centos7 系统初始化配置

1、设置ip地址

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens192
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="ens192"
DEVICE="ens192"
ONBOOT="yes"
IPADDR="192.168.82.232"
PREFIX="24"
GATEWAY="192.168.82.1"
DNS1="114.114.114.114"
[root@localhost ~]#

2、修改主机名

hostnamectl set-hostname postmail

3、更改yum源、update

#备份现有源配置
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

#rpm安装wget
rpm -ivh http://mirrors.163.com/centos/7/os/x86_64/Packages/wget-1.14-18.el7_6.1.x86_64.rpm

#下载并替代本地源
yum install -y wget
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-7.repo

#修改Centos-7.repo文件将所有$releasever替换为7 
yum install -y vim
vim /etc/yum.repos.d/CentOS-Base.repo
#输入替换命令 
%s/$releasever/7/g

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache

#添加epel源
yum install -y epel-release

#update
yum -y update

　　

4、关闭防火墙

#查看防火墙状态
systemctl status firewalld
#关闭防火墙
systemctl stop firewalld
#关闭开机启动防火墙
systemctl disable firewalld

　　

5、关闭selinux

#查看selinux状态
getenforce

#临时关闭
setenforce 0

#永久关闭
#SELINUX=enforcing 改为 SELINUX=disabled
vim /etc/sysconfig/selinux

　　

6、调整系统时区

timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 0
systemctl restart rsyslog
systemctl restart crond

7、关闭系统不需要的服务

ss -tnl
systemctl stop postfix && systemctl disable postfix

8、安装net-tools

yum install -y net-tools