Whether we want to accept it or not, a network environment is always at risk of something going wrong. Even if we take out the hardware and software from the equation, there is always the human factor. Sometimes all it takes is a small mistake that can snowball very rapidly to something major. A well thought out disaster plan can go a long way to combating a situation, or sometimes on the ball quick thinking can save the day.

As we approach the end of the book, in this concluding chapter we are going to see some situations where things went wrong and what do to do when the same happens to you in the virtual environment you are part of. Like Chapter 15, Proxmox Troubleshooting, these are not all-inclusive scenarios. You may, or will, come across other situations that are not covered in this chapter. As a good administrator, you can expand on this through your own documentation, but we hope we were able to put together some critical situations that you may face in your career and that the solutions provided here will prove extremely valuable.

This chapter is divided into the following categories of scenario:

• Recovering from OS drive failure
• Recovering from a quorum failure
• Recovering from a node failure
• Recovering from a network failure
• Recovering from Ceph failure