CentOS CloudStack

CloudStack Usage Server Fails To Start

On a freshly installed Apache CloudStack 4.3.0 installation, the cloudstack-usage server fails to start as below: This is probably a side effect of newer version of OpenJDK being released for CentOS via EPEL which /etc/init.d/cloudstack-usage start script does not know about. The right location for java-1.7.0-openjdk JAVA_HOME is /usr/lib/jvm/java-1.7.0-openjdk- and and is easily fixed with […]

CloudStack XenServer

CloudStack SSVM Network Topology with XenServer

For those trying to debug SSVM networking, the following screenshots should help narrow down the issue. These screenshots are from a Apache CloudStack 4.3.0 environment with XenServer hypervisor hosts. Each XenServer hosts has 4 physical network interfaces labeled as below: NIC0 – MGMT NIC1 – STORAGE (NOTE: Storage is unused in my setup) NIC2 – […]

CloudStack Ubuntu XenServer

Running Ubuntu 14.04 “Trusty Tahir” on XenServer CloudStack

The recently released Ubuntu 14.04 “Trusty Tahir” LTS release comes with Xen HVM (Hardware-assisted virtualization) support. Previous LTS releases supported the older Xen PV (para-virtualization) mode only. Phoronix has recently published a comparison between Ubuntu 14.04 Xen PV with Xen HVM virtualisation which seems to suggest that Ubuntu 14.04 with Xen HVM performs better than […]