Lesson 3.9: Start, stop, and check the status of network services

To Check the status of a service

systemctl status <service name>

[root@sanjeeb ~]# systemctl status httpd 
● httpd.service - The Apache HTTP Server
     Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; pres>
     Active: active (running) since Wed 2024-09-25 20:39:11 +0545; 24min >
       Docs: man:httpd.service(8)
   Main PID: 1313 (httpd)
     Status: "Total requests: 0; Idle/Busy workers 100/0;Requests/sec: 0;>
      Tasks: 177 (limit: 22585)
     Memory: 36.3M
        CPU: 3.452s
     CGroup: /system.slice/httpd.service
             ├─1313 /usr/sbin/httpd -DFOREGROUND
             ├─6199 /usr/sbin/httpd -DFOREGROUND
             ├─6200 /usr/sbin/httpd -DFOREGROUND
             ├─6201 /usr/sbin/httpd -DFOREGROUND
             └─6202 /usr/sbin/httpd -DFOREGROUND
 
Sep 25 20:38:46 sanjeeb systemd[1]: Starting The Apache HTTP Server...
Sep 25 20:38:59 sanjeeb httpd[1313]: AH00558: httpd: Could not reliably d>
Sep 25 20:39:11 sanjeeb httpd[1313]: Server configured, listening on: por>

To start a service

systemctl start <service name>

[root@sanjeeb ~]# systemctl start httpd

To start and stop a service in next reboot

To Start in next reboot : systemctl enable <service name>
To Stop in next reboot : systemctl disable <service name>

To check the opened ports

[root@sanjeeb ~]# netstat -tnl 
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:47569           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp6       0      0 :::47571                :::*                    LISTEN     
tcp6       0      0 :::111                  :::*                    LISTEN     
tcp6       0      0 :::80                   :::*                    LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:631                 :::*                    LISTEN

Restarting the Service

Restarting a service will follow the commands systemctl stop <service name>, and the systemctl start <service name>. systemctl restart <service name>

Reloading the Service

Reloading a service will not stop the service, it will reload without making effect to the running process systemctl reload <service name>