What are the similarities and differences between CentOS7 and CentOS6?

Differences 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)Start 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 are under /

[CentOS7] /bin, /sbin, /lib, and /lib64 moved to /usr

(8)Host name

[CentOS6] /etc/sysconfig/network

[CentOS7] /etc/hostname

(9)Time synchronization

[CentOS6]

$ ntp

$ ntpq -p

[CentOS7]

$ chrony

$ chronyc sources

(10)Modification 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)Modify 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 and 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

Auto-Start

[CentOS6]

$ chkconfig service_name on/off

[CentOS7]

$ systemctl enable service_name

$ systemctl disable service_name

Service List

[CentOS6]

$ chkconfig --list

[CentOS7]

$ systemctl list-unit-files

$ systemctl --type service

Forced Stop

[CentOS6]

$ kill -9

[CentOS7]

$ systemctl kill --signal=9 sshd

(13)Network

1) Network 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 and shut down

1) Close

[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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