Novice Level

Working with Log Files and Journals on RHEL 8

15 minutes

2 Learning Objectives

System logging is an important function in Linux. Without logs, troubleshooting would be much more difficult. Even _with_ logs, you’re swimming in a sea of data. Knowing how to find what you’re looking for is important. In this hands-on lab, we will cover how to locate and interpret system log files and journals. We will also examine how we can preserve system journals across reboots.

**Red Hat Exam Requirements Covered:**
– Locate and interpret system log files and journals
– Preserve system journals

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Locate and Interpret System Log Files and Journals

Query the journal for a number of entries
Query the journal for a list of boot session entries, then query a particular session
Perform simple journal queries
Query the journal for a range of entries based on date/time

Preserve System Journals

Determine the settings for the journal persistence
Create the needed directory
Confirm the journal has been made persistent
Ensure all entries are pushed to persistent storage

Additional Resources

In this lab, you're the sysadmin of a server that has just been installed with the defaults and you want to ensure that all your system's journal entries from the first boot onward will always be available for your querying.

You'll investigate the current journal settings, the journal location, and then do both some simple and some more advanced queries of your existing journal to familiarize yourself with the commands and the expected outputs.

You'll then make the needed changes to ensure that your system's journal will be located in the /var/log/journal directory and be persistent across system reboots.

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