问ngrok[14746]：不正确的用法:提供但未定义的标志：-domain

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leafpad /usr/lib/systemd/system/ngrok.service

[Unit]
Description=ngrok server service
After=syslog.target network.target auditd.service

[Service]
Type=simple
User=root

ExecStart=/path/to/ngrok/bin/ngrok -domain=127.0.0.1 -httpAddr=:8000 -httpsAddr=:4443

KillMode=process
Restart=on-failure

[Install]
WantedBy=multi-user.target

systemctl status ngrok.service
● ngrok.service - ngrok server service
   Loaded: loaded (/usr/lib/systemd/system/ngrok.service; enabled; vendor preset: disabled)
   Active: inactive (dead) since Mon 2018-05-28 01:33:21 +0430; 8min ago
  Process: 14746 ExecStart=/home/linux/Downloads/ngrok-stable-linux-amd64/ngrok -domain=127.0.0.1 -httpAddr=:8000 -httpsAddr=:4443 (code=exited, statu
 Main PID: 14746 (code=exited, status=0/SUCCESS)

May 28 01:33:21 Linux ngrok[14746]:    authtoken        save authtoken to configuration file
May 28 01:33:21 Linux ngrok[14746]:    credits        prints author and licensing information
May 28 01:33:21 Linux ngrok[14746]:    http                start an HTTP tunnel
May 28 01:33:21 Linux ngrok[14746]:    start        start tunnels by name from the configuration file
May 28 01:33:21 Linux ngrok[14746]:    tcp                start a TCP tunnel
May 28 01:33:21 Linux ngrok[14746]:    tls                start a TLS tunnel
May 28 01:33:21 Linux ngrok[14746]:    update        update ngrok to the latest version
May 28 01:33:21 Linux ngrok[14746]:    version        print the version string
May 28 01:33:21 Linux ngrok[14746]:    help                Shows a list of commands or help for one command
May 28 01:33:21 Linux ngrok[14746]: Incorrect Usage: flag provided but not defined: -domain