Envoy is an open-source edge and service proxy designed for cloud-native applications. It is often used as a sidecar in service mesh architectures, providing features like load balancing, service discovery, and observability. Envoy is highly configurable and can be used to manage traffic between microservices, making it a critical component in modern application architectures.
The 404 Not Found error is a common HTTP status code indicating that the server could not find the requested resource. When using Envoy, this error typically means that the proxy is unable to route the request to the appropriate backend service or endpoint.
When encountering a 404 error in Envoy, you might see log entries indicating that a request could not be fulfilled. Users will see a 404 status code in their browser or API client, often accompanied by a message stating that the resource is unavailable.
The primary cause of a 404 error in Envoy is a misconfiguration in the routing rules or the absence of the requested resource. This can occur if the URL is incorrect, the resource has been moved or deleted, or if there is a typo in the configuration files.
To resolve a 404 error in Envoy, follow these steps:
Ensure that the URL being requested is correct. Check for typos or incorrect paths. If the resource has been moved, update the URL accordingly.
Review the Envoy configuration files to ensure that the routing rules are correctly defined. Look for any discrepancies in the routes section. Here is an example of a basic route configuration:
static_resources:
listeners:
- name: listener_0
address:
socket_address: { address: 0.0.0.0, port_value: 10000 }
filter_chains:
- filters:
- name: envoy.filters.network.http_connection_manager
config:
route_config:
name: local_route
virtual_hosts:
- name: backend
domains: ["*"]
routes:
- match: { prefix: "/" }
route: { cluster: service_backend }
Check that the backend service is running and accessible. Use tools like curl or HTTPie to test connectivity to the backend service directly.
If you are using service discovery, ensure that the service is correctly registered and discoverable by Envoy. Check the service registry for any discrepancies.
By following these steps, you should be able to diagnose and resolve 404 errors in Envoy. Proper configuration and verification of URLs and backend services are crucial to ensuring that requests are routed correctly. For more detailed information, refer to the Envoy documentation.
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