使用都是内网ip，而且在几台服务器在不同的运行商中的时候导致直接搭建使用内网ip注册进入集群进行搭建，导致访问不到出现问题导致不成功。

创建网卡：使用虚拟网卡来绑定公网ip,使用该公网ip来注册进入集群

# 所有主机都要创建虚拟网卡，并绑定对应的公网 ip
# 临时生效，重启会失效
ifconfig eth0:1 <你的公网IP>
 
# 永久生效
cat > /etc/sysconfig/network-scripts/ifcfg-eth0:1 <<EOF
BOOTPROTO=static
DEVICE=eth0:1
IPADDR=ip公网
PREFIX=32
TYPE=Ethernet
USERCTL=no
ONBOOT=yes
EOF

在服务器上创建虚拟网卡的作用主要有以下几点：

增加网络连接的灵活性和可用性：通过创建多个虚拟网卡，可以在同一台服务器上连接多个不同的网络接口，实现不同的网络服务。这样，即使一个物理网卡出现故障，也不会导致所有网络连接中断。
实现网络隔离和安全：虚拟网卡可以模拟不同的网络设备，如路由器、网桥、交换机等，从而可以实现不同的网络服务之间的隔离和资源分配。这有助于提高网络安全性和稳定性。
支持多种网络服务：虚拟网卡可以支持多种网络服务，如虚拟专用网络（VPN）、虚拟局域网（VLAN）、软件定义网络（SDN）等，以满足不同的业务需求。
提高网络性能：虚拟网卡可以同时处理多个网络连接，从而提高服务器整体的吞吐量和性能。

总之，在服务器上创建虚拟网卡可以提高网络的灵活性和可用性，实现网络隔离和安全，支持多种网络服务，并提高网络性能。

服务器的配置（每台机器都需要执行）

SELinux 设置为 permissive 模式（相当于将其禁用）

sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

关闭swap

# 临时关闭swap分区，当前会话生效，重启失效
swapoff -a  
# 永久关闭swap分区
sed -ri 's/.*swap.*/#&/' /etc/fstab

允许 iptables 检查桥接流量

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
 
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system

安装docker（每台机器都需要执行）

安装docker ce

curl -o /etc/yum.repos.d/docker-ce.repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

配置Kubernetes的yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

清理yum缓存

 yum clean all && yum makecache

查看所有可用的版本

yum list docker-ce --showduplicates | sort -r

安装最新的docker

yum install docker-ce

配置docker加速

创建文件夹

mkdir -p /etc/docker

编辑docker配置文件

vi /etc/docker/daemon.json

写入配置文件

{
  "insecure-registries": [    
    "masterip!!!:5000" 
  ],                          
  "registry-mirrors" : [
    "https://8xpk5wnt.mirror.aliyuncs.com"
  ]
}

启动docker

systemctl enable docker && systemctl start docker

安装Kubernetes更改设置以及配置

安装kubelet、kubeadm、kubectl（每台机器都需要执行）

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
   http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF
 
 
sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes
 
sudo systemctl enable --now kubelet

安装kubeadm引导集群（每台机器都需要执行）

sudo tee ./images.sh <<-'EOF'
#!/bin/bash
images=(
kube-apiserver:v1.20.9
kube-proxy:v1.20.9
kube-controller-manager:v1.20.9
kube-scheduler:v1.20.9
coredns:1.7.0
etcd:3.4.13-0
pause:3.2
)
for imageName in ${images[@]} ; do
docker pull registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/$imageName
done
EOF
   
chmod +x ./images.sh && ./images.sh

修改kubelet启动参数文件（每台机器都需要执行）

# 此文件安装kubeadm后就存在了
vim /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
 
# 注意，这步很重要，如果不做，节点仍然会使用内网IP注册进集群
# 在末尾添加参数 --node-ip=公网IP
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS --node-ip=<公网IP>

添加配置文件（只在master 主节点执行）

# 添加配置文件，注意替换下面的IP
cat > kubeadm-config.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.20.9
apiServer:
  certSANs: 
  - master        #请替换为hostname
  - xx.xx.xx.xx   #请替换为公网IP
  - xx.xx.xx.xx   #请替换为私网IP
  - 10.96.0.1
controlPlaneEndpoint: xx.xx.xx.xx:6443 #替换为公网IP
imageRepository: registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images
networking:
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.96.0.0/12
--- 
apiVersion: kubeproxy-config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
  SupportIPVSProxyMode: true
mode: ipvs
EOF

主节点初始化（只在master 主节点执行）

初始化代码

kubeadm init --config=kubeadm-config.yaml

1、需要执行这个命令

2、提示我们需要安装网络插件

3、如果添加master节点执行的命令

4、如果需要添加node节点执行的命令

执行1框中命令

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

修改kube-apiserver参数（master，只修改注释项，其余的不要动）

# 修改两个信息，添加--bind-address和修改--advertise-address
vim /etc/kubernetes/manifests/kube-apiserver.yaml
 
apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 10.0.20.8:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=xx.xx.xx.xx # 修改为公网IP
    - --bind-address=0.0.0.0  # 新增参数
    - --allow-privileged=true
    - --authorization-mode=Node,RBAC
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --enable-admission-plugins=NodeRestriction
    - --enable-bootstrap-token-auth=true
    - --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
    - --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
    - --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
    - --etcd-servers=https://127.0.0.1:2379
    - --insecure-port=0
    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
    - --requestheader-allowed-names=front-proxy-client
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --requestheader-extra-headers-prefix=X-Remote-Extra-
    - --requestheader-group-headers=X-Remote-Group
    - --requestheader-username-headers=X-Remote-User
    - --secure-port=6443
    - --service-account-issuer=https://kubernetes.default.svc.cluster.local
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --service-account-signing-key-file=/etc/kubernetes/pki/sa.key
    - --service-cluster-ip-range=10.96.0.0/12
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    image: registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/kube-apiserver:v1.20.9
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 10.0.20.8
        path: /livez
        port: 6443
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    name: kube-apiserver
    readinessProbe:
      failureThreshold: 3
      httpGet:
        host: 10.0.20.8
        path: /readyz
        port: 6443
        scheme: HTTPS
      periodSeconds: 1
      timeoutSeconds: 15
    resources:
      requests:
        cpu: 250m
    startupProbe:
      failureThreshold: 24
      httpGet:
        host: 10.0.20.8
        path: /livez
        port: 6443
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    volumeMounts:
    - mountPath: /etc/ssl/certs
      name: ca-certs
      readOnly: true
    - mountPath: /etc/pki
      name: etc-pki
      readOnly: true
    - mountPath: /etc/kubernetes/pki
      name: k8s-certs
      readOnly: true
  hostNetwork: true
  priorityClassName: system-node-critical
  volumes:
  - hostPath:
      path: /etc/ssl/certs
      type: DirectoryOrCreate
    name: ca-certs
  - hostPath:
      path: /etc/pki
      type: DirectoryOrCreate
    name: etc-pki
  - hostPath:
      path: /etc/kubernetes/pki
      type: DirectoryOrCreate
    name: k8s-certs
status: {}

安装flannel网络插件（只在master 主节点执行）

flanel Git地址：flannel

# 1、下载flannel配置文件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

修改 kube-flannel.yml 内容，如下：

vim kube-flannel.yml

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: psp.flannel.unprivileged
  annotations:
    seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
    seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
    apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
    apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
  privileged: false
  volumes:
  - configMap
  - secret
  - emptyDir
  - hostPath
  allowedHostPaths:
  - pathPrefix: "/etc/cni/net.d"
  - pathPrefix: "/etc/kube-flannel"
  - pathPrefix: "/run/flannel"
  readOnlyRootFilesystem: false
  # Users and groups
  runAsUser:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  fsGroup:
    rule: RunAsAny
  # Privilege Escalation
  allowPrivilegeEscalation: false
  defaultAllowPrivilegeEscalation: false
  # Capabilities
  allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
  defaultAddCapabilities: []
  requiredDropCapabilities: []
  # Host namespaces
  hostPID: false
  hostIPC: false
  hostNetwork: true
  hostPorts:
  - min: 0
    max: 65535
  # SELinux
  seLinux:
    # SELinux is unused in CaaSP
    rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: flannel
rules:
- apiGroups: ['extensions']
  resources: ['podsecuritypolicies']
  verbs: ['use']
  resourceNames: ['psp.flannel.unprivileged']
- 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-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-system
  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",  # 这里是kubeadm-config.yaml配置的podsnetwork
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-system
  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
        image: quay.io/coreos/flannel:v0.14.0
        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: quay.io/coreos/flannel:v0.14.0
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        - --public-ip=$(PUBLIC_IP)  # 新增
        - --iface=eth0   # 新增
        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: PUBLIC_IP #新增
          valueFrom:   #新增
            fieldRef: #新增
              fieldPath: status.podIP #新增
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
      - name: run
        hostPath:
          path: /run/flannel
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg

使用修改好的配置文件创建网络插件

kubectl apply -f kube-flannel.yml

将节点1和节点2加入集群

之前生成的令牌是24小时的，如果失效直接重新获取就行。

kubeadm token create --print-join-command

验证集群

在master节点上使用

kubectl get nodes

来验证集群

部署dashboard（只在master 主节点执行）

kubernetes--技术文档-真--集群搭建-三台服务器一主二从（非高可用）附属文档-使用不同运行商服务器-搭建公网集群