vCloud Director can collect metrics that provide current and historic information about virtual machine performance and resource consumption for the virtual machines that are in your cloud. Data for historic metrics is stored in a Cassandra cluster.
Cassandra is an open source database that you can use to provide the backing store for a scalable, high-performance solution for collecting time series data like virtual machine metrics. If you want vCloud Director to support retrieval of historic metrics from virtual machines, you must install and configure a Cassandra cluster and use the cell-management-tool to connect the cluster to vCloud Director. Retrieval of current metrics does not require optional database software.
- Verify that vCloud Director is installed and running before you configure the optional database software.
- If you are not already familiar with Cassandra review the material available at http://cassandra.apache.org/.
- See the vCloud Director Release Notes for a list of Cassandra releases supported for use as a metrics database. You can download Cassandra from http://cassandra.apache.org/download/.
- Install and configure the Cassandra cluster :
- The Cassandra cluster must include least four virtual machines deployed on two or more hosts.
- Two Cassandra seed nodes are required.
- Enable Cassandra client-to-node encryption. See http://docs.datastax.com/en/cassandra/3.0/cassandra/configuration/secureSSLIntro.html.
- Enable Cassandra user authentication. See http://docs.datastax.com/en/cassandra/3.0/cassandra/configuration/secureConfigNativeAuth.html.
- Enable Java Native Access (JNA) version 3.2.7 or later on each Cassandra cluster.
- Cassandra node-to-node encryption is optional.
- Use of SSL with Cassandra is optional. If you decide not to enable SSL for Cassandra, you must set the configuration parameter
0in the global.properties file on each cell ($VCLOUD_HOME/etc/global.properties)
- Use the cell-management-tool utility to configure a connection between vCloud Director and the nodes in the Cassandra cluster.
Use a command like this, where node1-ip, node2-ip, node3-ip and node4-ip are the IP address of the members of the Cassandra cluster. The default port (9042) is used. Metrics data are retained for 15 days.
[root@cell1 /opt/vmware/vcloud-director/bin]# ./cell-management-tool cassandra --configure --create-schema \ --cluster-nodes node1-ip,node2-ip,node3-ip, node4-ip \ --username admin --password 'P@55w0rd' --ttl 15For more information see the "Cell Management Tool Reference" in the vCloud Director Administrator's Guide.
- Restart each vCloud Director cell.