Systemctl 配置 Nginx 自启动显示超时

nginx.service 是这样编写的

    [Unit]
    Description=A high performance web server and a reverse proxy server
    After=network.target network-online.target nss-lookup.target

    [Service]
    Type=forking
    PIDFile=/usr/local/nginx/logs/nginx.pid
    PrivateDevices=yes
    SyslogLevel=err

    ExecStart=/usr/local/nginx/sbin/nginx -g 'pid /usr/local/nginx/logs/nginx.pid; error_log stderr;'
    ExecReload=/usr/local/nginx/sbin/nginx -s reload
    KillMode=mixed

    [Install]
    WantedBy=multi-user.target

开机后 Nginx 没有正确启动

    $ sudo systemctl status nginx
    * nginx.service - A high performance web server and a reverse proxy server
       Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)
       Active: failed (Result: timeout) since Sat 2018-08-04 16:26:14 CST; 10s ago

    Aug 04 16:24:44 isthnew systemd[1]: Starting A high performance web server and a reverse proxy server...
    Aug 04 16:26:14 isthnew systemd[1]: nginx.service: Start operation timed out. Terminating.
    Aug 04 16:26:14 isthnew systemd[1]: nginx.service: Failed with result 'timeout'.
    Aug 04 16:26:14 isthnew systemd[1]: Failed to start A high performance web server and a reverse proxy server.

系统是 Arch，nginx 版本 1.15.2，貌似很早之前就出现过了，但是没注意，开机后使用 sudo systemctl start nginx 来启动 nginx 一问题都没有。