I’m going to remake them in two tutorials instead of one. In the meantime here’s the content of my bash profile with the elements I use to smooth my daily experience of git:

#### start Git #####
alias g='git'
alias gco='git checkout'
alias gma='git checkout master'
alias gst='git status'
alias glo='git log'
alias gca='git commit -a'
alias gsd='git svn dcommit'
alias gcav='git commit -v -a'
alias squash='git merge --squash'
alias gpatch='git format-patch'
alias saw='git branch -D'
alias rollback='git reset --hard git-svn'
alias uncommit='git reset --mixed HEAD'
alias fixlastcommit='git commit --amend'
alias branches='git branch -a'
alias grow='git checkout -b'
alias plant='git svn init'
alias gclone='git clone'
alias hide='git stash'
alias unhide='git stash apply'

export PS1='\w $(git branch &>/dev/null; if [ $? -eq 0 ]; then \
echo "(\[\033[00m\]$(git branch | grep ^*|sed s/\*\ //)) "; fi)\$\[\033[00m\] '

#### end Git #####

In addition, he noticed that on some Xen VMs, you may encounter the following error:


ERROR: Need to be root to increase max connections


in which case, you will need to update /etc/security/limits.conf with the values:


mogile soft nofile 65535
mogile hard nofile 65535


I came an across an elegant solution  to this problem as decribed on this blog.

I used 4 Xen virtual images running ubuntu 8.04.
Two will run a tracker and the database, the other two will be the storage nodes.

Lets say the IP addresses will be:


192.168.0.195
192.168.0.196
192.168.0.197
192.168.0.198


2. Initial Setup

Install iptables:


apt-get install iptables


then apply initial setup


iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp --dport ssh -j ACCEPT
iptables -A INPUT -j DROP
iptables-save -c > /etc/iptables.rules

you can save the rule for beyond machine reboot by adding the two lines below to /etc/network/interfaces

pre-up iptables-restore < /etc/iptables.rules
post-down iptables-save -c > /etc/iptables.rules


install mysql and wget and perldoc


apt-get install mysql-server
apt-get install wget
apt-get install perl-doc
apt-get install libio-aio-perl
apt-get install subversion
apt-get install build-essential


3. Common steps for installing MogileFS

retrieve the code (ripped of the how to wiki):


cd /usr/local/src
mkdir mogilefs-src
cd mogilefs-src
svn checkout http://code.sixapart.com/svn/mogilefs/trunk


install perl dependencies


cpan Danga::Socket
cpan Gearman::Client
cpan Gearman::Server
cpan Gearman::Client::Async
cpan Net::Netmask
cpan Perlbal
cpan IO::WrapTie


install the servers:


cd mogilefs-src/trunk/server
perl Makefile.PL
make
make test
make install


At the moment the test seems to need mysql to be installed and user root without password, so some tests are skipped

you will need to install MogileFS::Client
(the tests expect a tracker to run locally on port 7001)


cd mogilefs-src/trunk/api/perl/MogileFS-Client
perl Makefile.PL
make
make test
make install


and some admin tools:


cd mogilefs-src/trunk/utils
perl Makefile.PL
make
make test
make install


4. Tracker install

create the database:


mysql -uroot -p
mysql> CREATE DATABASE mogilefs;
mysql> GRANT ALL ON mogilefs.* TO 'mogile'@'%';
mysql> SET PASSWORD FOR 'mogile'@'%' = OLD_PASSWORD( 'sekrit' );
mysql> FLUSH PRIVILEGES;
mysql> quit


Create the schema


./mogdbsetup --dbname=mogilefs --dbuser=mogile --dbpassword=sekrit


(admin privilege is required for the initial setup, so if you’re admin user is not root with no password, you will need to specify –dbroopassword and –dbrootuser)

create /etc/mogilefs/mogilefsd.conf:


db_dsn DBI:mysql:mogilefs
db_user mogile
db_pass ******
conf_port 7001
listener_jobs 5


create a mogile user:


adduser mogile


and starts the tracker under that user:


su - mogile
mogilefsd


open a port for the tracker


iptables -A INPUT -p tcp --dport 7001 -j ACCEPT

5. Storage node

On the storage server, create a configuration file at /etc/mogilefs/mogstored.conf with the following:


httplisten=0.0.0.0:7500
mgmtlisten=0.0.0.0:7501
docroot=/var/mogdata


open a port:


iptables -A INPUT -p tcp --dport 7500 -j ACCEPT

iptables -A INPUT -p tcp --dport 7501 -j ACCEPT

register a new storage node:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 host add mogilestorage --ip=192.168.0.197 --port=7500 --status=alive


it should now appears in the list:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 host list


Add a device to the storage:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 device add mogilestorage 1


and create the directory:


mkdir -p /var/mogdata/dev1

make sure /var/mogdata/* is owned by mogile:mogile


chown -R mogile:mogile /var/mogdata/*


6. Starting the storage server

as root:

mogstored --daemon


7. Starting the tracker


su - mogile
mogilefsd -c /etc/mogilefs/mogilefsd.conf --daemon
exit


8. Testing

check that mogilefs components are online:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 check


Quick sanity check of the storage daemon:


~/Projects/mogilefs $ telnet 192.168.0.197 7500
Trying 192.168.0.197...
Connected to 192.168.0.197.
Escape character is '^]'.
PUT /dev1/test HTTP/1.0
Content-length: 4
\n
test
HTTP/1.0 200 OK
Content-Type: text/html
Content-Length: 18
Server: Perlbal
Connection: close
200 - OK
Connection closed by foreign host.


create a domain


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 domain add mydomain


and a class


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 class add mydomain images


Quick sanity check of the tracker:


root@bbc-01:~# mogtool --trackers=127.0.0.1:7001 --domain=mydomain --class=images inject osname osname


on the store node, check /var/mogdata/dev1/0/000/000 for a file named xxxxxxxxxx.fid .
If the file exists it’s all good.

9. setting up the second pair

Replay instructions 1 to 8, then:

when you’ve got the second storage set up, you will need to register the second storage and its device to all trackers:


mkdir -p /var/mogdata/dev2
mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 host add mogilestorage2 --ip=192.168.0.198 --port=7500 --status=alive
mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001 device add mogilestorage2 2
mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.196:7001 host add mogilestorage2 --ip=192.168.0.198 --port=7500 --status=alive
mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.196:7001 device add mogilestorage2 2


you will also need to register the first storage and its device to the second tracker:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.196:7001 host add mogilestorage --ip=192.168.0.197 --port=7500 --status=alive
mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.196:7001 device add mogilestorage 1


sanity check the installation:


mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=192.168.0.195:7001,192.168.0.196:7001 check

Checking trackers…
192.168.0.195:7001 … OK
192.168.0.196:7001 … OK

Checking hosts…
[ 1] mogilestorage2 … OK
[ 2] mogilestorage … OK

Checking devices…
host device size(G) used(G) free(G) use% ob state I/O%
—- ———— ———- ———- ———- —— ———- —–
[ 1] dev2 9.921 0.757 9.164 7.63% writeable 0.0
[ 2] dev1 9.921 0.600 9.321 6.05% writeable 0.0
—- ———— ———- ———- ———- ——
total: 19.842 1.357 18.485 6.84%

And voila.

with_scope and returning.

Found a blog where they are both nicely explained:

• with_scope
• returning

Flickr has today announced support for video media.
I’m impressed on how the integration is done, it’s the same experience as for photo plus the added value of what they call “long photo”.
Very elegant indeed.

Now coming alongside the release of Safari 3.1, there’s a new Safari plugin that allow the parsing of microformats for integration in various Mac OS X applications (Adress book, iCal).

For Mac OSX users, the integration with Address Book and iCal could make Safari a better microformat reader than Firefox. I cannot test the plugin myself as I don’t have Leopard which is a requirement.

Alternatively the latest version of my feed reader NetNewsWire can also parse microformats but it requires you (obviously by the very definition of microformats) to render the web page in Netnewswire not just the summary.

Safari 3.1 is available for Tiger and Windows though.

Your Company’s App: “Company’s”

(Via Daring Fireball.)

When you look at the full version of the diagramme, you’ll see a rectangle about “people blogging about diagrams”. I am such a nerd!

“

(Via Boing Boing.)

These posters were used mainly as promotional material for London (and therefore the Underground), and it was quite fascinating: the diversity of artistic styles as well as the messages conveyed through them.

These posters can be browsed online on on a dedicated web site.

Among the original artworks, there was a special edition of Harry Beck’s London map:
The topology is about the same as the original, but all the station names are replaced by personalities names and the lines name are replaced by careers(engineers, dignitaries, film actors, italian artists,…)
A cross between two lines represents someone who’s known for being more than one thing, which make the whole process quite a challenge
unfortunately I couldn’t find this map on the online collection but It was quite funny to read and is nice followup to my previous post.

Here are some suggestions for other alternative London maps:
• each station represents an airport and the lines are airline companies
• each station represents a food and the lines are the group of nutriments supplied by the food
• each station represents a london pub and the lines are types of beverage served

Any more ideas?