I have a log message from my server with the format below:
{"host":"a.b.com","source_type":"ABCD"}
I have this grok pattern so far but it accepts any word in double quotation.
\A%{QUOTEDSTRING}:%{PROG}
how can I change "QUOTEDSTRING" that only check for "host"?
"host" is not at the beginning of the message all the time and it can be found in the middle of message as well.
Thanks for your help.
Since the question specified that "host" can be anywhere between in the log, you can use the following:
\{(\"%{GREEDYDATA:data_before}\",)?(\"host\":\"%{DATA:host_value}\")?(,\"%{GREEDYDATA:data_after}\")?\}
Explanation :
data_before stores the optional data before host type entry is found. You can separate it more as per your need
host : this stores the host value
data_after stores the optional data after host type entry is found. You can seaprate it more as per your need
Example :
{"host":"a.b.com","source_type":"ABCD"}
Output :
{
"data_before": [
[
null
]
],
"host_value": [
[
"a.b.com"
]
],
"data_after": [
[
"source_type":"ABCD"
]
]
}
{"host":"a.b.com"}
Output :
{
"data_before": [
[
null
]
],
"host_value": [
[
"a.b.com"
]
],
"data_after": [
[
null
]
]
}
{"source_type":"ABCD","host":"a.b.com","data_type":"ABCD"}
Output :
{
"data_before": [
[
"source_type":"ABCD"
]
],
"host_value": [
[
"a.b.com"
]
],
"data_after": [
[
"data_type":"ABCD"
]
]
}
Tip : Use the following resources to tune and test your logging patterns :
Grok Debugger
Grok Patterns Full List
how can we get just extract the sessionid number from a pattern in grok
for example
"sessionid$:999"
I am trying to use %{DATA:line} but it gets
"line": [
[
" Sessionid$:999"
]
how can just get the session number and ignore "sessionId$" in it
Thanks
Try this:
GROK pattern:
Sessionid.\s*:%{NUMBER:line}
OUTPUT:
{
"line": [
[
"999"
]
],
"BASE10NUM": [
[
"999"
]
]
}
I am using ELK(elastic search, kibana, logstash, filebeat) to collect logs. I have a log file with following lines, every line has a json, my target is to using Logstash Grok to take out of key/value pair in the json and forward it to elastic search.
2018-03-28 13:23:01 charge:{"oldbalance":5000,"managefee":0,"afterbalance":"5001","cardid":"123456789","txamt":1}
2018-03-28 13:23:01 manage:{"cuurentValue":5000,"payment":0,"newbalance":"5001","posid":"123456789","something":"new2","additionalFields":1}
I am using Grok Debugger to make regex pattern and see the result. My current regex is:
%{TIMESTAMP_ISO8601} %{SPACE} %{WORD:$:data}:{%{QUOTEDSTRING:key1}:%{BASE10NUM:value1}[,}]%{QUOTEDSTRING:key2}:%{BASE10NUM:value2}[,}]%{QUOTEDSTRING:key3}:%{QUOTEDSTRING:value3}[,}]%{QUOTEDSTRING:key4}:%{QUOTEDSTRING:value4}[,}]%{QUOTEDSTRING:key5}:%{BASE10NUM:value5}[,}]
As one could see it is hard coded since the keys in json in real log could be any word, the value could be integer, double or string, what's more, the length of the keys varies. so my solution is not acceptable. My solution result is shown as follows, just for reference. I am using Grok patterns.
My question is that trying to extract keys in json is wise or not since elastic search use json also? Second, if I try to take keys/values out of json, are there correct,concise Grok patterns?
current result of Grok patterns give following output when parsing first line in above lines.
{
"TIMESTAMP_ISO8601": [
[
"2018-03-28 13:23:01"
]
],
"YEAR": [
[
"2018"
]
],
"MONTHNUM": [
[
"03"
]
],
"MONTHDAY": [
[
"28"
]
],
"HOUR": [
[
"13",
null
]
],
"MINUTE": [
[
"23",
null
]
],
"SECOND": [
[
"01"
]
],
"ISO8601_TIMEZONE": [
[
null
]
],
"SPACE": [
[
""
]
],
"WORD": [
[
"charge"
]
],
"key1": [
[
""oldbalance""
]
],
"value1": [
[
"5000"
]
],
"key2": [
[
""managefee""
]
],
"value2": [
[
"0"
]
],
"key3": [
[
""afterbalance""
]
],
"value3": [
[
""5001""
]
],
"key4": [
[
""cardid""
]
],
"value4": [
[
""123456789""
]
],
"key5": [
[
""txamt""
]
],
"value5": [
[
"1"
]
]
}
second edit
Is it possible to use Json filter of Logstash? but in my case Json is part of line/event, not whole event is Json.
===========================================================
Third edition
I do not see updated solution functions well to parse json. My regex is as follows:
filter {
grok {
match => {
"message" => [
"%{TIMESTAMP_ISO8601}%{SPACE}%{GREEDYDATA:json_data}"
]
}
}
}
filter {
json{
source => "json_data"
target => "parsed_json"
}
}
It does not have key:value pair, instead it is msg+json string. The parsed json is not parsed.
Testing data is as below:
2018-03-28 13:23:01 manage:{"cuurentValue":5000,"payment":0,"newbalance":"5001","posid":"123456789","something":"new2","additionalFields":1}
2018-03-28 13:23:03 payment:{"cuurentValue":5001,"reload":0,"newbalance":"5002","posid":"987654321","something":"new3","additionalFields":2}
2018-03-28 13:24:07 management:{"cuurentValue":5002,"payment":0,"newbalance":"5001","posid":"123456789","something":"new2","additionalFields":1}
[2018-06-04T15:01:30,017][WARN ][logstash.filters.json ] Error parsing json {:source=>"json_data", :raw=>"manage:{\"cuurentValue\":5000,\"payment\":0,\"newbalance\":\"5001\",\"posid\":\"123456789\",\"something\":\"new2\",\"additionalFields\":1}", :exception=>#<LogStash::Json::ParserError: Unrecognized token 'manage': was expecting ('true', 'false' or 'null')
at [Source: (byte[])"manage:{"cuurentValue":5000,"payment":0,"newbalance":"5001","posid":"123456789","something":"new2","additionalFields":1}"; line: 1, column: 8]>}
[2018-06-04T15:01:30,017][WARN ][logstash.filters.json ] Error parsing json {:source=>"json_data", :raw=>"payment:{\"cuurentValue\":5001,\"reload\":0,\"newbalance\":\"5002\",\"posid\":\"987654321\",\"something\":\"new3\",\"additionalFields\":2}", :exception=>#<LogStash::Json::ParserError: Unrecognized token 'payment': was expecting ('true', 'false' or 'null')
at [Source: (byte[])"payment:{"cuurentValue":5001,"reload":0,"newbalance":"5002","posid":"987654321","something":"new3","additionalFields":2}"; line: 1, column: 9]>}
[2018-06-04T15:01:34,986][WARN ][logstash.filters.json ] Error parsing json {:source=>"json_data", :raw=>"management:{\"cuurentValue\":5002,\"payment\":0,\"newbalance\":\"5001\",\"posid\":\"123456789\",\"something\":\"new2\",\"additionalFields\":1}", :exception=>#<LogStash::Json::ParserError: Unrecognized token 'management': was expecting ('true', 'false' or 'null')
at [Source: (byte[])"management:{"cuurentValue":5002,"payment":0,"newbalance":"5001","posid":"123456789","something":"new2","additionalFields":1}"; line: 1, column: 12]>}
Please check the result:
You can use GREEDYDATA to assign entire block of json to a separate field like this,
%{TIMESTAMP_ISO8601}%{SPACE}%{GREEDYDATA:json_data}
This will create a separate file for your json data,
{
"TIMESTAMP_ISO8601": [
[
"2018-03-28 13:23:01"
]
],
"json_data": [
[
"charge:{"oldbalance":5000,"managefee":0,"afterbalance":"5001","cardid":"123456789","txamt":1}"
]
]
}
Then apply a json filter on json_data field as follows,
json{
source => "json_data"
target => "parsed_json"
}
Following log:
Jul 25 07:45:12 tst-proxy202 haproxy[1104]: 10.64.111.222:36635 [25/Jul/2016:07:45:12.479] promocloud~ promocloud/tst-service-proxy203 32/0/1/27/60 200 664 - - ---- 0/0/0/0/0 0/0 {} {} "POST /RTI HTTP/1.1"
Is parsed with ${HAPROXYHTTP} grok pattern
%{SYSLOGTIMESTAMP:syslog_timestamp} %{IPORHOST:syslog_server} %{SYSLOGPROG}: %{IP:client_ip}:%{INT:client_port} \[%{HAPROXYDATE:accept_date}\] %{NOTSPACE:frontend_name} %{NOTSPACE:backend_name}/%{NOTSPACE:server_name} %{INT:time_request}/%{INT:time_queue}/%{INT:time_backend_connect}/%{INT:time_backend_response}/%{NOTSPACE:time_duration} %{INT:http_status_code} %{NOTSPACE:bytes_read} %{DATA:captured_request_cookie} %{DATA:captured_response_cookie} %{NOTSPACE:termination_state} %{INT:actconn}/%{INT:feconn}/%{INT:beconn}/%{INT:srvconn}/%{NOTSPACE:retries} %{INT:srv_queue}/%{INT:backend_queue} (\{%{HAPROXYCAPTUREDREQUESTHEADERS}\})?( )?(\{%{HAPROXYCAPTUREDRESPONSEHEADERS}\})?( )?"(<BADREQ>|(%{WORD:http_verb} (%{URIPROTO:http_proto}://)?(?:%{USER:http_user}(?::[^#]*)?#)?(?:%{URIHOST:http_host})?(?:%{URIPATHPARAM:http_request})?( HTTP/%{NUMBER:http_version})?))?"
This works well, up to some unexpected null in the syslog_server in a HOSTNAME section
"syslog_server": [
[
"tst-proxy202"
]
],
"HOSTNAME": [
[
"tst-proxy202",
null <<<<<<<<<
]
],
"IP": [
[
null,
null
]
],
"IPV6": [
[
null,
null,
null
]
],
"IPV4": [
[
null,
"10.64.111.222",
null
]
],
I did parse this with https://grokdebug.herokuapp.com/
and the patterns IPORHOST, and the IPORHOST
https://grokdebug.herokuapp.com/patterns#
works well against the hostname
tst-proxy202
%{IPORHOST:syslog_server}
{
"syslog_server": [
[
"tst-proxy202"
]
],
"HOSTNAME": [
[
"tst-proxy202"
]
],
"IP": [
[
null
]
],
"IPV6": [
[
null
]
],
"IPV4": [
[
null
]
]
}
Any idea what might be the problem?
If I understood you correctly you are trying to get rid of that null value. Well, the null value occurs because of the last part of the HAPROXYHTTP pattern (where it says ?(?:%{URIHOST:http_host})?(?:%{URIPATHPARAM:http_request})?( HTTP/%{NUMBER:http_version})?))?"). It somehow adds an empty HOSTNAME. Luckily, this is not a serious problem and here is why:
The default options of the grok filter include named_captures_only => true (docs) and keep_empty_captures => false (docs). Try these two options in the grok debugger and your output looks pretty clean. In logstash you don't have to change anything.
If logstash misinterprets your hostname try to retrieve it from the grok values yourself (e.g. use the mutate filter):
filter {
mutate {
replace => { "HOSTNAME" => "%{syslog_server}" }
}
}
Please let me know if you have further problems.
I have the following I'm trying to parse with GROK:
Hello|STATSTIME=20-AUG-15 12.20.03.051000 PM|World
I can parse the first bunch of it with GROK like so:
match => ["message","%{WORD:FW}\|STATSTIME=%{MONTHDAY:MDAY}-%{WORD:MON}-%{INT:YY} %{INT:HH}"]
Anything further than that gives me an error. I can't figure out how to quote the : character, : does not work and %{TIME:time} does not work. I'd like to be able to get the whole thing as a timestamp, but can't get it broken up. Any ideas?
You can use this to debug grok expressions
The time format is as shown here
To parse 12.20.03.051000
%{INT:hour}.%{INT:min}.%{INT:sec}.%{INT:ms}
Output will be something like this
{
"hour": [
[
"12"
]
],
"min": [
[
"20"
]
],
"sec": [
[
"03"
]
],
"ms": [
[
"051000"
]
]
}