Thursday, 12. February 2009, 03:07:07
At least for myself, it is! I will keep you updated for my status, though I won't update this blog very often.
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Friday, 12. December 2008, 03:04:32
To be done.
Thursday, 18. September 2008, 08:04:19
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Tuesday, 2. September 2008, 03:32:22
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Tuesday, 26. August 2008, 08:43:36
Debian
This is about recompiling kernel, but not only recompiling kernel.
My general way to update my Linux kernel on my distribution would be,
1, go to kernel.org.
2, download whatever version you need.
3, unpack it and make menuconfig.
3.1, or maybe you want to patch something before you really start config.
4, make bzImage && make modules && make modules_install
5, copy your new Linux image to your boot loader recoganized dir.
6, make a initrd image if neccesary.
7, update your boot loader config entry and reboot.
8, pray and then the world becomes a new one.
But now, I want to use the source tree from Debian official releasing rather than the original one, how?
But now, I don't want to touch make or other basic tools, would a decent script help me to finish all above?
We can start from getting Linux source tree from debian.# apt-get install linux-tree-`uname -r`
# here we will take 2.6.18-4 as `uname -r` result for example.You may also need the following packages,
linux-source-2.6.18, kernel-package, make-kpkg, fakeroot. And normally a general patch package is also installed,
linux-patch-debian-2.6.18.
After lots of google work, I have now figured out how is the relationship between linux-tree package and linux-patch package.
linux-patch-debian-2.6.18 contains all the patches made by Debian, and some scripts for applying or unpatching those patches to linux kernel. After installing, the contents are put in
/usr/src/kernel-patches/.
linux-tree-2.6.18 contains the latest kernel source package, after installing you will find the .bz2 file from
/usr/src. Unpack it you will get the source tree.
Tricky:Debian official released kernel version is composed by linux kernel version and patch level, 2.6.18-8 means this linux kernel is based on Linux 2.6.18 and with Debian's patch of level 8.
To find out which version of your linux source tree, navigate to /usr/src/linux-source-2.6.18 (or whereever you unpacked the previous .bz2 file), and 'cat version.Debian'. That might be '2.6.18-6' or something similar, but most probably this will not match with your current running kernel (it might be '2.6.18-4' or else).
Now navigate to '/usr/src/kernel-patches/all/2.6.18/apply' and 'cat debian', from the header part, you can see the capability of this patch set from this line.
_default_revisions = "1 2 3 4 5 6 7 8 9 10"That means by applying this patch to your source tree, you can get the kernel source with different patch level (from 2.6.18-1 to 2.6.18-10). And that would farily easy.
# cd /usr/src/kernel-patches/all/2.6.18/apply && ./debian 2.6.18-9
=> will upgrade your source tree from 2.6.18-8 to 2.6.18-9.# cd /usr/src/kernel-patches/all/2.6.18/apply && ./debian 2.6.18-4
=> will downgrade your source tree to 2.6.18-4, which matches your current running kernel.Tricky end.Till this step, you have got the Debian official released kernel source and can easily change to different patch level.
From next step, you can either use my general way to compile and install kernel imag. Or, you can select to use Debian way to install.1, cd /usr/src/linux-source-2.6.18
2, make menuconfig # Yes, still need this

3, fakeroot make-kpkg clean
4, fakeroot make-kpkg --initrd --revision=custom.1.0 kernel_image
Yes, this is a script, but you difinitely need to read the manual carefully to get what you really want. And hopefully if everything runs well, you will get a .deb file (linux-image-2.6.18_custom.1.0_i386.deb), which is a redistributable kernel package.
5, install your new kernel, of cource to use "
dpkg -i ../linux-image-2.6.18_custom.1.0_i386.deb". And then just reboot, because dpkg will handle all bootloader upgrade stuff.
All done

As an alternative way of using Debian official released kernel source, you can also try to get the preconfigured source package via '
apt-get source linux-major' and follow the guide from
http://kernel-handbook.alioth.debian.org/ch-common-tasks.html, section 4.2.
But this need a valid source apt source. Not tried this yet.
Thursday, 7. August 2008, 10:46:00
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Thursday, 7. August 2008, 07:54:20
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Monday, 9. June 2008, 05:24:42
developement, Linux
Many people don't know how to merge source code under GNU/Linux, and many people are discussing which tool is better under GNU/Linux. Obviously you will have many choices, even more than under Windows.
1, sdiff
2, vimdiff
3, Emacs/Ediff
4, meld
5, kdiff
etc...
And here I'm introducing the very powerful and clear 'Emacs/Ediff' solution. The advantages of using ediff include that can work smoothly both under X and console, integrated with Emacs which you can get benefit from PCL-CVS and give you the ability to merge between 3 files.
Ediff is a buffer type of emacs, to launch ediff you can easily use,
1, M-x ediff-files / M-x ediff-buffers
2, M-x ediff-directories
3, M-x ediff-files3 ...
Select the A target and B target, then you will get the result in two splitted windows.
1, press '|' to change from vertical window layout to horizontal window layout.
2, ediff floating window should be shown and all operation key sequence should go through that window.
3, ? to get help. And I think that help is enough, you don't have to refer to any other docs.
a/b key can easily merge the code from A to B or B to A. Remember to use 'ra' or 'rb' to revert your change, and 'wa' or 'wb' to save corresponding buffer.
In case of comparing directories, your files are treated as sessions. So that you will have a session list buffer and allow you to dispose files one by one.
You may also want to add '-b' option to your diff program when you are working on C/C++ sources. That will igore lines contains only blank difference, space or tabs.
Friday, 30. May 2008, 02:42:36
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Monday, 19. May 2008, 07:25:22
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Monday, 19. May 2008, 07:18:36
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Monday, 19. May 2008, 07:01:55
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Wednesday, 16. April 2008, 09:06:23
sysadmin, IT
The background is that I need to make a rate-limit on a specific port of a Cisco 2950 switch. I approch to google and found some instruction like below,
mls qos
access-list ...
class-map ...
policy-map ...
But the above just doesn't work on my switch. I turned to cisco website and checked out the spec of my switch and found the reason. It turned out that Cisco 2950 with IOS SI (Standard Image) can't support QoS, that can only be done with IOS EI (Enhanced Image). And mine is equipped with SI.
Annoying thing is that there are so many articles talking about how to set QoS on 2950, but almost none of them mentioned abou the IOS version requirement. Crappy!
Thursday, 13. March 2008, 00:05:01
software
Youdao desktop dictionary just released the official version 1.1, which is now working fairly well with Opera.
It's time to uninstall my Xdict 2005, who will translate å å
(cousin) to 'brother-in-law'
Tuesday, 26. February 2008, 07:53:24
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gdb, developing
Normally GDB will stop at any signal receiving event. This becomes very annoying when debug on many specified systems. Some GUI system might use broadcasting signal method to do the IPC. That kind signal will be most probably unuseful for the application you are debugging.
GDB has the method of setting the way of handling signals.
Command: handle
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Thursday, 7. June 2007, 07:11:37
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sysadmin, network
Although including allow-hotplug to /etc/network/interfaces (in addition to auto) will ensure that the network interface is enabled once it becomes available,
Tuesday, 24. April 2007, 15:22:00
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Tuesday, 13. March 2007, 02:12:16
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Wednesday, 14. February 2007, 17:10:29
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Thursday, 7. December 2006, 10:15:20
HAM web
You must have known the common characteristic of those personal home pages made in 1998 or even earlier. Flower background picture, blinking icons, bigger fonts and many gif animations ...
Now actually it is not so difficult to find these old pages online while they are still living.
Followed one of my friend, he visited my blog and commented on my article, home page I got these pages.
http://www.odinn.org/ - Odinn Thor, a HAM from Iceland
http://home.no.net/gerdmhne/ - A norwegian ever visited Odinn
http://personales.ya.com/30sd412/ - another HAM in Turkey
Seems like HAM's web technolodies are quite out of date
Wednesday, 6. December 2006, 13:49:23
opera
Actually it was posted from my Opera mini application on my mobile, which is a Nokia 3230.
The new Opera mini, namely Opera mini 3.0, has that new feature of posting pictures to my opera community, while the picture could be one that you just took with your camera on your phones.
Though the picture is not exciting at all, but for keeping it as a memory, I will not delete it

Shenzhen, 20061206
Wednesday, 6. December 2006, 12:16:04
Wednesday, 22. November 2006, 07:43:19
Debian, Linux
package name is 'sysutils'
Wednesday, 22. November 2006, 03:50:18
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The only fault I made is that, I didn't notice the guy, the traffic police, was standing right there in the corner

... well, forget it, I'm kidding
Tuesday, 21. November 2006, 02:51:59
sysadmin, Linux
The first time I saw somebody was using 'screen', that was Dou Yuan. His opinion is that when somebody connected to a host via network, saying telnet or ssh, 'screen' is the best tool to maintain multiple windows session. While when he login to a host from the console or using X, 'emacs' will take the lead.
So, what is screen?
It is described as 'screen manager with VT100/ANSI terminal emulation' in the man page. My understanding is, screen is a sub-shell which enable you to create multiple virtual screens. You can detach from the screen manager without quiting the sub-shell, surely you can attach back to the sub-shell afterwards. Even after you logout from the shell where you launched screen, the screen manager will continue running from the background and be ready for further attaching. All the sessions and environments will be kept just as the same when you detached, all the tasks and commands will continue running as if you are still playing with the shell. You don't have to worry about the disconnection from the host will interrupt the standard input and output. 'nohup' command seems like not being useful any more.
Particularly when you need to make time consuming operation on a remote host via a slow network connection, 'screen' will most probably be of help on performing this kind of work. For example, you need to transfer a very big file from server 'A' to server 'B' tonight. Assuming there is a ftp server running on 'A', you can connect to 'B', use screen to create a new virtual window, launch 'ftp' command and start the download process, then detach from the screen and disconnect from server 'B' safely.
Go to bed, sleep ... wake up at the morning. Reconnect to server 'B', launch screen and attach to the previous session. You will see the file transfering has been finished. Go on you other works.
However, the above case maybe is not a good example, you may say that to use 'wget -b' or just to write a shell script is a better choice for this task. But that scenario indeed illuminated the common usage of 'screen' anyway.
Basic command for using screen:
To start screen,
$ screen
To create a new virtual window in screen,
Ctrl + a, c
To switch to another virtual window in screen,
Ctrl + a, Ctrl + a
To detach from screen,
Ctrl + a, d
To reattach to existing screen session,
$ screen -r [[pid.]tty[.host]]
Here you can use 'ps -ef' command to get the corresponding 'pid', 'tty' and 'host' info.
For more info regarding on using 'screen', try 'man screen' maybe is a good start. BTW, q quick tip, all screen built-in commands are using 'Ctrl + a' as the prefix. Enjoy!
To all these sysadmins who need to connect to various servers from various places.
Monday, 20. November 2006, 15:15:45
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Thursday, 16. November 2006, 16:27:13
funny
To those who I have not sent the link to, and maybe will find the fun in this amazing flash toy.
http://www.deviantart.com/deviation/40255643/
Friday, 3. November 2006, 11:56:04
GPS, google
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Friday, 3. November 2006, 07:20:26
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Monday, 30. October 2006, 18:57:31
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Monday, 30. October 2006, 18:20:56
eyou, life
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Andï¼we shall overcome. Life was tough ever, we shall overcome someday. We shall overcome today!
Wednesday, 25. October 2006, 08:27:29
misc
1, IT çå大âç¥è¯âãä¼¼ä¹å°è¦è®²è¿°çå
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2, Joan Baez.
ä¼ å¥çç¾å½å¥³ä¹¡æææï¼å
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Thursday, 19. October 2006, 08:55:29
life, çæ´»
ä»å¤©æ©ä¸åå°éä»å½è´¸åºå£åºæ¥ä¹åæ»æ¢¯ï¼æä»å·¦ä¾§çå¿«éééèµ°ä¸å»ï¼å¿«è¦å°é¡¶ç«¯çæ¶ååé¢ç人åäºï¼æä¹éçåäºä¸æ¥ï¼è¿æ¶æåç°äºå¨æå³ä¾§çä¸ä¸ªç·çã
æ£å¨ç¨ææºä¼¸å°åé¢ç«å¨ä»ä¸ä¸ä¸ªå°é¶ç女士çè£åä¸é¢å·æï¼å 为éªå
ç¯éªäºä¸ä¸ï¼æä»¥ææåç°äºã让æé常ææï¼æ è¯å¯è¯´ï¼
æä¸ææä½äºé£ä¸ªç·çè³èï¼æåç°è¿ä¸ªäººå¤§æ¦ä¸åå¤å²ï¼ä¸å¯èåçææ®ï¼æ¢ä¸æ¯å¾æ¶å°ä¹ä¸æ¯å¾åçé£ç§ï¼çèµ·æ¥ä¹ä¸æ¯å¾ç¥çï¼æä¹çæä¹è±¡ä¸ä¸ªèå®äººãèåé¢ç女士墿²¡æä»»ä½å¯è§ï¼å
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æççä¸ç¥éæ¯ä¸æ¯åºè¯¥å«ä½åé¢ç女士ç¶ååè¯å¥¹è¢«å·æäºï¼èè¿ä¸ªç·çå¢ï¼æ¢ä¸è·ä¹ä¸å«ï¼ç¬ç¯ç¯çççæï¼ä¼¼ä¹å¥½åæ¯è·æè¯´ï¼å¥ä»¬è¦ä¸è¦ççææçææï¼
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Sunday, 8. October 2006, 11:21:22
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颿´»éã彿¶è±äº260åå·¦å³ï¼å¯ä»¥è¯´é£åéé常ç»å®ï¼æå¨ååºå°ä¸ç©¿äºå¥½å å¹´ï¼ç´å°ç°å¨è¿æ²¡æå®å
¨åãåªä¸è¿å ä¸ºéæ¬æ¥å°±ç¨å¤§ä¸äºï¼ç°å¨åæäºæ¾æ¾å®å®äºï¼ä¸æ¯å¾èæãåµä¸ï¼å
é¢åéè¿æ¯æè§å¤ªç´¯äºï¼æå没æä»ä¹æºä¼å»ççèåªä¸è¸¢çãæä»¥ï¼è¿æå¯»æçæ¢ä¸åï¼ç»äºï¼å¨èå®¶çMizuno åºä¸å¯»å°èªå·±æ¯è¾åæ¬¢çæ¬¾å¼ï¼330å
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Sunday, 8. October 2006, 04:03:52
GTD, mindmap
Created by Zhanbo (Ray) Xiong, using Freemind.
Refer to
FreeMind website for detail of Freemind.
GTD and Getting Things Done is the registered trademark of
David Allen & Co.
Please post comments here if you are intrested in the original Freemind source file.
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