centos

CentOS上Kubernetes集群如何搭建

小樊
34
2025-04-12 23:28:21
栏目: 智能运维

在CentOS上搭建Kubernetes集群可以按照以下步骤进行:

部署前操作

  1. 设置时间同步
    yum -y install chronys
    systemctl start chronyd
    systemctl enable chronyd
    chronyc sources
    
  2. 名称解析: 编辑 /etc/hosts 文件,设置各节点的主机名。
  3. 关闭防火墙和SELinux
    systemctl stop firewalld
    systemctl disable firewalld
    iptables -F
    setenforce 0
    sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config
    
  4. 禁用Swap
    swapoff -a
    sed -ri 's/.*swap.*/#&/' /etc/fstab
    
  5. 打开IP转发和桥接功能
    echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
    cat >> /etc/sysctl.d/k8s.conf << EOF
    net.bridge.bridge-nf-call-iptables = 1
    net.bridge.bridge-nf-call-ip6tables = 1
    EOF
    sysctl -p /etc/sysctl.d/k8s.conf
    

部署Kubernetes集群

  1. 安装Docker
    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
    systemctl enable docker
    systemctl start docker
    docker --version
    
  2. 配置Kubernetes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=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
    EOF
    
  3. 安装Kubernetes组件
    yum -y install kubelet kubectl kubeadm
    systemctl enable kubelet
    
  4. 初始化Master节点
    kubeadm version
    kubeadm init --kubernetes-version="v1.21.0" --pod-network-cidr=10.0.244.0/16 --image-repository registry.aliyuncs.com/google_containers
    
    如果找不到镜像,可以从Docker Hub拉取。
  5. 配置kubectl
    mkdir -p $HOME/.kubes
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config
    export KUBECONFIG=$HOME/.kube/config
    

以上步骤涵盖了从系统准备到Kubernetes集群初始化的整个过程。

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