Envoy is a high-performance open-source edge and service proxy designed for cloud-native applications. It is used to manage traffic between microservices, providing features such as load balancing, service discovery, and observability. Envoy's logging capabilities are crucial for monitoring and debugging applications, as they provide insights into traffic patterns and system behavior.
One common issue users encounter with Envoy is the absence of logs. This can manifest as missing log files or empty log entries, which can hinder the ability to diagnose and troubleshoot issues within the service mesh. Without proper logging, understanding the flow of requests and identifying errors becomes challenging.
The root cause of logging issues in Envoy often stems from misconfiguration or permission problems. Envoy requires a correctly configured logging setup and appropriate permissions to write logs to the specified directory. If these are not set up correctly, Envoy will fail to generate logs, leading to the observed symptom.
Misconfigurations can include incorrect file paths, unsupported log formats, or missing log levels. It's essential to ensure that the logging configuration in the Envoy configuration file is accurate and aligns with the desired logging behavior.
Envoy needs the necessary permissions to write logs to the specified directory. If the user running Envoy does not have write access to the log directory, logging will fail. This is a common oversight, especially in environments with strict security policies.
To resolve logging issues in Envoy, follow these steps:
Check the Envoy configuration file (usually in YAML format) for the logging section. Ensure that the file paths, log formats, and log levels are correctly specified. Here is an example of a basic logging configuration:
static_resources:
listeners:
# Listener configuration
clusters:
# Cluster configuration
admin:
access_log_path: "/var/log/envoy/access.log"
address:
socket_address: { address: 0.0.0.0, port_value: 9901 }
Ensure that the access_log_path is correct and points to a valid directory.
Ensure that the directory specified in the access_log_path is writable by the user running Envoy. You can check and modify permissions using the following commands:
sudo chown -R envoy_user:envoy_group /var/log/envoy
sudo chmod -R 755 /var/log/envoy
Replace envoy_user and envoy_group with the appropriate user and group names.
After making changes to the configuration or permissions, restart the Envoy service to apply the changes:
sudo systemctl restart envoy
Alternatively, if you are running Envoy in a containerized environment, use the appropriate container management commands to restart the service.
For more detailed information on configuring Envoy logging, refer to the Envoy Admin Interface Documentation. Additionally, the Envoy CLI Documentation provides insights into managing and troubleshooting Envoy instances.
By following these steps, you should be able to resolve logging issues in Envoy and ensure that logs are generated correctly, aiding in effective monitoring and troubleshooting of your service mesh.
Let Dr. Droid create custom investigation plans for your infrastructure.
Book Demo
