I'm using filebeat to send log to logstash but I'm having issues with grok syntax on Logstash. I used the grok debugger on Kibanna and manager to come to a solution.
The problem is that I can't find the same syntax for Logstash.
The original log :
{"log":"188.188.188.188 - tgaro [22/Aug/2022:11:37:54 +0200] \"PROPFIND /remote.php/dav/files/xxx#yyyy.com/ HTTP/1.1\" 207 1035 \"-\" \"Mozilla/5.0 (Windows) mirall/2.6.1stable-Win64 (build 20191105) (Nextcloud)\"\n","stream":"stdout","time":"2022-08-22T09:37:54.782377901Z"}
The message receive in Logstash :
"message" => "{\"log\":\"188.188.188.188 - tgaro [22/Aug/2022:11:37:54 +0200] \\\"PROPFIND /remote.php/dav/files/xxx#yyyy.com/ HTTP/1.1\\\" 207 1035 \\\"-\\\" \\\"Mozilla/5.0 (Windows) mirall/2.6.1stable-Win64 (build 20191105) (Nextcloud)\\\"\\n\",\"stream\":\"stdout\",\"time\":\"2022-08-22T09:37:54.782377901Z\"}",
The Grok Pattern i used on Grok Debugger (Kibana):
{\\"log\\":\\"%{IPORHOST:clientip} %{HTTPDUSER:ident} %{HTTPDUSER:auth} \[%{HTTPDATE:timestamp}\] \\\\\\"(?:%{WORD:verb} %{NOTSPACE:request}(?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest})\\\\\\" (?:-|%{NUMBER:response}) (?:-|%{NUMBER:bytes}) \\\\\\("%{DATA:referrer}\\\\\\") \\\\\\"%{DATA:user-agent}\\\\\\"
The real problem is that I can't even manage to get the IP (188.188.188.188).
I tried :
match => { "message" => '{\\"log\\":\\"%{IPORHOST:clientip}' # backslash to escape the backslash
match => { "message" => '{\\\"log\\\":\\\"%{IPORHOST:clientip}' # backslash to escape the quote
match => { "message" => "{\\\"log\\\":\\\"%{IPORHOST:clientip}" # backslash to escape the quote
Help would be appreciated
Thanks !
ps : The log used here is shrink. The real log is mixed with Json and string so i can't send it as Json in Filebeat.
Ok, so i manage to make it work by using this :
grok {
match => { "message" => '%{SYSLOGTIMESTAMP:syslog_timestamp} %{IPORHOST:syslog_server} %{WORD:syslog_tag}: %{GREEDYDATA:jsonMessage}' }
}
json {
source => "jsonMessage"
}
grok {
match => { "jsonMessage" => '%{IPORHOST:clientip} %{HTTPDUSER:ident} %{HTTPDUSER:auth} \[%{HTTPDATE:timestamp}\] \\"(?:%{WORD:verb} %{NOTSPACE:request}(?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest})\\" (?:-|%{NUMBER:response}) (?:-|%{NUMBER:bytes}) \\("%{DATA:referrer}\\") \\"%{DATA:user-agent}\\"'}
}
with log like this :
Aug 24 00:00:01 hostname containers: {"log":"188.188.188.188 - user.name#things.com [23/Aug/2022:23:59:52 +0200] \"PROPFIND /remote.php/dav/files/ HTTP/1.1\" 207 1159 \"-\" \"Mozilla/5.0 (Linux) mirall/3.4.2-1ubuntu1 (Nextcloud, ubuntu-5.15.0-46-generic ClientArchitecture: x86_64 OsArchitecture: x86_64)\"\n","stream":"stdout","time":"2022-08-23T21:59:52.612843092Z"}
The first match will fetch the first 3 field (time, hostname and tag), and then get everything after the : with the pattern GREEDYDATA in the jsonMessage.
Than the json filter is used on the jsonMessage. Since then, we have the information needed in the new field log created by using the json filter.
I still don't understand why my grok work on Kibanna debugger but not on Logstash. I mean it's probably because some character needs to be escaped. But even when i escape them it didn't work.
#RaiZy_Style has already filtered out the JSON using the JSON Filter and trying to match the jsonMessage using the GROK Filter
I used the GROK Debugger to create a grok pattern that will match jsonMessage field.
The jsonMessage that I assumed coming after using the JSON Filter for the above log example is:
188.188.188.188 - user.name#things.com [23/Aug/2022:23:59:52 +0200] \\"PROPFIND /remote.php/dav/files/ HTTP/1.1\\" 207 1159 \\"-\\" \\"Mozilla/5.0 (Linux) mirall/3.4.2-1ubuntu1 (Nextcloud, ubuntu-5.15.0-46-generic ClientArchitecture: x86_64 OsArchitecture: x86_64)\\"\\n"
Here is pattern that will work:
%{IPORHOST:clientip} %{USER:ident} %{DATA:auth} \[%{HTTPDATE:timestamp}\] \\\\"(?:%{WORD:verb} %{NOTSPACE:request}(?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest})" %{NUMBER:response} (?:%{NUMBER:bytes}|-) \\\\"
Output Screenshot:
Note: If you want to expand the rawrequest field value into individual filed, it can be done also.
Related
I have just started using grok for logstash and I am trying to parse my log file line below using grok filter.
10.210.57.60 0x756682x2 connectadmin [12/May/2020:00:00:00 +0530] "GET /rest/auth/1/session HTTP/1.1" 200 286 456 "-" "Jersey/2.11 (HttpUrlConnection 1.8.0_171)" "1twyrho"
I am interested in :
IP : 10.210.57.60 //
user : connectadmin //
timestamp : 12/May/2020:00:00:00 +0530 //
URL : /rest/auth/1/session //
Response Code : 200
I am currently stuck with the grok expression : %{IPV4:client_ip} %{WORD:skip_me1} %{USERNAME}
by which I am able to get IP and username. Can you please help me proceed.
Thank You..
I have used grok debugger https://grokdebug.herokuapp.com/ to get the desired output.
Below is the grok pattern that will match your requirement:
%{IPV4:IP} %{GREEDYDATA:girbish} %{USERNAME:user} \[%{HTTPDATE:timestamp}\] "(?:%{WORD:verb} %{NOTSPACE:request}(?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest})" %{NUMBER:response} (?:%{NUMBER:bytes}|-) %{GREEDYDATA:girbish}
Also, below is the screenshot of final output after using the grok pattern
Note: You can remove unnecessary fields using mutate filter of logstash.
I'm using logstash with a configuration input{rabbitmq} filter{grok} output{elastic}
From rabbit I receive nginx logs in this format :
- - [06/Mar/2017:15:45:53 +0000] "GET /check HTTP/1.1" 200 0 "-" "ELB-HealthChecker/2.0"
and I'm using grok filter as simple as follow :
filter{
if [type] == "nginx" {
grok{
match => { "message" => "%{NGINXACCESS}" }
}
}
}
and the pattern is
NGUSERNAME [a-zA-Z\.\#\-\+_%]+
NGUSER %{NGUSERNAME}
NGINXACCESS %{NGUSER:ident} %{NGUSER:auth} \[%{HTTPDATE:timestamp}\] "%{WORD:verb} %{URIPATHPARAM:request} HTTP/%{NUMBER:httpversion}" %{NUMBER:response} (?:%{NUMBER:bytes}|-) (?:"(?:%{URI:referrer}|-)"|%{QS:referrer}) %{QS:agent}
I tried the pattern in grok debugger and it seems to work just fine but running the pipeline i get this error
[2017-03-06T16:46:40,692][ERROR][logstash.codecs.json ] JSON parse error, original data now in message field {:error=>#, :data=>"- - [06/Mar/2017:16:46:40 +0000] \"GET /check HTTP/1.1\" 200 0 \"-\" \"ELB-HealthChecker/2.0\""}
it seems like someone(logstash?) is adding \ to the result...
hope to get some help, thanks!
This does not seem to be a grok error at all. if grok fails to parse it will add a tag _grokparsefailure to your event. A JSON parse error would be due to your input trying to read codec => json {} when your log format is plainly not JSON. Make sure that your input plugin that is handling these log types is using codec => plain or an appropriate type.
See logstash codecs for more info.
Need your help in custom log parsing through logstash
Here is the log format that I am trying to parse through logstash
2015-11-01 07:55:18,952 [abc.xyz.com] - /Enter, G, _null, 2702, 2, 2, 2, 2, PageTotal_1449647718950_1449647718952_2_App_e9c00521-eeec-4d47-bf5b-b842ec14a4ff_178.255.153.2___, , , NEW,
And my logstash conf file looks like below
input {
file {
path => [ "/tmp/access.log" ]
}
}
filter{
grok {
match => { "message" => "%{TIMESTAMP_ISO8601:timestamp} %{GREEDYDATA:message}" }
}
date {
match => ["timestamp","yyyy-MM-dd HH:mm:ss,SSSS"]
}
}
For some reason running the logstash command passing the conf file doesnt parse the logs, not sure whats wrong with the config. Any help would be highly appreciated.
bin/logstash -f conf/access_log.conf
Settings: Default filter workers: 6
Logstash startup completed
I have checked your Grok Match filter and is fine with:
Grok Debugger
You don't have to use the date matcher because the grok matcher already correctly match the TIMESTAMP_ISO8601 timestamp.
I think your problem is with "since_db" file.
Here is the documentation:
since_db
In few words, logstash remember if a file is already read and doesn't read it anymore. Logstash remember if one file was already read because write it in the since Database.
If you would like to test your filter reading always the same file, you could try:
input {
file {
path => [ "/tmp/access.log" ]
sincedb_path => "/dev/null"
}
}
Regards
I'm setting up Elasticsearch, Logstash and Kibana. I encountered an error when I am configuring "logstash.conf". Here's the error I got.
{:timestamp=>"2015-05-25T21:56:59.907000-0400", :message=>"Error: Expected one of #, {, ,, ] at line 12, column 49 (byte 265) after filter {\n grok {\n match => [\"message\", \"<log4j:event logger=\""}
{:timestamp=>"2015-05-25T21:56:59.915000-0400", :message=>"You may be interested in the '--configtest' flag which you can\nuse to validate logstash's configuration before you choose\nto restart a running system."}
This is my logstash.conf
grok {
match => ["message", "<log4j:event logger="%{DATA:emitter}" timestamp="%{BASE10NUM:timestamp}" level="%{LOGLEVEL:level}" thread="%{DATA:thread}">, <log4j:message><%{GREEDYDATA:message}></log4j:message>" ]
}
I am new to ELK.
Since your grok pattern contains double quotes you have to either
escape the double quotes inside the expression by preceding them with a backslash, or
use single quotes as the pattern string delimiter.
Example 1:
grok {
match => ["message", "<log4j:event logger=\"%{DATA:emitter}\" ..." ]
}
Example 2:
grok {
match => ["message", '<log4j:event logger="%{DATA:emitter}" ...' ]
}
I have php log of this format
[Day Mon DD HH:MM:SS YYYY] [Log-Type] [client <ipv4 ip address>] <some php error type>: <other msg with /path/of/a/php/script/file.php and something else>
[Day Mon DD HH:MM:SS YYYY] [Log-Type] [client <ipv4 ip address>] <some php error type>: <other msg without any file name in it>
[Day Mon DD HH:MM:SS YYYY] [Log-Type] [client <ipv4 ip address>] <some msg with out semicolon in it but /path/of/a/file inside the message>
This I am trying to send to Graylog2 after processing through logstash. Using this post here, I was able to start. now I would like to get some additional fields, so that my final version would look something like this.
{
"message" => "<The entire error message goes here>",
"#version" => "1",
"#timestamp" => "converted timestamp from Day Mon DD HH:MM:SS YYYY",
"host" => "<ipv4 ip address>",
"logtime" => "Day Mon DD HH:MM:SS YYYY",
"loglevel" => "Log-Type",
"clientip" => "<ipv4 ip address>",
"php_error_type" => "<some php error type>"
"file_name_from_the_log" => "/path/of/a/file || /path/of/a/php/script/file.php"
"errormsg" => "<the error message after first colon (:) found>"
}
I have the expression for individual line, or atleast I think these should be able to parse, using grokdebugger. something like this:
%{DATA:php_error_type}: %{DATA:message_part1}%{URIPATHPARAM:file_name}%{GREEDYDATA:errormsg}
%{DATA:php_error_type}: %{GREEDYDATA:errormsg}
%{DATA:message_part1}%{URIPATHPARAM:file_name}%{GREEDYDATA:errormsg}
But somehow I am finding it very difficult to make it work for the entire log file.
Any suggestion please? Also, not sure if there would be any other type of error messages coming in the log file. but the intention is to get the same format for all. Any suggestions how to tackle these logs to get the above mentioned format?
The grok filter can be configured with multiple patterns:
grok {
match => [
"message", "%{DATA:php_error_type}: %{DATA:message_part1}%{URIPATHPARAM:file_name}%{GREEDYDATA:errormsg}",
"message", "%{DATA:php_error_type}: %{GREEDYDATA:errormsg}",
"message", "%{DATA:message_part1}%{URIPATHPARAM:file_name}%{GREEDYDATA:errormsg}"
]
}
(Instead of a single filter with multiple patterns you could have multiple grok filters, but then you'd probably want to disable the _grokparsefailure tagging with tag_on_failure => [].)
If you have some part of your log line missing sometime you can use the following syntax :
(?:%{PATTERN1}|%{PATTERN2})
or
(?:%{PATTERN1}|)
To allow PATTERN1 OR ''. (empty)
Using this, you can have have only one pattern to manage :
grok {
match => [
"message", "(?:%{DATA:php_error_type}: |)(?:%{DATA:message_part1}:)(?:%{URIPATHPARAM:file_name}|)%{GREEDYDATA:errormsg}",
]
}
If you have problems, maybe replace %{DATA} by a more restrictive pattern.
You can also use this syntax (more regex like)
(?:%{PATTERN1})?
To debug a complex grok pattern, I recommend :
https://grokconstructor.appspot.com/do/match (multiline option + multiple input lines at same time + others options)
https://grokdebug.herokuapp.com/ (simpler to use)