Caching 
Introduce 
After installing a server, You can go to Applications to install Memcached and Redis . By default, none of these services are publicly visible and can only be accessed from within your server.
Connect to Redis 
Redis and Memcache are both available through 127.0.0.1 and their default ports.
MEMCACHED_HOST=127.0.0.1
MEMCACHED_PORT=11211
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379External connection 
When using a GUI Client or other external client to connect to your caching application, you will need to use SSH authentication