hint: You're not able to control which redis slave will chosen for the failover.

1. Connect to your sentinel instance:

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   redis-cli -p <SENTINEL-PORT>
   

2. Have a look at the current master and the available slaves

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   SENTINEL masters
   

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   SENTINEL slaves <master name>
   

3. Force a failover

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   SENTINEL failover <master name> 
   

4. After some seconds you can have a second look at the current master:

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   SENTINEL masters
   

   The IP should have changed.