Configuring systemd Journaling

30 minutes
  • 3 Learning Objectives

About this Hands-on Lab

Journals and their importance to `systemd` are a major change from the previous model of Linux logging, namely `Syslog` and its variants. As even the format of the logs or journal has changed, this is a true disruptor, or it could have been if the `systemd` team hadn’t put in some key migration and integration features—such as forwarding to `syslog` and the excellent `journalctl` command, which we’ll use heavily in this lab.

In this lab, you’ll gain the skills needed with `journalctl`:

* From simple querying to viewing boot session entries
* Monitoring a service, user’s entries by UID, times, and ranges of entries
* Extending your journal entries with standardized explanations from the Message Catalog.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Query and View Journal Entries Including Boot Sessions
  • View journal entries for a user and the system.
  • View available boot sessions and entries.
Monitor Services, CGroups, and Ranges
  • Monitor a service’s entries.
  • View a user’s scope entries.
  • View entries based on times and ranges.
Query User and Process Entries, and Add Explanations
  • Find a user’s UID and journal entries for it.
  • Find a process ID and view its entries.
  • View the Message Catalog.
  • Enhance journal entries with explanations.

Additional Resources

You're a experienced Linux sysadmin who knows a fair bit about syslog logging, but you have systemd-based systems now and need to come up to speed on journals.

In this lab, you'll learn journalctl basics:

  • Viewing journal entries for yourself and the entire system
  • Monitoring service entries, entries by user ID and cgroup
  • Viewing ranges of entries based on times
  • Adding standardized explanations to journal entries

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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