windows

Snappy Ubuntu Core on Hyper-V

Do you want to test drive the Snappy ubuntu core on hyper-v? Here are some simple steps.

1. Download the ova file from the official ubuntu website

https://developer.ubuntu.com/en/snappy/start/#ova
http://cloud-images.ubuntu.com/ubuntu-core/15.04/core/stable/current/core-stable-amd64-cloud.ova

2. Use 7-zip (Windows) or tar (Linux) to untar the ova file
3. Use a image file converter (like virtualbox) to convert the vmdk file to vhd file.

e.g. VBoxManage.exe clonemedium core-stable-amd64-cloud-disk1.vmdk core-stable-amd64-cloud-disk1.vhd –format VHD

4. You can use standard cloud-init way to setup the system (not discuss here) or;

5. mount the VHD file in any linux machine, modify the /etc/shadow (in partition 3) to clear the root password;

6. Create a ubuntu-core machine in hyper-v and mount the vhd image.

7. Start the machine and enjoy.

Little Windows Batch to get yyyymmdd (year, month, day of month)

Do you need to write a windows batch and need to get yyyymmdd?  It is a nightmare if you deploy your batch file to multiple machines (e.g. different windows version, different locale setting, etc).

Unlike linux, windows build-in date command will output different format for different Windows version (e.g. xp, 2003, 2012) or different localized version.  And the user can also customize the output format.

In the old days, I’ll write a little program to do this.  But now there is a little tool, yyyymmdd.bat, https://github.com/litalidev/yyyymmdd which seems to work on different Windows versions.

Openwrt in Hyper-V

Want to add a openwrt machine in hyper-v for testing?  Sadly, the openwrt did not include the hyper-v device driver for the network device.

(Un)luckily there is a legacy network driver in hyper-v that can be used in openwrt.

Steps to add openwrt machine inside hyper-v:

  • In hyper-v, add a machine with 64-128MB ram, legacy network device.
  • Copy the openwrt image to the virtual hard disk.
  • Mount the virtual hard disk (mount /dev/sda2 /mnt) and copy the tulip driver to the hard disk.
  • Boot the openwrt machine.
  • Inside the openwrt machine, add the tulip driver (cd /; opkg install kmod-tulip_3.3.8-1_x86.ipk)
  • ifconfig -a to check the name of the network device.
  • Modify /etc/config/network as usual and restart the network (or reboot).