使用 nodejs 的 Forever 将 console.logs 输出到屏幕

Question

I just discovered that my nodejs app keeps crashing, so I've used forever app.js to start my app and have it automatically restarted when it crashes.

Problem: Now my app outputs alot of useful information as it runs via console.log and util.log . I used to use screen to run the node app, but now that I'm using forever to run the nodejs app, I can no longer see all the outputs.

Is there any way to see all the output from the nodejs app in realtime?

Answer 1

You can watch a logfile live by using this shell-command.

 tail -f /path/to/logfile

Not sure if this is what you needed.

Answer 2

Directly with forever command :

forever logs app.js -f

It shows in realtime output of your application and forever logs (shows detected changes & restart messages).

Answer 3

Simplest way to go is

Run :

forever logs // will give you list of log files
forever logs 0 -f // then just provide the index of log

Answer 4

If you pass the --help flag to Forever you'll see this example:

forever -o out.log -e err.log my-script.js

-o and -e define the stdout and stderr log files.

-o  OUTFILE      Logs stdout from child script to OUTFILE
-e  ERRFILE      Logs stderr from child script to ERRFILE

Forever seems a little overkill for development. Give Supervisor a shot and see if you like it better:

npm install -g supervisor
supervisor app.js

Answer 5

I am running nodejs on AWS EC2 instance and this worked for me. Note: logs are accessible if you are root owner. So first use sudo su then

forever -a -o out.log -e err.log yourServerApp.js

It will tail console log (in case you track event messages from log) and error log. I hope it helps someone.

Answer 6

linux : tail -f /path/to/logfile.log
windows : enter PowerShell -> Get-Content /path/to/logfile.log -Wait -Tail 1000