Difference between revisions of "Splunk"

From Nuclear Physics Group Documentation Pages
Jump to navigationJump to search
 
(19 intermediate revisions by 2 users not shown)
Line 1: Line 1:
 
Splunk is a flexible data aggregation system.  In laymens' words, Splunk is a system that combs through log files (and anything else that contains structured information that you want to throw at it) and presents the results in a summarized format. It is really a pretty neat thing. See the [http://www.splunk.com splunk website].
 
Splunk is a flexible data aggregation system.  In laymens' words, Splunk is a system that combs through log files (and anything else that contains structured information that you want to throw at it) and presents the results in a summarized format. It is really a pretty neat thing. See the [http://www.splunk.com splunk website].
−
== Splunk at UNH ==
+
 
−
We are running the free 3.0beta3 on our system [[Jalapeno]]. Splunk is resource hungry. It requires at least 600MB of memory and quite a bit of CPU. Although it is possible to run a splunkd server deamon on each node and have these pass the information to the master node, this is '''not''' how I chose to set it up. Our splunbk setup is as follows:
+
== Splunk at NPG ==
−
* Splunk runs on [[Jalapeno]]. It is installed in /data/splunk, with a link to /opt/splunk.
+
 
−
* Jalapeno mounts the /var/log directories from einstein and roentgen so that it can be accessed by splunk for aggregation.
+
At NPG we have the following setup:
−
* The free version of splunk does not allow for login. We should restrict access to jalapeno to sysadmins.
+
 
−
* This can be extended to do many different tasks!
+
Taro  = Splunk indexer, splunk deployment server, splunk web server
−
== Connecting to Splunk ==
+
 
−
jalapeno isn't an HTTP server, so it's not possible to access the interface to Splunk by simply opening a web browser and going to the appropriate port. There is a fairly simple workaround, though:
+
Endeavour, Gourd, Einstein, Roentgen, Lentil, ... = Splunk forwarding servers.
−
# <code>ssh -L8001:localhost:8000 jalapeno</code>. It doesn't necessarily have to be 8001, but some available port on your machine.
+
 
−
# Open a web browser with good Javascript support (and optionally Flash, for some fancy graphing features), and go to ''localhost:8001'' (or whatever port you chose)
+
So, the other systems all forward their data to Taro, where it is indexed. The instructions of what to do by these forwarding hosts is also provided by Taro (deployment server).
 +
Additional indexing of data can be implemented by adding data to the deployment class on Taro. You can also add data directly on the node by editing the config files.
 +
 
 +
Note: This means that even if you start the web interface on one of the other nodes, you won't see anything, since all the data was send to Taro.
 +
 
 +
== Splunk 6.2.x ==
 +
 
 +
We are currently using Splunk version 6.2.2, which will be upgraded only as needed.
 +
 
 +
== Accessing Splunk ==
 +
 
 +
The splunk web interface is available via port 8000 on Taro. This port is not open on the firewall so an ssh port forward should be used to access it. To do so use the following command:
 +
 
 +
ssh -L 8001:localhost:8000 username@pumpkin
 +
 
 +
Then direct your browser to https://localhost:8001  (you can change the 8001 to anything you want on both commands.)
 +
 
 +
IF we are still using an "enterprise" license, you will be asked to enter a user name and password. Try "admin" and "changeme" or "splunkitnow"
 +
 
 +
== Using Splunk ==
 +
 
 +
A good place to start when using splunk is the "search". There are saved searches, which allow you to start exploring. Some of the saved searches are exported as dashboard apps.  
 +
 
 +
Click on "Dashboards" in the green bar on the top. Then choose a dashboard (i.e. "Errors last 24h") and click the title. The resulting bar graph shows the errors color coded by machine. You can now click on the colored bars to explore what these errors were and then '''take action'''.
 +
 
 +
== Installing Splunk ==
 +
 
 +
This is changing with every release, fortunately it get easier.
 +
 
 +
On Taro, Splunk is installed on /data/splunk/splunk-xxx  with a link to the latest version. Taro also hosts the tar file.
 +
 
 +
 
 +
=== Adding Forwarders ===
 +
 
 +
The process for installing a forwarder is pretty simple. Forwarders don't have a web interface, we turn it off, so use the following commands:
 +
 
 +
# cd /opt        # (or /data for systems with a data drive)
 +
# mkdir splunk
 +
# cd splunk
 +
# tar xzvf /net/data/taro/splunk/splunk-xxxx.tgx
 +
# cd splunk
 +
# bin/splunk start  ## (agree to license)
 +
# bin/splunk edit user admin -password splunkitnow -role admin -auth admin:changeme
 +
# bin/splunk set deploy-poll 10.0.0.247:8089  ## (set deployment server as Taro)
 +
# bin/splunk enable boot-start
 +
# bin/splunk disable webserver
 +
# bin/splunk restart
 +
 
 +
That's all folks.
 +
 
 +
== Documentation ==
 +
 
 +
These links are useful references when setting up Splunk.
 +
 
 +
[http://www.splunk.com/download/ Download Splunk]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/latest/Updating/Extendedexampledeployseveralstandardforwarders Example Deployment server]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/6.2.3/Updating/Configuredeploymentclients  Configure Deployment Clients (CLI examples)]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/latest/Installation/InstallonLinux Install on Linux]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/4.3/Deploy/Deployanixdfmanually Deploy *nix Universal Forwarder]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/latest/Admin/Changedefaultvalues#Changing_the_admin_default_password Change Admin pw from command line]
 +
 
 +
[http://docs.splunk.com/Documentation/Splunk/latest/Data/MonitorfilesanddirectoriesusingtheCLI Add files to monitor from command line]

Latest revision as of 14:30, 14 May 2015

Splunk is a flexible data aggregation system. In laymens' words, Splunk is a system that combs through log files (and anything else that contains structured information that you want to throw at it) and presents the results in a summarized format. It is really a pretty neat thing. See the splunk website.

Splunk at NPG

At NPG we have the following setup:

Taro = Splunk indexer, splunk deployment server, splunk web server

Endeavour, Gourd, Einstein, Roentgen, Lentil, ... = Splunk forwarding servers.

So, the other systems all forward their data to Taro, where it is indexed. The instructions of what to do by these forwarding hosts is also provided by Taro (deployment server). Additional indexing of data can be implemented by adding data to the deployment class on Taro. You can also add data directly on the node by editing the config files.

Note: This means that even if you start the web interface on one of the other nodes, you won't see anything, since all the data was send to Taro.

Splunk 6.2.x

We are currently using Splunk version 6.2.2, which will be upgraded only as needed.

Accessing Splunk

The splunk web interface is available via port 8000 on Taro. This port is not open on the firewall so an ssh port forward should be used to access it. To do so use the following command: 

ssh -L 8001:localhost:8000 username@pumpkin

Then direct your browser to https://localhost:8001 (you can change the 8001 to anything you want on both commands.)

IF we are still using an "enterprise" license, you will be asked to enter a user name and password. Try "admin" and "changeme" or "splunkitnow"

Using Splunk

A good place to start when using splunk is the "search". There are saved searches, which allow you to start exploring. Some of the saved searches are exported as dashboard apps.

Click on "Dashboards" in the green bar on the top. Then choose a dashboard (i.e. "Errors last 24h") and click the title. The resulting bar graph shows the errors color coded by machine. You can now click on the colored bars to explore what these errors were and then take action.

Installing Splunk

This is changing with every release, fortunately it get easier.

On Taro, Splunk is installed on /data/splunk/splunk-xxx with a link to the latest version. Taro also hosts the tar file.


Adding Forwarders

The process for installing a forwarder is pretty simple. Forwarders don't have a web interface, we turn it off, so use the following commands:

  1. cd /opt # (or /data for systems with a data drive)
  2. mkdir splunk
  3. cd splunk
  4. tar xzvf /net/data/taro/splunk/splunk-xxxx.tgx
  5. cd splunk
  6. bin/splunk start ## (agree to license)
  7. bin/splunk edit user admin -password splunkitnow -role admin -auth admin:changeme
  8. bin/splunk set deploy-poll 10.0.0.247:8089 ## (set deployment server as Taro)
  9. bin/splunk enable boot-start
  10. bin/splunk disable webserver
  11. bin/splunk restart

That's all folks.

Documentation

These links are useful references when setting up Splunk.

Download Splunk

Example Deployment server

Configure Deployment Clients (CLI examples)

Install on Linux

Deploy *nix Universal Forwarder

Change Admin pw from command line

Add files to monitor from command line

Retrieved from "https://nuclear.unh.edu/wiki/index.php?title=Splunk&oldid=5874"