I have defined my pattern in the patterns file and reading them from my logstash module as the below block
grok {
patterns_dir => "../patterns/cisco-ftd"
match => [ "message", "%{CISCOFW302013_302014_302015_302016}",
"message", "%{CISCOFW302020_302021}",
"message", "%{CISCOFTD607001}"
]
tag_on_failure => [ "_grokparsefailure" ]
}
While the first two patterns get recognized, the third one CISCOFTD607001 doesn't get recognized and the output log gives the below error.
exception=>#<Grok::PatternError: pattern %{CISCOFTD607001} not defined>
I'm guessing there is something wrong with my parser but sure.
Here is the message and the corresponding parser
Here is my pattern %FTD-%{POSINT:[event][severity]}-%{POSINT:[syslog][id]}: %{DATA}:%{IP:[source][ip]}/%{NUMBER:[source][port]} to %{DATA}:%{IP:[destination][ip]} %{GREEDYDATA}
Answering my question.
It worked well when I changed patterns_dir => "../patterns/cisco-ftd" to absolute path.
Related
I am very new to Logstash and ELK in general.
I need to write a grok pattern for a log file in the following format :
[191114|16:51:13.577|BPDM|MDS|2|209|ERROR|39999]Interrupted by a signal!!!
I tried to write a grok pattern by referring grok-patterns and by trying out my implementation in grok-debugger, but it didn't work.
grok {
match => { "message" => "%{NONNEGINT:fixed}|%{HOSTNAME:host}|%{WORD:word1}|%{WORD:word2}|%{NONNEGINT:num1}|%{NONNEGINT:num2}|%{ERROR|INFO|EVENT}|%{NONNEGINT:num1}|%{GREEDYDATA:message}" }
}
You need to escape the brackets and the pipes, and your second field is not a host, it is a time.
This one works, just validate the field names.
\[%{NONNEGINT:fixed}\|%{DATA:time}\|%{WORD:word1}\|%{WORD:word2}\|%{NONNEGINT:num1}\|%{NONNEGINT:num2}\|%{WORD:loglevel}\|%{NONNEGINT:num3}\]%{GREEDYDATA:message}
This grok will parse your message like this.
{
"word1": "BPDM",
"word2": "MDS",
"message": "Interrupted by a signal!!!",
"loglevel": "ERROR",
"num1": "2",
"fixed": "191114",
"time": "16:51:13.577",
"num3": "39999",
"num2": "209"
}
I am facing issue while using the Grok filter. Below is my filter which is working as expected while the class name do not have $ in it. When thread name is like PropertiesReader$ it is failing. What else can I use so it can parse class name with special characters ?
filter {
grok {
match => [ "message", "%{TIMESTAMP_ISO8601:LogDate} %{LOGLEVEL:loglevel} %{WORD:threadName}:%{NUMBER:ThreadID} - %{GREEDYDATA:Line}" ]
}
json {
source => "Line"
}
mutate {
remove_field => [ "Line" ]
}
}
You aren't limited to grok pattern names. You can do any regex. For example in place of %{WORD:threadName} you can put (?<threadName>[^:]+) which says to match any character that isn't a : and assign it to threadName.
You are using WORD as a pattern for your threadname which does not contain special characters. To confirm this let's take a look at this pattern: WORD \b\w+\b
Use a custom pattern. Just descibe it in a file like this:
MYPATTERN ([A-z]+\$?)
Then you can use it in your config like this:
grok {
patterns_dir => ["/path/to/pattern/dor"]
match => [ "message", "%{TIMESTAMP_ISO8601:LogDate} %LOGLEVEL:loglevel} %{MYPATTERN:threadName}:%{NUMBER:ThreadID} - %GREEDYDATA:Line}" ]
}
You'll find more information about custom patterns in the docs
You could also try with %{DATA:threadName} instead of %{WORD:threadName}, if your threadName won't contain whitespaces or colons.
I have a grok match like this:
grok{ match => [ “message”, “Duration: %{NUMBER:duration}”, “Speed: %{NUMBER:speed}” ] }
I also want to add another field to captured variables if it matches a grok pattern. I know I can use mutate plugin and if-else to add new fields but I have too many matches and it will be too long that way. As an example, I want to capture right-side fields for given texts.
"Duration: 12" => [duration: "12", type: "duration_type"]
"Speed: 12" => [speed: "12", type: "speed_type"]
Is there a way to do this?
I am not 100% sure if that is what you need, but I did something similar. I have a basic parsing for my message, and then I analyse a specific field additionally with optional matches.
grok {
break_on_match => false
patterns_dir => "/etc/logstash/conf.d/patterns"
match => {
"message" => "\[%{LOGLEVEL:level}\] \[%{IPORHOST:from}\] %{TIMESTAMP_ISO8601:timestamp} \[%{DATA:thread}\] \[%{NOTSPACE:logger}\] %{GREEDYDATA:msg}"
"thread" => "(%{GREEDYDATA}%{REQUEST_TYPE:reqType}%{SPACE}%{URIPATH:reqPath}(%{URIPARAM:reqParam})?)?"
}
}
As you can see, the first one simply matches the complete message. I have a field thread, that is basically the Logger information. However, in my setup, http requests append some info to the thread name. In these cases, I want to OPTIONALLY match these as well.
Wit the above setup, the fields reqType, reqPath, reqParam are only created, if thread can match them. Otherwise they aren't.
I hope this is what you wanted.
Thanks,
Artur
Something like this?
filter{
grok { match => [ "message", "%{GREEDYDATA:types}: %{NUMBER:value}" ] }
mutate {
lowercase => [ "types" ]
add_field => { "%{types}" => "%{value}"
"type" => "%{types}_type" }
remove_field => [ "value", "types" ]
}
}
I am running the following filter in a logstash config file:
filter {
if [type] == "logstash" {
grok {
match => {
"message" => [
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{DATA:mymessage}, reason:%{GREEDYDATA:reason}",
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{GREEDYDATA:mymessage}"
]
}
}
}
}
It kind of works:
it does identify and carve out variables "timestamp", "severity", "instance", "mymessage", and "reason"
Really what I wanted was to have text which is now %{mymessage} to be the ${message} but when I add any sort of mutate command to this grok it stops working (btw, should there be a log that tells me what is breaking? I didn't see it... ironic for a logging solution to not have verbose logging).
Here's what I tried:
filter {
if [type] == "logstash" {
grok {
match => {
"message" => [
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{DATA:mymessage}, reason:%{GREEDYDATA:reason}",
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{GREEDYDATA:mymessage}"
]
}
mutate => {
replace => [ "message", "%{mymessage}"]
remove => [ "mymessage" ]
}
}
}
}
So in summary I'd like to understand:
Are there log files I can look at to see why/where a failure is happening?
Why would my mutate commands illustated above not work?
I also thought that if I never used the mymessage variable but instead just referred to message as the variable that maybe it would automatically truncate message to just the matched pattern but that appeared to append the results instead ... what is the correct behaviour?
Using the overwrite option is the best solution, but I thought I'd address a couple of your questions directly anyway.
It depends on how Logstash is started. Normally you'd run it via an init script that passes the -l or --log option. /var/log/logstash would be typical.
mutate is a filter of its own, not a part of grok. You could've done like this (or used rename instead of replace + remove):
grok {
...
}
mutate {
replace => [ "message", "%{mymessage}" ]
remove => [ "mymessage" ]
}
I'd do it a different way. For what you're trying to do, the overwrite option might be more apt.
Something like this:
grok {
overwrite => "message"
match => [
"message" => [
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{DATA:message}, reason:%{GREEDYDATA:reason}",
"\[%{DATA:timestamp}\]\[%{DATA:severity}\]\[%{DATA:instance}\]%{GREEDYDATA:message}"
]
]
}
This'll replace 'message' with the 'grokked' bit.
I know that doesn't directly answer your question - about all I can say is when you start logstash, it writes to STDOUT - at least on the version I'm using - which I'm capturing and writing to a file. In here, it reports some of the errors.
There's a -l option to logstash that lets you specify a log file to use - this will usually show you what's going on in the parser, but bear in mind that if something doesn't match a rule, it won't necessarily tell you why it didn't.
I'm stuck. I cannot get why grok fails to match a simple regex under logstash.
grok works just fine as a standalone thing.
The only pattern which works for me is ".*" everything else just fails.
$ cat ./sample2-logstash.conf
input {
stdin {}
}
filter {
grok {
match => [ "message1", "foo.*" ]
add_tag => [ "this_is_foo" ]
tag_on_failure => [ "STUPID_LOGSTASH" ]
}
}
output {
stdout { codec => json_lines }
}
Here's the output:
$ echo "foo" |~/bin/logstash-1.4.0/bin/logstash -f ./sample2-logstash.conf
{"message":"foo","#version":"1","#timestamp":"2014-05-07T00:32:49.915Z","host":"serega-sv","tags":["STUPID_LOGSTASH"]}
Looks like I missed to do something in logstash because vanilla grok works just fine:
$ cat grok.conf
program {
file "./sample.log"
match {
pattern: "foo.*"
reaction: "LINE MATCHED! %{#LINE}"
}
}
Plain grok's output:
$ echo "foo" > ./sample.log; grok -f grok.conf
LINE MATCHED! foo
Thanks!
You configuration have error. The grok match field is message, instead of message1.
Then, at logstash grok page there is an example to show how to use grok. I think you have misunderstand. For example, if your log is
55.3.244.1 GET /index.html 15824 0.043
The grok pattern for logstash is
%{IP:client} %{WORD:method} %{URIPATHPARAM:request} %{NUMBER:bytes} %{NUMBER:duration}
For %{IP:client}, The first parameter (IP) is grok pattern, the second parameter(client) is the field you want to put this message.
Everything #Ben Lim said. The very next section of the documentation shows how to apply semantics to generic regex syntax:
filter {
grok {
match => [ "message",
"^(?<ip>\S+) (?<verb>\S+) (?<request>\S+) (?<bytes>\S+) (?<delay>\S+)$"
]
}
}