Skip to content

Instantly share code, notes, and snippets.

@cyberdelia
Created April 3, 2010 14:05
Show Gist options
  • Save cyberdelia/354506 to your computer and use it in GitHub Desktop.
Save cyberdelia/354506 to your computer and use it in GitHub Desktop.
Fabric deploy script with : south migrations, rollback and maintenance page.
from fabric.api import env, run, sudo, local, put
def production():
"""Defines production environment"""
env.user = "deploy"
env.hosts = ['example.com',]
env.base_dir = "/var/www"
env.app_name = "app"
env.domain_name = "app.example.com"
env.domain_path = "%(base_dir)s/%(domain_name)s" % { 'base_dir':env.base_dir, 'domain_name':env.domain_name }
env.current_path = "%(domain_path)s/current" % { 'domain_path':env.domain_path }
env.releases_path = "%(domain_path)s/releases" % { 'domain_path':env.domain_path }
env.shared_path = "%(domain_path)s/shared" % { 'domain_path':env.domain_path }
env.git_clone = "git@github.com:example/app.git"
env.env_file = "deploy/production.txt"
def releases():
"""List a releases made"""
env.releases = sorted(run('ls -x %(releases_path)s' % { 'releases_path':env.releases_path }).split())
if len(env.releases) >= 1:
env.current_revision = env.releases[-1]
env.current_release = "%(releases_path)s/%(current_revision)s" % { 'releases_path':env.releases_path, 'current_revision':env.current_revision }
if len(env.releases) > 1:
env.previous_revision = env.releases[-2]
env.previous_release = "%(releases_path)s/%(previous_revision)s" % { 'releases_path':env.releases_path, 'previous_revision':env.previous_revision }
def start():
"""Start the application servers"""
sudo("/etc/init.d/apache2 start")
def restart():
"""Restarts your application"""
sudo("/etc/init.d/apache2 force-reload")
def stop():
"""Stop the application servers"""
sudo("/etc/init.d/apache2 stop")
def permissions():
"""Make the release group-writable"""
sudo("chmod -R g+w %(domain_path)s" % { 'domain_path':env.domain_path })
sudo("chown -R www-data:www-data %(domain_path)s" % { 'domain_path':env.domain_path })
def setup():
"""Prepares one or more servers for deployment"""
run("mkdir -p %(domain_path)s/{releases,shared}" % { 'domain_path':env.domain_path })
run("mkdir -p %(shared_path)s/{system,log,index}" % { 'shared_path':env.shared_path })
permissions()
def checkout():
"""Checkout code to the remote servers"""
from time import time
env.current_release = "%(releases_path)s/%(time).0f" % { 'releases_path':env.releases_path, 'time':time() }
run("cd %(releases_path)s; git clone -q -o deploy --depth 1 %(git_clone)s %(current_release)s" % { 'releases_path':env.releases_path, 'git_clone':env.git_clone, 'current_release':env.current_release })
def update():
"""Copies your project and updates environment and symlink"""
update_code()
update_env()
symlink()
permissions()
def update_code():
"""Copies your project to the remote servers"""
checkout()
permissions()
def symlink():
"""Updates the symlink to the most recently deployed version"""
if not env.has_key('current_release'):
releases()
run("ln -nfs %(current_release)s %(current_path)s" % { 'current_release':env.current_release, 'current_path':env.current_path })
run("ln -nfs %(shared_path)s/log %(current_release)s/log" % { 'shared_path':env.shared_path, 'current_release':env.current_release })
run("ln -nfs %(shared_path)s/index %(current_release)s/index" % { 'shared_path':env.shared_path, 'current_release':env.current_release })
run("ln -nfs %(shared_path)s/cdlm.db %(current_release)s/cdlm.db" % { 'shared_path':env.shared_path, 'current_release':env.current_release })
run("ln -nfs %(shared_path)s/system/local.py %(current_release)s/%(app_name)s/local.py" % { 'shared_path':env.shared_path, 'current_release':env.current_release, 'app_name':env.app_name })
run("ln -nfs %(current_release)s/env/src/django/django/contrib/admin/media %(current_release)s/%(app_name)s/media/admin" % { 'current_release':env.current_release, 'app_name':env.app_name })
def update_env():
"""Update servers environment on the remote servers"""
if not env.has_key('current_release'):
releases()
run("cd %(current_release)s; virtualenv --no-site-packages --unzip-setuptools env" % { 'current_release':env.current_release })
run("pip -q install -E %(current_release)s/env -r %(current_release)s/%(env_file)s" % { 'current_release':env.current_release, 'env_file':env.env_file })
permissions()
def migrate():
"""Run the migrate task"""
if not env.has_key('current_release'):
releases()
run("source %(current_release)s/env/bin/activate; cd %(current_release)s; python %(app_name)s/manage.py migrate" % { 'current_release':env.current_release, 'app_name':env.app_name })
def migrations():
"""Deploy and run pending migrations"""
update_code()
update_env()
migrate()
symlink()
restart()
def cleanup():
"""Clean up old releases"""
if not env.has_key('releases'):
releases()
if len(env.releases) > 3:
directories = env.releases
directories.reverse()
del directories[:3]
env.directories = ' '.join([ "%(releases_path)s/%(release)s" % { 'releases_path':env.releases_path, 'release':release } for release in directories ])
run("rm -rf %(directories)s" % { 'directories':env.directories })
def enable():
"""Makes the application web-accessible again"""
run("rm %(shared_path)s/system/maintenance.html" % { 'shared_path':env.shared_path })
def disable(**kwargs):
"""Present a maintenance page to visitors"""
import os, datetime
from django.conf import settings
try:
settings.configure(
DEBUG=False, TEMPLATE_DEBUG=False,
TEMPLATE_DIRS=(os.path.join(os.getcwd(), 'templates/'),)
)
except EnvironmentError:
pass
from django.template.loader import render_to_string
env.deadline = kwargs.get('deadline', None)
env.reason = kwargs.get('reason', None)
open("maintenance.html", "w").write(
render_to_string("maintenance.html", { 'now':datetime.datetime.now(), 'deadline':env.deadline, 'reason':env.reason }).encode('utf-8')
)
put('maintenance.html', '%(shared_path)s/system/maintenance.html' % { 'shared_path':env.shared_path })
local("rm maintenance.html")
def rollback_code():
"""Rolls back to the previously deployed version"""
if not env.has_key('releases'):
releases()
if len(env.releases) >= 2:
env.current_release = env.releases[-1]
env.previous_revision = env.releases[-2]
env.current_release = "%(releases_path)s/%(current_revision)s" % { 'releases_path':env.releases_path, 'current_revision':env.current_revision }
env.previous_release = "%(releases_path)s/%(previous_revision)s" % { 'releases_path':env.releases_path, 'previous_revision':env.previous_revision }
run("rm %(current_path)s; ln -s %(previous_release)s %(current_path)s && rm -rf %(current_release)s" % { 'current_release':env.current_release, 'previous_release':env.previous_release, 'current_path':env.current_path })
def rollback():
"""Rolls back to a previous version and restarts"""
rollback_code()
restart()
def cold():
"""Deploys and starts a `cold' application"""
update()
migrate()
start()
def deploy():
"""Deploys your project. This calls both `update' and `restart'"""
update()
restart()
@romansemko
Copy link

Should add migrate() to the rollback() function in order to rollback any possible migrations.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment