7. Not Invented Here
?
http://www.flickr.com/photos/evdg/150116781/ http://www.flickr.com/photos/junewess/2111679056/
8. Not Invented Here
Who is your daddy, and what does he do?
Puppet Capistrano
• Ruby / Ruby-ish • Ruby / Ruby-ish
• Written by a Systems Administrator • Written by a Rails Developer
• Luke Kanies – Reductive Labs • Jamis Buck – 37signals
• Designed to manage server configuration • Designed to deploy web applications
http://www.madstop.com/ http://weblog.jamisbuck.org/
http://en.wikipedia.org/wiki/Puppet http://en.wikipedia.org/wiki/Capistrano
http://reductivelabs.com/projects/puppet/ http://www.capify.org/
9. Why use Capistrano when we have Puppet?
Heard during a Capistrano talk at OSCON
• Restart a particular service on multiple servers once
• Check the state of a service or resource (memory, cpu) that isn’t monitored
• Run a command on multiple servers AND monitor it’s output
• Systems deployment tasks: install puppet, build VMs, etc.
11. Not Invented Here
?
http://www.flickr.com/photos/evdg/150116781/ http://www.flickr.com/photos/junewess/2111679056/
12. Not Invented Here
Not all package management systems are created equal.
Debian doesn’t need another package management system.
We have our own, it works quite well, thank you.
http://pkg-ruby-extras.alioth.debian.org/rubygems.html
PLEASE do not install unpackaged software on production
systems that someone else might have to inherit after your
very timely demise.
Also note that ‘gem update –system’ tends to break
Debian/Ubuntu ruby installations, and is disabled in
libgems-ruby 1.0.0-1
13. Building a Capistrano deb
1. apt-get install build-essential fakeroot ruby-pkg-tools
2. svn checkout svn://svn.debian.org/pkg-ruby-extras/packages-wip/capistrano/trunk/
3. wget http://rubyforge.org/frs/download.php/33072/capistrano-2.2.0.tgz
4. tar -xvzf capistrano-2.2.0.tgz
5. mv trunk/* capistrano-2.2.0/
6. cd capistrano-2.2.0/
7. dch –v2.2.0
8. dpkg-buildpackage –rfakeroot
1. cd ..
2. sudo dpkg -i capistrano_2.1.0-1_all.deb
3. apt-get install -f
http://git.ninjr.org/?p=code.git;a=tree;f=debian/capistrano
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=428879
http://svn.debian.org/wsvn/pkg-ruby-extras/packages-wip/capistrano/trunk
14. fastthread who?
$ cap –V
You are running Ruby 1.8.6, which has a bug in its
threading implementation. You are liable to encounter
deadlocks running Capistrano, unless you install the
fastthread library, which is available as a gem:
gem install fastthread
Wait, we’re installing a gem to fix a bug in ruby?
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=472702
This is fixed in ruby1.8 >= 1.8.6 p110 (1.8.6.111-2ubuntu1.1), no worries.
15. Using Capistrano invoke
Assumptions:
• You can access your servers via SSH
There is some kind of proxy gateway functionality too
–
You have the same password on all servers or PKI configured
•
$ cap HOSTS=quot;ots01, ots02, ots03quot; COMMAND=quot;whoamiquot; invoke
* executing `invoke‘
* executing quot;whoami“
servers: [quot;ots01quot;, quot;ots02quot;, quot;ots03quot;]
[ots01] executing command
[ots02] executing command
[ots03] executing command
** [out :: ots01] bryanm
** [out :: ots02] bryanm
** [out :: ots03] bryanm
command finished
16. Why use Capistrano when we have Puppet?
Heard during a Capistrano talk at OSCON
• Restart a particular service on multiple servers once
$ cap HOSTS=quot;ots01, ots02, ots03quot; COMMAND=“/etc/init.d/apache2 restartquot; invoke
• Check the state of a service or resource (memory, cpu) that isn’t monitored
$ cap HOSTS=quot;ots01, ots02, ots03quot; COMMAND=quot;grep MemTotal /proc/meminfoquot; invoke
• Run a command on multiple servers AND monitor it’s output
$ cap HOSTS=quot;ots01, ots02, ots03quot; COMMAND=“tail –f /var/log/apache2/error.logquot; invoke
• Systems deployment tasks: install puppet, build VMs, etc.
$ cap -S recipe=debian_client -S client=newbox01 build
18. Using Capistrano shell
Sure, but I can do that with ClusterSSH, right?
How about on fifty hosts? Programmatically?
$ cap -S recipe=iclassify -S query=quot;tag:ots-serverquot; COMMAND=quot;/etc/init.d/apache2
restartquot; SUDO=1 invoke
$ cap -S recipe=iclassify -S query=quot;tag:workstationquot; puppet
https://wiki.hjksolutions.com/display/IC/Capistrano+Task
19. http://loftninjas.org
“Parallel to the ‘Developer’ tribe in most organizations, often with a semi-antagonistic
mutual dependence, there was always another tribe: ‘Sysadmin’. When Developers
and Sysadmins got together, it sometimes felt like the dwarfs and high elves forced to
work together by necessity. (I’ll let you workout which is which.)”
Andrew Shafer – Reductive Labs
http://stochasticresonance.wordpress.com
