openstack虚拟机（centos7）简单优化

基本优化

#临时关闭selinux
setenforce 0 
#关闭防火墙                 
systemctl stop firewalld
#关闭开机自启
systemctl disable firewalld
#关闭邮件服务     
systemctl stop postfix.service
#关闭开机自启
systemctl disable postfix.service 
#关闭centos8的网卡服务
systemctl stop NetworkManager
#关闭开启自启
systemctl disable NetworkManager 
=======================================================
setenforce 0
systemctl stop firewalld
systemctl disable firewalld
systemctl stop postfix.service
systemctl disable postfix.service
systemctl stop NetworkManager
systemctl disable NetworkManager

源优化

#bese源
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
#epel源
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
#更换完别忘记加载一下
yum clean all
yum makecache 
=======================================================
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
yum clean all
yum makecache 

运维常用软件下载

yum install -y tree vim net-tools lrzsz wget telnet bash-completion unzip

远程连接优化

#提高远程连接效率
sed  -i  '79s#yes#no#g'  /etc/ssh/sshd_config
sed  -i  's@#UseDNS yes@UseDNS no@g'  /etc/ssh/sshd_config

时间同步优化

#修改系统时区
timedatectl set-timezone Asia/Shanghai
#开启网络时间同步功能
timedatectl set-ntp 1
#安装时间同步程序
yum install -y chrony
systemctl start chronyd
systemctl enable chronyd
=======================================================
timedatectl set-timezone Asia/Shanghai
timedatectl set-ntp 1
yum install -y chrony
systemctl start chronyd
systemctl enable chronyd

颜色提示符优化

#可以让主机名颜色变的醒目
vi /etc/profile
User_color='\[\e[34;1m\]'
Hostname_color='\[\e[32;1m\]'
Path_color='\[\e[31;1m\]'
End_color='\[\e[0m\]'
PS1="[${User_color}\u${End_color}@${Hostname_color}\h${End_color}${Path_color}\W${End_color}]\\$ "
#wq!保存
#加载环境变量
source /etc/profile
=======================================================
30： 灰色
31： 红色
32： 绿色
33： 黄色
34： 蓝色
35： 粉色
36： 浅蓝色
37： 白色
#可以通过修改上方变量中的数字来修改颜色