检查Apache服务状态

你可以使用以下命令检查Apache服务的状态：

systemctl status apache2

如果Apache正在运行，输出应该类似于以下内容：

● apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2021-04-08 11:07:03 UTC; 6 days ago
     Docs: https://httpd.apache.org/docs/2.4/
 Main PID: 1234 (apache2)
    Tasks: 55 (limit: 4915)
   CGroup: /system.slice/apache2.service
           ├─1234 /usr/sbin/apache2 -k start
           ├─5678 /usr/sbin/apache2 -k start
           └─5679 /usr/sbin/apache2 -k start

如果Apache没有运行，输出应该类似于以下内容：

● apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Thu 2021-04-08 11:07:03 UTC; 6 days ago
     Docs: https://httpd.apache.org/docs/2.4/
  Process: 1234 ExecStart=/usr/sbin/apache2 -k start (code=exited, status=0/SUCCESS)
 Main PID: 1234 (code=exited, status=0/SUCCESS)

在这种情况下，您可以使用以下命令来启动Apache服务：

sudo systemctl start apache2