VMware Host Client (HTML5 based Web-Client) on Android

vmware-esxi-host-client-on-androidThe VMware Host Client is a HTML5 client that is used to connect to and manage single ESXi hosts without a vCenter Server. The Host client was initially created as a Fling, but made it to a supported component of vSphere 6.0 Update 2.

No Flash, no Windows-based C# Client – Shouldn’t it work on Android based smartphones and tablets? I’ve tried to manage a standalone Homelab ESXi Host with the Web-based Host Client and it works quite nice (with some tweaking).

Of Course, it’s not suitable for large platforms, as the vCenter Web-Client is still Flash based.

This the the Virtual Machine view on my 8″ Android tablet, without any modification. Looks okay, works but I’m not really happy with the layout as there are annoying tabs and the address bar. The whole site is non-zoomable and above the browser viewport:

Most pages are working, and for some the vertical view looks better. Performance Charts and configuration changes are not a problem:
vmware-host-client-performance  vmware-host-client-new-portgroup

However, I want to optimize it for my tablet/smartphone by removing the address bar and making it zoomable. To achieve this, I’ve investigated the source code.

In the head I’ve found the following meta tags:

 <!-- The initial, max and min scale, values are needed due to what appears
 to be a bug in iOS 9. We should be able to remove those once that bug
 is addressed by Apple. See https://forums.developer.apple.com/thread/13510 -->
 <meta name="viewport" content="
 user-scalable=yes" />

 <!-- The following will hide the chrome on mobile Safari if the user has
 added a shortcut to their home screen, this is currently
 broken on iOS 9, awaiting a fix from Apple.
 See https://forums.developer.apple.com/thread/9819 -->
 <meta name="apple-mobile-web-app-capable" content="yes" />
 <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />

Well…looks like Apple products are common at VMware. I’m also a little bit confused why they set the minimum and maximum scale to one, and making it “user-scalable”. Doesn’t make any sense to me. Also the android supported “mobile-capable” meta tags are missing.

[Unsupported Part starts here. Don’t do this in production!]

I’ve replaced the odd vieport tag and added another tag for better Android support:

 <meta name="viewport" content="width=device-width, initial-scale=1.0001, minimum-scale=0.5001, maximum-scale=5.0001, user-scalable=yes" />
 <meta name="mobile-web-app-capable" content="yes">

The file that needs to be edited is located here (Requires to SSH to the ESXi Host):


The file is read-only and can’t be edited. Any changes are blocked with the error message:

“index.html” Operation not permitted

Not sure what kind of lock this is (and no chattr on ESXi), but there is an easy workaround:

cd /usr/lib/vmware/hostd/docroot/ui/
mv index.html index.old
cp index.old index.html

You can now edit index.html and replace the meta tags in the <head> tag. The file should look like this:

To make the new index.html persistent after a reboot, change the ESXi bootbank:

cd /tmp 
mkdir esx_ui
cd esx_ui
vmtar -x /bootbank/esx_ui.v00 -o esx_ui.tar 
tar xvf esx_ui.tar
rm esx_ui.tar
vi usr/lib/vmware/hostd/docroot/ui/index.html (Make changes!)
tar cvf esx_ui.tar usr
vmtar -c esx_ui.tar -o esx_ui.vgz 
mv esx_ui.vgz /bootbank/esx_ui.v00

That’s it on the ESXi Host. The page is now zoomable, the width should fit to most devices and it is “mobile-capable”. To get a browser without Tabs/Adress bar in Android, a little trick is required:

  1. Open Host Client in Chrome
  2. Options -> Add to Homescreen
  3. Open the Host Client with the link on the Homescreeen
  4. Browser is now in “App-Mode” (No Tabs/Address bar)

Here are some screenshots from my Android-based tablet:


And the smartphone (HTC One) view:



  1. Etienne Le Sueur

    Hi Florian,

    Thanks for the blog post, and you’re right, I didn’t have a chance to test on an Android tablet, only iPads of various sizes (can you tell I’m an Apple nerd?). The lack of Android support was mostly a time issue, not that I have anything against Android tablets ;-)

    FWIW, I have updated the viewport config because iOS 9.3 will have the issues (described in the comments) fixed and I expect that it will be released pretty soon… Is user scalability important? I don’t know… Probably for small devices like phones, the UI needs to be completely rethought. For iPads and larger tablets, being able to pinch to zoom or double-tap to zoom might be useful…

    I have added the mobile-web-app-capable tag as well.

    The next Fling version will have these fixes (probably next week), we haven’t yet decided on a date for the next official release.

    • Hi and thanky for your comment.
      I don’t think that it is really necessary to have a fully-features web client optimized for small devices. Considering how hard it is to make websites responsive and “good looking” on all screen sizes, including “fake” sizes by mobile browsers seems to be far beyond the benefit. Who manages an enterprise vSphere Platform with a smartphone?

      I changed the Host Client to a flexible vieport to make the width aligned to the display. Why not user scalable? I can zoom in when I can’t read, and I can zoom out to see more information.

  2. Will this work on stand alone installs using the FREE license, or is it only for people that pay the mula? I’d love to ditch the C# client.

    • Yes, the HTML5 Host Client works with the free license too.
      There was a known issue with the Fling (“On ESXi hosts which are assigned a VMware vSphere Hypervisor license, all modification operations will fail silently. We are working on a solution to this issue.”), but the version packaged with 6.0u2 does not have this limitation.

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