Impact of removing 'captain_uri' in Search Head Clustering

Applicability

Description

The current status of the search head cluster can be checked using the command - 

./splunk show shcluster-status

However, some servers have a "captain_uri" configuration, suggesting that the user may have previously made adjustments to set their search head cluster to static. 

captain_uri = [ static-captain-URI ]
* The management URI of static captain is used to identify the cluster captain for a static captain.

 So, the user wants to know if removing the "captain_uri" configuration from all search head members is advisable or if it could cause any issues. 

Resolution

1) Removing the captain_uri configuration on all search head members in a Search Head Cluster (SHC) where the cluster captain selection mode is already set to dynamic should generally not pose a problem.

2) In dynamic mode, the cluster captain is automatically selected based on the health and availability of the cluster members. This selection happens dynamically based on a set of factors, like load balancing and member status.

3) If the user is already in dynamic mode, the captain_uri setting (which points to a static captain) is essentially being ignored, because dynamic captain selection takes precedence.

4) The captain_uri configuration is used in static captain mode to manually specify which search head should be the captain. If captain_uri configuration is specified, it overrides the dynamic captain election.

5) If the cluster is currently operating with dynamic captain selection, the presence of the captain_uri setting might be redundant and unnecessary.

6) If the cluster is indeed in dynamic captain selection mode, removing the captain_uri setting from the configuration files on the search head members will not cause issues.

7) No Static Captain: If the configuration is removed, the cluster will simply revert fully to dynamic captain election, which is already in effect.

-Removing the captain_uri configuration should not be a problem if the cluster is already using dynamic captain selection. It will simply ensure that the cluster continues to use dynamic selection without any static overrides. Just ensure to monitor the cluster after making the change to verify everything functions as expected.

Related Links

SHC Status