Envoy is an open-source edge and service proxy designed for cloud-native applications. It acts as a communication bus and universal data plane designed for large microservice architectures. Envoy is often used to manage traffic between services in a microservices architecture, providing features like load balancing, service discovery, and observability.
When working with Envoy, you might encounter an error message stating 'Listener Not Found'. This typically occurs when Envoy attempts to bind to a listener that is not defined in its configuration. This can lead to traffic not being routed correctly, causing service disruptions.
The 'Listener Not Found' error indicates that Envoy's configuration is missing a definition for a listener that is expected to be present. Listeners in Envoy are responsible for accepting incoming connections on a specific IP and port, and without them, Envoy cannot route traffic as intended.
To resolve this issue, follow these steps:
Ensure that the Envoy configuration file is correctly structured and includes the necessary listener definitions. Check for any typographical errors or missing sections. You can validate your YAML configuration using tools like YAML Lint.
Open your Envoy configuration file and locate the listeners section. Ensure that each listener is defined with the correct IP address and port. A typical listener configuration might look like this:
listeners:
- name: listener_0
address:
socket_address:
address: 0.0.0.0
port_value: 10000
Ensure that the path to your configuration file is correct when starting Envoy. Use the -c flag to specify the configuration file path:
$ envoy -c /path/to/envoy.yaml
Check Envoy's logs for any additional error messages that might provide more context. Logs can often point to specific lines or sections in the configuration that are problematic.
For more detailed information on configuring listeners in Envoy, refer to the official Envoy documentation. If you're new to Envoy, the Getting Started Guide is also a helpful resource.
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