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1665

answers:

3

Hi, I am working on creating a daemon in Ruby using the daemons gem. I want to add output from the daemon into a log file. So I am wondering what is the easiest way to redirect puts from the console to a log file?

+5  A: 

Try

$stdout = File.new( '/tmp/output', 'w' )

To restore:

$stdout = STDOUT
Pistos
+6  A: 

I should recommend to use ruby logger, it is better than puts, you can have multiple log levels that you can turn on/off: debug, warn, info,error, etc.

 logger = Logger.new(STDOUT)
 logger = Logger.new("/var/log/my-daemon.log")

I use runit package to manage ruby services, it has svlogd than will redirect daemon output to log file, here is run script for logger process:

#!/bin/sh
set -e

LOG=/var/log/my-daemon

test -d "$LOG" || mkdir -p -m2750 "$LOG" && chown nobody:adm "$LOG"
exec chpst -unobody svlogd -tt "$LOG"
VitalieL
+1  A: 

If you need to capture both STDERR and STDOUT and don't want to resort to logging, following is a simple solution adapted from this post:

$stdout.reopen("my.log", "w")
$stdout.sync = true
$stderr.reopen($stdout)
Eric W.