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

$ npm install syslog

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

logger.info("ping!");

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(0.0.0.0) port(514) max-connections(256));
};
destination fnord_d {
  file("/var/log/fnord.log");
};
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