Question

当我使用PM2运行多个进程（即群集模式）并且其中一个进程遇到未被捕获的错误时，PM2不会重新启动该进程。
为什么呢？
如何使其以群集模式重新启动工作程序？

示例代码

// index.js
let counter = 0;
setInterval(function(){
  if(counter >= 5) {
    throw new Error('Worker crash. Why no restart?');
  }
  counter++;
  console.log('Worker alive: ' + Date.now() );
},500);

在cmd行上运行

pm2 start index.js -i 4
pm2 log

最终所有工人都崩溃了，再也没有重新开始如果它只能在一个进程上完成，那么重启的重点是什么。

pm2日志（合并为单个文件）

    Worker alive: 1522937847186
Worker alive: 1522937847231
Worker alive: 1522937847276
Worker alive: 1522937847324
Worker alive: 1522937847691
Worker alive: 1522937847736
Worker alive: 1522937847781
Worker alive: 1522937847830
Worker alive: 1522937848193
Worker alive: 1522937848238
Worker alive: 1522937848283
Worker alive: 1522937848332
Worker alive: 1522937848693
Worker alive: 1522937848738
Worker alive: 1522937848783
Worker alive: 1522937848832
Worker alive: 1522937849194
Worker alive: 1522937849238
Worker alive: 1522937849284
Worker alive: 1522937849333
Error: Worker crash. Why no restart?
    at Timeout._onTimeout (/home/usrname/docs/Projects_NodeJS/project/app/index.js:49:11)
    at ontimeout (timers.js:466:11)
    at tryOnTimeout (timers.js:304:5)
    at Timer.listOnTimeout (timers.js:267:5)
Error: Worker crash. Why no restart?
    at Timeout._onTimeout (/home/usrname/docs/Projects_NodeJS/project/app/index.js:49:11)
    at ontimeout (timers.js:466:11)
    at tryOnTimeout (timers.js:304:5)
    at Timer.listOnTimeout (timers.js:267:5)
Error: Worker crash. Why no restart?
    at Timeout._onTimeout (/home/usrname/docs/Projects_NodeJS/project/app/index.js:49:11)
    at ontimeout (timers.js:466:11)
    at tryOnTimeout (timers.js:304:5)
    at Timer.listOnTimeout (timers.js:267:5)
Error: Worker crash. Why no restart?
    at Timeout._onTimeout (/home/usrname/docs/Projects_NodeJS/project/app/index.js:49:11)
    at ontimeout (timers.js:466:11)
    at tryOnTimeout (timers.js:304:5)
    at Timer.listOnTimeout (timers.js:267:5)

Answer 1

您可以尝试以下代码。如果有帮助，请告诉我。

const cluster = require('cluster');
const numOfCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < numOfCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log('worker %d died (%s). restarting...',
        worker.process.pid, signal || code);
    cluster.fork();
  });
}

Answer 2

降级到Node版本8 LTS似乎解决了这个问题。

我安装了Node版本9，并且在Windows和Ubuntu上都出现了问题，但是当我降级到版本8时，一切正常。

PM2未在错误时重新启动集群

2 个答案: