Fabric is a Python library and command-line tool for streamlining SSH administration tasks. It allows users to automate common deployment and administration tasks across multiple servers from the command line or Python scripts. Fabric provides tools for managing Python environments and packages, and can be used to parallelize tasks, group hosts, and interface with external APIs like GitHub from deployment scripts.

1. fabric – deployment tool
jslee

2. When I was in Yahoo!
• yinst impackage.tgz –h host[1-10]
• yinst yphp –upgrade v5.0 –h host[1-10] –
dist dist.corp.yahoo.com
• yinst yphp –downgrade v4.0 –h host[1-10]
–dist dist.corp.yahoo.com
• yinst – write in perl a deployment tool

3. Reinventing the wheel?

4. in python
• pip - is a tool for installing and managing
Python packages
• virtualenv - is a tool to create isolated
Python environments.
• fabric - is a Python (2.5 or higher) library
and command-line tool for streamlining
the use of SSH for application deployment
or systems administration tasks.

5. in Ruby
• RVM
• Bundler
• Capistrano

6. Why need deployment tool?
• Don't repeat yourself
• 1 human vs 1 Million machine
• once and only once

7. coding now!
• #fabfile.py
• from fabric.api import run
• def host_type():
• run('uname -s')

8. Execute now!
• $ fab -H localhost,linuxbox host_type
[localhost] run: uname -s
• [localhost] out: Darwin
• [linuxbox] run: uname -s
• [linuxbox] out: Linux
• Done.
• Disconnecting from localhost... done.
• Disconnecting from linuxbox... done.

9. • thats it !

10. its python code so
• 1. genrente hosts list by code
• for i in range(1, 11):
• env.hosts.append("host" + str(i))

11. • 2. use @parallel Decorator polling task
• @parallel(pool_size=2)
• def hello():
• import time
• sudo('uptime')
• time.sleep(3)

12. • 3.use @roles grouping ur hosts
• @roles('web')
• def hello_web():
• run('uptime')
• @roles('db')
• def hello_db():
• run('uptime')

13. • 4.use python library in task:
• import github2.client
• def _get_my_forks():
• #auto save user_name as .username
• user_name = None
• if os.path.isfile("./.username"):
• f = open('./.username', 'r')
• user_name = str(f.readline()).strip()
• user_name = prompt(color.green("Enter your github user name :
"), default=user_name)
• f = open('./.username', 'w')
• f.write(user_name)
• f.close()

14. others example
• 5. fab --list
• Available commands:
• apache_reload reload Apache on remote host
• apache_restart restart Apache on remote host
• bootstrap initialize remote host environment (virtualenv, dep...
• configtest Apache configuration
• create_virtualenv setup virtualenv on remote host
• deploy rsync code to remote host
• production use production environment on remote host
• staging use staging environment on remote host
• symlink_django create symbolic link so Apache can serve django adm...
• touch touch wsgi file to trigger reload
• update_apache_conf upload apache configuration to remote host
• update_requirements update external dependencies on remote host

15. my-forks
• https://github.com/jsleetw/my-forks
• simply use (fab update) to sync your
github forks repos with source repos

16. • demo