Go
Learn how to connect to Kafka in Sealos DevBox using Go
This guide will walk you through the process of connecting to Kafka using Go within your Sealos DevBox project.
Prerequisites
- A Sealos DevBox project with Go environment
- A Kafka cluster created using the Database app in Sealos
Install Required Packages
In your Cursor terminal, install the necessary packages:
This command installs:
github.com/confluentinc/confluent-kafka-go/v2/kafka
: The Confluent Kafka client for Go
System Dependencies
The confluent-kafka-go
package requires librdkafka
as a system dependency. In Sealos DevBox, you might need to install it manually. Run the following commands in your Cursor terminal:
Connection Setup
Set up the environment variables
First, let's set up the environment variables for our Kafka connection. Create a .env
file in your project root with the following content:
Replace the placeholders with your actual Kafka broker address, group ID, and topic name from the Database app in Sealos.
Create the main.go file
Create a new file named main.go
with the following content:
Let's break down the main components of this code:
-
Imports and Variables: We import the necessary packages and define global variables for the broker address, group ID, and topic name.
-
startProducer function:
- Creates a new Kafka producer
- Uses a goroutine to handle delivery reports
- Produces sample messages to the specified topic
-
startConsumer function:
- Creates a new Kafka consumer
- Subscribes to the specified topic
- Continuously reads messages from the topic and prints them
-
Main function: Calls both
startProducer()
andstartConsumer()
to demonstrate producing and consuming messages.
Usage
To run the application, use the following command in your Cursor terminal:
This will execute the main
function, demonstrating both producing and consuming messages with Kafka.
Best Practices
- In a real-world scenario, separate the producer and consumer into different applications or services.
- Use environment variables for Kafka configuration instead of hardcoding values.
- Implement proper error handling and logging.
- Implement graceful shutdown to properly close Kafka connections.
Troubleshooting
If you encounter connection issues:
- Verify your Kafka broker address in the
broker
variable. - Ensure your Kafka cluster is running and accessible.
- Check for any network restrictions in your DevBox environment.
- Confirm that the required packages and system dependencies are correctly installed.
- If you encounter
cgo
related errors, make sure you have the necessary build tools installed (sudo apt-get install build-essential
).
For more detailed information on using Kafka with Go, refer to the confluent-kafka-go documentation.
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