八.精简系统服务和开机进程

线上服务器建议开启的服务

crond / network / syslog / sshd / iptables / udev-post / sysstat

快捷开启方式，先关闭所有服务

for serv in `chkconfig --list|grep 3:on|awk '{print $1}'`;do chkconfig --level 3 $serv off;done

for serv in `crond network syslog sshd iptables udev-post sysstat`;do chkconfig --level 3 $serv on;done

可删除的系统用户和组

查看用户组

vipw

删除不必要的用户

userdel adm
userdel lp
userdel sync
userdel shutdown
userdel halt
userdel news
userdel uucp
userdel video
userdel games
userdel gopher
userdel ftp

删除不必要的群组

groupdel adm
groupdel lp
groupdel news
groupdel uucp
groupdel games
groupdel dip