centos7与centos6区别
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
[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
