In this chapter, we are going to learn about some real-life issues taken from Proxmox's production environment and their solutions. Once a Proxmox cluster is set up, it usually runs without issues. However, when issues arise, a system administrator's knowledge is tested. Learning about troubleshooting is like learning from other people's mistakes. Throughout this chapter, we will gain some insight into Proxmox troubleshooting and hope that when we face these in our own clusters, we will know what do at a moment's notice.

All the issues explained in this chapter are those few that you may come across in your cluster environment. There could be more that are not covered in this chapter. It is just not possible to mention every possible issue that a Proxmox cluster can face. As you run your own cluster, you will have more unexpected issues that you will add to this list. It is a common practice for an administrator or operator to keep a documentation to enter...