There is a new command named “systemctl” on CentOS 7 or RHEL 7 system, this command control the systemd system and service manager. and may be used to introspect and control the state of the system and service manager. it is integrated with “chkconfig” and “service” command. How to use this command in centos 7 system? this post will show you some examples.
CentOS 7 / RHEL 7 Systemctl Command To Start/Stop Service
Assuming you want to start or stop a apache service using the following command:
systemctl start httpd.service #====> start httpd service systemctl stop httpd.service #===> stop httpd service systemctl restart httpd.service #===> restart httpd service
If you want tostart the service automatically while system startup, issue the following command:
systemctl enable httpd.service #====> start httpd.service while system startup systemctl disable httpd.service #====> do not start httpd.service while system startup
CentOS 7 / RHEL 7 Systemctl Command Check Service Status
Using the following systemctl command to check the status of one service , type:
systemctl status *.service
Example: checking the status of smartd service
[root@osetc Desktop]# systemctl status httpd.service httpd.service Loaded: not-found (Reason: No such file or directory) Active: inactive (dead) [root@osetc Desktop]# systemctl status smartd.service smartd.service - Self Monitoring and Reporting Technology (SMART) Daemon Loaded: loaded (/usr/lib/systemd/system/smartd.service; enabled) Active: active (running) since Wed 2014-12-03 09:13:30 EST; 1h 53min ago Main PID: 810 (smartd) CGroup: /system.slice/smartd.service └─810 /usr/sbin/smartd -n -q never Dec 03 09:13:30 itsprite systemd[1]: Started Self Monitoring and Reporting ...n. Dec 03 09:13:31 itsprite smartd[810]: smartd 6.2 2013-07-26 r3841 [x86_64-l...d) Dec 03 09:13:31 itsprite smartd[810]: Copyright (C) 2002-13, Bruce Allen, C...rg Dec 03 09:13:31 itsprite smartd[810]: Opened configuration file /etc/smartm...nf Dec 03 09:13:31 itsprite smartd[810]: Configuration file /etc/smartmontools...es Dec 03 09:13:31 itsprite smartd[810]: Device: /dev/sda, opened Dec 03 09:13:31 itsprite smartd[810]: Device: /dev/sda, [VMware, VMware Vi...GB Dec 03 09:13:31 itsprite smartd[810]: Device: /dev/sda, IE (SMART) not enab...ce Dec 03 09:13:31 itsprite smartd[810]: Try 'smartctl -s on /dev/sda' to turn...es Dec 03 09:13:31 itsprite smartd[810]: Monitoring 0 ATA and 0 SCSI devices Hint: Some lines were ellipsized, use -l to show in full.