PingBacks To Come To Wikidot

06 Jun 2008 15:52

I'm currently working on PingBack implementation (both server and client) for current Wikidot software.

The documentation for PingBack is located here:

The changes will be available on the wiki farm and will be incorporated in the open-sourced version

We've noticed there are many posts on Wordpress about Wikidot, bunch of them:

and we want to make a smart move to let people from both services (and many more) know what happens on the other.

PingBack is also known to work for many many other services than just WordPress.

Comments: 1

Ubuntu Server 7.10 Wikidot Clean Install

12 Mar 2008 21:10

After creating-a-space-for-virtual-machines-host it's time to prepare a very first productional Wikidot installation on a virtual disk image.

The problems I've encountered:

1. Compiling the PCRE not gave me the expected results (using heap for recursion matches).

More to come…

Comments: 1

Creating a space for Virtual Machines host

11 Mar 2008 22:43

Look at this:

We want to make some Virtual hosting

I prepare the environment for it.

At first, it'll be the same server like the In order to install VirtualBox i needed to:

yum install SDL.x86_64
yum install qt.x86_64
rpm -ihv VirtualBox-1.5.6_28266_rhel5-1.x86_64.rpm
(got from here:
/etc/init.d/vboxdrv setup

I added user vbuser with

  • the group vboxusers (added by the RPM installation) — group of users that can run VirtualBox
  • home: /vol/disk1/home-vbuser
  • /home/vbuser links to /vol/disk1/home-vbuser

I started the VNC session with some gnome-panel and metacity for the user.

To do this again (in order one killed that) do:


To stop:

killall Xvnc (this will probably kill all running virtual machines).

To connect to it just forward 5903 (this is :3 session of VNC) to localhost, in ssh:
ssh -L 5903:localhost:5903

and connect with a VNC client to the localhost:3

this way you don't transfer the plain password via the network. (the plain password goes through the SSH tunnel).

I created some test machine with a UbuntuServer on it (version 7.10 Gutsy Gibbon i386!!) and needed pkgs for (and the source from svn).

  • RAM: 750MB
  • disk: 20 GB auto-resize, LVM, guided partition scheme
  • network: NAT — change to tun interface


This does not work out of the box, we must exchange the kernel like described here:

Rescue the system, go to sheel and then:
mount /boot
apt-get remove linux-server
apt-get install linux-generic

then boot from the disk and press ESC when GRUB boots, select generic.


install OSE version.

Comments: 1

Snapshots Of Filesystems Under Linux

07 Mar 2008 21:47

Today I've learnt about making snapshots of regular filesystems in Linux.

First of all, this is a link to the article I've found and seems to be quite OK:

The idea is simple. We have to:

  1. Have LVM partition
  2. Set up some (I believe this is not limited to standard ext3) partitions on it
  3. Prepare some place for backups (over network or on a separate disk)
  4. Then at any time, we can just create a snapshot - this does not really consume MUCH resources — but consumes SOME.
  5. This takes not more than 1 second and creates a device/file/something that is an image of the filesystem in the exact moment of creating the snapshot.
  6. Having the image (snapshot) we can do anything with it (like with a block device) — mount (and backup the files), create a raw-copy, export to another machine, clone, whatever.


  • The author believes one can safely restore a backup without even restarting services.
    • Will we need to rely on this? 60 seconds of down-time is acceptable and guaranties that nothing bad happens.

Comments: 1

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