curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

bash-completion  补全命令包

关闭防火墙

[root@CentOS7 ~]# systemctl disable firewalld.service 

[root@CentOS7 ~]# systemctl stop firewalld.service 

关闭seliux

[root@Centos7 ~]# sed -i 's#enforcing#disabled#g'  /etc/selinux/config

vim  /etc/ssh/sshd_config

         Port 52113                                  #使用大于10000的端口号

         PermitRootLogin no                          #禁止root远程登录

         PermitEmptyPasswords no                     #禁止空密码登录

         UseDNS no                                   #不使用dns解析

         GSSAPIAuthentication no                     #连接慢的解决配置

重启生效systemctl restart sshd

useradd oldboy

passwd oldboy

visudo

93 oldboy ALL=(ALL)     NOPASSWD: ALL

echo '*/5 * * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1' >> /var/spool/cron/root

hostnamectl set-hostname  主机名

cat /etc/hostname 

查看     hostnamectl

Bash   生效

[root@clsn ~]# echo $LANG

zh_CN.UTF-

[root@clsn ~]# cat /etc/locale.conf

LANG="zh_CN.UTF-8"

[root@oldboyedu39 ~]# export LANG=en_US.UTF-8 ####修改

[root@oldboyedu39 ~]#  echo $LANG  ###查看

en_US.UTF-8

[root@oldboyedu39 ~]#

[root@kickstart ~]# systemctl list-unit-files|egrep "^ab|^aud|^kdump|vm|^md|^mic|^post|lvm"  |awk '{print $1}'|sed -r 's#(.*)#systemctl disable &#g'|bash