What impact does Debian log level setting have on the system

The log level settings of the Debian system directly affect the system's operating efficiency, security and problem-solving capabilities. This article explains the Debian log level settings and their impact in detail.

Detailed explanation of log level

The log level determines the level of detailed information recorded by the system. The higher the level, the less information recorded, and vice versa. Common log levels (from low to high) include:

• Emerg: The system crashes and needs to be dealt with immediately.
• alert: Serious problem, immediate action is required.
• crit (critical error): Critical error, affecting system functions.
• err (Error): Error, but the system can still run.
• warning: Potential problem, which may lead to errors.
• notice: Normal but important information.
• info (information): General information, used for system status monitoring.
• debug (debug): Detailed debug information, mainly used for development and troubleshooting.

Impact of log level settings

• Performance: Higher log levels (such as debug) will generate a large amount of logs, occupying a lot of disk space and system resources, which may affect system performance, especially under high load conditions.

• Security: Log files may contain sensitive information, such as user activity and system configuration. The appropriate log level balances information integrity and security. Excessive level of detail may increase security risks.

• Troubleshooting: Lower log levels (debug or info) provide more context information for quick location and resolution of issues. The production environment usually recommends using the warning or err level, which preserves critical information while reducing interference.

• Compliance: Certain industry standards and regulations have requirements for logging levels and retention periods, and correctly configuring the logging levels can help meet these requirements.

• Resource management: Regularly clean old log files to free up disk space, and use tools such as logrotate to automatically manage log file size and quantity.

Log level setting method

In Debian systems, you can modify the log level by editing the configuration files under /etc/rsyslog.conf or /etc/rsyslog.d/ directory. For example:

 <code># 设置全局默认日志级别为warn $DefaultLoggingLevel warn # 为特定服务设置更高的日志级别(例如，将myapp服务的日志级别设置为debug) local0.* /var/log/myapp.log & ~ # 停止进一步处理这些消息# 重启rsyslog服务应用更改sudo systemctl restart rsyslog</code>

Important tips:

• Before modifying the log level, please fully understand its impact.
• Before modifying the production environment, it is recommended to verify it in the test environment first.
• Regularly monitor log file size and growth rate to avoid excessive resources.

In short, rationally configuring the Debian log level is crucial for system stability, security and problem-solving.

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