April 28, 2015

Migrating emails from one server to another without Server access

Mail Servers,

There are many tools available for this mail to mail migration, here we are going to use "Imapcopy", which I believe to be the best and easy command line tool. It does support both Imap and Imaps protocols. Since this tool only uses 'imap' protocol to copy emails, not much of server resources will be…

Read more
March 11, 2015

Device eth0 does not seem to be present

VMware,

After restoring a VM from datastore or after cloning a centos VM on Vsphere, we see the following error during network restart "Device eth0 does not seem to be present"

Read more
March 10, 2015

Vmware – Unable to operate a ESX host with locked disk

VMware,

Background No operation can be performed on an ESX host and you may see files are locked by other processes.

Read more
February 10, 2015

Integrating Parallels Virtuozzo container in Citrix Xen server

Linux General,

We are trying to install virtuozzo 4.7 in a virtual Machine that has got centos running on it. Virtuozzo installation in this VM goes fine and the VM prompts for reboot post installation. During boot operation, the VM console freezes with lot of errors whereas you can still login to the Virtual machine using putty…

Read more
February 10, 2015

Change VLAN ID using VMware Infra Client or Vsphere client

VMware,

This guide will help you to change the VLAN ID using the VMware Infra Client or Vsphere client. Below are the information that relates to adding and removing VLAN IDs to and from a portgroup, when the following symptoms are observed.

Read more
February 10, 2015

Fixing a corrupt VHD file

Virtualization,

There could be many possible causes why your VHD may become corrupted. More often administrators tend to restore the backup from the snapshot catalog. This is to ensure an uptime guarantee. However, if we have enough time or in the event of not having a snapshot backup our options are very limited. Below are a…

Read more
November 7, 2014

Virtual Machine Cannot Start (Vmware) – ESX/ESXi – 5.0

VMware,

There will be situations where the VM on a host fails to start without showing any progress when the power state is reset. This can be caused by a hung process on the host. Solution: SSH into the host on which the VM is running and run the following commands:

Read more
November 5, 2014

Increase VMware VM performance by placing the Swap file in an alternate location – ESX/ESXi 5.0

VMware,

n this post you will see how to Increase VMware VM performance by placing the Swap file. By default, a swap file is created when a virtual machine is powered ON under a ESXi host. Swap files normally are stored in the same location as in the VM’s configuration file, it could be a VMFS…

Read more
October 3, 2014

Preventing WordPress XML-RPC DDOS Attack

Content management system,

WordPress XML-RPC pingback exploits are used in a number of DDoS attacks in the recent times. WordPress is widely used by many websites that uses a content management system, any vulnerability in the WordPress could compromise the website and break down the Network integrity. Hence it is important to secure and mitigate wordpress websites from…

Read more
July 4, 2014

How to Change the Pool Master in Citrix Xenserver

Cloud Infrastructure,

In Xenserver pooled environment, if the pool master node goes unresponsive due to some reason. We will not be able to access the slave nodes and its corresponding VM's from Xencenter. At this time, if we are able to manually SSH into the pool master. We can execute the following commands to make a slave…

Read more