Error log configuration in Nginx - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the error_log directive in nginx?

The error_log directive tells nginx where to save error messages and what level of errors to record. It helps track problems in the server.

beginner

How do you set the error log file path and error level in nginx?

Use error_log /path/to/logfile level; inside the nginx configuration. For example, error_log /var/log/nginx/error.log warn; saves warnings and above to that file.

intermediate

Name four common error log levels in nginx.

The common levels are debug, info, notice, warn, error, and crit. They control how detailed the logs are.

intermediate

Where can the error_log directive be placed in nginx configuration?

It can be placed in the main context (top level), http, server, or location blocks. More specific blocks override higher-level settings.

advanced

What happens if you set the error log level to debug?

nginx logs very detailed information about its operations, which helps in deep troubleshooting but can create large log files and slow performance.

Which directive sets the error log file in nginx?

A log_format

B access_log

C error_log

D server_log

The error_log directive configures where nginx writes error messages.

What is the default error log level if none is specified?

A error

B info

C warn

D debug

If no level is set, nginx uses error level by default.

Where can you NOT place the error_log directive?

A server block

B inside a <code>if</code> statement

C location block

D http block

The error_log directive cannot be placed inside if statements.

Which error log level records the least amount of information?

A crit

B warn

C info

D debug

crit logs only critical errors, so it records the least information.

What is a risk of setting error log level to debug in production?

A Logs may miss errors

B No logs are created

C Logs become too small

D Performance may slow and logs grow large

Debug level creates very detailed logs, which can slow the server and fill disk space quickly.

Explain how to configure error logging in nginx including setting the log file and log level.

Think about the directive format and where it goes in the config.

Describe the impact of different error log levels on nginx logging and server performance.

Consider what happens when you log more or less information.