一.基础设置

1. 设置主机名

hostnamectl set-hostname master
hostnamectl set-hostname node01

vim /etc/hosts
172.31.187.45 master
172.31.187.44 node01

2. ssh免登

ssh-keygen #node生成密钥,一路回车

ssh-copy-id user@host #master拷贝密钥

3. 关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

4. 禁用SELINUX

# 将 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

5. 关闭swap分区

swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab

6. 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

7. 放行端口

控制平面节点

工作节点

二. 安装docker

yum install docker

systemctl start docker.service
systemctl enable docker.service

三. 安装kubeadm,kubelet,kubectl

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

sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

sudo systemctl enable --now kubelet

四. 集群安装

1. 初始化集群

国内环境建议提前准备所需镜像以避免kubeadm init失败

查看所需镜像

kubeadm config images list

k8s.gcr.io/kube-apiserver:v1.22.2
k8s.gcr.io/kube-controller-manager:v1.22.2
k8s.gcr.io/kube-scheduler:v1.22.2
k8s.gcr.io/kube-proxy:v1.22.2
k8s.gcr.io/pause:3.5
k8s.gcr.io/etcd:3.5.0-0
k8s.gcr.io/coredns/coredns:v1.8.4

下载镜像(国内环境需要代理)

vim images_list.sh

#!/bin/bash
images_list='k8s.gcr.io/kube-apiserver:v1.22.2
k8s.gcr.io/kube-controller-manager:v1.22.2
k8s.gcr.io/kube-scheduler:v1.22.2
k8s.gcr.io/kube-proxy:v1.22.2
k8s.gcr.io/pause:3.5
k8s.gcr.io/etcd:3.5.0-0
k8s.gcr.io/coredns/coredns:v1.8.4'
for img in ${images_list}
        do
        docker pull ${img}
        done
        
 sh images_list.sh

初始化

需要注意的是,如果使用腾讯云,apiserver-advertise-address需要设置为内网IP (eth0网卡IP地址)

kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=172.31.187.45

2. 设置KUBECONFIG

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

export KUBECONFIG=/etc/kubernetes/admin.conf

3. flannel网络

国内服务器会因为镜像下载失败导致设置失败,需要手动安装镜像

1. 查看yml中镜像版本,到https://github.com/coreos/flannel/releases 官方仓库下载相应镜像手动导入

docker load < flanneld-v0.14.0-amd64.docker

2. 修改tag名使其与yam文件中镜像名保持一致

docker tag 8522d622299c quay.io/coreos/flannel:v0.14.0

3. kubectl apply

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

4. node节点加入集群

kubeadm join 172.31.187.45:6443 --token 8xvtce.sjvzzaqkg9dp7375 --discovery-token-ca-cert-hash sha256:03c4632898741c6e0e8d3455dfe9781cf083848c8a16e73fb72690974aa34f59

5. 查看集群信息

kubectl get nodes

kubectl get pods --namespace kube-system

kubectl get cs

如果出现controller-manager scheduler

Unhealthy Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused

image-20210927231712325

则需要修改以下配置文件

/etc/kubernetes/manifests/kube-controller-manager.yaml

/etc/kubernetes/manifests/kube-scheduler.yaml

将相应文件中的

- --port=0

这一行注释掉,过一会再查看就正常了.

6. 测试

# 部署hello-world
kubectl run hello-world --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0  --port=8080

# 集群信息
kubectl get deployments hello-world
kubectl describe deployments hello-world

kubectl get replicasets
kubectl describe replicasets

# 创建service
kubectl expose deployment hello-world --type=NodePort --name=example-service

# 查看service
kubectl describe services example-service

kubectl get pods --selector="run=load-balancer-example" --output=wide

7. 安装dashboard

# 安装dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

# 删除dashboard
kubectl -n kube-system delete $(kubectl -n kube-system get pod -o name | grep dashboard)