kubernet 笔记

kubeadm

1、所有机器执行以下操作

• #各个机器设置自己的域名， 方便识别不设置也可以， 注意： 集群中name必须唯一
  hostnamectl set-hostname xxxx
  # 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
  
  #关闭swap
  swapoff -a  
  sed -ri 's/.*swap.*/#&/' /etc/fstab
  
  #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
  2、 安装kubelet、kubeadm、kubectl

  cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
  [kubernetes]
  name=Kubernetes
  baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
  enabled=1
  gpgcheck=0
  repo_gpgcheck=0
  gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
     http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
  exclude=kubelet kubeadm kubectl
  EOF
  sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes
  
  sudo systemctl enable --now kubelet

  3、使用kubeadm引导集群

  下载各个机器需要的镜像

  sudo tee ./images.sh <<-'EOF'
  #!/bin/bash
  images=(
  kube-apiserver:v1.20.9
  kube-proxy:v1.20.9
  kube-controller-manager:v1.20.9
  kube-scheduler:v1.20.9
  coredns:1.7.0
  etcd:3.4.13-0
  pause:3.2
  )
  for imageName in ${images[@]} ; do
  docker pull registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/$imageName
  done
  EOF
     
  chmod +x ./images.sh && ./images.sh
  注意：主节点全都需要； 从节点其实只需要 kube-proxy
  初始化主节点：

  #所有机器添加master域名映射， 【172.31.0.4】为master节点私网IP，以下需要修改为自己的
  echo "172.31.0.4  cluster-endpoint" >> /etc/hosts
  
  

  
  #主节点初始化
  kubeadm init \
  --apiserver-advertise-address=172.31.0.4 \
  --control-plane-endpoint=cluster-endpoint \
  --image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \
  --kubernetes-version v1.20.9 \
  --service-cidr=10.96.0.0/16 \
  --pod-network-cidr=192.168.0.0/16
  
  注意：
      1、所有网络范围不重叠
      2、172.31.0.4 是你的master IP
      3、cluster-endpoint 自定义的master IP 域名映射
      4、registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images   镜像仓库
      5、10.96.0.0/16 K8S内部服务的IP分配范围
      6、192.168.0.0/16 pod网络IP分配范围
  

  #所有机器添加master域名映射， 【172.31.0.4】为master节点私网IP，以下需要修改为自己的
  echo "172.31.0.4  cluster-endpoint" >> /etc/hosts
  
  

  
  #主节点初始化
  kubeadm init \
  --apiserver-advertise-address=172.31.0.4 \
  --control-plane-endpoint=cluster-endpoint \
  --image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \
  --kubernetes-version v1.20.9 \
  --service-cidr=10.96.0.0/16 \
  --pod-network-cidr=192.168.0.0/16
  
  注意：
      1、所有网络范围不重叠
      2、172.31.0.4 是你的master IP
      3、cluster-endpoint 自定义的master IP 域名映射
      4、registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images   镜像仓库
      5、10.96.0.0/16 K8S内部服务的IP分配范围
      6、192.168.0.0/16 pod网络IP分配范围

  执行初始化信息如下：
  

  Your Kubernetes control-plane has initialized successfully!
  
  To start using your cluster, you need to run the following as a regular user:
  
    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config
  
  Alternatively, if you are the root user, you can run:
  
    export KUBECONFIG=/etc/kubernetes/admin.conf
  
  You should now deploy a pod network to the cluster.
  Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
    https://kubernetes.io/docs/concepts/cluster-administration/addons/
  
  You can now join any number of control-plane nodes by copying certificate authorities
  and service account keys on each node and then running the following as root:
  
    kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
      --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3 \
      --control-plane 
  
  Then you can join any number of worker nodes by running the following on each as root:
  
  kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
      --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3

   

   mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config
  安装网络组件Calico

  curl https://docs.projectcalico.org/archive/v3.20/manifests/calico.yaml -O
  
  kubectl apply -f calico.yaml
  
  # 注意：
      如果改了pod网络分配范围，需要进入calico.yaml 中修改

              打开192.168.0.0.0/16 注释， 换成你自己的

      添加主节点：（注意： 初始化的主节点是不需要重复加入了）

  kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
      --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3 \
      --control-plane 
  添加从节点：

  # 这个命令24h有效
  kubeadm join cluster-endpoint:6443 --token x5g4uy.wpjjdbgra92s25pp \
      --discovery-token-ca-cert-hash sha256:6255797916eaee52bf9dda9429db616fcd828436708345a308f4b917d3457a22
  
  # 新令牌获取
  kubeadm token create --print-join-command
  
  

  高可用部署方式，也是在这一步的时候，使用添加主节点的命令即可