log2gelf

log2gelf

Node.js utility that reads directly from syslog, nginx or apache error log file and send them to a Graylog or Gelf server via TCP or HTTP (TLS or clear).

Usage exemple

Install with npm install log2gelf -g and you're ready to go!

The script is intended to be started on boot to monitor logs effectively. As such, you'll usually want to start it from rc.local or even using a crontab to make sure it's always running.

log2gelf hostname gelfhost gelfport protocol secure logType logfilepath

# exemple
log2gelf web2 logs.mycompany.com 12201 tcp true syslog /var/log/syslog

Parameters

• hostname: arbitrary string
• gelfhost: FQDN or ipv4 address
• gelfport: destination port
• protocol: http or tcp
• secure: boolean indicating if connection is secured (TLS) or clear (GELF server has to be configured adequately)
• logType: syslog, apache or nginx
• logfilepath: absolute path to log file

Log format

syslog

Jun 26 17:10:26 sd-92316 autossh[1109]: ssh child pid is 20591

apache error log

[Sun Jun 26 06:25:07.916957 2016] [mpm_prefork:notice] [pid 28915] AH00163: Apache/2.4.20 (Ubuntu) OpenSSL/1.0.2h configured -- resuming normal operations

nginx error log

2016/06/26 10:08:43 [warn] 28604#28604: no resolver defined to resolve ocsp.int-x3.letsencrypt.org while requesting certificate status, responder: ocsp.int-x3.letsencrypt.org

Launch script

#!/bin/bash

if ! ps aux | grep -v grep | grep "/usr/bin/nodejs /usr/bin/log2gelf"
then
/usr/bin/log2gelf hostname gelfhost 12201 tcp true syslog /var/log/syslog 2>&1 | logger &
fi