Yum，防火墙，SElinux简单设置

1、当centos最小化安装时，需要自己安装所需要的安装包、需要配置yum源；

1、挂载光盘；
# mount  /dev/sr0  /mnt
# df ----查看光盘是否挂载；
2、创建yum源；
#cd /etc/yum.repos.d/
#rm -rf * ----删除当前目录下的原有的文件，自己重新创建并编写配置文件；
#vim  /etc/yum.repo.d/base.repo
[base]
name=base
baseurl=file:///mnt
gpgcheck=0----不用输入公钥
#yum repolist
#yum makecache----创建元数据缓存；
3、安装autofs包，以后启动光盘将自动挂载到/misc/cd 目录下；
centos7
#yum install autofs 
#systemctl enable autofs----下次开机启动；
#systemctl is-enabled autofs----查看是否生效；
#systemctl start autofs----启动服务；
#cd /misc/cd----查看是否能进入神奇的目录；
centos6
#yum install autofs
#chkconfig autofs on----下次开机启动；
#chkconfig --list----查看是否生效；
#service  autofs  start----开启服务；
#service  autofs status----查看是否生效；
4、将yum源重新配置，更改为/misc/cd目录下；
#cat>/etc/yum.repos.d/ <

2、运行一些服务时需要关闭防火墙，防火墙设置；

1、查看防火墙状态；
centos7
#iptables -nvL----查看防火墙状态；
#systemctl disable firewalld----下次开机关闭防火墙；
#systemctl is-enabled firewalld----查看是否生效；
#systemctl stop firewalld----停止防火墙服务；
#systemctl status firewalld----查看防火墙状态；
centos6
#iptables -nvL----查看防火墙状态；
#chkconfig iptables off----下次开机关闭防火墙；
#chkconfig --list----查看防火墙状态；
#service iptables stop----停止防火墙服务；
#service iptables status----查看防火墙状态；

3、运行一些服务时需更改SElinux配置文件；

1、查看SElinux当前状态；
#getenforce----查看当前状态；
[root@centos6 ~]# cat /etc/selinux/config
# 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=enforcing
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted 
2、将SELINUX=enforcing更改为SELINUX=permissive;
#vim /etc/selinux/config
# 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=permissive
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted
3、# setenforce 0
4、查看当前状态；
# getenforce

#systemctl (enable ,disable)  option
#systemctl is-enabled   option
#chkconfig option (on，off)
#chkconfig  --list

#systemctl (start ,status,restart,stop ) option
#service option  (start,status,restart,stop)