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content/notes/10-scheduled-tasks-and-logs.md
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@ -73,6 +73,9 @@ Level
- LOG_NOTICE (5): normal but significant conditions - LOG_NOTICE (5): normal but significant conditions
- LOG_INFO (6): informational - LOG_INFO (6): informational
- LOG_DEBUG (7): debug-level messages, has lowest priority - LOG_DEBUG (7): debug-level messages, has lowest priority
> [!INFO] applies to individual applications as well as the kernel. e.g., LOG_EMERG in a application will exit straight after
> ERR most relevant to us
> need to set this level in syslogd.conf
Facility Facility
- Identify the type of process sending the message - Identify the type of process sending the message
@ -88,9 +91,23 @@ Facility
- LOG_SYSLOG: internal messages from syslogd - LOG_SYSLOG: internal messages from syslogd
- LOG_LOCAL0 - LOG_LOCAL0
- LOG_LOCAL7: local, discretional use by programmers. - LOG_LOCAL7: local, discretional use by programmers.
> [!INFO]
klogd klogd
- klogd provides a facility for system admin to check only kernel messages (which can also be checked through syslogd) - klogd provides a facility for system admin to check only kernel messages (which can also be checked through syslogd)
- Kernel messages can be read from /proc/kmsg - Kernel messages can be read from /proc/kmsg
- Use /proc/sys/kernel/printk to control the level of log messages. - Use /proc/sys/kernel/printk to control the level of log messages.
- cat /proc/sys/kernel/printk - cat /proc/sys/kernel/printk
> [!INFO] /proc has kernel information about system
> klogd is an application level deamon that cleans up logs
syslog.conf
- Syslogd configuration file
- /etc/syslog.conf
- Consists of . entries
- mail.* /var/log/maillog
- authpriv.* /var/log/secure
- *.alert root, mal
- Use “man 5 syslog.conf” to find more information about the format of the file
Log processing • Log scanning and filtering – Scanning: use scripts (put as a cron job) to scan key words in log files – Filtering: use scripts to remove useless messages from the log files • Pros and cons of scanning and filtering – Scanning: can find useful information, but may have to process a large amount of log files – Filtering: can reduce the amount of log files but may miss some useful information.