如果有些地方不明白，建议观看本人在B站的教程
准备环境
尽量用centos7.9搭建低于centos.7.9要升级内核
centos7.9
主机名：master 系统：centos7.9
主机名：node 系统：centos7.9
所有主机都需要执行如下命令
关闭防火墙和selinux
systemctl stop firewalld
systemctl disable firewalld
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0
关闭swap分区
swapoff -a # 临时关闭
vm /etc/fstab # 注释到swap那一行 永久关闭
添加主机名与IP对应关系
[root@master ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.4.247 master.novalocal
192.168.200.161 node
转发 IPv4 并让 iptables 看到桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# 设置所需的 sysctl 参数，参数在重新启动后保持不变
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
# 应用 sysctl 参数而不重新启动
sudo sysctl --system
通过运行以下指令确认 br_netfilter 和 overlay 模块被加载：
lsmod | grep br_netfilter
lsmod | grep overlay
安装containerd
# step 1: 安装必要的一些系统工具
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
# Step 2: 添加软件源信息
sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# Step 3
sudo sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
# Step 4: 更新并安装Docker-CE
sudo yum makecache fast
sudo yum -y install docker-ce
# 创建默认配置文件
containerd config default > /etc/containerd/config.toml
# 设置aliyun地址，不设置会连接不上, 如果无法下载镜像检查一下配置是否替换 cat /etc/containerd/config.toml |grep sandbox_image
sed -i "s#registry.k8s.io/pause#registry.aliyuncs.com/google_containers/pause#g" /etc/containerd/config.toml
# 设置驱动为systemd
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
# 设置dicker地址为aliyun镜像地址
sed -i '/\[plugins\."io\.containerd\.grpc\.v1\.cri"\.registry\.mirrors\]/a\ [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]\n endpoint = ["https://8aj710su.mirror.aliyuncs.com" ,"https://registry-1.docker.io"]' /etc/containerd/config.toml
# 重启服务
systemctl daemon-reload
systemctl enable --now containerd
systemctl restart containerd
安装kubelet kubeadm kubectl 和crictl工具
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
setenforce 0
# 安装crictl工具
yum install -y cri-tools
# 生成配置文件
crictl config runtime-endpoint
# 编辑配置文件
cat << EOF | tee /etc/crictl.yaml
runtime-endpoint: "unix:///run/containerd/containerd.sock"
image-endpoint: "unix:///run/containerd/containerd.sock"
timeout: 10
debug: false
pull-image-on-create: false
disable-pull-on-run: false
EOF
# 查看是否安装成功,和docker命令差不多
crictl info
crictl images
# 安装kube软件
yum install -y kubelet-1.27.0 kubeadm-1.27.0 kubectl-1.27.0
systemctl enable kubelet && systemctl start kubelet
master节点执行初始化
apiserver-advertise-address=修改成masterIP
kubeadm init \
--apiserver-advertise-address=192.168.5.215 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.27.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16 \
--ignore-preflight-errors=all
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
node节点器执行
master初始化完成会提供这段命令，直接复制就可以
kubeadm join 192.168.137.131:6443 --token cuyawq.2mrgrt9q6uxrhquw \
--discovery-token-ca-cert-hash sha256:dc878dc1667c7c927ebfae7875a699f96efd99a72147facaa93187a7b057ef6f
master节点网络插件安装
wget https://github.com/flannel-io/flannel/releases/download/v0.21.5/kube-flannel.yml
kubectl create -f kube-flannel.yml
等待所以pod全部runing即可
测试test
kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort
# 查看
kubectl get pod,svc
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