Redis

What is redis

An distributed in-memory key-value database.
distributed: redis can scale from a single instance to a distributed system.
in-memory: that’s why redis is fast and commonly serves as cache.
key-value: redis stores key-value pairs.

Why redis

As an in-memory cache, redis is much faster than traditional RDBMS.
Helps reduce database workload.

Install

Server: See offical install procedure here.
As no offical windows install file provided, tporadowski provides an unoffical install file.

Client: redis server ships with a cli tool redis-cli. For GUI client, check RedisInsight out.

Config

Difference between redis.windows-service.conf and redis.windows.conf

redis.windows-service.conf: Configuration file for windows service.
reids.windows.conf: Configuration file for command line.

Security

Default redis requires no auth, but cannot access from machine other than localhost.
To enable remote access (only tested on windows):
In file redis.windows-service.conf:

1. Comment bind 127.0.0.1(line 64). This makes redis listen to all interfaces.
2. Change procted-mode yes to protected-mode no(line 83). All clients are now able to connect in.
3. Uncomment requirepass foobared(line 503) and replace foobared to your own password.

Use

Different types

Type	Description
Hash	Key-value dictionary object.
Sorted Set	Sorted set.
Set	Unsorted set.
String	Simplest type. String or number.
List	Linked list under the hood. Can add element to the head/left or the tail/right.
JSON	JSON object. Requires RedisJSON module be installed.

Commands

redis-cli: connects to localhost on port 6379.
redis-cli -h [host] -p [port] -a [password]: connect to specified host and port. If password contains special character, wrap it in quotes.

node redis

Note that redis does not work in browser environment.