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Kubernetes集群环境准备.md

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一、k8s集群实验环境准备

架构图

主机名 IP地址（NAT） 描述
linux-node1.example.com eth0:192.168.56.11 Kubernets Master节点/Etcd节点
linux-node2.example.com eth0:192.168.56.12 Kubernets Node节点/ Etcd节点
linux-node3.example.com eth0:192.168.56.13 Kubernets Node节点/ Etcd节点

二、准备工作

1、设置主机名

hostnamectl set-hostname linux-node1
hostnamectl set-hostname linux-node2
hostnamectl set-hostname linux-node3

2、绑定主机host

cat > /etc/hosts <<EOF
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.56.11 linux-node1 linux-node1.example.com
192.168.56.12 linux-node2 linux-node2.example.com
192.168.56.13 linux-node3 linux-node3.example.com
EOF

3、设置部署节点(Master)到其它所有节点的SSH免密码登(包括本机)

[root@linux-node1 ~]# ssh-keygen -t rsa
[root@linux-node1 ~]# ssh-copy-id linux-node1
[root@linux-node1 ~]# ssh-copy-id linux-node2
[root@linux-node1 ~]# ssh-copy-id linux-node3

4、关闭防火墙和selinux

#关闭防火墙
systemctl disable firewalld
systemctl stop firewalld

#关闭selinux
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux
sed -i "s/SELINUXTYPE=targeted/SELINUXTYPE=disabled/g" /etc/sysconfig/selinux
setenforce 0

5、其他配置

yum install -y ntpdate wget lrzsz vim net-tools

#加入crontab
1 * * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1

#设置时区
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

#SSH登录慢
sed -i "s/#UseDNS yes/UseDNS no/"  /etc/ssh/sshd_config
sed -i "s/GSSAPIAuthentication yes/GSSAPIAuthentication no/"  /etc/ssh/sshd_config
systemctl restart sshd.service

6、软件包下载

k8s-v1.12.0版本网盘地址: https://pan.baidu.com/s/1jU427W1f3oSDnzB3bU2s5w

#所有文件存放在/opt/kubernetes目录下
mkdir -p /opt/kubernetes/{cfg,bin,ssl,log}

#使用二进制方式进行部署
官网下载地址: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md#downloads-for-v1121

#添加环境变量
vim /root/.bash_profile
PATH=$PATH:$HOME/bin:/opt/kubernetes/bin
source /root/.bash_profile

官网下载链接

7、解压软件包

tar -zxvf kubernetes.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-server-linux-amd64.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-client-linux-amd64.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-node-linux-amd64.tar.gz -C /usr/local/src/