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All posts for the month July, 2013

I’ve been testing out Server 2012 and at one occasion I wanted to install WSUS role on my test server. The installation went smoothly but the post install configuration failed miserably with cryptic errors in the setup log.
I tried with many things suggested on the net… Both with internal and external database, but always failed.

One solution that worked for me is doing a manual installation and performing the post installation configuration with PowerShell. How the heck does this makes a difference – ask Microsoft.

Here is how to install WSUS with external database. I already installed SQLExpress on the machine so why not use it 🙂

Install-WindowsFeature -Name UpdateServices-Services,UpdateServices-DB -IncludeManagementTools

Running post installation configuration form PowerShell (wsusutil.exe is at C:\Program Files\Update Services\Tools):

.\wsusutil.exe postinstall SQL_INSTANCE_NAME="HOSTNAME\SQLEXPRESS" CONTENT_DIR=C:\WSUS

For those interested to use Windows Internal Database, just run:

Install-WindowsFeature -Name UpdateServices -IncludeManagementTools

As same as before, after installation run post install configuration by issuing:

.\wsusutil.exe postinstall CONTENT_DIR=C:\WSUS

Of course replace “HOSTNAME\SQLEXPRESS” with your DB instance, and path to your content dir.

Few days ago there was a sale on Namecheap.com and i got a domain for a 0.89$. Mostly because DynDns.com has drastically shrunk canceled  their free services, I wanted it for personal use for my home machine that gets IP dynamically. Since I’m a fan of DD-WRT and have been using it for quite a while on my home router, I wanted it to update my DNS record when its IP changes. Out of the box DD-WRT doesn’t support Namecheap’s DDNS service but can be customized to work with it.

After an hour or so of testing and googling, here is the only configuration that i managed to get working on latest release of DD-WRT v24-sp2 (05/27/13) std (SVN revision 21676).

DDNS Service: Custom
DYNDNS Server: dynamicdns.park-your-domain.com
Username: yourdomain.com
Password: password you got from namecheap ddns service
Hostname: hostname or enter @ if you want to point directly to your domain

URL: /update?domain=yourdomain.com&password=1111111111111111111&host=

Note: Don’t enter anything after &host= even if you have a subdomain.

Capture

One of our lab networks has access to internet only through SOCKS proxy provided by our contractor. That works fine in most cases, but not for OpenSUSE’s package manager (zypper) since there is practically no support for SOCKS proxies .

One easy and fast workaround is to setup a local HTTP proxy server that will redirect all traffic to specified parent SOCKS proxy. From what I’ve read, Squid doesn’t support SOCKS proxy parent, and honestly i didn’t want to go with it as it seemed like an overkill.

Simple solution was Polipo; small, fast and easy to setup proxy server that supports SOCKS parent proxy. RPM package was already available in SUSE’s repository, downloaded it on another machine, SCPed it to a OpenSUSE box, set a few things and viola.

For the quickest and simplest setup i added these three parameters in /etc/polipo/config file.

daemonise = true
socksParentProxy = "proxy.hostname.or.ip:proxyport"
socksProxyType = socks5

Run polipo. Optionally you can add Polipo to Cron so it will start with the system.

 

Few days ago I installed Hyper-V Server 2012, Microsoft’s free virtualization platform and the equivalent of VMware ESXi.
The very first thing that I was stuck with is that Hyper-V Manager available through RSAT doesn’t have an option to mount an ISO or capture a drive from a machine on which is running. Instead it gives you drives of the Hyper-V host, and that would of course require you to have an ISO or the disc itself present on the host.

For most of us this is very inconvenient, we like the ability to mount an ISO from a network share or our machine. One would think, this a Windows box, no problem, i will map a network drive with my ISOs. The mapping would succeed, but mapped drive (letter) will not be visible in Hyper-V manager when trying to mount an ISO. Ok, the next step that the one would consider is mounting from UNC share directly, but that would also fail, with the message “‘VM’ failed to add device ‘Virtual CD/DVD Disk'” & “User account does not have permission required to open attachment”.

hyperv1

The cause of this is that the Hyper-V is intended to run with VMM Library Server and to mount files from it, not any random share. To circumvent this:

  • You need to assign full NTFS and share permissions to computer account of Hyper-V on a shared folder with ISO’s you want to mount.
  • In AD on the computer account of Hyper-v machine delegate specific service ‘cifs’ to the machine you want your ISO’s mounted from, microsoft calls this constrained delegation.

Here is step by step procedure for the constrained delegation:

  1. Go to Active Directory Users and Computers
  2. Find the Hyper-V server computer account and open up its properties.
  3. Go to Delegation tab.
  4. Select Trust this computer for delegation to the specified services only radio button.
  5. Click the Add button.
  6. Click the Users or Computers… button.
  7. In the Add Services window, click Users or Computers and enter the computer account that will  act as a library server and click OK.
  8. Select the cifs Service Type and click OK.

The resulting setup should look something like this:

Constrained delegation

You could reboot the Hyper-V server just for the good measure.