我正在尝试为一个简单的反应应用程序设置一个 systemd 服务。该应用程序托管在 /home/myuser/test 中。 npm 和 node 都在 PATH 中并硬链接到 /usr/bin。所有文件都具有 myuser:myuser 用户和组的权限。如果我手动启动它，npm start它会正确启动并从以下位置提供应用程序http://localhost:3000
Compiled successfully!
You can now view test in the browser.
Local: http://localhost:3000
On Your Network: http://myipaddress:3000
Note that the development build is not optimized.
To create a production build, use npm run build.
如果我尝试通过 systemd 启动应用程序，它会失败，但没有说明原因。我使用相同的用户从相同的路径启动它，并尝试了 ExecStart 可以想象的所有组合：
ExecStart=npm start
ExecStart=/usr/bin/npm start
ExecStart=/usr/bin/node /home/myuser/test/node_modules/react-scripts/scripts/start.js
它们都产生相同的结果，即它“开始”正常，不久之后就失败了，在journalctl中显然没有任何原因：
$sudo systemctl status node-client
● node-client.service - Node-React Frontend Server
Loaded: loaded (/etc/systemd/system/node-client.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2020-04-08 09:46:10 UTC; 679ms ago
Main PID: 18165 (node)
CGroup: /system.slice/node-client.service
└─18165 /usr/bin/node /home/myuser/test/node_modules/react-scripts/scripts/start.js
Apr 08 09:46:10 hostname systemd[1]: Started Node-React Frontend Server.
Apr 08 09:46:10 hostname systemd[1]: Starting Node-React Frontend Server...
几秒钟后...
$sudo systemctl status node-client
● node-client.service - Node-React Frontend Server
Loaded: loaded (/etc/systemd/system/node-client.service; disabled; vendor preset: disabled)
Active: activating (auto-restart) since Wed 2020-04-08 09:46:00 UTC; 3s ago
Process: 18142 ExecStart=/usr/bin/node /home/ec2-user/test/node_modules/react-scripts/scripts/start.js (code=exited, status=0/SUCCESS)
Main PID: 18142 (code=exited, status=0/SUCCESS)
我不断在journalctl上收到以下信息
-- Logs begin at Tue 2020-03-17 15:04:59 UTC, end at Wed 2020-04-08 09:48:23 UTC. --
Apr 08 09:48:22 hostname systemd[1]: Starting Node-React Frontend Server...
Apr 08 09:48:22 hostname systemd[1]: Started Node-React Frontend Server.
Apr 08 09:48:22 hostname systemd[1]: node-client.service holdoff time over, scheduling restart.
Apr 08 09:48:12 hostname nodeclient[18390]: Starting the development server...
Apr 08 09:48:12 hostname nodeclient[18390]: ℹ ｢wds｣: 404s will fallback to /
Apr 08 09:48:12 hostname nodeclient[18390]: ℹ ｢wds｣: Content not from webpack is served from /home/myuser/test/public
Apr 08 09:48:12 hostname nodeclient[18390]: ℹ ｢wds｣: webpack output is served from
Apr 08 09:48:12 hostname nodeclient[18390]: ℹ ｢wds｣: Project is running at http://myipaddress/
Apr 08 09:48:10 hostname systemd[1]: Starting Node-React Frontend Server...
Apr 08 09:48:10 hostname systemd[1]: Started Node-React Frontend Server.
Apr 08 09:48:10 hostname systemd[1]: node-client.service holdoff time over, scheduling restart.
Apr 08 09:48:00 hostname nodeclient[18368]: Starting the development server...
Apr 08 09:48:00 hostname nodeclient[18368]: ℹ ｢wds｣: 404s will fallback to /
Apr 08 09:48:00 hostname nodeclient[18368]: ℹ ｢wds｣: Content not from webpack is served from /home/myuser/test/public
Apr 08 09:48:00 hostname nodeclient[18368]: ℹ ｢wds｣: webpack output is served from
Apr 08 09:48:00 hosntame nodeclient[18368]: ℹ ｢wds｣: Project is running at http://myipaddress/
systemd 服务文件随着时间的推移而发生变化，但无论 ExecStart 和其他更改如何，错误都是相同的，这是目前的内容：
[Unit]
Description=Node-React Frontend Server
After=syslog.target network.target
[Service]
ExecStart=/usr/bin/node node_modules/react-scripts/scripts/start.js
Restart=always
RestartSec=10s
TimeoutSec=900
User=myuser
Group=myuser
Environment=PATH=/usr/bin:/usr/local/bin
WorkingDirectory=/home/myuser/test/
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=nodeclient
[Install]
WantedBy=multi-user.target
操作系统是Centos7。所有测试都是使用同一用户完成的，没有 sudo，手动和通过 systemd 执行相同的命令。手动启动有效，systemd 无效。
最后，要提一下，我通过 systemd 有 Express-NodeJS 应用程序，并且它使用相同的 systemd 配置正确启动。它只对 React 失败。
任何帮助将不胜感激！
谢谢
尼西
答案1
尝试添加StandardInput=tty-force到您的[Service]部分