centos 7 部署k8s集群 1.28.2版本

1. 准备工作（所有节点执行）

1.1. 准备虚拟机

本地部署，仅供参考。

三个节点：名字为k8s-node1、k8s-node2、k8s-master

设置系统主机名及Host 文件

sudo cat << EOF >> /etc/hosts
192.168.255.141 k8s-node1
192.168.255.142 k8s-node2
192.168.255.140 k8s-master
EOF

# 对应的节点执行
sudo hostnamectl set-hostname k8s-node1
sudo hostnamectl set-hostname k8s-node2
sudo hostnamectl set-hostname k8s-master

1.2 更新yum

# 需要更新很久
	sudo yum update -y
#设置存储库
    sudo yum install -y yum-utils
    sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

1.3 相关设置

1.3.1 禁用iptables和firewalld服务

systemctl stop firewalld
systemctl disable firewalld

systemctl stop iptables
systemctl disable iptables

1.3.2 禁用selinux

# 永久关闭
	sed -i 's/enforcing/disabled/' /etc/selinux/config
# 临时关闭
	setenforce 0

1.3.3 禁用swap分区

# 临时关闭
	swapoff -a
# 永久关闭
vim /etc/fstab
	将行 
	/dev/mapper/xxx    swap   xxx
	注释

1.3.4 调整内核参数，对于 K8S

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF
# 依次执行下面命令
sysctl -p
modprobe br_netfilter
lsmod | grep br_netfilter

显示：

1.3.5 配置 ipvs 功能

# 安装ipset和ipvsadm
	yum install ipset ipvsadmin -y
# 添加需要加载的模块写入脚本文件
cat <<EOF > /etc/sysconfig/modules/ipvs.modules
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
# 为脚本文件添加执行权限
	chmod +x /etc/sysconfig/modules/ipvs.modules
# 执行脚本文件
	 /bin/bash /etc/sysconfig/modules/ipvs.modules
# 查看对应的模块是否加载成功
	lsmod | grep -e ip_vs -e nf_conntrack_ipv4

显示：

重启

reboot

2. 安装docker和cri-dockerd（所有节点执行）

2.1 安装docker

2.1.1 移除旧版docker（新安装虚拟机则不需执行）

sudo yum remove docker \
     docker-client \
     docker-client-latest \
     docker-common \
     docker-latest \
     docker-latest-logrotate \
     docker-logrotate \
     docker-engine

2.1.2 安装docker及其依赖库

sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

2.1.3 启动Docker，设置开机自启动

# 启动docker
sudo systemctl start docker
# 设置docker开机启动
sudo systemctl enable docker
# 验证
sudo systemctl status docker

2.2 安装cri-dockerd

k8s 1.24版本后需要使用cri-dockerd和docker通信

2.2.1 下载cri-dockerd

# 若没有wget，则执行
	sudo yum install -y wget
# 下载
	sudo wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.4/cri-dockerd-0.3.4-3.el7.x86_64.rpm
# 安装
	sudo rpm -ivh cri-dockerd-0.3.4-3.el7.x86_64.rpm
# 重载系统守护进程
	sudo systemctl daemon-reload

2.2.2 设置镜像加速

sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://c12xt3od.mirror.aliyuncs.com"]
}
EOF

2.2.3 修改配置文件

修改第10行 ExecStart=
改为	ExecStart=/usr/bin/cri-dockerd --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.7

vi /usr/lib/systemd/system/cri-docker.service

2.2.4 自启动、重启Docker组件

# 重载系统守护进程
	sudo systemctl daemon-reload
# 设置cri-dockerd自启动
	sudo systemctl enable cri-docker.socket cri-docker
# 启动cri-dockerd
	sudo systemctl start cri-docker.socket cri-docker
# 检查Docker组件状态
	sudo systemctl status docker cir-docker.socket cri-docker

显示：

3. 安装Kubernetes

3.1 安装kubectl（所有节点执行）

#  当前使用的是最新版本 v1.28.2
# 下载
	curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
# 检验
	curl -LO "https://dl.k8s.io/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
	echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
# 安装
	sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
# 测试
	kubectl version --client

3.2 安装kubeadm（所有节点执行）

# 改国内源
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=1
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  
# 安装
	sudo yum install -y install kubeadm-1.28.2-0 kubelet-1.28.2-0 kubectl-1.28.2-0 --disableexcludes=kubernetes
# 设置自启动
	sudo systemctl enable --now kubelet

3.3 安装runc（所有节点执行）

# 下载 runc.amd64  
	sudo wget https://github.com/opencontainers/runc/releases/download/v1.1.9/runc.amd64
# 安装
	sudo install -m 755 runc.amd64 /usr/local/bin/runc
# 验证
	runc -v

3.4 部署集群

3.4.1 初始化集群（master节点执行）

# 执行 kubeadm  init 命令
kubeadm init  --node-name=k8s-master --image-repository=registry.aliyuncs.com/google_containers --cri-socket=unix:///var/run/cri-dockerd.sock --apiserver-advertise-address=192.168.255.140 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12

# 需要修改的参数
	--apiserver-advertise-address # 指定 API 服务器的广告地址、我设置为master节点的ip
	
# 初始化成功后运行下面的命令	
    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config

# master节点执行 配置文件的复制（为了在node节点可以使用kubectl相关命令）
	scp /etc/kubernetes/admin.conf 192.168.255.141:/etc/kubernetes/
	scp /etc/kubernetes/admin.conf 192.168.255.142:/etc/kubernetes/

显示：

3.4.2 node节点加入（node节点执行）

# 到node节点检查admin.conf文件是否传输完成
	ls /etc/kubernetes/
	admin.conf  manifests
# 将admin.conf加入环境变量，直接使用永久生效
	echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >>  ~/.bash_profile
# 加载
	source ~/.bash_profile
	
# ---------------------------------加入集群-------------------------------------
# 1.在master节点执行 kubeadm init成功后，会出现 kubeadm join xxx xxx的命令，直接复制到node节点执行就好。
# 2.下面是若没有复制到kubeadm join的命令或者是想要在集群中加入新节点，
#   则先在master执行，获取token 和 discovery-token-ca-cert-hash。
#   获取 token 参数
		kubeadm token list   # 查看已有 token
		kubeadm token create # 没有token则执行，创建新的 TOKEN
#   获取 discovery-token-ca-cert-hash 参数 
		openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null |  openssl dgst -sha256 -hex | sed 's/^.* //'

# 3.node节点执行 kubeadm join
# 修改获取的 token 和 discovery-token-ca-cert-hash 后，再执行
    kubeadm join 192.168.255.140:6443 --token y8v2nc.ie2ovh1kxqtgppbo --discovery-token-ca-cert-hash sha256:1fa593d1bc58653afaafc9ca492bde5b8e40e9adef055e8e939d4eb34fb436bf --cri-socket unix:///var/run/cri-dockerd.sock

3.4.3 重新加入集群（node节点执行）

# 先执行
	kubeadm reset --cri-socket unix:///var/run/cri-dockerd.sock
# 再获取TOKEN、discovery-token-ca-cert-hash 参数后，最后执行
	kubeadm join 192.168.255.140:6443 --token y8v2nc.ie2ovh1kxqtgppbo --discovery-token-ca-cert-hash sha256:1fa593d1bc58653afaafc9ca492bde5b8e40e9adef055e8e939d4eb34fb436bf --cri-socket unix:///var/run/cri-dockerd.sock

3.4.4 安装网络插件下载然后运行

# 下载，若网络抽风~~，则复制下面的kube-flannel.yml
	sudo wget https://github.com/flannel-io/flannel/releases/download/v0.22.3/kube-flannel.yml
# 执行
	kubectl apply -f kube-flannel.yml

或者

vi kube-flannel.yml

# kube-flannel.yml
apiVersion: v1
kind: Namespace
metadata:
  labels:
    k8s-app: flannel
    pod-security.kubernetes.io/enforce: privileged
  name: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: flannel
  name: flannel
  namespace: kube-flannel
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
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
- apiGroups:
  - networking.k8s.io
  resources:
  - clustercidrs
  verbs:
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
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
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"
      }
    }
kind: ConfigMap
metadata:
  labels:
    app: flannel
    k8s-app: flannel
    tier: node
  name: kube-flannel-cfg
  namespace: kube-flannel
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: flannel
    k8s-app: flannel
    tier: node
  name: kube-flannel-ds
  namespace: kube-flannel
spec:
  selector:
    matchLabels:
      app: flannel
      k8s-app: flannel
  template:
    metadata:
      labels:
        app: flannel
        k8s-app: flannel
        tier: node
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      containers:
      - args:
        - --ip-masq
        - --kube-subnet-mgr
        command:
        - /opt/bin/flanneld
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: EVENT_QUEUE_DEPTH
          value: "5000"
        image: docker.io/flannel/flannel:v0.22.3
        name: kube-flannel
        resources:
          requests:
            cpu: 100m
            memory: 50Mi
        securityContext:
          capabilities:
            add:
            - NET_ADMIN
            - NET_RAW
          privileged: false
        volumeMounts:
        - mountPath: /run/flannel
          name: run
        - mountPath: /etc/kube-flannel/
          name: flannel-cfg
        - mountPath: /run/xtables.lock
          name: xtables-lock
      hostNetwork: true
      initContainers:
      - args:
        - -f
        - /flannel
        - /opt/cni/bin/flannel
        command:
        - cp
        image: docker.io/flannel/flannel-cni-plugin:v1.2.0
        name: install-cni-plugin
        volumeMounts:
        - mountPath: /opt/cni/bin
          name: cni-plugin
      - args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        command:
        - cp
        image: docker.io/flannel/flannel:v0.22.3
        name: install-cni
        volumeMounts:
        - mountPath: /etc/cni/net.d
          name: cni
        - mountPath: /etc/kube-flannel/
          name: flannel-cfg
      priorityClassName: system-node-critical
      serviceAccountName: flannel
      tolerations:
      - effect: NoSchedule
        operator: Exists
      volumes:
      - hostPath:
          path: /run/flannel
        name: run
      - hostPath:
          path: /opt/cni/bin
        name: cni-plugin
      - hostPath:
          path: /etc/cni/net.d
        name: cni
      - configMap:
          name: kube-flannel-cfg
        name: flannel-cfg
      - hostPath:
          path: /run/xtables.lock
          type: FileOrCreate
        name: xtables-lock

3.5 测试kubernetes 集群

# 下面一般在master节点执行，若node节点可以使用kubectl命令，也可以在node节点上操作
kubectl get nodes
kubectl get pod -A		

显示：

3.5.1 使用nginx测试

vi nginx-deployment.yaml
kubectl apply -f nginx-deployment.yaml

# nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:latest
          ports:
            - containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
    - name: http 
      port: 80
      targetPort: 80
      nodePort: 30080
  type: NodePort

执行

[root@k8s-master k8s]# kubectl get pod,svc |grep nginx
pod/nginx-deployment-7c79c4bf97-4xzc9   1/1     Running   0          83s
pod/nginx-deployment-7c79c4bf97-lp4fn   1/1     Running   0          83s
pod/nginx-deployment-7c79c4bf97-vt8wh   1/1     Running   0          83s
service/nginx-service   NodePort    10.97.154.241   <none>        80:30080/TCP   83s

访问：http://192.168.255.140:30080/，出现这个页面就算大功告成！

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