brew install redis

redis-cli <hostname>

hostname:6379>ping

PONG

Note, a quick way of testing without installing redis is to use nc. i.e.

$ (printf "PING\r\n";) | nc <hostname> 6379 
+PONG

You can also do this with curl.

See:

• https://redis.io/topics/quickstart
• https://medium.com/@petehouston/install-and-config-redis-on-mac-os-x-via-homebrew-eb8df9a4f298
• https://stackoverflow.com/questions/33243121/abuse-curl-to-communicate-with-redis