CentOS 7 vs CentOS 6的不同

(1)桌面系統

[CentOS6] GNOME 2.x
[CentOS7] GNOME 3.x（GNOME Shell）

(2)檔案系統

[CentOS6] ext4
[CentOS7] xfs

(3)核心版本

[CentOS6] 2.6.x-x
[CentOS7] 3.10.x-x

(4)啟動載入器

[CentOS6] GRUB Legacy (+efibootmgr)
[CentOS7] GRUB2

(5)防火牆

[CentOS6] iptables
[CentOS7] firewalld
 

(6)預設資料庫

[CentOS6] MySQL
[CentOS7] MariaDB

(7)檔案結構

[CentOS6] /bin, /sbin, /lib, and /lib64在/下
[CentOS7] /bin, /sbin, /lib, and /lib64移到/usr下

(8)主機名

[CentOS6] /etc/sysconfig/network
[CentOS7] /etc/hostname

(9)時間同步

[CentOS6]

$ ntp
$ ntpq -p

[CentOS7]

$ chrony
$ chronyc sources

(10)修改時間

[CentOS6]

$ vim /etc/sysconfig/clock
   ZONE="Asia/Tokyo"
   UTC=fales
$ sudo ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime

[CentOS7]

$ timedatectl set-timezone Asia/Tokyo
$ timedatectl status

(11)修改地區

[CentOS6]

$ vim /etc/sysconfig/i18n
   LANG="ja_JP.utf8"
$ /etc/sysconfig/i18n
$ locale

[CentOS7]

$ localectl set-locale LANG=ja_JP.utf8
$ localectl status
 

(12)服務相關

12.1、啟動停止

[CentOS6]

$ service service_name start
$ service service_name stop
$ service sshd restart/status/reload

[CentOS7]

$ systemctl start service_name
$ systemctl stop service_name
$ systemctl restart/status/reload sshd

12.2、自啟動

[CentOS6]

$ chkconfig service_name on/off

[CentOS7]

$ systemctl enable service_name
$ systemctl disable service_name

12.3、服務一覽

[CentOS6]

$ chkconfig --list

[CentOS7]

$ systemctl list-unit-files
$ systemctl --type service

12.4、強制停止

[CentOS6] $ kill -9 <PID>
[CentOS7] $ systemctl kill --signal=9 sshd

(13)網路

13.1、網路資訊

[CentOS6]

$ netstat
$ netstat -I
$ netstat -n

[CentOS7]

$ ip n
$ ip -s l
$ ss

13.2、IP地址MAC地址

[CentOS6] $ ifconfig -a
[CentOS7] $ ip address show

13.3、路由

[CentOS6]

$ route -n
$ route -A inet6 -n

[CentOS7]

$ ip route show
$ ip -6 route show

(14)重啟關閉

14.1、關閉

[CentOS6]

$ shutdown -h now 

[CentOS7]

$ poweroff
$ systemctl poweroff

14.2、重啟

[CentOS6]

$ reboot
$ shutdown -r now

[CentOS7]

$ reboot
$ systemctl reboot

14.3、單使用者模式

[CentOS6] $ init S
[CentOS7] $ systemctl rescue

14.4、啟動模式

[CentOS6]

[GUICUI]

$ vim /etc/inittab
id:3:initdefault:

[CUIGUI]
$ startx

[CentOS7]

[GUICUI]

$ systemctl isolate multi-user.target

[CUIGUI]

$systemctl isolate graphical.target

預設 啟動介面

$ systemctl set-default graphical.target
$ systemctl set-default multi-user.target

當前 啟動介面

$ systemctl get-default

參考：
http://urashita.com/archives/1538
http://qiita.com/sion_cojp/items/115e1671fcbc8f214aee
https://www.upken.jp/kb/cent6-cent7.html
http://inaba-serverdesign.jp/blog/20141110/centos7.html