topic Re: Rebuild and Migrate Splunk Enterprise to another different site in Splunk Enterprise

Rebuild and Migrate Splunk Enterprise to another different site

ws — Fri, 18 Jul 2025 07:33:57 GMT

Hi,

I have saw there are many recommendations to rebuild and migrate with its existing data and configuration.

It abit confusing for me as a new Splunk user, would appreciate if there some guidance for it.

The following are the instances.

1x Search Head
3x Indexer
3x Heavy Forwarder
1x License server
1x deployment server
Current version: 9.3.2

Assuming the hostname/IP could be the same or different for the rebuild.

What is the best way to perform the rebuild and migration with it existing data and configuration?

Same hostname/IP:
- Copy the entire contents of the $SPLUNK_HOME directory from the old server to the new server
- Install all instance for the new Splunk component into new server

Different hostname/IP:
- Copy the entire contents of the $SPLUNK_HOME directory from the old server to the new server
- Install all instance for the new Splunk component into new server
- Update individual .conf of instances if using new hostname
- Update individual instances to point to their respecitive instances roles

And could i install a newer version of Splunk without going to 9.3.2 when rebuilding and migrating?

For testing purpose, I'll be trying it at one AIO instances for the rebuilding/migration due to space limitation.

Re: Rebuild and Migrate Splunk Enterprise to another different site

livehybrid — Fri, 18 Jul 2025 07:42:46 GMT

Hi @ws

For rebuilding and migrating your Splunk Enterprise setup to a new site while preserving existing data and configurations either of your mentioned paths would work. This assumes compatible OS/architecture between old and new servers. Personally I'd probably use the same version as your existing deployment for the new site and upgrade once complete, that way you're doing a migration rather than a transformation - which is less risky. It also means that there wont be any unknown config changes when copying the contents of $SPLUNK_HOME.

You may want to look at using something like rsync for copying the $SPLUNK_DB paths over from the old servers to the new ones, which might take some time depending on your data retention size/configurations. You could move the bulk of this first and then copy the config.

If you're able to keep the same hostnames etc and switch the DNS over, or retain the same IPs then this will obviously reduce a lot of additional work, otherwise you will need to go through various servers to update things like deploymentclient.conf for clients connecting to the DS etc.

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Re: Rebuild and Migrate Splunk Enterprise to another different site

isoutamo — Fri, 18 Jul 2025 08:24:19 GMT

as you have an individual servers, you could use this method https://community.splunk.com/t5/Installation/How-to-migrate-indexes-to-new-indexer-instance/m-p/528064/highlight/true

When you have several indexers you should consider to migrate into clustered environment. You should read this https://docs.splunk.com/Documentation/SVA/current/Architectures/TopologyGuidance

r. Ismo

Re: Rebuild and Migrate Splunk Enterprise to another different site

ws — Tue, 22 Jul 2025 06:20:14 GMT

Hi @isoutamo,

Thanks for providing some of the article.

For All-in-One, tested with using the rsync. Everything went quite smooth.

But in a situation whereby there's a cluster involved for the indexer/search head and it is in a separate network/location. Will the same method work?? or there's another method to follow?

Re: Rebuild and Migrate Splunk Enterprise to another different site

ws — Tue, 22 Jul 2025 06:19:59 GMT

Hi @livehybrid,

Thanks for providing the information.

With using rsync, tested with All-in-One and it is working.

But in a situation whereby there's a cluster involved for the indexer/search head and it is in a separate network/location. Will the same method work?? or there's another method to follow?

Re: Rebuild and Migrate Splunk Enterprise to another different site

isoutamo — Fri, 25 Jul 2025 23:14:00 GMT

When you have cluster, then correct method is add nodes to it and after data has spread into those new nodes, then remove old nodes. Here is details how to do it https://community.splunk.com/t5/Splunk-Enterprise/Migration-of-Splunk-to-different-server-same-platform-Linux-but/m-p/538062