I understand that Logstash is for aggregating and processing logs. I have NGIX logs and had Logstash config setup as:
filter {
grok {
match => [ "message" , "%{COMBINEDAPACHELOG}+%{GREEDYDATA:extra_fields}"]
overwrite => [ "message" ]
}
mutate {
convert => ["response", "integer"]
convert => ["bytes", "integer"]
convert => ["responsetime", "float"]
}
geoip {
source => "clientip"
target => "geoip"
add_tag => [ "nginx-geoip" ]
}
date {
match => [ "timestamp" , "dd/MMM/YYYY:HH:mm:ss Z" ]
remove_field => [ "timestamp" ]
}
useragent {
source => "agent"
}
}
output {
elasticsearch {
hosts => ["localhost:9200"]
index => "weblogs-%{+YYYY.MM}"
document_type => "nginx_logs"
}
stdout { codec => rubydebug }
}
This would parse the unstructured logs into a structured form of data, and store the data into monthly indexes.
What I discovered is that the majority of logs were contributed by robots/web-crawlers. In python I would filter them out by:
browser_names = browser_names[~browser_names.str.\
match('^[\w\W]*(google|bot|spider|crawl|headless)[\w\W]*$', na=False)]
However, I would like to filter them out with Logstash so I can save a lot of disk space in Elasticsearch server. Is there a way to do that? Thanks in advance!
Thanks LeBigCat for generously giving a hint. I solved this problem by adding the following under the filter:
if [browser_names] =~ /(?i)^[\w\W]*(google|bot|spider|crawl|headless)[\w\W]*$/ {
drop {}
}
the (?i) flag is for case insensitive matching.
In your filter you can ask for drop (https://www.elastic.co/guide/en/logstash/current/plugins-filters-drop.html). As you already got your pattern, should be pretty fast ;)
Related
I'm forwarding application logs to elasticsearch, while performing some grok filters before.
The application has a timestamp field and there's the timestamp field of logstash itself.
We regularly check the difference between those timestamp, and on many cases the delay is very big, meaning the log took very long time to be shipped to elasticsearch.
I'm wondering how can I isolate the issue to know if the delay is coming from logstash or elasticsearch.
Example logstash scrape config:
input {
file {
path => "/app/app-core/_logs/app-core.log"
codec => multiline {
pattern => "(^[a-zA-Z.]+(?:Error|Exception).+)|(^\s+at .+)|(^\s+... \d+ more)|(^\t+)|(^\s*Caused by:.+)"
what => "previous"
}
}
}
filter {
if "multiline" not in [tags]{
json {
source => "message"
remove_field => ["[request][body]","[response][body][response][items]"]
}
}
else {
grok {
pattern_definitions => { APPJSON => "{.*}" }
match => { "message" => "%{APPJSON:appjson} %{GREEDYDATA:stack_trace}"}
remove_field => ["message"]
}
json {
source => "appjson"
remove_field => ["appjson"]
}
}
}
output {
elasticsearch {
hosts => ["elasticsearch-logs.internal.app.io:9200"]
index => "logstash-core-%{+YYYY.MM.dd}"
document_type => "logs"
}
}
We tried adjusting the number of workers and batch size, no value we tried reduced the delay:
pipeline.workers: 9
pipeline.output.workers: 9
pipeline.batch.size: 600
pipeline.batch.delay: 5
Nothing was done on the elasticsearch side because I think the issue is with logstash, but I'm not sure.
I am trying to configure logstash to aggregate similar syslog based on a message field and in a specific timestamp.
To make my case clear, this is an example of what I would like to do.
example: I have those junk syslog coming through my logstash
timestamp. message
13:54:24. hello
13:54:35. hello
What I would like to do is have a condition that check if the message are the same and those message occurs in a specific timespan (for example 10min) I would like to aggregate them into one row, and increase the count
the output I am expecting to see is as follow
timestamp. message. count
13.54.35. hello. 2
I know and I saw that there is the opportunity to aggregate the fields, but I was wondering if there is a chance to do this aggregation based on a specific time range
If anyone can help me I would be extremely grateful as I am new to logstash and I have the problem that in my server I am receiving tons of junk syslog and I would like to reduce that amount.
So far I did some cleaning with this configuration
input {
syslog {
port => 514
}
}
filter {
prune {
whitelist_names =>["timestamp","message","newfield"]
}
mutate {
add_field => {"newfield" => "%{#timestamp}%{message}"}
}
}
output {
elasticsearch {
hosts => ["localhost:9200"]
index => "logstash_index"
}
stdout {
codec => rubydebug
}
}
Now I just need to do the aggregation.
Thank you so much for your help guys
EDIT:
Following the documentation, I put in place this configuration:
input {
syslog {
port => 514
}
}
filter {
prune {
whitelist_names =>["timestamp","message","newfield"]
}
mutate {
add_field => {"newfield" => "%{#timestamp}%{message}"}
}
if [message] =~ "MESSAGE FROM" {
aggregate {
task_id => "%{message}"
code => "map['message'] ||= 0; map['message'] += 1;"
push_map_as_event_on_timeout => true
timeout_task_id_field => "message"
timeout => 60
inactivity_timeout => 50
timeout_tags => ['_aggregatetimeout']
timeout_code => "event.set('count_message', event.get('message') > 1)"
}
}
}
output {
elasticsearch {
hosts => ["localhost:9200"]
index => "logstash_index"
}
stdout {
codec => rubydebug
}
}
I don't get any error but the output is not what I am expecting.
The actual output is that it create a tag field (Good) passing an array with _aggregationtimeout and _aggregationexception
{
"message" => "<88>MESSAGE FROM\r\n",
"tags" => [
[0] "_aggregatetimeout",
[1] "_aggregateexception"
],
"#timestamp" => 2021-07-23T12:10:45.646Z,
"#version" => "1"
}
Im having a problem with ELK Stack + Filebeat.
Filebeat is sending apache-like logs to Logstash, which should be parsing the lines. Elasticsearch should be storing the split data in fields so i can visualize them using Kibana.
Problem:
Elasticsearch recieves the logs but stores them in a single "message" field.
Desired solution:
Input:
10.0.0.1 some.hostname.at - [27/Jun/2017:23:59:59 +0200]
ES:
"ip":"10.0.0.1"
"hostname":"some.hostname.at"
"timestamp":"27/Jun/2017:23:59:59 +0200"
My logstash configuration:
input {
beats {
port => 5044
}
}
filter {
if [type] == "web-apache" {
grok {
patterns_dir => ["./patterns"]
match => { "message" => "IP: %{IPV4:client_ip}, Hostname: %{HOSTNAME:hostname}, - \[timestamp: %{HTTPDATE:timestamp}\]" }
break_on_match => false
remove_field => [ "message" ]
}
date {
locale => "en"
timezone => "Europe/Vienna"
match => [ "timestamp", "dd/MMM/yyyy:HH:mm:ss Z" ]
}
useragent {
source => "agent"
prefix => "browser_"
}
}
}
output {
stdout {
codec => rubydebug
}
elasticsearch {
hosts => ["localhost:9200"]
index => "test1"
document_type => "accessAPI"
}
}
My Elasticsearch discover output:
I hope there are any ELK experts around that can help me.
Thank you in advance,
Matthias
The grok filter you stated will not work here.
Try using:
%{IPV4:client_ip} %{HOSTNAME:hostname} - \[%{HTTPDATE:timestamp}\]
There is no need to specify desired names seperately in front of the field names (you're not trying to format the message here, but to extract seperate fields), just stating the field name in brackets after the ':' will lead to the result you want.
Also, use the overwrite-function instead of remove_field for message.
More information here:
https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html#plugins-filters-grok-options
It will look similar to that in the end:
filter {
grok {
match => { "message" => "%{IPV4:client_ip} %{HOSTNAME:hostname} - \[%{HTTPDATE:timestamp}\]" }
overwrite => [ "message" ]
}
}
You can test grok filters here:
http://grokconstructor.appspot.com/do/match
I copied
{"name":"myapp","hostname":"banana.local","pid":40161,"level":30,"msg":"hi","time":"2013-01-04T18:46:23.851Z","v":0}
from https://github.com/trentm/node-bunyan and save it as my logs.json. I am trying to import only two fields (name and msg) to ElasticSearch via LogStash. The problem is that I depend on a sort of filter that I am not able to accomplish. Well I have successfully imported such line as a single message but certainly it is not worth in my real case.
That said, how can I import only name and msg to ElasticSearch? I tested several alternatives using http://grokdebug.herokuapp.com/ to reach an useful filter with no success at all.
For instance, %{GREEDYDATA:message} will bring the entire line as an unique message but how to split it and ignore all other than name and msg fields?
At the end, I am planing to use here:
input {
file {
type => "my_type"
path => [ "/home/logs/logs.log" ]
codec => "json"
}
}
filter {
grok {
match => { "message" => "data=%{GREEDYDATA:request}"}
}
#### some extra lines here probably
}
output
{
elasticsearch {
codec => json
hosts => "http://127.0.0.1:9200"
index => "indextest"
}
stdout { codec => rubydebug }
}
I have just gone through the list of available Logstash filters. The prune filter should match your need.
Assume you have installed the prune filter, your config file should look like:
input {
file {
type => "my_type"
path => [ "/home/logs/logs.log" ]
codec => "json"
}
}
filter {
prune {
whitelist_names => [
"#timestamp",
"type",
"name",
"msg"
]
}
}
output {
elasticsearch {
codec => json
hosts => "http://127.0.0.1:9200"
index => "indextest"
}
stdout { codec => rubydebug }
}
Please be noted that you will want to keep type for Elasticsearch to index it into a correct type. #timestamp is required if you will view the data on Kibana.
Basic is a float field. The mentioned index is not present in elasticsearch. When running the config file with logstash -f, I am getting no exception. Yet, the data reflected and entered in elasticsearch shows the mapping of Basic as string. How do I rectify this? And how do I do this for multiple fields?
input {
file {
path => "/home/sagnik/work/logstash-1.4.2/bin/promosms_dec15.csv"
type => "promosms_dec15"
start_position => "beginning"
sincedb_path => "/dev/null"
}
}
filter {
grok{
match => [
"Basic", " %{NUMBER:Basic:float}"
]
}
csv {
columns => ["Generation_Date","Basic"]
separator => ","
}
ruby {
code => "event['Generation_Date'] = Date.parse(event['Generation_Date']);"
}
}
output {
elasticsearch {
action => "index"
host => "localhost"
index => "promosms-%{+dd.MM.YYYY}"
workers => 1
}
}
You have two problems. First, your grok filter is listed prior to the csv filter and because filters are applied in order there won't be a "Basic" field to convert when the grok filter is applied.
Secondly, unless you explicitly allow it, grok won't overwrite existing fields. In other words,
grok{
match => [
"Basic", " %{NUMBER:Basic:float}"
]
}
will always be a no-op. Either specify overwrite => ["Basic"] or, preferably, use mutate's type conversion feature:
mutate {
convert => ["Basic", "float"]
}