With the number of moving parts that make up an OpenStack installation, it is inevitable that as the cluster is brought up for the first time, a few things will not work. Further, as the cluster operates, there will also be service failures that should be addressed. It is very important to be able to troubleshoot a running OpenStack installation. Let's take a look at some of the details of how things work under the hood and how to figure out what is going wrong when things are not working properly. We will look at general troubleshooting and then take a look in detail at a few components to help troubleshoot each of them.