fabric-让部署变得简单
TRANSCRIPT
About
Fabric is a Python library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks
capistrano in python比capistrano更简单易学习，不需要有py经验不依赖版本控制系统
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Fabric is two things
Api for streamlining the use of ssh for app development or system management tasks
Command-line interface for calling python methods
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Install
sudo easy_install fabric
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Examplevim fabfile.py
#!/usr/bin/env pythonfrom fabric.api import env, run
env.hosts = ['xxx.com']env.user = 'eric'def du(): run("du -sh /home/eric")
Erics-MacBook:~ eric$ fab du[xxx.com] run: du -sh /home/eric[xxx.com] out: 942M/home/eric
Done.Disconnecting from xxx.com... done.
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Deploy my rails appErics-MacBook:~ eric$ cd NetBeans_Workspace/lxnengErics-MacBook:lxneng eric$ touch fabfile.pyErics-MacBook:lxneng eric$ vim fabfile.py#!/usr/bin/env python# encoding: utf-8
from fabric.api import env, run, cd, local, put
env.hosts = ['192.168.1.5']env.user = 'eric'DEPLOY_PATH = '/var/www/'APP_NAME = 'lxneng'APP_PATH = '%s%s'%(DEPLOY_PATH, APP_NAME)DATABASE_CONF_PATH = '/srv/conf/database.yml'
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pack & upload
def pack_code(): local('tar czf /tmp/%s.tgz .'%APP_NAME)
def upload_code(): put('/tmp/%s.tgz'%APP_NAME, '/tmp/') with cd(APP_PATH): run('tar xzf /tmp/%s.tgz'%APP_NAME)
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config & restartdef conf(): run("cp %s %s/config/"%(DATABASE_CONF_PATH, APP_PATH)) run("ln -nfs /srv/photos %s/public/photos"%APP_PATH) with cd(APP_PATH): run("rake db:migrate RAILS_ENV=production")
def restart(): run("touch %s/tmp/restart.txt"%APP_PATH)
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Deploydef deploy(): pack_code() upload_code() conf() restart()
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define rolesenv.roledefs = {
‘testing’: [‘192.168.1.5’],‘staging’: [‘.........’],‘production’: [‘......’, ‘........’],‘database’: [‘........’]
}
def testing():env.hosts = env.roledefs[‘testing’]env.user = ‘testuser’# ...
def deploy():# deploy code here
fab testing deploySunday, August 29, 2010
Fabric Commands
• require: Make sure that certain environment variables are available. • prompt: Display a prompt to the user and store the input in the given variable. Validation is optional. • put: Upload files to the remote host(s). • get: Download a file from a remote host. • run: Run a shell command on the remote host(s). • sudo: Run a root privileged shell command command on the remote host(s). • local: Run a command locally.
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Fabric Contrib Commands
• rsync_project: Synchronize a remote directory with the current project directory via rsync. • upload_project: Upload the current project to a remote system, tar-gzipping during the move.• exists: Return True if given path exists. • first: Given one or more file paths, returns first one found, or None. • upload_template: Render and upload a template text file to a remote host. • sed: Run a search-and-replace on filename with given regex patterns. • comment/uncomment: Attempt to (un)comment out all lines in filename matching regex. • contains: Return True if filename contains text. • append: Append string (or list of strings) text to filename. • confirm: Ask user a yes/no question and return their response as True /False.
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Fabric Decorators• hosts: Defines on which host or hosts to execute the wrapped function. • roles: Defines a list of role names, used to look up host lists. • runs_once: Prevents wrapped function from running more than once.
@hosts('user1@host1', 'host2', 'user2@host3') @runs_once def my_func(): pass
@roles('web')def my_other_func(): pass
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如果你有很多的app要部署那么你可以写一个通用一点的fabfile我的fabfile： http://gist.github.com/472566
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Reference
Fabric documentation http://fabfile.org/
Pythonic Deployment with Fabric 0.9
Fabric: A Capistrano Alternative
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Q & A
Thank You ！
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