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Syslog-ng TCP client for node, with basic fault-tolerance.


$ npm install syslog


var syslog = require('syslog');
var logger = syslog.createClient(514, 'localhost');"ping!");

log levels

In increasing order of severity:

  • debug
  • info
  • notice
  • warning
  • error
  • crit
  • alert
  • emerg

These are available as methods on Client, ex: logger.crit().

You may also call the log method, and pass the level as the 2nd argument:

logger.log('fnord!', syslog.LOG_CRIT);

The default level is info.


You will have to configure your syslog server to accept TCP connections. This is usually done in /etc/syslog-ng.conf. Let's say you have an app called fnord, the configuration would look something like this:

source tcp_s {
  tcp(ip( port(514) max-connections(256));
destination fnord_d {
log { source(tcp_s); destination(fnord_d); };

If you have multiple apps which need to log via TCP, you can specify filters, as such:

filter fnord_f { program("fnord"); };

Then modify the log statement to read:

log { source(tcp_s); filter(fnord_f); destination(fnord_d); };

Now if you have another app, called bnord, create similar destination and filter configurations for it, and specify a new log statement, with the same source:

log { source(tcp_s); filter(bnord_f); destination(bnord_d); };

For this to work, you have to make sure you set the process.title variable in your node app.

process.title = 'fnord';

Alternatively, you can pass it as an option to createClient:

syslog.createClient(514, 'localhost', { name: 'fnord' });


See LICENSE file.

Copyright (c) 2011 Alexis Sellier