What is the difference between the commands of centos7 and 6?

Difference: 1. Centos7 uses systemd instead of init; 2. Modify the host name. Centos6 needs to modify "/etc/sysconfig/network", while 7 needs to modify "/etc/hostname"; 3. Centos7 uses the chrony command To synchronize time, use ntp.

#The operating environment of this tutorial: centos7 system, thinkpad t480 computer.

I have recently been using CentOS 7 and found that many commands are different from CentOS 6, so they are listed here for reference.

1. Commonly used systemctl commands

CentOS 7 began to use systemd to replace the init system parent process, so it is necessary to be proficient in systemctl.

##systemctl enable sshd.servicechkconfig --level 3 sshd onStart the ssh service automatically after booting systemctl disable sshd.servicechkconfig --level 3 sshd offDisable starting the ssh service at bootsystemctl list-unit-files --type=servicechkconfig --listList all service statussystemctl list -unitschkconfig --list,ntsysvList allowed service unitssystemctl is-active sshd.servicechkconfig --list sshdCheck whether the ssh service is runningsystemctl mask sshd.serviceShield (cannot Enable) ssh servicesystemctl unmask sshd.serviceliberation shield ssh servicesystemctl show sshd.serviceShow configuration information of SSH servicesystemctl get-default Get the currently used runlevelsystemctl set-default runlevel3.targetvi /etc/inittabModify the default runlevelsystemctl isolate runlevel3.targetinit 3Enable runlevel 3

CentOS 7	CentOS 6	Function
systemctl start sshd.service	service sshd start	Start ssh service
systemctl stop sshd.service	service sshd stop	Stop ssh service
systemctl restart sshd.service	service sshd restart	restart ssh service
systemctl status sshd.service	service sshd status	View ssh service status
systemctl reload sshd.service	service sshd reload	Reload the ssh service

2. Configuration file

1. Startup configuration

centos6: Modify /etc/inittab

centos7: systemctl set-default runlevel3.target

2. Modify the host name

centos6: Modify /etc/sysconfig/network

centos7: Modify /etc/hostname

3. Open the startup file /etc/rc. d/rc.local

centos6: No modification required

centos7: chmod x /etc/rc.d/rc.local

4. Default firewall

centos6: iptables

centos7: firewall

5. Start the service in file mode

centos6:/etc/rc.d/rc3.d/ Modify the ones starting with K The file is S

centos7: Make a soft connection to a service under /usr/lib/systemd/system/ to the /etc/systemd/system directory

6, routing forwarding

centos6: Edit /etc/sysctl.conf and add net.ipv4.ip_forward = 1 or echo “1” > /proc/sys/net/ipv4/ip_forward

centos7: Edit /etc/sysctl .conf Add net.ipv4.ip_forward = 1 or echo “1” > /proc/sys/net/ipv4/ip_forward

Edit /usr/lib/sysctl.d/50-default.conf Add net .ipv4.ip_forward = 1

7. Language setting

centos6: vim /etc/sysconfig/i18n modification LANG="zh_CN.UTF-8"

centos7: localectl set-locale.UTF-8

8, time synchronization

CentOS6

$ ntp
$ ntpq -p

CentOS7

$ chrony
$ chronyc sources

9, 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

Recommended: "

centos usage tutorial"

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