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Analytics for Linux

Splunk AppInspect Passed
Overview
Details
Analytics for Linux helps you quickly and easily analyse system and application performance metrics in Splunk.

Just configure collectd on your Linux servers to push metrics to your Splunk HTTP Event Collector and into a metrics index.

All dashboards in the app utilize the mstats command to query the Metrics Store (new to Splunk Enterprise 7.x) which enables massive performance improvements, i.e. 200 - 2000x faster queries.

Dashboards include graphs of CPU, Memory, Swap, Load, Disk Usage, Processes, Network Interface Utilization, Network Latency (Ping), and nginx & Apache web servers.

Custom Visualization prerequisites:
Horizon Chart: https://splunkbase.splunk.com/app/3117/
Horseshoe Meter: https://splunkbase.splunk.com/app/3166/

Feedback welcome :)

Setup

Configure your collectd agents to send metrics using the "write_http" plugin to a Splunk HTTP Event Collector with the built-in sourcetype called “collectd_http”

i.e. “Analytics for Linux” doesn’t require a separate Splunk Technology Add-on (TA) for ingestion of metrics.

Create a new 'metric' index

e.g. collectd:

indexes.conf :-

[collectd]
datatype   = metric
homePath   = $SPLUNK_DB/collectd/db
coldPath   = $SPLUNK_DB/collectd/colddb
thawedPath = $SPLUNK_DB/collectd/thaweddb

Add a new HTTP Event Collector token

e.g. replace hec_token below:

inputs.conf :-

[http://Collectd]
token=hec_token
disabled=0
index=collectd
source=collectd token
sourcetype=collectd_http

Install and configure collectd

an example configuration file has been included in this app:
i.e. $SPLUNK_HOME/etc/apps/sh_collectd/examples/collectd.conf

Note: You must replace splunk_server & hec_token in the Node definition, e.g.

<Plugin write_http>
<Node "node1">
URL "https://splunk_server:8088/services/collector/raw"
Header "Authorization: Splunk hec_token"
Format "JSON"
VerifyPeer false
VerifyHost false
Metrics true
StoreRates true
</Node>
</Plugin>

Start Collectd

/etc/init.d/collectd start

Dashboards

  • Overview
  • Load
  • CPU Overview
  • CPU Detail (overall and per core)
  • Memory Usage (used, cached, buffered, swapped, free memory)
  • Storage Trending (in-/decrease per host and per partition)
  • Storage Timeline (Host and Partition usage over time)
  • Storage Performance (IOPs, Latency, Volume) by Host and Partition
  • Process State (running, sleeping, blocked and zombie processes) over time
  • Network Throughput and Errors (Packets/s) by Host and Interface
  • Ping (Network Latency)
  • Metrics Comparison with Horizon Chart - compare two or more hosts
  • Metrics Explorer (inspired by the Metrics Explorer for Splunk app)
  • Metrics Navigator - dynamically display multiple charts of metrics
  • nginx Usage
  • Apache Usage

Contact

Developer: Luke Harris (Data Analytics Practice Lead at Katana1)
Web: https://katana1.com
Twitter: https://twitter.com/skywalka

Blog

https://www.datagods.com.au/news/splunk-metrics-ftw

Stop, Collaborate, and Listen

Issues & Pull Requests are welcome :)
https://bitbucket.org/katana1/analyticsforlinux

Collectd Compatibility

This app has been tested with the following versions of collectd:
Ubuntu: collectd 5.6.3.2, 5.7.2.52, & 5.8.0.19
RHEL 7: collectd 5.8.0-1
CentOS 7: collectd 5.7.1-2
Amazon Linux: collectd 5.7.1-3.19
Mac OS X: collectd 5.8.0

Note: collectd version 5.6 or higher is required.

Splunk Compatibility

Minimum Version 7.x

Splunk Documentation for Collectd

http://docs.splunk.com/Documentation/Splunk/latest/Metrics/GetMetricsInCollectd

Splunk ebook - The Beginner's Guide to Collectd

https://www.splunk.com/blog/2018/02/15/collectd-great-infrastructure-performance-metrics-but-where-do-i-begin.html

Troubleshooting

1/ Run the following search to confirm that metrics are being indexed :-

|  mcatalog values(metric_name)

2/ Add the collectd index to "Indexes searched by default" :-

https://docs.splunk.com/Documentation/Splunk/latest/Search/Searchindexes#Control_index_access_using_Splunk_Web

3/ Ensure that the sourcetype is set to "collectd_http" :-

Example error in splunkd.log:

WARN  IndexProcessor - Index Processor: Metric value=unset is not valid for source=collectd_linux, sourcetype=hec, host=foo, index=collectd. Metric event data with an invalid metric value would not be indexed. Ensure the input metric data is not malformed.

4/ Ensure that collectd can connect to the network using TCP by turning on the "collectd_tcp_network_connect" boolean for SELinux which is disabled by default :-

Example error in /var/log/messages or /var/log/syslog:

write_http plugin: curl_easy_perform failed with status 7: Failed to connect to 10.11.22.33: Permission denied

Fix:

# setsebool -P collectd_tcp_network_connect 1

Thank You

This app was inspired by the 'Collectd App for Splunk Enterprise' by Nexinto GmbH

Release Notes

Version 3.3.0
Jan. 12, 2018

Added Overview dashboard, Added CPU Overview dashboard, Fixed Bugs in Storage Trends dashboard, & Added Ping dashboard

Version 3.2.1
Jan. 11, 2018

Added a host multi-select dropdown to the Overview and CPU Overview dashboards

Version 3.2.0
Jan. 9, 2018

Added Overview dashboard, Added CPU Overview dashboard, & Fixed Bugs in Storage Trends dashboard

Version 3.1.0
Nov. 27, 2017

Updated Storage Performance chart with per host metrics, Added Index dropdown to Metrics dashboards, & Updated CPU Usage dashboard with Cores dropdown

Version 3.0.1
Nov. 20, 2017

Updated configs in readiness for app certification

Version 3.0.0
Nov. 15, 2017

New dashboards for nginx & Apache web servers

Version 2.2.0
Nov. 9, 2017

Added the Metrics Navigator dashboard to dynamically display multiple charts of metrics

Version 2.1.0
Nov. 8, 2017

Added new dashboards to explore and compare metrics

Version 2.0.1
Nov. 2, 2017

Version 2.0.1 - Removed erroneous configs

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