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virtual machines

Vmware server comes with the nifty vmware-cmd utility. It allows an administrator to perform various operations on a virtual machine from Linux command line / shell prompt such as:

=> Stop / Start VM

=> Get VM status

=> Setup variables

=> Powerdown VM and much more

Task: Lists the virtual machines on the local server

You can list all servers and config file, enter:
# vmware-cmd -l
Output:

/nas/vms/Ubuntu/Ubuntu.vmx
/nas/vms/FreeBSD/FreeBSD.vmx
/nas/vms/OpenBSD/OpenBSD.vmx
/nas/vms/Debian4/Debian4.vmx
/nas/vms/CentOS5/CentOS5.vmx

Turn on VM / Power up VPS

Just pas start option to vmware-cmd,
# vmware-cmd /nas/vms/FreeBSD/FreeBSD.vmx start

To stop VM/VPS, enter:
# vmware-cmd /nas/vms/FreeBSD/FreeBSD.vmx stop

To reset VM/VPS, enter:
# vmware-cmd /nas/vms/FreeBSD/FreeBSD.vmx reset

To suspend VM/VPS, enter:
# vmware-cmd /nas/vms/FreeBSD/FreeBSD.vmx suspend

Find out if OpenBSD VM is on or off:
# vmware-cmd /disk2.vmware/vms/OpenBSD/OpenBSD.vmx getstate
Output:

getstate() = off

vmware-cmd offers other options, please consult VMWARE documentation for more information.

What Is /dev/shm And Its Practical Usage

/dev/shm is nothing but implementation of traditional shared memory concept. It is an efficient means of passing data between programs. One program will create a memory portion, which other processes (if permitted) can access. This will result into speeding up things on Linux.
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