服務啟動

1. 查看服務 firewalld 狀態，目前為 active，正在執行中。
   

   [root@kvm4 ~]# systemctl status firewalld.service
   ● firewalld.service - firewalld - dynamic firewall daemon
        Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor>
        Active: active (running) since Fri 2022-09-23 09:45:32 CST; 1 week 6 days >
          Docs: man:firewalld(1)
      Main PID: 640 (firewalld)
         Tasks: 2 (limit: 11111)
        Memory: 42.5M
           CPU: 4.410s
        CGroup: /system.slice/firewalld.service
                └─640 /usr/bin/python3 -s /usr/sbin/firewalld --nofork --nopid
   
   Sep 23 09:45:16 999999 systemd[1]: Starting firewalld - dynamic firewall daemon>
   Sep 23 09:45:32 999999 systemd[1]: Started firewalld - dynamic firewall daemon.
   [root@kvm4 ~]# systemctl status firewalld.service
   ○ firewalld.service - firewalld - dynamic firewall daemon
        Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor>
        Active: inactive (dead) since Thu 2022-10-06 10:13:55 CST; 2s ago
          Docs: man:firewalld(1)
       Process: 640 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS>
      Main PID: 640 (code=exited, status=0/SUCCESS)
           CPU: 5.179s
   
   Sep 23 09:45:16 999999 systemd[1]: Starting firewalld - dynamic firewall daemon>
   Sep 23 09:45:32 999999 systemd[1]: Started firewalld - dynamic firewall daemon.
   Oct 06 10:13:54 kvm4.deyu.wang systemd[1]: Stopping firewalld - dynamic firewal>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: firewalld.service: Deactivated succe>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: Stopped firewalld - dynamic firewall>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: firewalld.service: Consumed 5.179s C>
   

2. 關閉服務 firewalld。
   

   [root@kvm4 ~]# systemctl stop firewalld.service
   

3. 查看服務 firewalld 狀態，目前為 inactive，關閉中。
   

   [root@kvm4 ~]# systemctl status firewalld.service
   ○ firewalld.service - firewalld - dynamic firewall daemon
        Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor>
        Active: inactive (dead) since Thu 2022-10-06 10:13:55 CST; 2s ago
          Docs: man:firewalld(1)
       Process: 640 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS>
      Main PID: 640 (code=exited, status=0/SUCCESS)
           CPU: 5.179s
   
   Sep 23 09:45:16 999999 systemd[1]: Starting firewalld - dynamic firewall daemon>
   Sep 23 09:45:32 999999 systemd[1]: Started firewalld - dynamic firewall daemon.
   Oct 06 10:13:54 kvm4.deyu.wang systemd[1]: Stopping firewalld - dynamic firewal>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: firewalld.service: Deactivated succe>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: Stopped firewalld - dynamic firewall>
   Oct 06 10:13:55 kvm4.deyu.wang systemd[1]: firewalld.service: Consumed 5.179s C>
   

4. 查看服務 firewalld 目前是否啟動？結果為 inactive。
   

   [root@kvm4 ~]# systemctl is-active firewalld.service
   inactive
   

5. 啟動服務 firewalld。
   

   [root@kvm4 ~]# systemctl start firewalld.service
   

6. 再查看服務 firewalld 目前是否啟動？結果為 active。
   

   [root@kvm4 ~]# systemctl is-active firewalld.service
   active
   

7. 也可以用 restart 選項，重新啟動服務 firewalld。
   

   [root@kvm4 ~]# systemctl restart firewalld.service
   

8. 再查看服務 firewalld 目前是否啟動？結果為 active。
   

   [root@kvm4 ~]# systemctl is-active firewalld.service
   active