Related to:

When running the API to retrieve perfdata values, you may encounter the error 'DS does not exist'

Problem

The following can be seen if the API endpoint is run on a web browser:

The same error will appear if the API request is done through the CLI.

Possible Cause(s)

Root Cause 1: DS is not specified in the API endpoint.

Root Cause 2: RRD Storage Type setting for perfdata is set to SINGLE.

Possible Solution(s)

Solution Root Cause 1: Double-check that the endpoint you are using has the DS specified.

The endpoint should look like this:

https://op5-host/api/beta/perfdata/fetch/?format=json&host=HOSTNAME&service=SERVICENAME&ds=rta

The ds= part corresponds to the label of the datasource from the corresponding object's .XML definition. You can locate the .XML file in the following path: /opt/monitor/op5/pnp/perfdata/HOSTNAME

The .XML file will be labeled with the SERVICENAME. For example, for host GOMBURZA-loro and service PING, the path is then:

/opt/monitor/op5/pnp/perfdata/GOMBURZA-loro

You can then locate the correspnding .XML file by the service name:

# ls -l PING*
-rw-rw-r--  1 monitor apache   3883 May 10 13:33 PING.xml
-rw-rw-r--. 1 monitor apache 384952 May 10 13:44 PING_pl.rrd
-rw-rw-r--. 1 monitor apache 384952 May 10 13:44 PING_rta.rrd
-rw-rw-r--. 1 monitor apache 384952 May 10 13:44 PING_rtmax.rrd
-rw-rw-r--. 1 monitor apache 384952 May 10 13:44 PING_rtmin.rrd

Inspecting PING.xml will give you the name/s of the available datasources:

# cat PING.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<NAGIOS>
  <DATASOURCE>
    <TEMPLATE>check_ping</TEMPLATE>
    <RRDFILE>/opt/monitor/op5/pnp/perfdata/GOMBURZA-loro/PING_rta.rrd</RRDFILE>
    <RRD_STORAGE_TYPE>MULTIPLE</RRD_STORAGE_TYPE>
    <RRD_HEARTBEAT>8460</RRD_HEARTBEAT>
    <IS_MULTI>0</IS_MULTI>
    <DS>1</DS>
    <NAME>rta</NAME>                                         <<<<<<<<<<---------- This is the datasource nam
    <LABEL>rta</LABEL>

Solution Root Cause 2: Change RRD Storage Type to use MULTIPLE instead of SINGLE

Run the command below to check what the RRD_STORAGE_TYPE is. 

grep RRD_STORAGE_TYPE /opt/monitor/etc/pnp/process_perfdata.cfg

To be able to use the api to fetch perfdata you need to have RRD_STORAGE_TYPE = MULTIPLE.

However, if you just change it you will lose all your graph history.

We have a tool for converting though. If this is something you want to do, follow the instructions below. It is recommended to make a backup first.

# yum clean all
# yum --enablerepo=op5-community install op5-support-modules\*
# mon sysconf rrd-storage-convert

Note that when the conversion is initiated, npcd service is stopped. rrdcached is flushed and stopped.

Related Articles

• Any existing FAQ / external website

If Issue Persists

• Please contact with our Client Services team via the chat service box available in any of our websites or via email to support@itrsgroup.com
  
  
  
• Make sure you provide to us:

- ANY LOG FILE OR DIAGNOSTIC

- ANY SCREENSHOT

- ANY VENDOR/VERSION OF WHAT THEY ARE TRYING TO CONNECT TO

-Any troubleshooting step already verified from the ones described in this article.