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:
- Comment
bind 127.0.0.1(line 64). This makes redis listen to all interfaces. - Change
procted-mode yestoprotected-mode no(line 83). All clients are now able to connect in. - Uncomment
requirepass foobared(line 503) and replacefoobaredto 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.
