Tech – Page 21 – jonamiki.com

July 2, 2015November 21, 2018

Some basic XenServer VM management from the CLI / command line

List some VMs we care about:
================================================

xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n

Take snapshot of the VMs
================================================

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`; do echo "Snapshotting $i"; xe vm-snapshot new-name-label="BASE vGPU IMAGE" vm=$i; done

Start the VMs
================================================

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`; do echo $i; xe vm-start vm=$i; done

Stop the VMs
================================================

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`; do echo $i; xe vm-shutdown vm=$i; done

Shutdown – Take snapshot – Start sequence:
================================================
On one line:

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`; do xe vm-shutdown vm=$i; echo "Snapshotting $i"; xe vm-snapshot new-name-label="BASE vGPU IMAGE" vm=$i; xe vm-start vm=$i; done

For use in a short shell script (prettier formatting):

#!/bin/sh

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`
do 
    xe vm-shutdown vm=$i
    echo "Snapshotting $i"
    xe vm-snapshot new-name-label="BASE vGPU IMAGE" vm=$i
    xe vm-start vm=$i
done

Import VMs from directory:
================================================

for i in *.bkp; do xe vm-import filename=$i sr-uuid=`pvscan | grep Local | awk '{print $4}' | sed 's/-/ /' | awk '{print $2}'` preserve=true; done

Export VMs to current directory:
================================================

for i in `xe vm-list | grep na | grep -v Xen | awk '{print $4}' | sort -n`;do echo $i; xe vm-export filename=$i.bkp vm=$i; done

July 2, 2015January 26, 2018

Error when installing the vSphere6.0 appliance: The file D:\vcsa-setup.html is not in a folder shared with the host and cannot be opened by the host.

When trying to launch the vSphere6.0 appliance installer I just got the following “The file D:\vcsa-setup.html is not in a folder shared with the host and cannot be opened by the host.”

After having tried and received the same error after copying the ISO locally, emptying the contents into a folder, mounting it via vCenter5.5 to my VM, etc I simply dragged and dropped the file onto Firefox. That was it – it works.

Funny how these simple things can end up wasting time …

May 17, 2015November 21, 2018

Mount encrypted QNAP disk (crypto_LUKS) on an external computer

If one attempts to mount a QNAP disk encrypted with LUKS without unlocking it first, the following error will be shown:
[code]mount: unknown filesystem type 'crypto_LUKS'

To mount and read data from a disk encrypted with crypto_LUKS (for example from a QNAP backup), use cryptsetup as per the below:

Install cryptsetup if not already installed:

sudo apt-get install cryptsetup

Unlock the disk (in this case /dev/sdb1 – adjust based on the device you wish to unlock). Select a good name for the unlocked disk. In this case we use “cryptodisk” but any name will work:

sudo cryptsetup luksOpen /dev/sdb1 cryptodisk
Enter passphrase for /dev/sdb1:

The disk will be listed under /dev/mapper/. In this case /dev/mapper/cryptodisk:

sudo mount /dev/mapper/cryptodisk /home/user/mount/usb/

Now data can be accessed as normal via the mount point /home/user/mount/usb/

To unmount, do the following:

sudo umount /home/user/mount/usb

Finally lock the disk:
sudo cryptsetup luksClose cryptodisk[/code]




		
		Posted on May 16, 2015November 21, 2018
Stopping X windows / dropping to single-user mode
	


	
	
		Installing the NVIDIA driver on Linux requires dropping to a command prompt without X windows running in the background.
Switch to root user:

su -
Password:

Stop the window manager:

/etc/init.d/gdm3 stop

After this X windows will stop and a command prompt will be displayed. The option to enter the root password will be given. Enter it and then install the driver as root. To install the driver, do one of the following:
Option 1: 

sh ./NVIDIA-Linux-x86_64-346.72.run

Option 2:

chmod 755 NVIDIA-Linux-x86_64-346.72.run
./NVIDIA-Linux-x86_64-346.72.run

When done, start X windows again with:

/etc/init.d/gdm3 start
	


	



		
		Posted on April 10, 2015November 21, 2018
Connect ISO file to server using RACADM
	


			
			
							
		

	
	
		Using VNC to connect to the iDRAC of a server is a great way to avoid Oracles eternal Java upgrades, security flaws, etc. At the other hand the Java viewer allows for mapping of ISO files when installing the server OS. That’s not an option with VNC, so what to do? Easy: Launch the VNC session and map the ISO file separately from the command line:
Check status of virtual media:

C:\Users\jonas>racadm -r 192.168.0.120 -u root -p calvin remoteimage -s
Remote File Share is Disabled
UserName
Password
ShareName

Mount the image:

C:\Users\jonas>racadm -r 192.168.0.120 -u root -p calvin remoteimage -c -u user@domain.local -p demo -l //192.168.0.121/ISO/MSDN/Win2012R2-JP-EVAL.ISO
Remote Image is now Configured

Verify that the image is connected:

C:\Users\jonas>racadm -r 192.168.0.120 -u root -p calvin remoteimage -s
Remote File Share is Enabled
UserName
Password
ShareName //192.168.0.121/ISO/MSDN/Win2012R2-JP-EVAL.ISO

Disconnect the image:

C:\Users\jonas>racadm -r 192.168.0.120 -u root -p calvin remoteimage -d
Disable Remote File Started. Please check status using -s
option to know Remote File Share is ENABLED or DISABLED.

	


	


	
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