Reading up on redis-sentinel to prepare for adding support for it to puppet-redis. The main challenge is dealing with the fact that the sentinel binary wants to write to the config file. This is problematic for puppet: It will try to update the file (since it doesn't match the manifest) with each run of puppet. The way around this is to write a different file and only copy it to actual config if there was a change (in the original). This preserves the desired functionality: Update the config when the master changes, only.

Beyond that the major issues are just doing the manual work to put it together and see if it works properly.