Linux server, service management --systemctl Detailed command, set the boot from the start

Linux server, service management --systemctl Detailed command, set the boot from the start

syetemclt is the integration of service and chkconfig these two commands, the CentOS 7 began to be used.

Abstract: systemctl Service Manager is a system command, it is actually a combination of service and chkconfig these two commands together.

task	Old instructions	The new directive
Make a service to start automatically	chkconfig --level 3 httpd on	systemctl enable httpd.service
So that a service does not start automatically	chkconfig --level 3 httpd off	systemctl disable httpd.service
Check the service status	service httpd status	systemctl status httpd.service (service details) systemctl is-active httpd.service (display only if Active)
It shows all the services started	chkconfig --list	systemctl list-units --type=service
Start a Service	service httpd start	systemctl start httpd.service
Stop a service	service httpd stop	systemctl stop httpd.service
Restart a service	service httpd restart	systemctl restart httpd.service

 

Below nfs service, for example:

1. Start the nfs service

systemctl start nfs-server.service

2. Set the boot from the start

systemctl enable nfs-server.service

3. Stop the boot from the start

systemctl disable nfs-server.service

4. Review the current state of service

systemctl status nfs-server.service

5. Restart a Service

systemctl restart nfs-server.service

6. Check all started service

systemctl list -units --type=service

22 open firewall ports

iptables -I INPUT -p tcp --dport 22 -j ACCEPT

If the problem persists, it could be due to SELinux

Close SElinux:

Modify / etc / selinux / config file SELINUX = "" to disabled, the restart and then

Completely turn off the firewall:

sudo systemctl status  firewalld.service sudo systemctl stop firewalld.service           sudo systemctl disable firewalld.service