Archive

Archive for December, 2012

ESXi Host Backup & Restore GUI Utility (PowerCLI based) updated to 1.2

December 29th, 2012 No comments

A quick post today to just mention that I have updated my ESXi 5.0 / 5.1 Host Backup & Restore GUI utility to version 1.2.

 

There are a couple of improvements in 1.2 based on feedback received in the comments I have received about the utility. The main improvement introduces a function in the script which backs the GUI to check that ESX hosts are valid before attempting to backup or restore these. You can check the utility out over on it’s page here.

 

Updates (29-12-2012) – version 1.2:

  • Added ESX/ESXi host validation into utility – will now test that the host is valid and either connected or in maintenance mode before attempting backup or restore (See the script’s new “Check-VMHost” function for those interested)
  • Minor UI improvements

 

Writing files to an NTFS volume in OSX using VMware Fusion

December 24th, 2012 2 comments

This is more of a quick tip than the usual full blog posts I do, but a useful one none the less (at least for me). By default when you plug an NTFS (Windows) volume into an Apple Mac, you are able to read the volume, but not write to it. There are ways to forcefully allow NTFS writes, but for those who do not wish to mess with system settings and are using VMware Fusion, this may come in handy.

  • Make sure your Windows VM is powered on and booted, then your plug external USB drive with the NTFS formatted volume into Mac
  • When prompted, choose to connect the drive to your Windows VM
  • Make sure you have a folder from your Mac shared to your Windows VM (e.g. Documents) through Fusion

 

  • Place any files you would like to write to your NTFS volume in your shared folder on your Mac (e.g. Documents folder)
  • Using your Windows VM, open explorer, navigate to the shared folder presented to Windows via Fusion, find the files you want to copy, and then copy/paste them to your NTFS volume that has been passed through and mounted on your Windows VM
  • As Windows is doing the writing it will of course allow writes to the NTFS volume which has been passed through from the Mac

 

Using plink to modify ESXi host configuration files via SSH from a PowerCLI script

December 17th, 2012 10 comments

I am a big advocate of automation and saving time with a good script. Whenever I can find a task that is fairly lengthy, and is likely to be repeated in future, I always consider scripting it. There are many way to configure an ESXi host when it comes to writing build or automation scripts. In fact, I often feel we are quite spoilt for choice. Here are just some of the tools we have available to use:

  • PowerCLI
  • esxcli
  • vMA
  • vCLI

I was working on a build configuration script the other day using PowerCLI and found the need to edit some configuration files on the hosts. I wanted to edit the configuration file /etc/vmware/config during the execution of a single PowerCLI script without needing to stop the script or have an additional step to do myself. The following is what I came up with to achieve this:

  • Configure host as normal using PowerCLI
  • Use PowerCLI to start SSH service on host
  • execute plink script to connect to host, run command via SSH, then disconnect
  • Use PowerCLI to stop SSH service on host
  • Continue with rest of PowerCLI script

 

Plink is a command line connection tool – essentially a command line version of PuTTy. You can call it from dos prompt and issue it with a single, (or list) of commands to run once connected to a specified host. You can download Plink over here.

 

So without further ado, let’s take a look at the script as I described above.

# At start of our script we ask for the host's IP or name (this could be automated if you like)
$hostIP = Read-Host "Enter ESX host IP/dns name: "
$vmhost = Get-VMHost $hostIP

# Start the SSH service
$sshService = Get-VmHostService -VMHost $vmhost | Where { $_.Key -eq “TSM-SSH”}
Start-VMHostService -HostService $sshService -Confirm:$false

# Use SSH / plink to configure host with some additional script
cmd /c "plink.exe -ssh -pw HOSTROOTPASSWORD -noagent -m commands.txt root@$hostIP"

# Stop SSH service
Stop-VMHostService -HostService $sshService -Confirm:$false

 

As you can see, we start off by asking for the host IP or name, this is the only bit of manual input, but even this could be automated. The script then finds the SSH service on the host, and starts it. After this, the script calls the plink.exe file via cmd /c and connects using the root user@ the host’s IP as we entered at the beginning of the script over SSH. Plink is pointed to a commands.txt file (previously placed in the script execution folder), which contains the actual lines of bash script to be executed on the ESXi host via SSH.

Here is the content of the commands.txt file that I refer plink.exe to use (as an example, this bit of script enables copy/paste operations on all VMs running on this host in the guest OS’ console, as per VMware KB 1026437), but could contain any other commands you wish to execute on the ESXi host over SSH.

echo 'isolation.tools.copy.disable="FALSE"' >> /etc/vmware/config
echo 'isolation.tools.paste.disable="FALSE"' >> /etc/vmware/config

 

* Note two very useful techniques show by Alan in the comments section below, showing how to automatically download plink.exe if it is not available when the script is run, and also how to accept the SSH fingerprint key request by piping Y to plink.exe via the script – check out Alan’s blog post here for more detail.

vExpert spotlight

December 6th, 2012 No comments

 

The vExpert title is given out to those who have provided a significant contribution to the VMware community over the previous year. Individuals lucky enough to be awarded this title may receive it for a number of different reasons. For the 2012 title, there were three paths possible to become a vExpert.

  • Evangelist path
  • Customer path
  • VPN (VMware Partner Network) path

Having created and run Shogan.tech over the last four and half years or so, providing content to the community around VMware, automation, and scripting (as well as a couple of small little utilities), I was lucky enough to receive the title on the evangelist path this year.

Gregg Robertson (from thesaffageek.com) has kindly been helping out with organising and publishing the vExpert spotlight entries. After finally managing to find a bit of time, I managed to get my entry together a few weeks ago and submitted it. It has just been posted up on the VMware VMTN blog: http://blogs.vmware.com/vmtn/2012/12/vexpert-spotlight-sean-duffy.html