root@tts-0001:~# redis-cli
redis 127.0.0.1:6379> config get requirepass
1) "requirepass"
2) (nil)
redis 127.0.0.1:6379> config set requirepass 72redis
OK
redis 127.0.0.1:6379> config get requirepass
(error) ERR operation not permitted
redis 127.0.0.1:6379> auth 72redis
OK
redis 127.0.0.1:6379> config get requirepass
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1) "requirepass"
2) "72redis"
redis 127.0.0.1:6379> quit
root@tts-0001:~# redis-cli
redis 127.0.0.1:6379> ping
(error) ERR operation not permitted
redis 127.0.0.1:6379> auth 72redis
OK
redis 127.0.0.1:6379>config set requirepass ""
redis 127.0.0.1:6379> quit