node.js - 如果退出代码!= 0，如何仅使用 PM2 重新启动 Node 进程

Question

我正在使用 pm2管理 Node 进程。目前，pm2 重新启动 Node 进程，即使它干净地完成(退出代码为 0)。我不希望发生这种情况。

相反，我只希望 PM2 在 Node 进程以代码 != 0 退出时重新启动应用程序。

如何做到这一点？

pm2 日志可能有用:

PM2        | App [xxx] with id [0] and pid [44797], exited with code [0] via signal [SIGINT]
PM2        | Starting execution sequence in -fork mode- for app name:xxx id:0
PM2        | App name:xxx id:0 online

编辑:

似乎在集群模式下启动过程如我所料。即:重启仅发生在退出代码 !=0 上。

仍然以 fork 模式启动会产生如上所述的意外行为。

Answer 1

我看了pm2的代码

https://github.com/Unitech/pm2/blob/6090b0971abca6fcb2d796e560f2a72b81ab5707/lib/God.js

在成功退出时不启动进程方面似乎没有任何逻辑。您要求的功能不存在。集群模式和fork模式相同。

您可以使用 test.js

进行测试

setTimeout(()=>process.exit(), 2000);

fork 模式

$ pm2 start test.js && sleep 5
[PM2] Starting /Users/tarunlalwani/Documents/Projects/SO/pm2exit/test.js in fork_mode (1 instance)
[PM2] Done.
┌──────────┬────┬─────────┬──────┬──────┬────────┬─────────┬────────┬─────┬──────────┬──────────────┬──────────┐
│ App name │ id │ version │ mode │ pid  │ status │ restart │ uptime │ cpu │ mem      │ user         │ watching │
├──────────┼────┼─────────┼──────┼──────┼────────┼─────────┼────────┼─────┼──────────┼──────────────┼──────────┤
│ test     │ 0  │ N/A     │ fork │ 5889 │ online │ 0       │ 0s     │ 0%  │ 9.4 MB   │ tarunlalwani │ disabled │
└──────────┴────┴─────────┴──────┴──────┴────────┴─────────┴────────┴─────┴──────────┴──────────────┴──────────┘
 Use `pm2 show <id|name>` to get more details about an app
$ pm2 logs
PM2        | 2019-08-18T11:40:23: PM2 log: App [test:0] exited with code [0] via signal [SIGINT]
PM2        | 2019-08-18T11:40:23: PM2 log: App [test:0] starting in -fork mode-
PM2        | 2019-08-18T11:40:23: PM2 log: App [test:0] online
PM2        | 2019-08-18T11:40:25: PM2 log: App [test:0] exited with code [0] via signal [SIGINT]
PM2        | 2019-08-18T11:40:25: PM2 log: App [test:0] starting in -fork mode-
PM2        | 2019-08-18T11:40:25: PM2 log: App [test:0] online

$ pm2 delete test

$ pm2 start test.js -i 2&& sleep 5
[PM2] Starting /Users/tarunlalwani/Documents/Projects/SO/pm2exit/test.js in cluster_mode (2 instances)
[PM2] Done.
┌──────────┬────┬─────────┬─────────┬──────┬────────┬─────────┬────────┬─────┬───────────┬──────────────┬──────────┐
│ App name │ id │ version │ mode    │ pid  │ status │ restart │ uptime │ cpu │ mem       │ user         │ watching │
├──────────┼────┼─────────┼─────────┼──────┼────────┼─────────┼────────┼─────┼───────────┼──────────────┼──────────┤
│ test     │ 0  │ N/A     │ cluster │ 5993 │ online │ 0       │ 0s     │ 0%  │ 27.6 MB   │ tarunlalwani │ disabled │
│ test     │ 1  │ N/A     │ cluster │ 5994 │ online │ 0       │ 0s     │ 0%  │ 20.8 MB   │ tarunlalwani │ disabled │
└──────────┴────┴─────────┴─────────┴──────┴────────┴─────────┴────────┴─────┴───────────┴──────────────┴──────────┘
 Use `pm2 show <id|name>` to get more details about an app

$ pm2 logs
PM2      | App name:test id:0 disconnected
PM2      | App [test:0] exited with code [0] via signal [SIGINT]
PM2      | App [test:0] starting in -cluster mode-
PM2      | App name:test id:1 disconnected
PM2      | App [test:1] exited with code [0] via signal [SIGINT]
PM2      | App [test:1] starting in -cluster mode-
PM2      | App [test:0] online
PM2      | App [test:1] online
PM2      | App name:test id:0 disconnected
PM2      | App [test:0] exited with code [0] via signal [SIGINT]
PM2      | App [test:0] starting in -cluster mode-
PM2      | App name:test id:1 disconnected
PM2      | App [test:1] exited with code [0] via signal [SIGINT]
PM2      | App [test:1] starting in -cluster mode-
PM2      | App [test:0] online
PM2      | App [test:1] online
PM2      | App name:test id:0 disconnected

$ pm2 delete test

备选

作为替代方案，您可以使用 Supervisord

可以在配置文件中使用exitcodes

http://supervisord.org/configuration.html

The list of “expected” exit codes for this program used with autorestart. If the autorestart parameter is set to unexpected, and the process exits in any other way than as a result of a supervisor stop request, supervisord will restart the process if it exits with an exit code that is not defined in this list.