yum安装k8s集群----基于centos7.9

一、环境搭建

1、准备环境

计算机说明，建议系统版本centos7.9

|------------|-----------------|-------------|-----------------------------------------------------------------------|
| 主机名 | IP 地址 | 角色 | 硬件 |
| k8s-master | 192.168.100.131 | Master，node | Etcd、apiserver、controlor-manager、scheduler、kube-proxy、docker、registry |
| K8s-node1 | 192.168.100.132 | Node | Kubelet、kube-proxy、docker |
| K8s-node2 | 192.168.100.133 | Node | Kubelet、kube-proxy、docker |

2、关闭防火墙

bash 复制代码

[root@huyang1 ~]# systemctl stop firewalld
[root@huyang1 ~]# iptables -F
[root@huyang1 ~]# setenforce 0

3、修改 master 主机的计算机名设置host文件

bash 复制代码

[root@centos01 ~]# hostname k8s-master
[root@centos01 ~]# bash
[root@k8s-master ~]# vim /etc/hosts

bash 复制代码

[root@k8s-master ~]# scp /etc/hosts k8s-node01:/etc/hosts
[root@k8s-master ~]# scp /etc/hosts k8s-node02:/etc/hosts

bash 复制代码

[root@centos02 ~]# hostname  k8s-node01
[root@centos02 ~]# bash

bash 复制代码

[root@centos03 ~]# hostname  k8s-node02
[root@centos03 ~]# bash

二、安装部署

（一）安装 master 节点

1）安装 etcd 配置etcd

[root@k8s-master ~]# yum -y install etcd

[root@k8s-master ~]# cp /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak

bash 复制代码

[root@k8s-master ~]# vim /etc/etcd/etcd.conf
6 ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
21 ETCD_ADVERTISE_CLIENT_URLS=http://192.168.100.131:2379

bash 复制代码

[root@k8s-master ~]# systemctl start etcd
[root@k8s-master ~]# systemctl enable etcd

2）安装k8s-master节点

[root@k8s-master ~]#yum -y install kubernetes-master.x86_64

3）配置apiserver

[root@k8s-master ~]# ls /etc/kubernetes/

bash 复制代码

[root@k8s-master ~]# vim /etc/kubernetes/apiserver
配置如下：
8 KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"  //修改监听IP地址
12 KUBE_API_PORT="--port=8080"       //监听端口
16 KUBELET_PORT="--kubelet-port=10250"     //kubelet监听端口
19 KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.100.131:2379" //连接etcd
24 KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

4）配置 controller 和scheduler

[root@k8s-master ~] # vim /etc/kubernetes/config

配置如下：

22 KUBE_MASTER="--master=http://192.168.100.131:8080"

5）启动k8s服务

bash 复制代码

[root@k8s-master ~]# systemctl start kube-apiserver.service kube-controller-manager.service  kube-scheduler.service
[root@k8s-master ~]# systemctl enable kube-apiserver.service kube-controller-manager.service kube-scheduler.service

6）检查节点安装都是健康的

[root@k8s-master ~]# kubectl get componentstatus

（二）安装k8s-master上的node

1）安装node

[root@k8s-master ~]# yum -y install kubernetes node.x86_64

docker版本冲突

错误：docker-ce-cli conflicts with 2:docker-1.13.1-102.git7f2769b.el7.centos.x86_64

问题：造成该错误的主要原因是由于安装k8s过程中会自动依赖安装docker，但是由于本地已经安装了其他版本的docker，造成依赖关系检查不通过

解决方案：

卸载本地已安装docker

yum list installed | grep docker

bash 复制代码

yum -y remove docker-buildx-plugin.x86_64 docker-ce-cli.x86_64 docker-compose-plugin.x86_64

yum -y install kubernetes-node.x86_64

docker version

2）配置kubelet

bash 复制代码

[root@k8s-master ~]# vim /etc/kubernetes/kubelet
配置如下：
5 KUBELET_ADDRESS="--address=192.168.100.131"      //监听IP地址
11 KUBELET_HOSTNAME="--hostname-override=k8s-master"    //监听计算机名
14 KUBELET_API_SERVER="--api-servers=http://192.168.100.131:8080"  //监听apiserver端口

3）启动kubelet启动自动启动docker服务

[root@k8s-master ~]# systemctl start kubelet

[root@k8s-master ~]# systemctl enable kubelet

4）启动kubelet-proxy

[root@k8s-master ~]# systemctl start kube-proxy

[root@k8s-master ~]# systemctl enable kube-proxy

5）检查node节点

[root@k8s-master ~]# kubectl get nodes

（三）安装配置k8s-node1节点

1）安装node

[root@k8s-node1 ~]# yum install kubernetes-node.x86_64

2）node1连接k8s-master

[root@k8s-node01 ~]# ls /etc/kubernetes/

bash 复制代码

[root@k8s-node1 ~]# vim /etc/kubernetes/config
22 KUBE_MASTER="--master=http://192.168.100.131:8080"

3）配置kubelet

bash 复制代码

[root@k8s-node1 ~]# vim /etc/kubernetes/kubelet
5 KUBELET_ADDRESS="--address=192.168.100.132"
11 KUBELET_HOSTNAME="--hostname-override=k8s-node1"
15 KUBELET_API_SERVER="--api-servers=http://192.168.100.131:8080"

4）启动服务

[root@k8s-node1 ~]# systemctl start kubelet

[root@k8s-node1 ~]# systemctl start kube-proxy

[root@k8s-node1 ~]# systemctl enable kubelet

[root@k8s-node1 ~]# systemctl enable kube-proxy

5）在 master 节点检测node节点状态

[root@k8s-master ~]# kubectl get nodes

（四）安装k8s-node2节点

1）安装node

[root@k8s-node2 ~]# yum install kubernetes-node.x86_64

2）node2连接k8s-master

[root@k8s-node2 ~]# vim /etc/kubernetes/config

配置如下：

22 KUBE_MASTER="--master=http://192.168.100.131:8080"

3）配置kubelet

[root@k8s-node2 ~]# vim /etc/kubernetes/kubelet

5 KUBELET_ADDRESS="--address=192.168.100.133"

11 KUBELET_HOSTNAME="--hostname-override=k8s-node2"

15 KUBELET_API_SERVER="--api-servers=http://192.168.100.131:8080"

4）启动服务

[root@k8s-node2 ~]# systemctl start kubelet

[root@k8s-node2 ~]# systemctl start kube-proxy

[root@k8s-node2 ~]# systemctl enable kubelet

[root@k8s-node2 ~]# systemctl enable kube-proxy

5）在 master 节点检测node节点状态

[root@k8s-master ~]# kubectl get nodes

（五）为所有node节点配置flannel网络

1）在k8s-master节点安装flannel

[root@k8s-master ~]# yum install flannel -y

[root@k8s-master ~]# ls /etc/sysconfig/

bash 复制代码

[root@k8s-master ~]# vim /etc/sysconfig/flanneld
4 FLANNEL_ETCD_ENDPOINTS=http://192.168.100.131:2379

bash 复制代码

[root@k8s-master ~]# etcdctl set /atomic.io/network/config '{ "Network": "172.16.0.0/16" }' //配置网络

bash 复制代码

[root@k8s-master ~]# systemctl start flanneld
[root@k8s-master ~]# systemctl enable flanneld

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[root@k8s-master ~]# ifconfig  //查看多一个网络

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[root@k8s-master ~]# systemctl restart docker  //重新启动docker服务和flannel网络保持一致
[root@k8s-master ~]# systemctl enable docker
[root@k8s-master ~]# ifconfig
Ps备注：自动安装了docker容器，在这版本下，k8s和docker还是融合在一起使用的

2）配置node1节点flannel网络

[root@k8s-node1 ~]# yum install flannel -y

[root@k8s-node01 ~]# ls /etc/sysconfig/

bash 复制代码

[root@k8s-node1 ~]# vim /etc/sysconfig/flanneld
配置如下：
4 FLANNEL_ETCD_ENDPOINTS=http://192.168.100.131:2379

bash 复制代码

[root@k8s-node1 ~]# systemctl start flanneld
[root@k8s-node1 ~]# systemctl enable flanneld
[root@k8s-node1 ~]# systemctl restart docker
[root@k8s-node1 ~]# systemctl enable docker
[root@k8s-node01 ~]# ifconfig

3）安装node2节点flannel网络

[root@k8s-node2 ~]# yum install flannel -y

[root@k8s-node02 ~]# ls /etc/sysconfig/

bash 复制代码

[root@k8s-node2 ~]# vim /etc/sysconfig/flanneld
配置如下：
4 FLANNEL_ETCD_ENDPOINTS=http://192.168.100.131:2379

bash 复制代码

[root@k8s-node2 ~]# systemctl start flanneld
[root@k8s-node2 ~]# systemctl enable flanneld
[root@k8s-node2 ~]# systemctl restart docker
[root@k8s-node2 ~]# systemctl enable docker
[root@k8s-node02 ~]# ifconfig

4）测试docker容器跨 宿主机 通信

bash 复制代码

[root@k8s-node1 ~]# iptables -P FORWARD ACCEPT  
//允许转发数据
[root@k8s-node2 ~]# iptables -P FORWARD ACCEPT
[root@k8s-master ~]# iptables -P FORWARD ACCEPT
[root@k8s-master ~]# docker pull busybox 
//下载镜像，而后进入docker run -it busybox

[root@k8s-noded01 ~]# docker run -it busybox

[root@k8s-noded02 ~]# docker run -it busybox

/ # ping 172.16.31.2 //测试和其他docker宿主机之间通信