Tips & Tricks

Output to Elasticsearch with Rsyslog in Logstash format

This post is just a reminder of how to ship logs directly from rsyslog to Elasticsearch so we have to go trough Logstash.

We got allot of help from the people on the rsyslog mailing list and for me the following is working pretty good so far.

Our config:

module(load="imfile")
module(load="mmjsonparse")
module(load="omelasticsearch")

template(name="logstash-index"
  type="list") {
    constant(value="logstash-")
    property(name="timereported" dateFormat="rfc3339" position.from="1" position.to="4")
    constant(value=".")
    property(name="timereported" dateFormat="rfc3339" position.from="6" position.to="7")
    constant(value=".")
    property(name="timereported" dateFormat="rfc3339" position.from="9" position.to="10")
}

input(type="imfile" File="/var/log/nginx/access.json"
      Tag="nginxulyaoth"
      PersistStateInterval="10000"
      StateFile="nginxulyaoth"
      Severity="info"
      MaxSubmitAtOnce="20000"
      Facility="user"
      Ruleset="nginxrule")

template(name="uly-nginx" type="list") {
  constant(value="{")
  constant(value="\"@timestamp\":\"")     property(name="timereported" dateFormat="rfc3339")
  constant(value="\",\"host\":\"")        property(name="hostname")
  constant(value="\",\"severity\":\"")    property(name="syslogseverity-text")
  constant(value="\",\"facility\":\"")    property(name="syslogfacility-text")
  constant(value="\",\"tag\":\"")         property(name="syslogtag" format="json")
  constant(value="\",\"message\":\"")     property(name="msg" format="json")
  constant(value="\"}")
}

ruleset(name="nginxrule") {
  action(type="mmjsonparse" name="jsonparse")
  action(type="omelasticsearch"
  server="loghost.ulyaoth.net"
  serverport="9200"
  template="uly-nginx"
  searchIndex="logstash-index"
  dynSearchIndex="on"
  errorFile="/var/log/rsyslog/ES-error.log")
}

We are still working on getting the json log split into variables so it will show more nice in Kibana.

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