Starting in 6.6, a non-default security key is required. The security key, also known as the pass4SymmKey setting, authenticates communication between the manager node and the peers and search heads. Upgrading an indexer cluster that does not have a custom security key? If you don't want to perform an indexer cluster rolling upgrade, you can instead follow the steps for tiered upgrades. See Perform a rolling upgrade of a Splunk Enterprise indexer cluster. Upgrade the search head cluster as part of the procedure for performing an indexer cluster rolling upgrade. Upgrading an indexer cluster that integrates with a search head cluster? To convert a single-site indexer cluster to multisite, perform the upgrade first and then read Migrate an indexer cluster from single-site to multisite. How to perform a site-by-site upgrade of a multisite indexer cluster.How to upgrade an indexer cluster that integrates with a search head cluster.Upgrading to a new maintenance release (for example, from 8.1.1 to 8.1.2). This topic covers these version-based scenarios: The upgrade process differs considerably depending on the nature of the upgrade.
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