CentOS7系统搭建kubeadm集群环境简记

一、初始化服务器

1、关闭防防火墙
  systemctl stop firewalld
  systemctl disable firewalld
2、关闭setlinux
  sed -i 's/enforcing/disabled/' /etc/selinux/config #永久关闭
  setenforce 0 #临时
3、设置主机名
hostnamectl  set-hostname
bash #让设置立即生效

master节点修该文件hosts:
cat >> /etc/hostname << EOF
192.168.159.200 k8smaster01
192.168.159.199 k8snode01
192.168.159.198 k8snode02
EOF

4、关闭swap
 sed -ri 's/.*swap.*/#&/' /etc/fstab #永久关闭 注意*swap.*
 swapoff -a #临时
 
5、将桥接的ipv4流量传递到iptable的
cat >> /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
 
执行生效 
  sysctl --system #生效

6、时间同步
 yum  install ntpdate -y
 ntpdate time.windows.com 
 
二、安装docker
1、wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo
   yum -y install docker-ce-18.06.1.ce-3.el7
   systemctl enable docker && systemctl start docker
   docker --version
   
   以上操作找不到docker版本,改操作如下:
   yum update
   yum list installed | grep docker #列出安装过的docker包
   #卸载旧版本 旧版名称是docker , 最新社区版 docker-engine, 目前已改名为docker-ce
   yum -y remove docker docker-common docker-selinux docker-engine 
   yum install -y yum-utils device-mapper-persistent-data lvm2 #设置Yum源
   yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo #使用阿里源访问
   yum list docker-ce --showduplicates | sort -r #查看所有仓库中docker版本
   
#有文件写入,无文件新建 
cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
 
#添加kubernetes yum 源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[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
 
yum install docker-ce (这样写默认安装最新版本)
yum install  docker-ce- (指定安装版本) 
例: yum install docker-ce-18.03.1.ce 

systemctl start docker     启动  
systemctl restart docker   重启
systemctl enable docker    开机启动
docker run hello-world  验证是否安装成功

三、安装kubeadm/kubelet/kubectl
#指定版本安装
yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0 
systemctl enable kubelet

注意:kubernetes 1.24+版本之后,docker必须要加装cir-docker

问题:Kubeadm初始化主节点遇到的坑:[ERROR CRI]: container runtime is not running:
解决:rm -rf /etc/containerd/config.toml 
            #执行 这个不生效,移到临时目录执行生效,暂时不理解: mv  /etc/containerd/config.toml  /tmp/
          systemctl restart containerd 
     
  #执行systemctl restart containerd报错:
  Failed to restart containerd.service: Unit not found [closed]无法重新启动 containerd.service:未找到单元 [关闭]
  解决:
  1.、从官方 Docker 存储库安装 containerd.io 包:
   yum install -y yum-utils
   yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
   yum install -y containerd.io
   2、配置  
    containerdsudo mkdir -p /etc/containerd
    containerd config default | sudo tee /etc/containerd/config.toml
   3、重启 containerd
   systemctl restart containerd   

四、安装kubernetes master

kubeadm init --apiserver-advertise-address=192.168.159.200 --image-repository registry.aliyuncs.com/google_containers --ignore-preflight-errors=Swap --kubernetes-version v1.18.0 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16


#初始化 kubeadm DNS镜像可能拉取失败,要单独拉取:
 docker pull coredns/coredns:1.8.0
 docker tag coredns/coredns:1.8.0 registry.aliyuncs.com/google_containers/coredns:v1.8.0
 
#安装完成后会输出如下操作指引,在master执行:
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
  #查看nodes节点
  kubectl get nodes
 
 #所有节点执行: 
  kubeadm join 192.168.159.200:6443 --token mtue5d.zjywgfag2clb7nzi \
    --discovery-token-ca-cert-hash sha256:f180c1869ce1948d298062a938d0e1ef83dbda47605f0c3aef152b1352f0dc8e
    
五、安装CNI或calico网络插件 
  1、wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kubeflannel.yml #下载kubeflannel.yml文件
  kubectl apply -f kube-flannel.yml
  #查看k8s启动状态
  kubectl get pods -n kube-system
  2、kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
   报错的话用这个:curl https://docs.projectcalico.org/v3.20/manifests/calico.yaml -O


六、测试k8s集群
#创建一个pod,验证是否正常运行
kubectl  create deployment  nginx --image=nginx
kubectl expose deployment nginx  --port=80  --type=NodePort
kubectl get pod,svc

访问地址:http:NodeIP:Port

卸载docker:
yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine

卸载k8s:
yum remove -y kubelet kubeadm kubectl
kubeadm reset -f
modprobe -r ipip
lsmod
rm -rf ~/.kube/
rm -rf /etc/kubernetes/
rm -rf /etc/systemd/system/kubelet.service.d
rm -rf /etc/systemd/system/kubelet.service
rm -rf /usr/bin/kube*
rm -rf /etc/cni
rm -rf /opt/cni
rm -rf /var/lib/etcd
rm -rf /var/etcd

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