42-transcendence

What is Redis?

Redis (Remote Dictionary Server) is an open-source, in-memory data structure store used as:

• Database
• Cache
• Message broker
• Real-time data store

Key Features:

• Extremely fast (in-memory access)
• Supports various data structures (strings, hashes, lists, sets)
• Persistence options
• Pub/Sub messaging pattern

Redis in this Project

Check if Redis is running:

docker-compose exec redis redis-cli

Basic connectivity test:

127.0.0.1:6379> ping
PONG

Test data storage:

127.0.0.1:6379> set mykey "Hello, Redis!"
OK
127.0.0.1:6379> get mykey
"Hello, Redis!"
127.0.0.1:6379> del mykey
(integer) 1
127.0.0.1:6379> get mykey
(nil)

Test Pub/Sub (Game Server):

Terminal 1 (Subscriber):

127.0.0.1:6379> subscribe game_channel

Terminal 2 (Publisher):

127.0.0.1:6379> publish game_channel "Test message"

Useful commands:

127.0.0.1:6379> keys * (List all keys)
127.0.0.1:6379> set (Set key value)
127.0.0.1:6379> get (Get value of key)
127.0.0.1:6379> del (Delete key)
127.0.0.1:6379> del * (Delete all keys)
127.0.0.1:6379> info (Get server information)
127.0.0.1:6379> monitor (Log all commands)
127.0.0.1:6379> flushdb (Delete all keys in current database)

Flush all data:

docker-compose exec redis redis-cli flushall

Chat

# Terminal 1 (Subscriber)
docker-compose exec redis redis-cli
127.0.0.1:6379> SUBSCRIBE chat_general

# Terminal 2 (Publisher)
docker-compose exec redis redis-cli
127.0.0.1:6379> PUBLISH chat_general "Hello world!"

From the mac

Install redis-cli

brew install redis

The you will be able to login into the running container with

laurentb@MutantBot ft_transcendence % redis-cli -p 6380
127.0.0.1:6380> keys
(error) ERR wrong number of arguments for 'keys' command
127.0.0.1:6380> keys *
(empty array)

redis in grafana

In Grafana you can import a dashboard. When going to localhost:3000, you can import a dashboard from the grafana.com. First go to connections data source, there will be a plus + button on the top right. You will be able to import the standard redis dashboard with 12776. electing your redis data source, you can import the dashboard and connect it. Then you will be able to see the dashboard with the data from the redis server. I will add some screenshots of the process. This is how the page looks like when you are connecting the redis data source.

with save and test you can check if the connection is working.

Next you will add the dashboard with id 12776.
This is how it will look like:

You click on redis and you get to the dashboard.