I wrote a small game in the last few days. The game is called IGot24.
The idea is to use 4 basic arithmetic operations to get result 24 from 4 randomly drawn cards. I talked about the algorithm and python implementation in an old post. In fact, it's currently the first result on Google for "calculate 24".
The game is at:
http://calculate24.appspot.com/
I first wrote the game using pure JavaScript. Later I thought whoever play it may want to get solutions. So I created the backend with Google AppEngine that supply cards and solutions. Then I added a few more options, like getting only solvable cards, disabling timer, calculate 42 instead of 24, etc.
The heart of the JavaScript code is a finite state machine. At first I just coded away thinking it'll be simple, then gradually realized there're more states. I then drew a state diagram and found out there were 21 states! They are all branches, there's no loopback, so I don't think they can be optimized. (Maybe they can, but I don't want to re-read my circuit design book from ages ago to find out)
I think the game can be easily re-done in flash using Flex, since JavaScript can be ported to AS3. It can be ported to IPhone too but it will be waste of time and money (to buy a mac to do iphone dev) because I found a "calculating 24" iphone app got downloaded a whopping 12 times.
11/26/09
11/21/09
Chrome OS on Xen HVM
Google announced open-source Chromium OS 2 days ago. today I tried to build it on a Ubuntu virtual machine. But I failed, had numerous problems I won't elaborate. I will try again sometime later.
I searched web and found a VMWare virtual disk of ChromeOS here. So I downloaded it.
Not wanting to install VMWare, I converted it to a raw disk image and loaded it to XEN with HVM, it worked. But it basically unusable for me mainly because of mouse movement was too slow. I will try with a different vnc client later to see if it improves.
Here's how to convert vmdk image to raw:
$qemu-img convert -f vmdk chrome-os-0.4.22.8-gdgt.vmdk -O raw chrome-os.img
Then just specify the image file in 'disk' line of domain config file, like:
disk = [ 'file:/root/chrome-os.img,hda,w' ]
Here's screenshot of chrome OS:
Here's chrome OS login screen, I have a Fedora 12 hvm domain and a Ubuntu 9.04 32bit domainU also running on this machine. The domain0 itself is Fedora 12 64bit with pvops kernel 2.6.31.6.
I had to use standard VGA driver(stdvga=1), the default Cirrus Logic driver give me a screen like this after I login:
I searched web and found a VMWare virtual disk of ChromeOS here. So I downloaded it.
Not wanting to install VMWare, I converted it to a raw disk image and loaded it to XEN with HVM, it worked. But it basically unusable for me mainly because of mouse movement was too slow. I will try with a different vnc client later to see if it improves.
Here's how to convert vmdk image to raw:
$qemu-img convert -f vmdk chrome-os-0.4.22.8-gdgt.vmdk -O raw chrome-os.img
Then just specify the image file in 'disk' line of domain config file, like:
disk = [ 'file:/root/chrome-os.img,hda,w' ]
Here's screenshot of chrome OS:
Here's chrome OS login screen, I have a Fedora 12 hvm domain and a Ubuntu 9.04 32bit domainU also running on this machine. The domain0 itself is Fedora 12 64bit with pvops kernel 2.6.31.6.
I had to use standard VGA driver(stdvga=1), the default Cirrus Logic driver give me a screen like this after I login:
10/27/09
POC: online barcode qrcode scan with webcam
This is proof of concept(POC). The idea is to scan rebates, coupons, tickets etc. in the forms of barcode and qr-code using your web-cam.
Such an idea is really nothing new. With cellphone, you can now scan the barcode when you pick up an item in store, and get price information on whether it is cheaper at nearby stores or online. Also barcodes on cellphone can now be used for mobile ticketing.
But I have not heard a lot about scanning rebates/coupons/tickets with webcam online. So I created this POC project.
Screenshot:
It somewhat works. QR-code works consistently but most of times the program can not read UPC and code 128. I am sure with some added backend photo processing, I can improve the result, but I doubt it will help a lot. Two of my 3 webcams have a focal length that make it impossible to snap a clear code image, unless of course the image is real large like 400x400 or 500x500px. So I guesstimate most webcams are not suited code scanning?
Here's actual page in a iframe:
The frontend is build with Flex SDK. The webcam code come straight from here.
The backend is using Zxing.
The QRcode test sample is generated from here with google chart api.
Such an idea is really nothing new. With cellphone, you can now scan the barcode when you pick up an item in store, and get price information on whether it is cheaper at nearby stores or online. Also barcodes on cellphone can now be used for mobile ticketing.
But I have not heard a lot about scanning rebates/coupons/tickets with webcam online. So I created this POC project.
Screenshot:
It somewhat works. QR-code works consistently but most of times the program can not read UPC and code 128. I am sure with some added backend photo processing, I can improve the result, but I doubt it will help a lot. Two of my 3 webcams have a focal length that make it impossible to snap a clear code image, unless of course the image is real large like 400x400 or 500x500px. So I guesstimate most webcams are not suited code scanning?
Here's actual page in a iframe:
The frontend is build with Flex SDK. The webcam code come straight from here.
The backend is using Zxing.
The QRcode test sample is generated from here with google chart api.
9/2/09
JW media player with lyrics scroller
Yesterday, I made a lyrics scroller. The thing works, but it's missing quite a few things, like, progress bar, seek, time display, volume control, videos.
So today I made a new one, this time using jw media player. JW media player is a full featured web media player. It has almost everything. Now it has a lyrics scroller;)
Below is a demo, it's a iframe of this page.
Usage:
Include 4 javascript files in the html header:
jquery.js, jquery.scrollTo-1.4.2-min.js, swfobject.js, jwplrc.js
Then put these javascript code in html:
The "file" flashvar can be used to specify a media file such as mp3 or a playlist xml file.
If it's a single media file, you need to specify "lrc" flashvar to tell the player where lrc file is. (update on 1/18/10)It can be in your web directory or anywhere on the web.
if it's a playlist, no "lrc" flashvar is needed. You imply that lrc and media are at
same location/directory, and lrc and media have the same filename. If it's a playlist, you need to specify lrc file in "<info> </info>" inside playlist xml file. The media files can be anywhere on the web, but lrc files has to be on your own site.
"create_jwplrc" is just a wrapper function that wraps "swfobject.embedSWF". The first argument for create_jwplrc is the id of a "<div>" that will be the player, 2nd/3rd are width and height, 4th is flashvars, 5th is parameters, it can be empty {}. The 6th argument is a unique name for the player.
File download wensheng.com/code/jwlyrics.tgz (updated 1/18/10)
So today I made a new one, this time using jw media player. JW media player is a full featured web media player. It has almost everything. Now it has a lyrics scroller;)
Below is a demo, it's a iframe of this page.
Usage:
Include 4 javascript files in the html header:
jquery.js, jquery.scrollTo-1.4.2-min.js, swfobject.js, jwplrc.js
Then put these javascript code in html:
var flashvars = {
file:"somesong.mp3",
lrc:"somelrc.lrc"
};
create_jwplrc("player_divid","320","80",flashvars,{},"some_uniq_id");
The "file" flashvar can be used to specify a media file such as mp3 or a playlist xml file.
If it's a single media file, you need to specify "lrc" flashvar to tell the player where lrc file is. (update on 1/18/10)
if it's a playlist, no "lrc" flashvar is needed. You imply that lrc and media are at
same location/directory, and lrc and media have the same filename.
"create_jwplrc" is just a wrapper function that wraps "swfobject.embedSWF". The first argument for create_jwplrc is the id of a "<div>" that will be the player, 2nd/3rd are width and height, 4th is flashvars, 5th is parameters, it can be empty {}. The 6th argument is a unique name for the player.
File download wensheng.com/code/jwlyrics.tgz (updated 1/18/10)
A javascript mp3 player with scrolling lyrics (lrc) display
When listening to music on PC, I use a Chinese mp3 player called TTPlayer. The main feature of TTPlayer is it display lyrics that synced with the music.
Searching for a web equivalent, the closest thing i found is this. But it has issues, for me anyway, i.e. play only one song, no play/pause control, can't scroll back, can't replay, use an unfamiliar animation framework. So I look at the code and come up with my own. The player is based on soundmanager2 demo code. It use jquery and jquery scrollto plugin.
The demo is at: http://wensheng.com/code/sm_lyrics/
The code can be downloaded here.
Searching for a web equivalent, the closest thing i found is this. But it has issues, for me anyway, i.e. play only one song, no play/pause control, can't scroll back, can't replay, use an unfamiliar animation framework. So I look at the code and come up with my own. The player is based on soundmanager2 demo code. It use jquery and jquery scrollto plugin.
The demo is at: http://wensheng.com/code/sm_lyrics/
The code can be downloaded here.
7/31/09
Happy Girls
I will be watching Tonight's Super Girls (or Happy Girls, as it's called now). I don't know why I watch it. I never watched American Idols or any other pop contest shows. And I absolutely hate the most populor one of previous super-girls winner - Li Yuchun.
But since I watched this year's happy-girls one night with wife, I got hooked. Maybe it's just the pretty girls I'd like to watch. I told a co-worker the other day I like Happy-girls, she said I'd have become dirty middle-aged man (龌龊中年男人). Is that the reason? Ouch..
I am rooting for Liu Xijun 刘惜君. (big pic)
I also like Tan Lina 谈莉娜, she's very pretty. (pic)
I like Li Xiaoyun 李宵云 too （video), but she's not good-looking. Huang ying's good too, but her voice style gets old after a while. I really don't care for other girls.
Here's a video of Liu from youtube singing "伤痕". In my opinion, it's better than Lin yilian's original.
But since I watched this year's happy-girls one night with wife, I got hooked. Maybe it's just the pretty girls I'd like to watch. I told a co-worker the other day I like Happy-girls, she said I'd have become dirty middle-aged man (龌龊中年男人). Is that the reason? Ouch..
I am rooting for Liu Xijun 刘惜君. (big pic)
I also like Tan Lina 谈莉娜, she's very pretty. (pic)
I like Li Xiaoyun 李宵云 too （video), but she's not good-looking. Huang ying's good too, but her voice style gets old after a while. I really don't care for other girls.
Here's a video of Liu from youtube singing "伤痕". In my opinion, it's better than Lin yilian's original.
7/30/09
set up geo dns (geodns) on Fedora using geoipdns pt 2
Here I describe the steps of set up Geoipdns (a Tinydns fork at does geo dns). First following these steps here to set up Tinydns. Even though Geoipdns is a fork, it doesn't provide the configuration programs such as tinydns-conf that's in Tinydns. So it's much easier to set up Geoipdns after we already have Tinydns set up.
You can read Geoipdns document on http://pub.mud.ro/wiki/Geoipdns.
Here are quick steps:
$yum install inotify-tools-devel
#geoipdns use libinotifytools.
$mkdir vdns
$cd vdns/
$wget http://pub.mud.ro/~cia/files/vdns-src.tgz
$tar xfz vdns-src.tgz
$vi conf-cc
#Add " -include /usr/include/errno.h" to the first line of conf-cc
$LOCAL_CFLAGS="-DUSE_LOCMAPS -DUSE_SFHASH -DUSE_TOUCH_RELOADS -DDEBUG_MODE -DHAVE_MMAP_READAHEAD"
$make
$mkdir /usr/local/apps
$./install
$cp -rp /usr/local/apps/vdns/bin/* /usr/local/bin/
The last step is to allow us access vdnsd vdnsdb without add to PATH.
Now geoipdns is installed. Next we need to configure it so it does geo dns.
$cd /etc/tinydns
$cp run run.tinydns #backup run
$vi run
#inside run, we change /usr/local/bin/tinydns to/usr/local/bin/vdnsd
$cd root
$vi Makefile
#inside Makefile we change tinydns-data to vdnsdb
$make
$svc -t /service/tinydns
Now vdnsd should be running, use "ps -ef" to see that vdnsd is running tinydns is not, but you still should see "supervise tinydns".
Do some dig to make sure everything still works just like Tinydns is running.
Now you need to query the server from at least 2 different locations, otherwise you don't know if geodns works or not.
If you set up dns on local network, such as 192.168.1.0, you can put IP's of local machines in "data" and test geodns from these local machine.
If you have a world facing DNS server and you want to test geodns, you can put the IP's of your home, work, colocated server, or VPS in data, then test dns from those locations.
However if you want to test it fast at where you are, you are also in luck, because there're several online dig sites you can use. I will use 2 such sites as examples:
http://dig.menandmice.com/knowledgehub/tools/dig ip is 207.57.2.84
http://www.subnetonline.com/pages/network-tools/online-dig.php ip is 85.17.250.238
Note these Ip's are as of this writing. If they have changed at the time of your testing, you need to change them too in your data file.
Now the data. Suppose your DNS server name is ns1.myserver.com (replace it with your real dns server name), add these to your /etc/tinydns/root/data file:
Now you can start testing. First do a "dig @ns1.myserver.com www.example.com" locally. It should say 3.3.3.3. Then go to http://dig.menandmice.com/knowledgehub/tools/dig , enter name server "ns1.myserver.com", enter domain name "www.example.com", click "perform query", it should say 1.1.1.1. Now do the same on http://www.subnetonline.com/pages/network-tools/online-dig.php, it should say 2.2.2.2.
If they display correct fake information, your geo dns works.
Next you need to add real IP location data and setup geo dns for your real domains.
I will talk about this in another post.
You can read Geoipdns document on http://pub.mud.ro/wiki/Geoipdns.
Here are quick steps:
$yum install inotify-tools-devel
#geoipdns use libinotifytools.
$mkdir vdns
$cd vdns/
$wget http://pub.mud.ro/~cia/files/vdns-src.tgz
$tar xfz vdns-src.tgz
$vi conf-cc
#Add " -include /usr/include/errno.h" to the first line of conf-cc
$LOCAL_CFLAGS="-DUSE_LOCMAPS -DUSE_SFHASH -DUSE_TOUCH_RELOADS -DDEBUG_MODE -DHAVE_MMAP_READAHEAD"
$make
$mkdir /usr/local/apps
$./install
$cp -rp /usr/local/apps/vdns/bin/* /usr/local/bin/
The last step is to allow us access vdnsd vdnsdb without add to PATH.
Now geoipdns is installed. Next we need to configure it so it does geo dns.
$cd /etc/tinydns
$cp run run.tinydns #backup run
$vi run
#inside run, we change /usr/local/bin/tinydns to/usr/local/bin/vdnsd
$cd root
$vi Makefile
#inside Makefile we change tinydns-data to vdnsdb
$make
$svc -t /service/tinydns
Now vdnsd should be running, use "ps -ef" to see that vdnsd is running tinydns is not, but you still should see "supervise tinydns".
Do some dig to make sure everything still works just like Tinydns is running.
Now you need to query the server from at least 2 different locations, otherwise you don't know if geodns works or not.
If you set up dns on local network, such as 192.168.1.0, you can put IP's of local machines in "data" and test geodns from these local machine.
If you have a world facing DNS server and you want to test geodns, you can put the IP's of your home, work, colocated server, or VPS in data, then test dns from those locations.
However if you want to test it fast at where you are, you are also in luck, because there're several online dig sites you can use. I will use 2 such sites as examples:
http://dig.menandmice.com/knowledgehub/tools/dig ip is 207.57.2.84
http://www.subnetonline.com/pages/network-tools/online-dig.php ip is 85.17.250.238
Note these Ip's are as of this writing. If they have changed at the time of your testing, you need to change them too in your data file.
Now the data. Suppose your DNS server name is ns1.myserver.com (replace it with your real dns server name), add these to your /etc/tinydns/root/data file:
%onlinedig1:207.57.2.84:32Do a "make" to update the data hash.
%onlinedig2:85.17.250.238:32
.example.com::ns1.myserver.com:259200
+www.example.com:1.1.1.1:3600::onlinedig1
+www.example.com:2.2.2.2:3600::onlinedig2
+www.example.com:3.3.3.3:3600::nomatch
Now you can start testing. First do a "dig @ns1.myserver.com www.example.com" locally. It should say 3.3.3.3. Then go to http://dig.menandmice.com/knowledgehub/tools/dig , enter name server "ns1.myserver.com", enter domain name "www.example.com", click "perform query", it should say 1.1.1.1. Now do the same on http://www.subnetonline.com/pages/network-tools/online-dig.php, it should say 2.2.2.2.
If they display correct fake information, your geo dns works.
Next you need to add real IP location data and setup geo dns for your real domains.
I will talk about this in another post.
7/29/09
Why geo dns - setting up geodns on fedora part 1
First of all, what is geodns? Let's look at an example. The following show the outputs of dig and ping on www.google.com from 3 different geographical locations.
First from Dallas:
The 3 popular DNS software (bind, powerdns, tinydns) all have geo capability, either with patch, backend, or in tinydns case, a fork called geoipdns. I have been using Tinydns for several years and very satisfied with its ease of use and performance. So I stick with Tinydns for my geodns.
The geodns fork of Tinydns is called geoipdns, it's written by Adrian Ilarion Ciobanu.
I will talk about how to set up Geoipdns in the next post.
First from Dallas:
270 06:13 PM wang@ns1)dig www.google.com +shortNext from Xi'an, China:
www.l.google.com.
74.125.47.99
74.125.47.103
(truncated)
271 06:13 PM wang@ns1)ping -c 2 www.google.com
PING www.l.google.com (74.125.47.99) 56(84) bytes of data.
64 bytes from yw-in-f99.google.com (74.125.47.99): icmp_seq=1 ttl=54 time=21.2 ms
64 bytes from yw-in-f99.google.com (74.125.47.99): icmp_seq=2 ttl=54 time=21.0 ms
[wang@www ~]$ dig www.google.com +shortFinally from Zhejiang China:
www.l.google.com.
64.233.189.104
64.233.189.147
64.233.189.99
[wang@www ~]$ ping -c 2 www.google.com
PING www.l.google.com (64.233.189.147) 56(84) bytes of data.
64 bytes from hk-in-f147.google.com (64.233.189.147): icmp_seq=1 ttl=242 time=45.7 ms
64 bytes from hk-in-f147.google.com (64.233.189.147): icmp_seq=2 ttl=242 time=45.8 ms
137 03:06 PM wang@cn)dig www.google.com +shortYou can see the IP's for www.google.com from these locations are different. The reason for this is that Google want to send www.google.com visitors to their nearest web servers. Why? you might ask. Because of network latency. Here's output from pinging US google server from China:
www.l.google.com.
66.249.89.99
66.249.89.104
66.249.89.147
138 03:06 PM wang@cn)ping -c 2 www.google.com
PING www.l.google.com (66.249.89.99) 56(84) bytes of data.
64 bytes from jp-in-f99.google.com (66.249.89.99): icmp_seq=1 ttl=243 time=47.4 ms
64 bytes from jp-in-f99.google.com (66.249.89.99): icmp_seq=2 ttl=243 time=47.4 ms
[wang@www ~]$ ping 74.125.47.99 -c 2So the ping time is >10 times as long as ping time from within US. If Google doesn't have servers in China (or hk, jp, or whatever closer to China), the experience of Chinese www.google.com visitors will be really bad (long response time, slow page load).
PING 74.125.47.99 (74.125.47.99) 56(84) bytes of data.
64 bytes from 74.125.47.99: icmp_seq=1 ttl=44 time=258 ms
64 bytes from 74.125.47.99: icmp_seq=2 ttl=44 time=261 ms
The 3 popular DNS software (bind, powerdns, tinydns) all have geo capability, either with patch, backend, or in tinydns case, a fork called geoipdns. I have been using Tinydns for several years and very satisfied with its ease of use and performance. So I stick with Tinydns for my geodns.
The geodns fork of Tinydns is called geoipdns, it's written by Adrian Ilarion Ciobanu.
I will talk about how to set up Geoipdns in the next post.
Set up Tinydns on Fedora
Installing Tinydns (djbdns) on Fedora consists of 4 steps:
1, Install daemontools
2, Install ucspi-tcp
3, Install djbdns
4, configure tinydns
Step 1: Daemontools
First of all, make sure we have all the packages that's needed:
Then
The content of this file /etc/event.d/svscan is:
Step 2: ucspi-tcp
This is simple:
Step 3: djbdns
This is quick too:
Step 4: configuration
I will only tinydns here, setting up dnscache is very similiar to setting up tinydns.
That's it, do "svstat /service/tinydns" again, it should show the seconds it's up keep increasing. If not, like for example it stuck at 0 or 1 second, then your setup is not correct.
To debug the problem, do some of these:
Look at /etc/tinydns/log/main/current to see if there's error.
Make sure there's a supervise directory in /etc/tinydns/
Make sure there's No directory under /etc/tinydns/env
remove /service/tinydns link and re-link
remove /etc/tinydns directory and re-create them using tinydns-conf
stop and start the service using "svc" ("svc -d" then "svc_u" or "svc -t" etc.)
Next, just add records to "/etc/tinydns/root/data", and then "make", tinydns should now happily serve any requests from anywhere. If not, use "dig" to debug the problem.
1, Install daemontools
2, Install ucspi-tcp
3, Install djbdns
4, configure tinydns
Step 1: Daemontools
First of all, make sure we have all the packages that's needed:
yum install gcc gcc-c++ make flex bison # etc.This will install all the compilers, kernel-headers, tools and stuff.
Then
mkdir daemontools
cd daemontools
wget http://cr.yp.to/daemontools/daemontools-0.76.tar.gz
tar xvfz daemontools-0.76.tar.gz
cd admin/daemontools-0.76/
vi compile/conf-cc #add " -include /usr/include/errno.h" at the end of 1st line
./package/install
cd /command
\rm * #get rid of links, we will use actual excutables here
cp -rp /root/daemontools/admin/daemontools/command/* .
vi /etc/inittab #get rid of that svscanboot line because it's not used from fc9
vi /etc/event.d/svscan #create this new file
The content of this file /etc/event.d/svscan is:
start on runlevel [2345]Now daemontools setup is complete. Do a "ps -ef" to see if svscan is running. If not, manually start it, or reboot.
stop on runlevel [016]
respawn
exec /command/svscanboot
Step 2: ucspi-tcp
This is simple:
mkdir ucspi-tcp
cd ucspi-tcp/
wget http://cr.yp.to/ucspi-tcp/ucspi-tcp-0.88.tar.gz
tar xvfz ucspi-tcp-0.88.tar.gz
cd ucspi-tcp-0.88
vi conf-cc # put " -include /usr/include/errno.h" at the end of 1st line
make
./install
Step 3: djbdns
This is quick too:
mkdir djbdns
cd djbdns/
wget http://cr.yp.to/djbdns/djbdns-1.05.tar.gz
tar xvfz djbdns-1.05.tar.gz
cd djbdns-1.05
vi conf-cc # add " -include /usr/include/errno.h" to the 1st line
make
./install
Step 4: configuration
I will only tinydns here, setting up dnscache is very similiar to setting up tinydns.
useradd –s /bin/false tinydns
useradd –s /bin/false dnslog
tinydns-conf tinydns dnslog /etc/tinydns your_external_ip
ln -s /etc/tinydns /service/
svstat /service/tinydns
That's it, do "svstat /service/tinydns" again, it should show the seconds it's up keep increasing. If not, like for example it stuck at 0 or 1 second, then your setup is not correct.
To debug the problem, do some of these:
Look at /etc/tinydns/log/main/current to see if there's error.
Make sure there's a supervise directory in /etc/tinydns/
Make sure there's No directory under /etc/tinydns/env
remove /service/tinydns link and re-link
remove /etc/tinydns directory and re-create them using tinydns-conf
stop and start the service using "svc" ("svc -d" then "svc_u" or "svc -t" etc.)
Next, just add records to "/etc/tinydns/root/data", and then "make", tinydns should now happily serve any requests from anywhere. If not, use "dig" to debug the problem.
6/12/09
Creating a Fedora 11 image
Fedora 11 is out. I made a fedora 11 image as my domU. The steps for making a Fedora 11 image is little different than those for Fedora 10 that I have described here. But there are some caveats, all related to RPM.
First you have must rpm version > 4.6, otherwise you have have this MD5 errors (fedora 11 doesn't use md5 checksum anymore).
Second, the new rpm in fedora 11 use LUA, but liblua.so is not installed by yum groupinstall. So inside fedora 11, we have this chicken and egg problem. To install liblua.so from liblua.rpm (and anything else from rpm) we need rpm; but to run rpm, we need liblua.so. To solve this, just copy liblua.so from fedora 10 to fedora 11's /usr/lib when fedora 11's image is mounted in fedora 10.
Other than these, everything's fine with making Fedora 11 image.
First you have must rpm version > 4.6, otherwise you have have this MD5 errors (fedora 11 doesn't use md5 checksum anymore).
Second, the new rpm in fedora 11 use LUA, but liblua.so is not installed by yum groupinstall. So inside fedora 11, we have this chicken and egg problem. To install liblua.so from liblua.rpm (and anything else from rpm) we need rpm; but to run rpm, we need liblua.so. To solve this, just copy liblua.so from fedora 10 to fedora 11's /usr/lib when fedora 11's image is mounted in fedora 10.
Other than these, everything's fine with making Fedora 11 image.
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