一、虚拟机网络配置

二、环境准备

1. 关闭防火墙

临时关闭防火墙

js
systemctl stop firewalld

永久关闭防火墙

js
systemctl disable firewalld

2. 关闭内存交换分区

js
swapoff -a

js
vim /etc/fstab
# 注释 swap 行

3.关闭selinux

js
setenforce 0	

4.同步服务器时间

js
yum install ntpdate -t
ntpdate -u ntp.aliyun.com

三、配置虚拟机静态IP

js
cd /etc/sysconfig/network-scripts

1. 修改网络配置

js
vi ifcfg-配置_1

2.修改完成后重启网卡

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service network restart

四、配置好三台虚拟机

1. IP为：192.168.201.100、192.168.201.101、192.168.201.102、192.168.201.103
2. 修改主机名加入host中

js
hostnamectl set-hostname  k8s-Master01
hostnamectl set-hostname  k8s-node01
hostnamectl set-hostname  k8s-node02
hostnamectl set-hostname  k8s-register

js
cat >> /etc/hosts <<EOF
192.168.201.100 k8s-Master01
192.168.201.101  k8s-node01
192.168.201.102  k8s-node02
192.168.201.103  k8s-register
EOF

3. 由于centos7原来的yum源使用不了，需要修改yum源 先进行备份yum源文件

js
cd /etc/yum.repos.d/
mkdir backup
mv *.repo backup/

4. 配置阿里云镜像源

js
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

5. 重新建立缓存

js
yum clean all
yum makecache

五、安装containerd

1. 安装 yum-config-manager 相关依赖

js
yum install -y yum-utils device-mapper-persistent-data lvm2

2. 添加 containerd yum 源

js
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

3. 安装 containerd

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yum install  -y containerd.io cri-tools  

4. 配置 containerd

js
cat >  /etc/containerd/config.toml <<EOF
disabled_plugins = ["restart"]
[plugins.linux]
shim_debug = true
[plugins.cri.registry.mirrors."docker.io"]
endpoint = ["https://frz7i079.mirror.aliyuncs.com"]
[plugins.cri]
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.2"
EOF

5. 启动 containerd 服务 并 开机配置自启动

js
systemctl enable containerd && systemctl start containerd && systemctl status containerd

6. 配置 containerd 配置

js
cat > /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF

7. 配置 k8s 网络配置

js
cat  > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

8. 加载 overlay br_netfilter 模块

js
modprobe overlay
modprobe br_netfilter

9. 查看当前配置是否生效

js
sysctl -p /etc/sysctl.d/k8s.conf

六、安装K8S集群

1. 添加源

js
yum repolist

js
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

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

2. 安装 k8s

js
# 安装最新版本
yum install -y kubelet kubeadm kubectl

# 指定版本安装
yum install -y kubelet-1.26.0 kubectl-1.26.0 kubeadm-1.26.0

# 启动 kubelet
systemctl enable kubelet && sudo systemctl start kubelet && sudo systemctl status kubelet

3. 初始化集群，注意！！！只需要控制节点执行（master节点）。

js
kubeadm init \
--apiserver-advertise-address=192.168.201.100 \
--pod-network-cidr=10.244.0.0/16 \
--image-repository registry.aliyuncs.com/google_containers \
--cri-socket=unix:///var/run/containerd/containerd.sock

4. 初始化完成后，使用工作节点加入集群

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

5. 使用截图的秘钥加入K8S集群

js
kubeadm join 192.168.201.100:6443 --token n78quj.0nbr6yv0qr74pq6h \
        --discovery-token-ca-cert-hash sha256:a4e2aec71acd6d66d80fea93fad446ae5a3f78ab024ef59c8560c6b861451d31

6. 配置集群网络

js
vi kube-flannel.yml

yaml
---
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:v1.7.1-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:v0.27.2
        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:v0.27.2
        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