Nagios Support Forum

Posted: **Tue Oct 18, 2016 9:14 am**

mcapra wrote:There may be some rsyslog configurations to consider. From the CLI of the machine that is sending the JSON file, can you share the outputs of:
Code: Select all
ls -al /etc/rsyslog.d/
cat /etc/rsyslog.d/*.conf

Any chance I'd be able to get these outputs? rsyslog might be applying a template that is malforming the JSON.

Posted: **Tue Oct 18, 2016 11:08 am**

Code: Select all

ls -l /etc/rsyslog.d/

-rw-r--r-- 1 root root 736 Oct 18 16:02 90-nagioslogserver_var_tmp_logs_test.log.conf

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cat /etc/rsyslog.d/*.conf

$ModLoad imfile
$InputFilePollInterval 10
$PrivDropToGroup adm
$WorkDirectory /var/lib/rsyslog

# Input for import_json
$InputFileName /var/tmp/logs/test.log
$InputFileTag import_json:
$InputFileStateFile nls-state-var_tmp_logs_test.log # Must be unique for each file being polled
# Uncomment the folowing line to override the default severity for messages
# from this file.
#$InputFileSeverity info
$InputFilePersistStateInterval 20000
$InputRunFileMonitor

# Forward to Nagios Log Server and then discard, otherwise these messages
# will end up in the syslog file (/var/log/messages) unless there are other
# overriding rules.
if $programname == 'import_json' then @@dev444.dev.e2open.com:2057
if $programname == 'import_json' then ~

Posted: **Tue Oct 18, 2016 3:57 pm**

It definitely looks like the default rsyslog configuration template is messing up the JSON. I have this received as a message:

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<133>Oct 18 15:55:19 localhost import_json: {"Var1":"Foo","Var2":"Bar","Var3":"Alpha","Var4":"Beta"}

Which tells me that what is likely happening is that the generic rsyslog template is adding the date, host, and programname to the beginning of our json. That's less than ideal, so we'll need to alter the specific file's configuration to remove those parts from our message. I'm working on a few possible solutions for this; Stay tuned

Posted: **Tue Oct 18, 2016 4:40 pm**

Two possible solutions: modify the logstash input, or remove the default template from the rsyslog configuration.

remove the template from the rsyslog configuration

The simpler solution of the two for sure. Modify your rsyslog config (90-nagioslogserver_var_tmp_logs_test.log.conf) to include a template for the messages and apply that template to your output. This involves two changes:

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# create the template, just take the raw message with no additional info
$template cleanJson,"%rawmsg%"

...

# apply the template to your output
if $programname == 'import_json' then @@192.168.67.4:2057;cleanJson

I have modified your provided configuration file accordingly:

Code: Select all

$ModLoad imfile
$InputFilePollInterval 10
$PrivDropToGroup adm
$WorkDirectory /var/lib/rsyslog

# Input for import_json
$InputFileName /var/tmp/logs/test.log
$InputFileTag import_json:
$InputFileStateFile nls-state-var_tmp_logs_test.log # Must be unique for each file being polled
# Uncomment the folowing line to override the default severity for messages
# from this file.
#$InputFileSeverity info
$InputFilePersistStateInterval 20000
$InputRunFileMonitor

# template to send raw message by itself 
$template cleanJson,"%rawmsg%"

# Forward to Nagios Log Server and then discard, otherwise these messages
# will end up in the syslog file (/var/log/messages) unless there are other
# overriding rules.
if $programname == 'import_json' then @@dev444.dev.e2open.com:2057;cleanJson
if $programname == 'import_json' then ~

Be sure to do a service rsyslog restart when modifying your rsyslog configurations. Applying this produced the following events moving forward:

2016_10_18_16_43_15_Dashboard_Nagios_Log_Server.png

modify the logstash input

This solution is pretty hacky and definitely the less ideal solution, but I am providing it in the event that the first solution doesn't work.

I used the following input rule as a replacement for "Import Files - JSON (Default)":

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tcp {
    type => 'import_json'
    tags => 'import_json'
    port => 2057
}

Then crafted a filter to sanitize the message and parse it as JSON:

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if [type] == 'import_json' {
	mutate {
		gsub => [
		  # remove everything before first JSON bracket
		  "message", "^[^{]*{", "{"
		]
	  }
	  json {
          source => "message"
        }
}

Which produced the following event:

2016_10_18_16_29_16_Dashboard_Nagios_Log_Server.png

Posted: **Wed Oct 19, 2016 3:43 pm**

I will try these options in a day or two and let you know the results.

Posted: **Wed Oct 19, 2016 3:56 pm**

Sounds good. Let us know any updates!

Posted: **Thu Oct 20, 2016 2:09 pm**

Both options worked for me. Only drawback with option 1 is that I can't see the original message in the dashboard.

Thanks for your help.

Posted: **Thu Oct 20, 2016 2:14 pm**

You are very welcome. Is it ok if we lock this thread?

Posted: **Thu Oct 20, 2016 2:46 pm**

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