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)啟動加載器
[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
$ vim /etc/sysconfig/clock
ZONE="Asia/Tokyo"
UTC=fales
$ sudo ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
$ timedatectl set-timezone Asia/Tokyo
$ timedatectl status
(11)修改地區
$ vim /etc/sysconfig/i18n
LANG="ja_JP.utf8"
$ /etc/sysconfig/i18n
$ locale
$ localectl set-locale LANG=ja_JP.utf8
$ localectl status
(12)服務相關
1）啟動停止
$ service service_name start
$ service service_name stop
$ service sshd restart/status/reload
$ systemctl start service_name
$ systemctl stop service_name
$ systemctl restart/status/reload sshd
自啟動
$ chkconfig service_name on/off
$ systemctl enable service_name
$ systemctl disable service_name
服務一覽
$ chkconfig --list
$ systemctl list-unit-files
$ systemctl --type service
強制停止
$ kill -9 <PID>
$ systemctl kill --signal=9 sshd
(13)網絡
1）網絡資訊
$ netstat
$ netstat -I
$ netstat -n
$ ip n
$ ip -s l
$ ss
2）IP位址MAC位址
$ ifconfig -a
$ ip address show
3）路由
$ route -n
$ route -A inet6 -n
$ ip route show
$ ip -6 route show
(14)重新開機關閉
1）關閉
$ shutdown -h now
$ poweroff
$ systemctl poweroff
2）重新開機
$ reboot
$ shutdown -r now
$ systemctl reboot
3）單使用者模式
$ init S
$ systemctl rescue