CentOS7和CentOS6有何异同之处？

centos 7 vs centos 6的不同

 (1)桌面系统

[CentOS6] GNOME 2.x

[CentOS7] GNOME 3.x（GNOME Shell）

(2)文件系统

[CentOS6] ext4

[CentOS7] xfs

(3)内核版本

[CentOS6] 2.6.x-x

[CentOS7] 3.10.x-x

(4)启动加载器

[CentOS6] GRUB Legacy (+efibootmgr)

[CentOS7] GRUB2

(5)防火墙

[CentOS6] iptables

[CentOS7] firewalld

(6)默认数据库

[CentOS6] MySQL

[CentOS7] MariaDB

(7)文件结构

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

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

(8)主机名

[CentOS6] /etc/sysconfig/network

[CentOS7] /etc/hostname

(9)时间同步

[CentOS6]

$ ntp

$ ntpq -p

[CentOS7]

$ chrony

$ chronyc sources

(10)修改时间

[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)修改地区

[CentOS6]

$ vim /etc/sysconfig/i18n

   LANG="ja_JP.utf8"

$ /etc/sysconfig/i18n

$ locale

[CentOS7]

$ localectl set-locale LANG=ja_JP.utf8

$ localectl status

(12)服务相关

1）启动停止

[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

自启动

[CentOS6]

$ chkconfig service_name on/off

[CentOS7]

$ systemctl enable service_name

$ systemctl disable service_name

服务一览

[CentOS6]

$ chkconfig --list

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[CentOS7]

$ systemctl list-unit-files

$ systemctl --type service

强制停止

[CentOS6]

$ kill -9

[CentOS7]

$ systemctl kill --signal=9 sshd

(13)网络

1）网络信息

[CentOS6]

$ netstat

$ netstat -I

$ netstat -n

[CentOS7]

$ ip n

$ ip -s l

$ ss

2）IP地址MAC地址

[CentOS6]

$ ifconfig -a

[CentOS7]

$ ip address show

3）路由

[CentOS6]

$ route -n

$ route -A inet6 -n

[CentOS7]

$ ip route show

$ ip -6 route show

(14)重启关闭

1）关闭

[CentOS6]

$ shutdown -h now 

[CentOS7]

$ poweroff

$ systemctl poweroff

2）重启

[CentOS6]

$ reboot

$ shutdown -r now

[CentOS7]

$ reboot

$ systemctl reboot

3）单用户模式

[CentOS6]

$ init S

[CentOS7]

$ systemctl rescue

4）启动模式

[CentOS6]

[GUICUI]

$ vim /etc/inittab

  id:3:initdefault:

[CUIGUI]

$ startx

[CentOS7]

[GUICUI]

$ systemctl isolate multi-user.target

[CUIGUI]

$systemctl isolate graphical.target

默认

$ systemctl set-default graphical.target

$ systemctl set-default multi-user.target

当前

$ systemctl get-default