23 articles on this topic
When running packstack to install OpenStack, the following error may appear: [root@openstack-liberty1 ~]# packstack --answer-file=answers.txt ERROR:root:Failed to load plugin from file prescript_000.py
If VMs cannot ping their gateway or router after creating a network and router in OpenStack, check the VLAN tags in Open vSwitch on the compute and network nodes.
If cloud-config on an AWS EC2 instance or OpenStack does not behave as configured, and the error log shows Failed at merging in cloud config part from ... as below…
A collection of OpenStack cloud images for various distributions, for creating images in Glance. CirrOS is a small Linux cloud image for testing instance creation.
Windows Server 2008 R2 installation on KVM can report Error: 0x80300001 when the installer cannot find or read its DVD-ROM after loading virtio drivers.
Adding a datastore to VMware ESX/ESXi with Add Storage wizard may fail with: An error occurred during host configuration. Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOpt
If you run Zimbra on OpenVZ, the zimbra service may fail to start with errors like these: Notification skipped. Starting servers...Could not create the Java virtual machine. Unable to deter
OpenVZ is an OS-level server virtualization solution, also called container virtualization. It is popular for Virtual Private Servers (VPSs), each called a container.
Virtualization technology is now widely used, most commonly for VPS, or Virtual Private Server, hosting. There are many virtualization software products.
Red Hat failover clustering has an interesting feature for controlling a dependent service when its primary service starts or stops: the depend_mode attribute.
A computer cluster is a group of connected computers that work together as if they were one computer. Each machine connects through a fast local area network. Clusters are generally…
Incorrect mouse movement in a Linux virtual machine can be fixed in two ways: switch from the VNC console to an SDL console, although SDL in virt-manager…
Create /etc/xen/scripts/network-xen-custom with #vi /etc/xen/scripts/network-xen-custom. Copy the script below into /etc/xen/scripts/network-xen-custom. #!/bin/sh # network…
Red Hat Enterprise Linux 4.5 and later have a feature for implementing highly available LVM without CLVM, which is part of GFS.
First create a script file using # vi /etc/xen/scripts/network-xen-custom. Then copy the following text into it: #!/bin/sh # network-xen-custom # Exit if anything goes wrong set -e # F
Installing Windows on Xen under Linux is more involved than with other virtualization systems, because you must check whether the CPU supports operating systems other than Linux through full virtualization…
A fully virtualized Linux guest may frequently hang or use excessive CPU after installation on a virtualization system.
In a guest console, Ctrl + Alt + Del is received by dom0. In RHEL virt-manager, press Ctrl three times, then Alt + Del to send the combination to the guest.
To run Xen in fully virtualized mode on Linux, the CPU must support virtualization technology. Check whether your CPU can run in fully virtualized mode…
Xen in Red Hat 5 does not include guest OS cloning, but guests can be cloned with dd or LVM snapshots. This article covers the snapshot method.
In virtualization environments such as VMware or Xen, the host handles disk access. Setting the guest I/O scheduler to noop lets the host optimize I/O requests.
MS Window 2000 Advance Edition supports only 2 nodes. MS Window 2003 Standard Edition supports 4 nodes, if I remember correctly. MS Window 2003 Enterprise Edition supports 8 nodes, if I remember correctly. Microsoft divides clusters into two types…
Linux Cluster style: 1. High Availability or Fail-Over Cluster. 2. Load balancing Cluster. 1. Linux Cluster: High Availability (HA) or Fail-Over Cluster handles failover when a server goes down.
