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, providing features like load balancing, service discovery, and observability.
When configuring Envoy, you might encounter an error related to an 'Invalid Retry Policy'. This typically manifests as a failure in the service communication where retries are expected but do not occur as configured. The error might not always be explicit, but the symptom is usually observed as a lack of retries in failure scenarios.
The 'Invalid Retry Policy' issue arises when the retry configuration in Envoy is either incorrectly specified or not applicable to the context. This can happen due to syntax errors, unsupported retry conditions, or misalignment with the service's requirements.
Retry policies in Envoy are defined within the route configuration and dictate how Envoy should handle failed requests. These policies include parameters like retry conditions, retry attempts, and retry timeout. For more details, refer to the Envoy Retry Policy Documentation.
To resolve the 'Invalid Retry Policy' issue, follow these steps:
Examine the Envoy configuration file to ensure that the retry policy is correctly defined. Check for syntax errors and ensure that all required fields are specified. Here is an example of a valid retry policy:
{
"retry_policy": {
"retry_on": "5xx",
"num_retries": 3,
"per_try_timeout": "2s"
}
}
Ensure that the retry conditions specified are supported by Envoy. Common conditions include '5xx', 'gateway-error', and 'connect-failure'. Refer to the Envoy Retry Conditions for a complete list.
After making changes, test the configuration to ensure that retries are functioning as expected. You can use tools like curl to simulate requests and observe the behavior.
By carefully reviewing and correcting the retry policy configuration, you can resolve the 'Invalid Retry Policy' issue in Envoy. Properly configured retry policies ensure robust and resilient service communication, enhancing the overall reliability of your microservices architecture.
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