PuTTY is a terminal emulator. The client part supports the protocols:

• SSH
• Telnet
• rlogin
• TCP crude

This is Free Software released under the MIT license. Its main features are:

• Retains the settings of the hosts and their preferences for future use.
• Control the encryption key and the version of the SSH protocol.
• It includes an SFTP client command line called psftp.
• It includes an SCP client command line called pscp.
• Allows control of the port translation (port forwarding) on ​​SSH dynamic local and remote.
• Supports IPv6.
• Supports encryption 3DES, AES, Arcfour, Blowfish, DES.
• Supports public key authentication.
• Supports Telnet, SSH, and rlogin, and RS-232.
• There is a command line version called Plink.
• No installation is necessary; simply run the downloaded executable to use.

PuTTY does not generate backup file for the parameters. These are stored in the register at the hive:

“HKEY_CURRENT_USER \ Software \ SimonTatham \ PuTTY \ Sessions”

ESX Server may not want to load its operating system if it was abruptly stopped or has crashed. It usually returns the following error message:

“Kernel Panic: VFS unable to mount :: root fs on 0:00”

To correct this problem, please follow the following procedure:

For ESX 3.x

• Restart the server
• Select “Console-mode service troubleshooting” The GRUB boot
• Connect with the user account root
• Enter the command ” esxcfg-boot-p” To update the PCI settings
• Enter the command ” esxcfg-boot-b” To update the startup parameters
• Enter the command ” esxcfg-boot-r” To update the boot files
• Restart the server with the command ” shutdown-r 0 »
• Choose a classic start (default)

For ESX 4.x

• Restart the server
• Select “Troubleshooting User” The GRUB boot
• Connect with the user account root
• Enter the command “esxcfg-boot-b” To update the startup parameters
• Restart the server with the command ” shutdown-r 0 »
• Choose a classic start (default)

An open source bases e-commerce application which can be integrated with the latest technology of cloud computing and server hosting services. You can install Magento through shell or administrator access on your virtual machine. It can also be installed with various other installation scripts provided by hosting providers. We, at bodhost offer free installation of Magento on our new variant of hosting technology – eNlight Cloud hosting services.

If you are running an e-commerce website and require Magento, you can easily install on a cloud platform.

At the time of deleting a snapshot from any of the virtual machines automatically deletes from the GUI, but it does not merge into the parent VHD till the VM is off and merge completes. This can cause a major issue if you run out of space and .AVHD keeps increasing. Due to insufficient space to merge the snap-shot, VM will automatically pause.

The only solution to this is monitoring the pending deleted merges by monitoring the following entry in the config file of each Hyper-V VM :

configuration/global_settings/disk_merge_pending = true

Let’s analyze them one by one :

a. 0x800704C8 : Requested operation cannot be performed on a file with a user-mapped section open
b. 0×80070037 : Failed to Power On with Error ‘The specified network resource or device is no longer available.’
c. 0x800703E3 : I/O operation aborted because of thread exit or application request

Thes issues can be caused by an Anti-virus software installed in the parent partition and real-time scanning component configured to monitor the Virtual Machine Files

If you haven’t planned your server performance, you will definitely need to re-consider your RAM allocations. In short, a fixed virtual disk is faster than a dynamic virtual disk. Make sure that integration services are already installed in the VM.

If you are seeing this error, you need to check the permissions on the .vhd, .avhd or .xml file

To understand, it is caused due to mis-configuration between the VLAN ID used by virtual machine and VLAD ID configured on the phydical network switch. You can solve it by configuring the virtual machine to re-configure the VLAN

The error is mainly caused by a bug or as Intel calls it “erratum” which generates multiple interruptions.

Just for a testing purpose I used Xen almost a year to consolidate my dedicated server, initially dual core and now quad core. First I used Xen VM migration feature which was allowed me to have a separate solution on a server to use DEV. After switching to Core2Duo, I took an advantage of virtualization for consolidation and disconnected the the four large machines that are now just more than a small NAS.

Recently, I decided to upgrade to a Core2Quad before the technology changed. Even though the principle defined for motherboard / cpu to 45nm demands high end servers.

During this change of hardware, I didn’t really expect that at one stage I will have to abandon Xen. Actually, while installing an OpenSuse 11.3, I found myself on a completely unstable system under Xen ( without VM ) which crashed when tens or hundreds of data have been transformed over the network. So finally I opted a more revolutionary solution – qemu-kvm hypervisor, based on its classic nature.

The migration wasn’t too difficult, as Xen & KVM work with a logical drive in a file. So I’ve had to modify the kernel to include a core as a “default” to reboot the system under qemu. In addition, using YaST tools to manage these Vms were simple and easy to use to create an example of VM description in XML format.

Since all of my VM work properly, what I’ve noticed, the configuration options in KVM are somewhat richer than that of Xen. By the way, all these tests tell me that a kernel module should be addressed in KVM, because Xen already shows a certain lack of stability and its implementation is also more complex than KVM.