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Revision as of 23:50, 1 December 2010 by AndrewTridgell (talk | contribs)

Testing against Windows with wintest

wintest is a framework for testing Samba against Windows virtual machines. It aims to provide a reliable, repeatable test system that any Samba developer can setup.

The core of wintest is based on pexpect, a python expect system that provides a flexible way of controlling command line tools.

Some background information on wintest is available in this blog post

Setting up your environment for wintest

To run wintest you need a Linux host that can control Windows VMs. Any scriptable VM system that supports snapshots should work. There are two example config files for wintest, one of them is setup for using VirtualBox, while the other is setup for using virsh to control KVM]. If you build a config for a different VM system, please contribute an example config file.

The current test script can use and test the following VMs:

  • Windows7
  • WindowsXP
  • Windows2003
  • Windows2008
  • Windows2008R2

You don't need to setup all of these VMs to run the test. The script will look for what VMs you have defined in your config file and will only run tests against those VMs.

Setting up a VM

Each of the VMs needs to be setup with the following properties:

  • the telnet server needs to be enabled
  • for VMs that will join Samba as a workstation, netdom.exe needs to be installed
  • for VMs that are DCs, dcdiag.exe needs to be installed
  • the machine needs to have a snapshot with it fully booted

It is also a good idea to do the following:

  • ensure that in the snapshot the machine is activated, and windows update is disabled
  • it is a good idea to disable the firewall, although the script will try to do that if telnet is working

Make sure you test that telnet into the machine works. You may need to add "Authenticated Users" to the TelnetClients group.

Running the tests

You need to run the tests as root. After you have created a config file (based on one of the examples), you should run it like this:

 sudo wintest/ --conf wintest/conf/tridge.conf --rebase

this will run the full set of tests, using the parameters from your config file. See the config file for details on where it gets the source tree from and where it builds it. On my laptop the full test suite currently takes about 30 minutes.

DNS setup

The tests aim to run Samba in a manner as close to real production use as possible. To make this possible, it will modify your /etc/resolv.conf to point at the copy of bind9 it starts. The bind9 config is setup to automatically forward DNS requests for non-wintest hosts to your original nameserver, so it should not impact on normal usage of your machine. The test restores your resolv.conf to its original value when the test is complete.

What is tested?

The main things that are tested are:

  • joining WinXP and Windows7 to a Samba4 domain as member servers
  • joining Windows2003, Windows2008 and Windows2008R2 as DCs in a Samba domain
  • joining Windows2008R2 as a RODC to a Samba domain
  • joining Samba as a DC in a Windows2003, Windows2008 and Windows2008R2 domain
  • joining Samba as a RODC in a Windows2008R2 domain
  • DRS replication between Windows and Samba for all the above DC arrangements
  • dynamic DNS with TSIG/GSS, using bind9

The list is tests is likely to grow rapidly

Samba3 testing

There is a skeleton of a Samba3 test in wintest, but it needs to be developed further. It would be great if someone could volunteer to expand it to be a useful test of Samba3 against Windows.