failure of conneciton to redissentinel = nutcracker file breaks

[joe-at-startupmedia]

When our redis sentinel was updated to version 3 starting the process would break the nutcracker configuration file and crash the entire cluster as a result.

Version updated to:

[root@startup-redissentinel ~]# redis-sentinel --version
Redis server v=3.2.10 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64 build=c8b45a0ec7dc67c6

When there is an issue connecting to a sentinel, the config file shouldn't be touched, insetad
the program should just exit.

Found that the protected_mode feature was added to the sentinel and when the service was restarted everything worked fine again.

https://stackoverflow.com/questions/41223618/sentinel-running-on-protected-mode