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实验环境配置
一 默认环境
1.1 操作系统
代码语言：javascript复制[root@gysl-DevOps ~]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)2.1 Swap 设置
代码语言：javascript复制[root@gysl-DevOps ~]# free -h
total used free shared buff/cache available
Mem: 972M 182M 175M 7.6M 615M 571M
Swap: 0B 0B 0B为了后期 Kubernetes 实验，在安装系统的时候关闭了 Swap 。
二 更改默认配置
安装Docker Engine,修改相关内核参数，关闭防火墙，禁用SELinux，安装EPEL，重启机器。脚本如下：
代码语言：javascript复制#!/bin/bash
UserName='gysl'
PassWord='drh123'
# Install the Docker engine. This needs to be executed on every machine.
curl http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo>&/dev/null
if [ $? -eq 0 ] ;
then
yum remove docker
docker-client
docker-client-latest
docker-common
docker-latest
docker-latest-logrotate
docker-logrotate
docker-selinux
docker-engine-selinux
docker-engine>&/dev/null
yum list docker-ce --showduplicates|grep "^doc"|sort -r
yum -y install docker-ce-18.09.3-3.el7
rm -f /etc/yum.repos.d/docker-ce.repo
systemctl enable docker --now && systemctl status docker
else
echo "Install failed! Please try again! ";
exit 110
fi
# Modify related kernel parameters.
cat>/etc/sysctl.d/kubernetes.conf<<EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p /etc/sysctl.d/kubernetes.conf>&/dev/null
# Turn off and disable the firewalld.
systemctl stop firewalld
systemctl disable firewalld
# Disable the SELinux.
sed -i.bak 's/=enforcing/=disabled/' /etc/selinux/config
# Disable the swap.
sed -i.bak 's/^.*swap/#&/g' /etc/fstab
# Install EPEL/vim/git.
yum -y install epel-release vim git
yum repolist
# Add a docker user.
useradd $UserName
echo $PassWord|passwd $UserName --stdin
usermod $UserName -aG docker
# Reboot the machine.
reboot
