基于Ubuntu-22.04安装K8s-v1.28.2实验（一）部署K8s
1 环境配置要求：
apt使用阿里云的源
设置主机名及解析，设定时钟同步，关闭swap和防火墙，开启IPv4转发。
更改机器名
hostnamectl set-hostname master
2.关闭swap和防火墙
swapoff -a
sed -i '/swap/s/^/#/' /etc/fstab
3.开启IPv4转发
每台机器都要设置
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
sysctl --system
sudo modprobe br_netfilter
echo '1' | sudo tee /proc/sys/net/bridge/bridge-nf-call-iptables
sudo nano /etc/sysctl.conf
在文件的末尾添加以下两行配置
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
sudo sysctl -p
sudo nano /etc/modules-load.d/br_netfilter.conf
在文件中添加以下内容：
br_netfilter
2安装containerd
curl -# -O https://mirrors.aliyun.com/docker-ce/linux/ubuntu/dists/jammy/pool/stable/amd64/containerd.io_1.6.26-1_amd64.deb
dpkg -i containerd.io_1.6.26-1_amd64.deb
#导出默认配置
containerd config default > /etc/containerd/config.toml
#修改containerd使用SystemdCgroup
SystemdCgroup = true
#配置containerd使用国内mirror站点上的pause镜像及指定版本
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"
#启动containerd服务
systemctl enable containerd
systemctl restart containerd
3配置crictl客户端
vim /etc/crictl.yaml
#输入
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: true
4安装kubuadm、kubelet、kubectl
apt update && apt install -y apt-transport-https curl
curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
apt update
apt install -y kubelet kubeadm kubectl
systemctl enable kubelet
5初始化master节点
拉取下载镜像
kubeadm config images pull --image-repository=registry.aliyuncs.com/google_containers --kubernetes-version="v1.28.2"
运行如下命令完成初始化
kubeadm init --kubernetes-version=v1.28.2 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --image-repository=registry.aliyuncs.com/google_containers --upload-certs
集群初始化成功显示：
设定kubectl
#复制认证为Kubernetes系统管理员的配置文件至当前用户root的家目录
root@master:~# mkdir .kube
root@master:~# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
root@master:~# ls .kube/
config
下图所示表示成功
部署网络插件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl apply -f kube-flannel.yml
加入节点
使用kubeadm join加入节点，节点要安装配置的项目跟kubeadm init以前的操作完全一致
kubeadm join 192.168.215.129:6443 --token 97pgmv.vxjakgynflgdh4zw --discovery-token-ca-cert-hash sha256:52163ce2f39c0ccc44558e7339c52bfd006c78944088efb2f94dcc57d424b816
下图所示，表示节点加入成功
部署应用
nginx-deployment.yml文件
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: default
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
kubectl apply nginx-deployment.yml
nginx-service.yml文件
apiVersion: v1
kind: Service
metadata:
name: nginx-service
namespace: default
spec:
selector:
app: nginx
#loadBalancerIP: 192.168.215.200
ports:
- protocol: TCP
port: 80
targetPort: 80
type: NodePort #NodePort LoadBalancer
kubectl apply -f nginx-service.yml
测试
curl 192.168.215.129:31370 #IP是母机地址，此地址返回部署成功页面
