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PyCon US, 2013 Solid Python Application Deployments For Everybody Hynek Schlawack

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@hynek http://hynek.me http://github.com/hynek http://www.variomedia.de Hi!

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?

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AHEAD

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http://ox.cx/d The One & Only Link

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OPINIONS AHEAD

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PaaS Schema Migrations

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Key Concept

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easy ≠ simple

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“Simplicity is prerequisite for reliability.” — Edsger W. Dijkstra

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“…and security.” — Every Credible Security Expert Ever

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Put effort into making your deployments simple.

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Development

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Development

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No!

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“Python 2.4 is not supported. It came out 8 years ago. That's older than Youtube. Upgrade.” — Kenneth Reitz

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Stable Platform Key Infrastructure?

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But Hyyyn ek… My boss won’t let me!

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Development tests!

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אל

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spotty outdated loss of control System Package

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spotty outdated loss of control System Package

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spotty outdated loss of control System Package

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Use virtualen $ virtualenv venv; . venv/bin/activate $ pip install pyramid requests $ py.test … $ pip freeze >requirements.txt … $ pip install -r requirements.txt

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Pin Dep Hard “Django == 1.4.3” Don’t rely on SemVer! update w/ pip-tools

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But Hyyyn ek… SECURITY!

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Security‽ It’s your Job.

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Package It

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+ git

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+ git Ne!

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Fabric

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build tools repetitive downloads What’ Wrong‽

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.rpm .deb .pkg.tgz

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introspection CM integration versatile Native Package ‽

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1. check out from VCS 2. create virtualenv 3. install dependencies 4. do whatever you want 5. package result 6. push to your repo

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Abuse the Pipeline run tests LESS/SASS/CoffeeScript compression cache busting

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Packaging is hard! But Hyyyn ek…

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fpm Nope.

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But Hyyyn ek… repo server

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Rep Serve dpkg -i tar.bz2

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Automate!

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from … import Deployment def deb(branch=None): deploy = Deployment( 'whois', build_deps=['libpq-dev',], run_deps=['libpq5',]) deploy.prepare_app( branch=branch) deploy.build_deb()

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Lazy?

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There’ more than one way t d it…

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Configuration Management declarative describe the goal CM choses the path

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Solution prise-oriented features to to compare the two pet Open ource Puppet Enterprise ✔ ✔ ✔

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prise-oriented features to to compare the two pet Open ource Puppet Enterprise ✔ ✔ ✔ Not easy at all. Solution

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Why anyway? safety/security reproducible “later”

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safety/security reproducible “later” Why anyway?

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safety/security reproducible “later” Why anyway?

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Kate Heddleston This Room: 2:35 p.m.–3:05 p.m. Chef: Automating web application infrastructure

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Test It in Staging

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r t

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r t Nein!

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Just don’t.

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Privileged Port drop privileges authbind

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But Hyyyn ek… Need dat POWER!

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Single Purpose Worke celery rq zerorpc pb/AMP

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Be Paranoid /bin/false iptables file sockets REVOKE ALL SSL fail2ban

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/bin/false iptables file sockets REVOKE ALL SSL fail2ban Be Paranoid

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/bin/false iptables file sockets REVOKE ALL SSL fail2ban Be Paranoid

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/bin/false iptables file sockets REVOKE ALL SSL fail2ban Be Paranoid

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/bin/false iptables file sockets REVOKE ALL SSL fail2ban Be Paranoid

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/bin/false iptables file sockets REVOKE ALL SSL fail2ban Be Paranoid

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$ ./manage.py runserver ▌ [0] 0:bash*

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$ ./manage.py runserver ▌ [0] 0:bash* ᔒ༗!

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It’ Easy! upstart systemd supervisord circus …

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It’ Easy! upstart systemd supervisord circus …

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Example: upstart $ cat /etc/init/yourapp.conf start on static-network-up stop on deconfiguring-networking respawn chdir /path/to/yourapp setuid yourapp exec /path/to/gunicorn_django settings.py $ start yourapp

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+ mod_wsgi

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+ mod_wsgi Нет!

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Disclaime Using Apache is perfectly fine.

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Iff you decide consciously for it. Disclaime

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mod_wsgi

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mod_wsgi ? ?

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+ g or

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+ g or Better separation of Concerns.

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Easy t Set U : gunicorn $ gunicorn_django settings.py $ gunicorn_paster settings.ini

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$ cat settings.py … INSTALLED_APPS = ( … "gunicorn", ) … $ manage.py run_gunicorn Easy t Set U : gunicorn

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Easy t Set U : nginx location / { proxy_pass http://127.0.0.1:5000; } location /static/ { root /your/app/public/; }

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Graham Dumpleton This Room: 3:15 p.m.–3:45 p.m. Making Apache suck less for hosting Python web applications.

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Deploy!

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Ro back!

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Monito

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Monito

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Measure

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Measure statsd graphite scales

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got 1

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FIN http://ox.cx/d @hynek http://hynek.me http://vrmd.de