The difference between CentOS 7 vs CentOS 6
(1) Desktop system
[ CentOS6] GNOME 2.x
[ CentOS7] GNOME 3.x（GNOME Shell）
(2) File system
[ CentOS6] ext4
[ CentOS7] xfs
(3) Kernel version
[ CentOS6] 2.6.x-x
[ CentOS7] 3.10.x-x
(4) Boot loader
[ CentOS6] GRUB Legacy (+efibootmgr)
[ CentOS7] GRUB2
(5) Firewall
[ CentOS6] iptables
[ CentOS7] firewalld
(6) Default database
[ CentOS6] MySQL
[ CentOS7] MariaDB
(7) File structure
[ CentOS6] /bin, /sbin, /lib, and /lib64 under /
[ CentOS7] /bin, /sbin, /lib, and /lib64 moved to /usr
(8) CPU name
[ CentOS6] /etc/sysconfig/network
[ CentOS7] /etc/hostname
(9) Time synchronization
[ CentOS6]
$ ntp
$ ntpq -p
[ CentOS7]
$ chrony
$ chronyc sources
(10) Change the time
[ 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) Edit region
[ CentOS6]
$ vim /etc/sysconfig/i18n
LANG="ja_JP.utf8"
$ /etc/sysconfig/i18n
$ locale
[ CentOS7]
$ localectl set-locale LANG=ja_JP.utf8
$ localectl status
(12) Service related
1 )start stop
[ 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
Self-starting
[ CentOS6]
$ chkconfig service_name on/off
[ CentOS7]
$ systemctl enable service_name
$ systemctl disable service_name
Service overview
[ CentOS6]
$ chkconfig --list
[ CentOS7]
$ systemctl list-unit-files
$ systemctl --type service
Forced stop
[ CentOS6]
$ kill -9
[ CentOS7]
$ systemctl kill --signal=9 sshd
(13) The internet
1 )Internet Information
[ CentOS6]
$ netstat
$ netstat -I
$ netstat -n
[ CentOS7]
$ ip n
$ ip -s l
$ ss
2 ) IP address MAC address
[ CentOS6]
$ ifconfig -a
[ CentOS7]
$ ip address show
3 )routing
[ CentOS6]
$ route -n
$ route -A inet6 -n
[ CentOS7]
$ ip route show
$ ip -6 route show
(14) Restart shutdown
1 )shut down
[ CentOS6]
$ shutdown -h now
[ CentOS7]
$ poweroff
$ systemctl poweroff
2 ) Restart
[ CentOS6]
$ reboot
$ shutdown -r now
[ CentOS7]
$ reboot
$ systemctl reboot
3 ) Single user mode
[ CentOS6]
$ init S
[ CentOS7]
$ systemctl rescue
4 ) Startup mode
[ CentOS6]
[ GUICUI]
$ vim /etc/inittab
id:3:initdefault:
[ CUIGUI]
$ startx
[ CentOS7]
[ GUICUI]
$ systemctl isolate multi-user.target
[ CUIGUI]
$systemctl isolate graphical.target
default
$ systemctl set-default graphical.target
$ systemctl set-default multi-user.target
current
$ systemctl get-default
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