A working Ceilometer installation will have several processes running, some of which are as follows:
ceilometer-apiceilometer-collectorceilometer-pollingceilometer-agent-notification
When troubleshooting Ceilometer, an effective place to start is ensuring that each of the preceding processes run. As we've seen before, we can verify this by running either ps -aux or pgrep on Ceilometer. Take the following command, for example:
Alternatively, you can use the pgrep command to retrieve similar information. An example is included in the following screenshot:
If any of these processes are not running as expected, you can search the log files for possible clues. The log files for Ceilometer are typically stored at /var/log/ceilometer, but you can confirm the log file location by checking the Ceilometer configuration file for the value of the log_dir variable. If the log files are empty or do not provide any clues, you can attempt to start the services manually, which will...
