vCloud Director SP 5.6.x has the ability to export VM statistics to an external database source which can then be queried via a set of new API calls. I’ve gone through a couple of different posts on how to configure the Cassandra/KairosDB data platform.

vCloud Director SP: VM Metrics Database Configuration Part 1
Installing and Configuring Cassandra and KairosDB on Ubuntu 14.04 LTS

This post finishes off the series and goes through the configuration of vCloud Director to start exporting VM metrics and then how to query the vCloud APIs to get those metrics. One thing to mention before continuing is that the vCD SP Documentation KairosDB v 0.9.1 is referenced as the version to install. Even though there are newer builds 0.9.1 is the only one tested and verified…other versions cause bugs and I have seen some strange results.

Configuring vCD SP Metric Database Connection:

Data for historic metrics is stored in a KairosDB database backed by a Cassandra cluster. Cassandra and KairosDB are configured you then use the cell-management-tool utility to connect vCloud Director to KairosDB. To create a connection from KairosDB to a vCloud Director, use a command line with the following form:

cell-management-tool configure-metrics options

Those familiar with the vCD cell.log entries you will notice a couple new startup entries…there is a new port (8999) thats bound for KairosDB communications and the tail end of the log above appears after the config..though I’m not sure what it actually does.

Once the cell services have been restarted the VM metrics should start to be collected by KairosDB. Wait about 5-10 minutes and then enter this URL into a web browser : http://IP-KairosDD:8080/api/v1/metricnames You should see the following displayed:

You can see that the results show metrics relating to VMs…this is a good thing! Using a RestClient you will see a much prettier output

API Calls to Retrieve Current and Historical Metrics:

The following API Calls are used to gather current and historical VM metrics for vCD VMs. The Machine ID required used the VM GUID as seen in vCenter. The ID can be sourced from the VM Name. The vCD Machine ID shown below in the brackets is what you are after.