centos kubernetes

在CentOS系统上安装Kubernetes集群，可以分为以下几个步骤：

1、环境准备

在开始安装Kubernetes之前，需要确保你的CentOS系统满足以下条件：

操作系统版本：CentOS 7.x或以上版本

硬件要求：至少2个CPU核心，4GB内存

网络环境：一个可用的互联网连接，用于下载Kubernetes安装包和相关组件

2、安装Docker

Kubernetes是基于容器技术的，因此在安装Kubernetes之前，需要先安装Docker，可以通过以下命令安装Docker：

更新系统软件包
sudo yum update y
安装依赖软件包
sudo yum install y yumutils devicemapperpersistentdata lvm2
添加Docker仓库
sudo yumconfigmanager addrepo https://download.docker.com/linux/centos/dockerce.repo
安装Docker
sudo yum install y dockerce
启动Docker并设置开机自启
sudo systemctl start docker
sudo systemctl enable docker

3、安装kubeadm、kubelet和kubectl

kubeadm、kubelet和kubectl是Kubernetes集群的核心组件，需要分别安装，可以通过以下命令安装：

安装kubeadm、kubelet和kubectl
sudo yum install y kubelet kubeadm kubectl

4、初始化Kubernetes集群

初始化Kubernetes集群是通过kubeadm命令完成的，创建一个名为“k8s”的配置文件：

sudo mkdir p /etc/kubernetes/config
sudo touch /etc/kubernetes/config/config.yaml

编辑配置文件，添加如下内容：

apiVersion: v1
clusters:
cluster:
    certificateauthoritydata: [根证书内容]
    server: https://[主节点地址]:6443
  name: kubernetes
contexts:
context:
    cluster: kubernetes
    user: kubernetesadmin
  name: kubernetesadmin@kubernetes
currentcontext: kubernetesadmin@kubernetes
kind: Config
preferences: {}
users:
name: kubernetesadmin
  user:
    clientcertificatedata: [客户端证书内容]
    clientkeydata: [客户端密钥内容]

注意：请将[根证书内容]、[主节点地址]、[客户端证书内容]和[客户端密钥内容]替换为实际的值，这些值可以在初始化过程中获得。

接下来，初始化Kubernetes集群：

sudo kubeadm init config /etc/kubernetes/config/config.yaml uploadcerts controlplaneendpoint "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT" servicecidr=LOAD_BALANCER_SUBNET podnetworkcidr=POD_NETWORK_CIDR nodename master hostnameoverride=<master.example.com apiserveradvertiseaddress=LOAD_BALANCER_IP allocatenodecidrs=true crisocket=/var/run/containerd/containerd.sock skipphases=addons,certificates,bootstraptokens,images,preparekubernetes v=5 experimentalcloudprovider=external cloudprovider=external allowprivileged=true servicednsdomain=cluster.local nodeploymenthardwarecertificates certificaterotate=false rotatecertificates=false etcddir=/var/lib/etcd datastore etcd publicaddress=LOAD_BALANCER_IP registrymirror=https://registry.aliyuncs.com disablecloudlb disablecloudflare disabledefaultcni podnetworkcidr=10.244.0.0/16 serviceclusteriprange=10.96.0.0/12 masqueradeall=true kubeletextraargs="cgroupdriver=systemd" kubeletinsecuretls=true kubeletpreferredaddresstypes=InternalIP,ExternalIP,Hostname enforcenodeallocatable="cpu=2,memory=2Gi" allowedunsafesysctls="kernel.msg*=10000" auditlogpath=/var/log/audit/audit.log auditpolicyfile=/etc/audit/audit.rules.json clientcafile=/etc/kubernetes/pki/ca.crt clientkeyfile=/etc/kubernetes/pki/apiserver.key tlscertfile=/etc/kubernetes/pki/apiserver.crt tlsprivatekeyfile=/etc/kubernetes/pki/apiserver.key serviceaccountsigningkeyfile=/etc/kubernetes/pki/sa.key serviceaccountkeyfile=/etc/kubernetes/pki/sa.pub etcdcafile=/etc/kubernetes/pki/etcd/ca.crt etcdkeyfile=/etc/kubernetes/pki/etcd/server.key etcdcertfile=/etc/kubernetes/pki/etcd/server.crt rootcafile=/etc/kubernetes/pki/ca.crt schedulercafile=/etc/kubernetes/pki/ca.crt schedulerkeyfile=/etc/kubernetes/pki/apiserver.key schedulercertfile=/etc/kubernetes/pki/apiserver.crt frontendcafile=/etc/kubernetes/pki/ca.crt frontendkeyfile=/etc/kubernetes/pki/frontendserving.key frontendcertfile=/etc/kubernetes/pki