关闭防火墙

centos6

永久性生效：chkconfig iptables off 

即时生效：service iptables stop

查看防火墙状态：service iptables status  或者 iptables -L

检查防火墙是否开机自启：chkconfig iptables  --list 

 

centos7

临时关闭：systemctl stop firewalld

防火墙开机关闭：systemctl disable firewalld

开机启动：systemctl enable firewalld

查看状态：systemctl status firewalld

获取 firewalld 状态：firewall-cmd --state

 

 

关闭SELinux

centos6跟centos7通用

永久有效：修改/etc/sysconfig/selinux

vi /etc/sysconfig/selinux

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

##将文本中的SELINUX=enforcing，改为SELINUX=disabled。然后重启

即时有效：setenforce  0      

查看状态：getenforce

 

 

链接网卡文件

centos6

ln -s /etc/sysconfig/network-scripts/ifcfg-eth0 /root/

 

centos7

ln -s /etc/sysconfig/network-scripts/ifcfg-ens33 /root/

 

 

安装常用服务

yum -y install epel-release vim wget unzip gzip lrzsz git net-tools && yum -y install htop

 

 

修改yum源

cd /etc/yum.repos.d/
##进入系统中存储yum源的目录

mv CentOS-Base.repo CentOS-Base.repo.J
##备份系统自带的yum源
 
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
##下载网易yum源
 
mv CentOS7-Base-163.repo CentOS-Base.repo
##将下载的yum源文件改成系统自带yum源文件的名字
 
yum makecache
##创建元数据缓存
   
yum -y update
##更新系统yum源安装包 

详细：http://www.linux91.cn/c/Linux__centos7__yum%E7%BD%91%E7%BB%9C%E6%BA%90