Redis on Kenno's Open Note

Delete ElastiCache Redis Cluster Using AWS CLI

Wed, 03 Jul 2024 21:46:56 +1000

Once upon a time there exist an ElastiCache Redis cluster that I no longer needed. I know that the cluster could be deleted via ElastiCache web console. However, as a command-line addict as myself, I wanted to use AWS CLI to delete the cluster instead.

Well, actually this is my first time trying to delete an ElastiCache cluster using the CLI. I’m going to try to document how I do this, and what mistakes I’d make a long the way. The cluster name is called ‘my-test-cluster’. Let’s get started

Connect to a Redis cluster with Python

Wed, 03 Apr 2024 22:27:50 +1100

To connect to a Redis server with Python, one can use python3-redis module.

First verify that python3-redis module is installed. I’m showing the package name in Fedora 39, if you use a different distro, then check for the relevant package name.

$ rpm -q python3-redis
python3-redis-4.3.3-1.el9.noarch

Here is the sample code to connect to a non-cluster Redis server:

import redis

# Connect to Redis
r = redis.Redis(host='10.97.147.175', port=6379)

# Set a key-value pair
r.set('my_key', 'Hello, Redis!')

# Get the value of the key
value = r.get('my_key')
print(value.decode('utf-8'))

If you want to connect to a Redis cluster (that has both master and replicas), use this version instead:

How to Run Redis in Podman Container

Wed, 22 Feb 2023 23:30:49 +1100

This is just a quick note on how to run Redis as a container using Podman on Ubuntu 22.04 (i.e. there will be no mention about SELinux.)

Create a persistent volume for the Redis container

I like storing all data/volume for containers under /srv/data. So I’ll create a sub-directory called redis-data under the same location.

# mkdir -p /srv/data/redis-data

Pull the Redis image

# podman pull docker.io/redis

Create and run the Redis container

# podman run -d --name redis_server \
    -v /srv/data/redis-data:/var/redis/data \
    -p 6379:6379 redis

Create systemd service for the Redis container

I like creating a systemd service to enable/start the container.