Summary

So there we have it! In this section, we covered some general OpenStack troubleshooting skills that will prepare you for the COA exam. Remember that the troubleshooting domain covers only about 13% of the exam, so don't expect many questions on this content. Although it's not an exam objective, you should understand how to use the --debug flag to provide clues when troubleshooting OpenStack issues on the CLI. I also showed you how some OpenStack service APIs allow you to check the status of their components/agents. The most important exam objective in this section is to remember the OpenStack service log file locations, and how to grep through them when identifying specific messages. And lastly, we ended the chapter with some very basic MySQL/MariaDB skills, including showing tables of specific databases, backing up, and restoring databases.

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