使用kubeadm 部署k8s--v1.25.2版本

一、环境要求

  资源:至少2c2g10gb 的资源

  hosts:

192.168.100.50  master
192.168.100.51 node1
192.168.100.52 node2

  系统:centos 7 、Kernel: Linux 3.10.0

二、基础环境配置(所有节点执行):

  1、配置hostname

    方法一、# vim /etc/hostname    配置相应的主机名

    方法二、hostnamectl set-hostname master     
  2、配置时钟,保持所以主机时钟一致。

  3、 关闭防火墙和selinux  

systemctl stop firewalld
systemctl   disable firewalld
sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config
setenforce 0 

  4、关闭swap

    禁用交换分区。为了保证 kubelet 正常工作,你必须禁用交换分区。

    # swapoff -a

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

  5、配置repo 安装 containerd、kubelet、kubeadm、kubectl  

###### 配置docker-ce源安装 containerd
Step 1: 安装必要的一些系统工具
    yum install -y yum-utils device-mapper-persistent-data lvm2
Step 2: 添加软件源信息
    yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Step 3
    sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo


######配置kubernetes 源
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
epo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
EOF

 

三、安装及配置(所有节点执行

  1、部署 containerd

  Kubernates 中 pod 的运行必须有容器运行环境,以前 kubernetes 是使用 Docker,后面主要使用 containerd 等,只安装 containerd 即可

    a、移除可能安装过的 Docker 包

      # yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine

    b、安装 yum-utils

      # yum install -y yum-utils

    c、安装 containerd

      # yum install containerd.io -y

    d、配置 containerd

      I、设置开机自启和

        # systemctl enable containerd

        #systemctl start containerd

      II、修改 containerd 使用 systemd   

containerd  config default > /etc/containerd/config.toml
sed -i 's#k8s.gcr.io#registry.aliyuncs.com/google_containers#g' /etc/containerd/config.toml
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

      III、重启 containerd

# systemctl daemon-reload
# systemctl enable --now containerd
# systemctl restart  containerd

 

  2、部署 kubernetes组件 kubelet、kubeadm、kubectl  

    a、安装并配置自启动

      # yum install -y --nogpgcheck kubelet kubeadm kubectl

      # systemctl enable kubelet

 

    b、配置 kubernetes

      I、确认iptables 参数 为一:
        # cat /proc/sys/net/bridge/bridge-nf-call-ip6tables
        # cat /proc/sys/net/bridge/bridge-nf-call-iptables

      II、通用配置项

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

        # modprobe overlay

        # modprobe br_netfilter

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        #生效以上配置

 

    c、安装和设置 crictl

      # VERSION="v1.23.0"

      # curl -L https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/crictl-${VERSION}-linux-amd64.tar.gz --output crictl-${VERSION}-linux-amd64.tar.gz

      #crictl config --set runtime-endpoint=unix:///run/containerd/containerd.sock

 

四、初始化集群

  1、初始化master  (只在master节点执行)

    # kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=192.168.101.0/24 --service-cidr=192.168.102.0/24 --ignore-preflight-errors=all

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/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.100.50:6443 --token iudv2k.654tkstlx3if0ox0 --discovery-token-ca-cert-hash sha256:e2c640adbc1cc16c3819360ead74e78236de9c1a1190fcc747019924d1d17288 

  2、按照成功提示 执行相应操作(只在master节点执行):

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

  

  3、node节点加入集群(只在node节点执行在master 初始化完成时的提示命令):

    # kubeadm join 192.168.100.50:6443 --token iudv2k.654tkstlx3if0ox0 --discovery-token-ca-cert-hash sha256:e2c640adbc1cc16c3819360ead74e78236de9c1a1190fcc747019924d1d17288 

 

  4、查看结果: kubectl get nodes  

kubectl get nodes
NAME      STATUS     ROLES           AGE   VERSION
master   NotReady   control-plane   47s   v1.25.2
node1     NotReady   <none>          19s   v1.25.2
node2     NotReady   <none>          2s    v1.25.2

    节点加入集群后,起初是NotReady的,这是正常的,我们需要进行网络配置,安装 calico

 

五、配置网络插件 calico

  1、安装插件:

    # kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

    操作完成后稍等一会儿就会自动处于Ready状态。

    

     

  2、如果一直没有变为Ready状态,切查看message 日志一直在报错:cni plugin not initialized

     

     解决办法如下,具体参考:https://github.com/flannel-io/flannel/issues/1236

cat <<EOL > /etc/cni/net.d/10-flannel.conflist 
{
  "name": "cbr0",
  "cniVersion": "0.3.1",
  "plugins": [
    {
      "type": "flannel",
      "delegate": {
        "hairpinMode": true,
        "isDefaultGateway": true
      }
    },
    {
      "type": "portmap",
      "capabilities": {
        "portMappings": true
      }
    }
  ]
}
EOL

#查看
cat /etc/cni/net.d/10-flannel.conflist 
ifconfig cni0
posted @ 2022-10-15 23:14  语~默  阅读(599)  评论(0编辑  收藏  举报