Envoy Envoy Not Listening on Port

Envoy is not listening on the expected port due to configuration errors.
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What is

Envoy Envoy Not Listening on Port

 ?

Understanding Envoy Proxy

Envoy is an open-source edge and service proxy designed for cloud-native applications. It is often used as a sidecar proxy in microservices architectures to handle service-to-service communication, load balancing, and observability. Envoy's flexibility and configurability make it a popular choice for managing network traffic in complex environments.

Identifying the Symptom

One common issue encountered with Envoy is when it is not listening on the expected port. This can manifest as an inability to connect to services through Envoy, resulting in failed requests or timeouts. The symptom is typically observed when attempting to access a service through Envoy and receiving no response.

Common Error Messages

When Envoy is not listening on the expected port, you might not see explicit error messages in the logs, but rather a lack of connectivity. Checking the Envoy logs for any warnings or errors related to listener configuration can provide clues.

Exploring the Issue

The root cause of Envoy not listening on a port is often due to configuration errors. Envoy's configuration is defined in YAML files, and a misconfiguration can prevent it from binding to the desired port. Additionally, if the port is already in use by another process, Envoy will fail to start the listener.

Configuration Errors

Errors in the listener configuration section of the Envoy YAML file can lead to this issue. It's crucial to ensure that the listener is correctly defined with the appropriate address and port.

Steps to Fix the Issue

To resolve the issue of Envoy not listening on the expected port, follow these steps:

1. Verify Listener Configuration

Check the Envoy configuration file (typically a YAML file) to ensure that the listener is correctly defined. Look for the listeners section and verify the address and port_value:

listeners:
- name: listener_0
address:
socket_address:
address: 0.0.0.0
port_value: 8080

Ensure that the port_value matches the expected port.

2. Check for Port Conflicts

Ensure that the port is not already in use by another process. You can use the following command to check for processes using the port:

lsof -i :8080

If another process is using the port, either stop that process or configure Envoy to use a different port.

3. Restart Envoy

After verifying the configuration and ensuring no port conflicts, restart the Envoy service to apply the changes:

systemctl restart envoy

Or, if running Envoy manually:

envoy -c /path/to/envoy.yaml

Additional Resources

For more detailed information on configuring Envoy, refer to the Envoy Listener Configuration documentation. Additionally, the Envoy Getting Started Guide provides a comprehensive overview of setting up and running Envoy.

Attached error: 
Envoy Envoy Not Listening on Port
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