April 28, 2015
Migrating emails from one server to another without Server access
Mail Servers,Imapcopy: 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…
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March 11, 2015
Device eth0 does not seem to be present
VMware,Issues 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” Cause: After cloning or restore from datastore, the MAC address needs to be edited on the VM configuration settings since the MAC ID tends…
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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. Solution Determine which ESXi/ESX host has a locked or rogue file. * First login to the local tech support mode console on the host. * Use the command vmkfstools to obtain the lockstatus of…
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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…
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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. Loss of network connectivity to and from the host. Loss of connectivity to associated…
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February 10, 2015
Fixing a corrupt VHD file
Virtualization,Error message – Failed to open attachment ‘C:\ vhddir \MyVHD.vhd’. Error: ‘The file or directory is corrupted and unreadable.’” 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…
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November 7, 2014
Virtual Machine Cannot Start (Vmware) – ESX/ESXi – 5.0
VMware,Problem: Virtual Machine Cannot Start (Vmware) – ESX/ESXi – 5.0 Explanation: 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…
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November 5, 2014
Increase VMware VM performance by placing the Swap file in an alternate location – ESX/ESXi 5.0
VMware,In 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…
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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…
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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…
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