本文介绍了systemd中LogLevelMax配置选项的用途，用于限制服务单元的日志级别。默认情况下，所有级别的日志都会被记录。设置LogLevelMax如LogLevelMax=info，可以关闭特定服务的调试日志。示例配置中展示了如何设定日志级别为5，并给出了当设置错误时，systemd如何在journal中输出错误信息的例子。
配置解释
LogLevelMax= 当前服务单元设置的日志级别过来条件。具体的值和syslog的日志级别一致。有emerg (lowest log level, only highest priority messages), alert, crit, err, warning, notice, info, debug (highest log level, also lowest priority messages)。详细的需要看帮助syslog(3)。默认没有应用过来条件，就是不打印任何日志。 (i.e. the default maximum log level is debug)。Use this option to configure the logging system to drop log messages of a specific service above the specified level. For example, set LogLevelMax=info in order to turn off debug logging of a particularly chatty unit. Note that the configured level is applied to any log messages written by any of the processes belonging to this unit, sent via any supported logging protocol. The filtering is applied early in the logging pipeline, before any kind of fu
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