我试图开始一个项目
node index.js，我知道了
events.js:173
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE: address already in use :::3000
at Server.setupListenHandle [as _listen2] (net.js:1255:14)
at listenInCluster (net.js:1303:12)
at Server.listen (net.js:1391:7)
at Function.listen (/home/forge/bheng/public/ios-base-api/node_modules/express/lib/application.js:618:24)
at Object.<anonymous> (/home/forge/bheng/public/ios-base-api/index.js:156:5)
at Module._compile (internal/modules/cjs/loader.js:721:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:732:10)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
Emitted 'error' event at:
at emitErrorNT (net.js:1282:8)
at internalTickCallback (internal/process/next_tick.js:72:19)
at process._tickCallback (internal/process/next_tick.js:47:5)
at Function.Module.runMain (internal/modules/cjs/loader.js:777:11)
at executeUserCode (internal/bootstrap/node.js:342:17)
at startExecution (internal/bootstrap/node.js:276:5)
at startup (internal/bootstrap/node.js:227:5)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
然后，我跑了lsof -i | grep 3000，我得到了
node 6159 root 19u IPv6 58371978 0t0 TCP *:3000 (LISTEN)
然后，我跑了ps -aux | grep node，我得到了
root 448 0.0 1.4 569912 29600 ? Ssl 21:21 0:00 node /usr/bin/pm2 update
root 1266 0.0 1.5 569400 31628 ? Ssl 21:28 0:00 node /usr/bin/pm2 update
root 6159 1.0 2.4 845540 49568 ? Ssl 21:46 0:02 node /home/forge/bheng/public/ios-base-api/index.js
root 6482 0.0 0.0 11244 948 pts/3 S+ 21:50 0:00 grep --color=auto node
root 32233 0.0 1.4 569912 29876 ? Ssl 21:14 0:00 node /usr/bin/pm2 update
我只想在后台启动我的nodejs应用，并能够随时访问我的端点。
为什么这么复杂？