I was recently faced with the following challenge at work:
A database process could be improved by processing diffs between two sets of data if there was a checksum that could be calculated for the record, which would subsequently be used to check if a record had changed.
The database was on mysql, and there was already a process in the workflow that calculated a unique key based on other fields in each record.
basic calculation of the unique key was as follows:
key = SHA1(concat(field1, field2));
so I wanted something similar, only for all fields that I cared about changing:
checksum = SHA1(concat(field1, field2, ..., field{n}));
however, the problem with concat in mysql is that it returns null if one of the fields in it is null.
Another method that is similar is concat_ws and looks like this
checksum = SHA1(concat_ws(',', field1, field2, ..., fieldN));
that first character in the quotes before the fields is the delimiter for concat_ws, and would normally produce strings like:
"field1value,field2value,...,fieldNvalue"
but this doesn't work if the delimiter is changed in the future (all records would be updated because all checksums would be different). What I needed was a string that didn't have a delimiter in it. Here's what I used:
checksum = SHA1(concat_ws('', field1, ..., fieldN));
by leaving the delimiter blank, I was able to get a string that looked like:
"field1valuefield2value...fieldNvalue"
so why use concat_ws in all this? Because it ignores (drops) nulls by default. Because of this, I didn't have to write any additional code to handle that case.
End result is the checksum was calculated in the same amount of time that the unique key was generated, and the diff processing it allowed provided a nearly 80% reduction in the amount of time to process the data.
The Memory Leak
Friday, September 25, 2015
Friday, June 20, 2014
Eclipse plugins I've found helpful
List of eclipse plugins I've found helpful:
getting eclipse installed on centos:
http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/
Included in Eclipse releases
Juno Releases: http://download.eclipse.org/releases/juno/
Juno Updates: http://download.eclipse.org/eclipse/updates/4.2
Kepler Releases: http://download.eclipse.org/releases/kepler
Kepler Updates: http://download.eclipse.org/eclipse/updates/4.3
Not included in Eclipse releases:
Android Development Toolkit (ADT): https://dl-ssl.google.com/android/eclipse/ aptana studio3: http://download.aptana.com/studio3/plugin/install
checkstyle: http://eclipse-cs.sf.net/update
eCobertura:http://ecobertura.johoop.de/update
FindBugs:http://findbugs.cs.umd.edu/eclipse
PMD: http://pmd.sourceforge.net/eclipse
subclipse: http://subclipse.tigris.org/update_1.8.x (if I need to go back to svn)
Cucumber-JVM: http://cucumber.github.com/cucumber-eclipse/update-site (mostly used for gherkin .feature file syntax highlighting; I use Spinach in a Ruby stack for running the tests)
getting eclipse installed on centos:
http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/
Included in Eclipse releases
Juno Releases: http://download.eclipse.org/releases/juno/
Juno Updates: http://download.eclipse.org/eclipse/updates/4.2
Kepler Releases: http://download.eclipse.org/releases/kepler
Kepler Updates: http://download.eclipse.org/eclipse/updates/4.3
Not included in Eclipse releases:
Android Development Toolkit (ADT): https://dl-ssl.google.com/android/eclipse/ aptana studio3: http://download.aptana.com/studio3/plugin/install
checkstyle: http://eclipse-cs.sf.net/update
eCobertura:http://ecobertura.johoop.de/update
FindBugs:http://findbugs.cs.umd.edu/eclipse
PMD: http://pmd.sourceforge.net/eclipse
subclipse: http://subclipse.tigris.org/update_1.8.x (if I need to go back to svn)
Cucumber-JVM: http://cucumber.github.com/cucumber-eclipse/update-site (mostly used for gherkin .feature file syntax highlighting; I use Spinach in a Ruby stack for running the tests)
Friday, May 2, 2014
Speeding up file open/close in Eclipse 4.3(Kepler) on CentOS 6.5
I recently started a new job, and have been using CentOS 6.5 for my laptop while working as a QA Automation engineer. One of the issues I have run into is that eclipse (main IDE that I use) was taking a long time to both open and close files.
Come to find out that a bug that was initially reported in 2008 is still wreaking havok, namely that gtk+ hangs when looking for network printers using CUPS. This is significant because it doesn't just affect eclipse, but has also been reported to affect firefox, openoffice/LibreOffice, and other applications where you would want to print.
If you want to confirm that this affects you, start eclipse with the following arguements:
eclipse -vmargs -Dorg.eclipse.swt.internal.gtk.disablePrinting
then, open and close files in eclipse and observe performance. For me, files were taking approx 10-30 seconds to open, and up to 30 seconds to close, for *every file*. Running with this option dropped the open/close time to <= 5 sec per file.
Since this impacts more than just eclipse, I wanted to make sure this was resolved on my system. The best workaround I have found is the following, mentioned at the debian bug report listed below. Steps are as follows:
after this, I was able to open eclipse as normal, without the -vmargs argument and without the delay in opening/closing files. Less time waiting on the computer, more time being productive. :-)
see the links below if you are interested in the nitty gritty.
debian bug report that lists work around:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594997
eclipse bug report of the issue with the eclipse vmargs workaround
https://bugs.eclipse.org/bugs/show_bug.cgi?id=275072
linked eclipse bug with more info:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=215234
eclipse faq entry with short discussion of issue:
http://www.eclipse.org/swt/faq.php#printOnGTKHangs
Come to find out that a bug that was initially reported in 2008 is still wreaking havok, namely that gtk+ hangs when looking for network printers using CUPS. This is significant because it doesn't just affect eclipse, but has also been reported to affect firefox, openoffice/LibreOffice, and other applications where you would want to print.
If you want to confirm that this affects you, start eclipse with the following arguements:
eclipse -vmargs -Dorg.eclipse.swt.internal.gtk.disablePrinting
then, open and close files in eclipse and observe performance. For me, files were taking approx 10-30 seconds to open, and up to 30 seconds to close, for *every file*. Running with this option dropped the open/close time to <= 5 sec per file.
Since this impacts more than just eclipse, I wanted to make sure this was resolved on my system. The best workaround I have found is the following, mentioned at the debian bug report listed below. Steps are as follows:
- sudo vi /etc/cups/cupsd.conf
- comment out "Listen /var/run/cups/cups.sock"
- sudo vi /etc/cups/client.conf
- add "ServerName 127.0.0.1"
- sudo service cups restart
after this, I was able to open eclipse as normal, without the -vmargs argument and without the delay in opening/closing files. Less time waiting on the computer, more time being productive. :-)
see the links below if you are interested in the nitty gritty.
debian bug report that lists work around:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594997
eclipse bug report of the issue with the eclipse vmargs workaround
https://bugs.eclipse.org/bugs/show_bug.cgi?id=275072
linked eclipse bug with more info:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=215234
eclipse faq entry with short discussion of issue:
http://www.eclipse.org/swt/faq.php#printOnGTKHangs
Sunday, March 3, 2013
Linux printing to a Windows Shared Printer - update
This is an update to my previous post about getting my printer working.
Basic set-up was a network print server that was already set up and working with Windows (XP and 7). Goal was to add the printer to a Linux system without affecting any existing set-up. I tried CUPS, but ultimately used LPD/LPR to get it working.
My previous post was for RHEL/CEntOS 5. This update relates to RHEL/CEntOS 6, and can be done from the Gnome Desktop. These instructions assume that you already know the host IP you're using as your print server
In the following instructions, enter the root password if you are prompted for authentication:
You should be set at this point!
Basic set-up was a network print server that was already set up and working with Windows (XP and 7). Goal was to add the printer to a Linux system without affecting any existing set-up. I tried CUPS, but ultimately used LPD/LPR to get it working.
My previous post was for RHEL/CEntOS 5. This update relates to RHEL/CEntOS 6, and can be done from the Gnome Desktop. These instructions assume that you already know the host IP you're using as your print server
In the following instructions, enter the root password if you are prompted for authentication:
- Click System > Administration > Printing
- Click the "New" button
- Enter password if prompted
- Click the "Do it later" button to change your firewall settings (you shouldn't need to change them)
- Enter Root password if prompted
- Expand "Network Printer" in the left tree
- Select "LPD/LPR Host or Printer" in the left tree
- In the right side, enter your information
- (in my case, Host: 192.168.x.x, Queue: Samsung_2010)
- Click "Forward"
- Select your printer make from the database and click "Forward"
- Select your printer model from the left tree, and the driver from the right tree
- Click "Forward"
- Enter a unique name for the computer (line #1), a human-readable name (line #2) and a location (line #3)
- Click "Apply"
- When prompted, click "Yes" to print a test page
You should be set at this point!
Saturday, February 9, 2013
SQLite Database Browser on CentOS6
Working through Michael Hartl's Ruby on Rails Tutorial, chapter 6 calls for the SQLite Database Browser.
Just wanted to put a note out there for anyone building this on CentOS6: make sure you check the version of qt that your qmake command runs against.
The below commands show how to check which version you're using, and run the correct one to build Sqlite Database Browser.
check installed qt versions
[user@dev-workstation sqlitebrowser]$ which qmake
/usr/lib64/qt-3.3/bin/qmake
[user@dev-workstation sqlitebrowser]$ ls /usr/lib64/qt*
/usr/lib64/qt-3.3:
bin include lib mkspecs phrasebooks plugins translations
/usr/lib64/qt4:
bin mkspecs phrasebooks plugins q3porting.xml
confirm qt4/bin/qmake is there
[user@dev-workstation sqlitebrowser]$ ls /usr/lib64/qt4/bin/qmake
/usr/lib64/qt4/bin/qmake
commands to run to build Sqlite Database Browser
[user@dev-workstation sqlitebrowser]$ /usr/lib64/qt4/bin/qmake
[user@dev-workstation sqlitebrowser]$ make
after building, move to your ~/bin folder and enjoy
[user@dev-workstation sqlitebrowser]$ cp sqlitebrowser ~/bin/
[user@dev-workstation sqlitebrowser]$ which sqlitebrowser
~/bin/sqlitebrowser
[user@dev-workstation sqlitebrowser]$ sqlitebrowser &
[user@dev-workstation sqlitebrowser]$
hope this helps. :)
Just wanted to put a note out there for anyone building this on CentOS6: make sure you check the version of qt that your qmake command runs against.
The below commands show how to check which version you're using, and run the correct one to build Sqlite Database Browser.
check installed qt versions
[user@dev-workstation sqlitebrowser]$ which qmake
/usr/lib64/qt-3.3/bin/qmake
[user@dev-workstation sqlitebrowser]$ ls /usr/lib64/qt*
/usr/lib64/qt-3.3:
bin include lib mkspecs phrasebooks plugins translations
/usr/lib64/qt4:
bin mkspecs phrasebooks plugins q3porting.xml
confirm qt4/bin/qmake is there
[user@dev-workstation sqlitebrowser]$ ls /usr/lib64/qt4/bin/qmake
/usr/lib64/qt4/bin/qmake
commands to run to build Sqlite Database Browser
[user@dev-workstation sqlitebrowser]$ /usr/lib64/qt4/bin/qmake
[user@dev-workstation sqlitebrowser]$ make
after building, move to your ~/bin folder and enjoy
[user@dev-workstation sqlitebrowser]$ cp sqlitebrowser ~/bin/
[user@dev-workstation sqlitebrowser]$ which sqlitebrowser
~/bin/sqlitebrowser
[user@dev-workstation sqlitebrowser]$ sqlitebrowser &
[user@dev-workstation sqlitebrowser]$
hope this helps. :)
Saturday, February 2, 2013
Setting up Ruby on Rails dev environment
We are working on a ruby app for one of my CS classes, and found that it was easier to set up a virutal linux system than it was to try to get ruby working on windows (mainly because we don't have any stick time on that, and spinning the VM was cheaper).
The principle behind our decision to do this was that it's easier to get help from the community when you stick with the main focus of the community. See an app out there that is primarily linux, but you're a windows admin? It's easier for you to get help by installing and learning linux than it is to try to make it work under windows, even if this is a possibility. I've had to learn this the hard way at work, and it was much easier to move forward with the software when I finally bit the bullet and went all in on linux.
The argument against this goes something like: "we have experience in the company with 'blah' and this can be made to run on 'blah', so we'd like to leverage our existing expertise..." etc. Unless you're looking to become the pioneers in making it work, you're better off just sticking with the primary environment the software was built in.
The place this really matters is smaller companies. Most of you out there probably use windows for your day-to-day work, because it's familiar, but the software you'd like to use runs on linux, which you don't really know. If you're trying to avoid the cost of having it hosted (read "managed") by another company, learn linux.
I'm interested to know what others think of this, if they have experiences that are similar to mine, or if you think I'm nuts. (OK, you're right on that last part :-D ).
Here's what we did to get our ruby environment set up. If anyone has feedback on these instructions, I'm all ears. Have fun.
(it should be noted that the instructions below were used in conjunction with http://ruby.railstutorial.org/book. The part on bitbucket and heroku were based on having already published an app per that tutorial).
installing CentOS 6.3 on virtual box
===========
install virtual box
for windows: http://download.virtualbox.org/virtualbox/4.2.6/VirtualBox-4.2.6-82870-Win.exe
for mac: http://download.virtualbox.org/virtualbox/4.2.6/VirtualBox-4.2.6-82870-OSX.dmg
setup VM virtual box config
Create Virtual Machine
click new
name virtual system (ie: Centos6 x64)
if not already selected, select "Linux" and "Red Hat 64 bit"
click next
set for 1024 MB RAM
create a virtual hard drive now, click create
VDI, click next
Dynamically allocated, click next
set for 16GB, click create
click settings
Configure Network Connections
select "Network" in left tree
set as follows:
Adatper 1:
Enabled
Attached to: Bridged Adapter
Name: (your wired ethernet connection)
Adapter 2:
Enabled
Attached to: Bridged Adapter
Name: (you wireless ethernet connection)
Configure iso for install at boot
click settings
select "Storage" in left tree
select CD drive ("Empty") under Storage Tree on right
click CD icon at right of "IDE Secondary Master" drop down
select "Choose a virtual CD/DVD disk file"
find the CentOS6 DVD iso
click ok to confirm VM settings
config/install CentOS OS
start vm
click in vm screen to capture input
click enter to start install
once CentOS 6 logo loads, you can set one of the following:
right-CTRL+F = full screen
right-CTRL+C = scaled
(I find scaled set to full screen works the best)
proceed with install:
click next (3x)
basic storage device, click next
click "yes, discard any data" (this is for the virtual disk)
click configure network (lower left)
for each adapter:
double-click on name
select "connect automaticaly"
click "Apply"
click "close"
change hostname if desired (ie: centos6-dev)
time zone = America/Denver
uncheck "System clock uses UTC"
click next
set root password, click next
select "use all space", click next
click "write changes to disk"
select "Software Development Workstation"
click next (this starts installing packages)
let install run
reboot
click forward
"yes, I agree", click forward
create your user, click forward
check "Synchronize date and time over the network", click forward (allow ntp to start)
click ok when prompted by kdump
click finish
To open firefox:
click icon
To open Terminal:
Applications > System Tools > Terminal
set up sudo access and harden ssh login
$ su - root (enter root password when prompted)
allow wheel access to root via sudo
# visudo
arrow down to the "wheel" group
press [i]
for the line with %wheel ALL=(ALL) ALL, delete the # sign at the beginning
press [ESC][:][X][ENTER]
give yourself wheel group membership
# usermod -G wheel <username>
confirm
# id <username> wheel(10) should show up in the list of groups
change #PermitRootLogin yes to PermitRootLogin without-password
# vi /etc/ssh/sshd_config
arrow down and over
press [i]
use arrows, backspace and keys to change line
press [ESC][:][X][ENTER]
# service sshd restart
what this will do is allow you to log in and switch users as needed, and prevents someone from logging in as root unless they are using ssh keys
update the system
as root:
# yum -y update
as your user
$ sudo yum -y update
reboot
Install Eclipse Juno:
http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/
Install Eclipse plugins:
eclipse marketplace
aptana studio
dynamic languages toolkit - Ruby Development tools
dynamic languages toolkit - core framework
eclipse EGit
Eclipse JGit
eclipse web developer tools
Import the project:
download the repo from bitbucket
(this can be done from the terminal view in the eclipse web perspective)
$ cd ~/workspace
$ git clone https://$user_name@bitbucket.org/$user_name/$app_name.git
$ cd $app_name
$ git checkout master
Import the project to eclipse with this project:
choose ruby perspective
window > show view > project explorer
method 1 (may not work):
expand local filesystem, browse /path/to/git/advising_app
right-click on advising app, choose "Promote to project"
open App Explorer, and you should see the project
method 2 (known to work:
right click in project explorer, select import
select General > Existing Project into workspace
browse to advising_app folder
click check box by folder on left side
click finish
To open a CLI terminal in Eclipse:
From Web perspective, it will be in the bottom portion of your screen
From Ruby (or any other perspective):
Window menu > Show View > click Other > Studio > Terminal
If you would like a terminal editor (same place as files), click the bigger icon in the view
Some of the next steps might need to be run from a system terminal rather than an eclipse terminal, I can't remember which
Install Ruby on Rails environment
Install RVM:
$ \curl -L https://get.rvm.io | bash -s stable
Install Ruby, RubyGems, Rails, etc.
see section 1.2.2 of http://ruby.railstutorial.org/book
Install Heroku toolbelt:
$ wget -qO- https://toolbelt.heroku.com/install.sh | sh
$ cd ~/workspace/advising_app
$ heroku login
enter your heroku account credentials when prompted
The principle behind our decision to do this was that it's easier to get help from the community when you stick with the main focus of the community. See an app out there that is primarily linux, but you're a windows admin? It's easier for you to get help by installing and learning linux than it is to try to make it work under windows, even if this is a possibility. I've had to learn this the hard way at work, and it was much easier to move forward with the software when I finally bit the bullet and went all in on linux.
The argument against this goes something like: "we have experience in the company with 'blah' and this can be made to run on 'blah', so we'd like to leverage our existing expertise..." etc. Unless you're looking to become the pioneers in making it work, you're better off just sticking with the primary environment the software was built in.
The place this really matters is smaller companies. Most of you out there probably use windows for your day-to-day work, because it's familiar, but the software you'd like to use runs on linux, which you don't really know. If you're trying to avoid the cost of having it hosted (read "managed") by another company, learn linux.
I'm interested to know what others think of this, if they have experiences that are similar to mine, or if you think I'm nuts. (OK, you're right on that last part :-D ).
Here's what we did to get our ruby environment set up. If anyone has feedback on these instructions, I'm all ears. Have fun.
(it should be noted that the instructions below were used in conjunction with http://ruby.railstutorial.org/book. The part on bitbucket and heroku were based on having already published an app per that tutorial).
installing CentOS 6.3 on virtual box
===========
install virtual box
for windows: http://download.virtualbox.org/virtualbox/4.2.6/VirtualBox-4.2.6-82870-Win.exe
for mac: http://download.virtualbox.org/virtualbox/4.2.6/VirtualBox-4.2.6-82870-OSX.dmg
setup VM virtual box config
Create Virtual Machine
click new
name virtual system (ie: Centos6 x64)
if not already selected, select "Linux" and "Red Hat 64 bit"
click next
set for 1024 MB RAM
create a virtual hard drive now, click create
VDI, click next
Dynamically allocated, click next
set for 16GB, click create
click settings
Configure Network Connections
select "Network" in left tree
set as follows:
Adatper 1:
Enabled
Attached to: Bridged Adapter
Name: (your wired ethernet connection)
Adapter 2:
Enabled
Attached to: Bridged Adapter
Name: (you wireless ethernet connection)
Configure iso for install at boot
click settings
select "Storage" in left tree
select CD drive ("Empty") under Storage Tree on right
click CD icon at right of "IDE Secondary Master" drop down
select "Choose a virtual CD/DVD disk file"
find the CentOS6 DVD iso
click ok to confirm VM settings
config/install CentOS OS
start vm
click in vm screen to capture input
click enter to start install
once CentOS 6 logo loads, you can set one of the following:
right-CTRL+F = full screen
right-CTRL+C = scaled
(I find scaled set to full screen works the best)
proceed with install:
click next (3x)
basic storage device, click next
click "yes, discard any data" (this is for the virtual disk)
click configure network (lower left)
for each adapter:
double-click on name
select "connect automaticaly"
click "Apply"
click "close"
change hostname if desired (ie: centos6-dev)
time zone = America/Denver
uncheck "System clock uses UTC"
click next
set root password, click next
select "use all space", click next
click "write changes to disk"
select "Software Development Workstation"
click next (this starts installing packages)
let install run
reboot
click forward
"yes, I agree", click forward
create your user, click forward
check "Synchronize date and time over the network", click forward (allow ntp to start)
click ok when prompted by kdump
click finish
To open firefox:
click icon
To open Terminal:
Applications > System Tools > Terminal
set up sudo access and harden ssh login
$ su - root (enter root password when prompted)
allow wheel access to root via sudo
# visudo
arrow down to the "wheel" group
press [i]
for the line with %wheel ALL=(ALL) ALL, delete the # sign at the beginning
press [ESC][:][X][ENTER]
give yourself wheel group membership
# usermod -G wheel <username>
confirm
# id <username> wheel(10) should show up in the list of groups
change #PermitRootLogin yes to PermitRootLogin without-password
# vi /etc/ssh/sshd_config
arrow down and over
press [i]
use arrows, backspace and keys to change line
press [ESC][:][X][ENTER]
# service sshd restart
what this will do is allow you to log in and switch users as needed, and prevents someone from logging in as root unless they are using ssh keys
update the system
as root:
# yum -y update
as your user
$ sudo yum -y update
reboot
Install Eclipse Juno:
http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/
Install Eclipse plugins:
eclipse marketplace
aptana studio
dynamic languages toolkit - Ruby Development tools
dynamic languages toolkit - core framework
eclipse EGit
Eclipse JGit
eclipse web developer tools
Import the project:
download the repo from bitbucket
(this can be done from the terminal view in the eclipse web perspective)
$ cd ~/workspace
$ git clone https://$user_name@bitbucket.org/$user_name/$app_name.git
$ cd $app_name
$ git checkout master
Import the project to eclipse with this project:
choose ruby perspective
window > show view > project explorer
method 1 (may not work):
expand local filesystem, browse /path/to/git/advising_app
right-click on advising app, choose "Promote to project"
open App Explorer, and you should see the project
method 2 (known to work:
right click in project explorer, select import
select General > Existing Project into workspace
browse to advising_app folder
click check box by folder on left side
click finish
To open a CLI terminal in Eclipse:
From Web perspective, it will be in the bottom portion of your screen
From Ruby (or any other perspective):
Window menu > Show View > click Other > Studio > Terminal
If you would like a terminal editor (same place as files), click the bigger icon in the view
Some of the next steps might need to be run from a system terminal rather than an eclipse terminal, I can't remember which
Install Ruby on Rails environment
Install RVM:
$ \curl -L https://get.rvm.io | bash -s stable
Install Ruby, RubyGems, Rails, etc.
see section 1.2.2 of http://ruby.railstutorial.org/book
Install Heroku toolbelt:
$ wget -qO- https://toolbelt.heroku.com/install.sh | sh
$ cd ~/workspace/advising_app
$ heroku login
enter your heroku account credentials when prompted
Friday, January 25, 2013
BitBucket: git familiar with Atlassian's repo service
I've recently started using a new hosted git provider: Atlassian's BitBucket. While most everyone out there is probably using github, there were two things I noticed about Bitbucket that I liked:
While I am a huge supporter of open source software, until now, I wasn't aware of any public cloud options for having a private repo without setting up a billed account (other than installing and managing your own server). Simply put, I'd rather not add yet another copy of whatever tutorial I'm working through to the web. (I will however, write about it :) ) Not everything should be public.
I'm also interesting in hearing what you have to say about this. Will you be migrating everything as soon as you can? Will you be sticking with GitHub? Some mix of the two? What arguments could or should be considered for paying for this kind of service? I do have to say that I'm glad there is another option, since competition leads to better products and services for those using them.
- They have made https work for checking in with git version 1.7.1 (default yum install git from CentOS 6.x)
- They allow the option to have private repositories
While I am a huge supporter of open source software, until now, I wasn't aware of any public cloud options for having a private repo without setting up a billed account (other than installing and managing your own server). Simply put, I'd rather not add yet another copy of whatever tutorial I'm working through to the web. (I will however, write about it :) ) Not everything should be public.
I'm also interesting in hearing what you have to say about this. Will you be migrating everything as soon as you can? Will you be sticking with GitHub? Some mix of the two? What arguments could or should be considered for paying for this kind of service? I do have to say that I'm glad there is another option, since competition leads to better products and services for those using them.
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