1.查看linux内核版本

# uname -srm

输出： Linux 3.10.0-1160.e17.x86_64 x86_64

# cat /etc/redhat-release

CentOS Linux release 7.9.2009(Core)

2.修改机器名

vi /etc/hostname

修改完成后重启 

reboot

3.修改IP地址

 查看ip

ip a

修改ip：

vi /etc/sysconfig/network-scripts/ifcfg-ens33

VMware查看网关

修改完成后

service network restart

service network start/stop/restart

systemctl restart/stop/start/status network

4.关闭防火墙

关闭

systemctl start/stop/disable firewalld

5.关闭Linux SELinux 

1.临时关闭

setenforce 0

2.永久关闭

vi /etc/selinux/config

6.修改yum源

如果机器没有wget需要下载repo文件并上传

首先下载http://mirrors.163.com/.help/CentOS7-Base-163.repo

备份原有的文件

cd /etc/yum.repos.d

mv CentOS-Base.repo CentOS-Base.repo.back

[base]name=CentOS-$releasever - Base - 163.com baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#released updates[updates]name=CentOS-$releasever - Updates - 163.com#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updatesbaseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additional packages that may be useful[extras]name=CentOS-$releasever - Extras - 163.com#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extrasbaseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever - Plus - 163.combaseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

yum makecache

yum install ***

7.免密登录

/usr/bin/ssh-kengen -t rsa

下发到其他机器

/usr/bin/ssh-copy-id -i ./id_rsa.pub 192.168.218.102

登录102机器

ssh 192.168.218.102

8.查看端口占用

natstat -nat|grep -E "8030|9090|8080"

9.修改Linux句柄数

vi /etc/security/limits.conf

添加到文件最后

* soft nofile 65535

* hard nofile 65535

* soft nproc 65535

* hard nproc 65535

临时生效

ulimit -n 65535

永久生效需要重启

10.关闭交换分区

查看交换分区

free -m

关闭

swapoff -a