Process and OS kernel need to be record a log of event that happen. These logs can be useful for auditing the system and troubleshootingproblems. Red Hat Log files are stored in /var/log directory. Red hat 7 syslog messages are handle by two services Systemd-journald and rsyslog.
ryslog:-
- It will sort the syslog messages by type and priority then it will store on /var/log directory.
- rsyslog start with oldest message on top and the newest message at end of the log file.
- Example of log entry for /var/log/secure.
- Timestamp when log entry was recorded.
- Hostname from which the log message was sent.
- Process that sent the log message.
- Actual message sent.
Syslog Priority:
Systemd-journald:-
It collect messages from kernel, the early stages of the boot process, standard output, syslog and error of daemons as they start up and run. Syslog messages are forwarded by Systemd-journald to rsyslog.
To monitor a log files use the below mentioned command.
Syntax:
tail –f /path/to/file -> It will display last 10 lines of the logs.
We can give any number instead of –f also. Look into an example where I have used 5. Where it display last 5 entries of logs.
Example:
tail –f /var/log/messages
tail –f /var/log/cron
tail –f /var/log/boot.log
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
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