Splunk® Enterprise

Managing Indexers and Clusters of Indexers

Splunk Enterprise version 7.0 is no longer supported as of October 23, 2019. See the Splunk Software Support Policy for details. For information about upgrading to a supported version, see How to upgrade Splunk Enterprise.
This documentation does not apply to the most recent version of Splunk® Enterprise. For documentation on the most recent version, go to the latest release.

Configure the master with the CLI

Read this first

Before reading this topic, see:

Enable the master node

The following example shows the basic settings that you typically configure when enabling a master node. The configuration attributes correspond to fields on the Enable clustering page of Splunk Web. 

splunk edit cluster-config -mode master -replication_factor 4 -search_factor 3 -secret your_key -cluster_label cluster1

splunk restart

The -secret flag modifies the pass4SymmKey setting in the [clustering] stanza of server.conf.

When the master starts up for the first time, it will block indexing on the peers until you enable and restart the full replication factor number of peers. Do not restart the master while it is waiting for the peers to join the cluster. If you do, you will need to restart the peers a second time.

Edit the master settings

You can also use the CLI to edit the configuration later. Use the splunk edit cluster-config command, the same command used to enable the master initially.

Refer to the CLI clustering help, along with the server.conf specification file, for the list of configurable settings.

Warning: Do not increase the replication factor or search factor on the master

Although it is possible to change the settings for the replication factor and search factor, it is inadvisable to increase either of them after your cluster contains significant amounts of data. Doing so will kick off a great deal of bucket activity, which will have an adverse effect on the cluster's performance while bucket copies are being created or made searchable.

Last modified on 15 September, 2020
Configure the master with server.conf   Replace the master node on the indexer cluster

This documentation applies to the following versions of Splunk® Enterprise: 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.7, 7.0.8, 7.0.9, 7.0.10, 7.0.11, 7.0.13, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.7, 7.1.8, 7.1.9, 7.1.10, 7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6, 7.2.7, 7.2.8, 7.2.9, 7.2.10, 7.3.0, 7.3.1, 7.3.2, 7.3.3, 7.3.4, 7.3.5, 7.3.6, 7.3.7, 7.3.8, 7.3.9, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.7, 8.0.8, 8.0.9, 8.0.10

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