Snakes on a Treadmill

Snakes on a TreadmillNoah Kantrowitz 2011-07-06

Chef• Configuration management• Deployment logic?• Best practices! (mostly• Not all Ruby code, I promise

Deploy Resource• Pull from source• Atomic updates via symlinks• Fast rollback• We all do this already, right?

Deploy Resourcedeploy_revision /srv/myapp do repo git@github.com/coderanger/myapp branch release user www-dataend

Folder Layout• /srv/myapp • /srv/myapp/shared • /srv/myapp/shared/releases • /srv/myapp/shared/releases/4faedb2ee... • /srv/myapp/shared/releases/9457be295... • ... • /srv/myapp/current

Resets purge_before_symlink []• Rails-specific defaults create_dirs_before_symlink []• :-( symlinks({}) symlink_before_migrate({})

Symlinks template /srv/myapp/shared/settings_local.py do source settings_local.py.erb vars ... end• Put config files in shared• ‘path/in/shared’ => ‘path/in/app’ deploy_revision /srv/myapp do ...• symlink vs. before_migrate symlink_before_migrate( settings_local.py=>conf/settings_local.py ) end

Migrations deploy_revision /srv/myapp do ... migrate true• Run migrations automatically migration_command /srv/myapp/shared/env/bin/python • Only on “master” machine? end /srv/myapp/current/manage.py syncdb --migrate migrate node[:roles].include? migrator

Packages• before_migrate deploy_revision /srv/myapp do• before_symlink ... before_migrate /srv/myapp/shared/env/bin/pip install -r • before_restart end /srv/myapp/current/requirements.txt• after_restart

NIH { "id": "myapp", "server_roles": [ "myapp" ], "type": { "myapp": [ "django" ] },• application::django "repository": "git@github.com:coderanger/myapp.git", "revision": {• http://ckbk.it/application }, "production": "release"• Data-driven deployment "databases": { "production": {• PyChef! "username": "db_user", "adapter": "postgres", "database": "production" } }, "owner": "www-data", "group": "www-data", "packages": { "curl": "7.19.5-1ubuntu2" },

Other Cookbooks• python • pip packages • python_virtualenv• application::gunicorn• postgres• nginx

Want More?• http://wiki.opscode.com/• http://community.opscode.com/cookbooks/• http://help.opscode.com/kb/otherhelp/build-a-django-stack• https://github.com/ericholscher/chef-django-example• My DjangoCon talk (hopefully!)

PyChef• pip install pychef import chef• Reads knife.rb or client.rb api = chef.autoconﬁgure()• chef.Object(‘id’) bag = chef.DataBag(applications)• chef.Object.list() item = bag[myapp]• obj.save() item[revision][production] = v1.1• obj.delete() item.save()

Search• Search(‘index’, ‘query’)• row.object import chef api = chef.autoconﬁgure() for row in chef.Search(node, role:myapp): print row.object[fqdn]

T-Shirts and stickers!

Noah Kantrowitz noah@opscode.com @kantrn

Snakes on a Treadmill

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