Graylog2

Graylog2 is an open source log management solution that stores your logs in ElasticSearch.

Clean up DB

http://wiki.hackspherelabs.com/index.php?title=Graylog2#Clean_Out_Graylog2_DB

"Cure" for high CPU usage:

service graylog2 stop
cd /opt/elasticsearch-0.19.9/data/graylog2
rm * -rf
/opt/mongo/bin/mongo
use graylog2
db.message_counts.remove()
db.hosts.remove()
exit
service graylog2 start

Send log from python to graylog2 through GELF

See details in https://pypi.python.org/pypi/graypy

Install with easy_install graypy .

   1 #file name testGelf.py
   2 import logging
   3 import graypy
   4 
   5 my_logger = logging.getLogger('test_logger')
   6 my_logger.setLevel(logging.DEBUG)
   7 
   8 handler = graypy.GELFHandler('192.168.1.123', 12201)
   9 my_logger.addHandler(handler)
  10 
  11 my_logger.debug('Hello Graylog2.')
  12 my_logger.debug('Hello Graylog2, %s.'%(datetime.datetime.now() ))
  13 my_logger.info('Inf hello Graylog2, %s.'%(datetime.datetime.now() ))

On graylog2 the following columns are used:

From: hostx
Date: Tue Dec 10 13:14:50 +0000 2013
Severity: Debug
Facility: test_logger
File: testGelf.py:10
thread_name: MainThread
function: <module>
process_name: MainProcess
pid: 27663

Drools example .drl

rule "IMEI"
        when
            m : GELFMessage( shortMessage matches ".*\\s\\d{15}\\s.*" )
        then
          Matcher matcher = Pattern.compile("\\s(\\d{15})\\s").matcher(m.getShortMessage());

          if (matcher.find()) {
            m.addAdditionalData("_imei", matcher.group(1) );
          }
end

rule "IP Port"
        when
            m : GELFMessage( shortMessage matches "^.*\\s\\d+.\\d+.\\d+.\\d+:\\d+\\s.*" )
        then
          Matcher matcher = Pattern.compile("\\s(\\d+.\\d+.\\d+.\\d+):(\\d+)\\s").matcher(m.getShortMessage());

          if (matcher.find()) {
            m.addAdditionalData("_ipaddr", matcher.group(1) );
            m.addAdditionalData("_port", matcher.group(2) );
          }
end

ElasticSearch Queries

http://www.elasticsearchtutorial.com/elasticsearch-in-5-minutes.html

http://joelabrahamsson.com/elasticsearch-101/

curl 'http://localhost:9200/blog/post/_search?q=user:dilbert&pretty=true'

curl -XGET 'http://localhost:9200/blog/_search?pretty=true' -d '
{ 
    "query" : { 
        "range" : { 
            "postDate" : { "from" : "2011-12-10", "to" : "2011-12-12" } 
        } 
    } 
}'

curl -XPOST "http://localhost:9200/_search" -d'
{
    "query": {
        "filtered": {
            "query": {
                "match_all": {
                }
            },
            "filter": {
                "term": { "FieldX": "value1234" }
            }
        }
    }
}'