VPP Logging Configuration

VPP logging is an important part of monitoring and troubleshooting the performance and behavior of the VPP dataplane.

VPP logs are stored in the /var/log/vpp.log file. Additionally daemon logs can be found in the system journal.

Logging detalization can be configured via the next command:

set vpp settings logging default-log-level <level>

Where <level> can be one of the following:

emerg (Emergency) - System is unusable.
alert (Alert) - Immediate action required.
crit (Critical) - Critical conditions.
err (Error) - Error conditions.
warn (Warning) - Warning conditions.
notice (Notice) - Normal but significant.
info (Informational) - Routine informational messages.
debug (Debug) - Detailed debugging messages.
disabled (Disabled) - Logging disabled.

It is recommended to set logging level to debug only for troubleshooting purposes, as it can generate a large volume of log data. For regular operation, a level of info or warn is usually sufficient.

Potential Issues and Troubleshooting

Improper logging configuration can lead to various issues, including:

Excessive log file sizes if the logging level is set too high (e.g., debug)
Missing critical information if the logging level is set too low (e.g., alert)
Performance degradation due to excessive logging overhead

Consider adjusting the logging level if you experience issues mentioned above.