Fixes #36645 - Change the default Redis cache DB to 4 #1122
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On a typical Katello installation Dynflow uses DB 6 and Pulp uses DB 8. Other applications may also use the default DB. Using DB 4 should not conflict.
@evgeni this is something you raised yesterday.
This probably deserves a release note. We should also consider cleaning up the old DB. By default Redis is configured for persistence so it should remain even after a restart. According to the internet using
redis-cli -n 0 flushdb
should do that. I don't think it's something we want to do automatically. If users don't do this, they will expire eventually anyway and the cache is not that large.