Heroku 101 py con 2015 - David Gouldin
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Heroku is an application platform that allows developers to build, run, and operate applications entirely in the cloud. The document provides an overview of building a simple Flask application on Heroku, including installing the Heroku Toolbelt, creating a virtual environment, writing code, committing to Git, and deploying the application to Heroku. It also covers key Heroku concepts like the Twelve-Factor App methodology, configuring variables, managing releases, adding addons like Redis, scaling dynos, and viewing logs and metrics.
![lanyrd.com/sdmbmk
import os
import redis
from flask import Flask
!
app = Flask(__name__)
db = redis.from_url(os.environ['REDISCLOUD_URL'])
!
@app.route('/')
def hello():
name = db.get(‘name') or 'World'
return 'Hello %s!' % name
!
@app.route('/setname/<name>')
def setname(name):
db.set('name', name)
return 'Name updated.'
hello.py](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-49-320.jpg)
![lanyrd.com/sdmbmk
$ foreman start
13:03:34 web.1 | started with pid 24492
...
13:03:34 web.1 | 2015-04-07 13:03:34 [24495] [ERROR] Exception in worker process:
13:03:34 web.1 | Traceback (most recent call last):
...
13:03:34 web.1 | KeyError: 'REDISCLOUD_URL'
...
13:03:34 web.1 | 2015-04-07 13:03:34 [24495] [INFO] Worker exiting (pid: 24495)
13:03:34 web.1 | 2015-04-07 13:03:34 [24492] [INFO] Shutting down: Master
13:03:34 web.1 | 2015-04-07 13:03:34 [24492] [INFO] Reason: Worker failed to boot.
13:03:34 web.1 | exited with code 3
13:03:34 system | sending SIGTERM to all processes
SIGTERM received
Uh oh…](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-54-320.jpg)
![lanyrd.com/sdmbmk
$ heroku labs:enable log-runtime-metrics
$ heroku restart
!
$ heroku logs --tail
2015-04-07T17:19:30.746857+00:00 heroku[web.1]: source=web.1 dyno=heroku.
23939571.b4d17f84-50f5-4e2f-9fb1-b2124db4addb sample#memory_total=17.86MB
sample#memory_rss=17.85MB sample#memory_cache=0.00MB sample#memory_swap=0.00MB
sample#memory_pgpgin=5311pages sample#memory_pgpgout=740pages
!
2015-04-07T17:19:50.787234+00:00 heroku[web.1]: source=web.1 dyno=heroku.
23939571.b4d17f84-50f5-4e2f-9fb1-b2124db4addb sample#memory_total=17.86MB
sample#memory_rss=17.85MB sample#memory_cache=0.00MB sample#memory_swap=0.00MB
sample#memory_pgpgin=5311pages sample#memory_pgpgout=740pages
log-runtime-metrics](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-60-320.jpg)
]
(https://heroku.com/deploy?template=https://github.com/
dgouldin/django-playground)](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-74-320.jpg)
![lanyrd.com/sdmbmk
>>> import json
>>> import requests # python-requests.org
!
>>> heroku = requests.session()
>>> heroku.auth = ('', '{INSERT HEROKU API TOKEN HERE}')
>>> heroku.headers['Accept'] = 'application/vnd.heroku+json; version=3'
>>> heroku.headers['Content-Type'] = 'application/json'
REST API basics](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-77-320.jpg)
![lanyrd.com/sdmbmk
>>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015').json()
{u'archived_at': None,
...
u'web_url': u'http://dgouldin.herokuapp.com/'}
!
>>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015/config-vars').json()
[35] :
{u'NAME': u'David',
u'REDISCLOUD_URL': u'{REDACTED}'}
!
>>> body = json.dumps({'NAME': 'Robot'})
>>> heroku.patch('https://api.heroku.com/apps/happy-pycon-2015/config-vars', body)
App info; config vars](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-78-320.jpg)
![lanyrd.com/sdmbmk
>>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015/formation').json()
[{u'command': u'gunicorn hello:app',
u'created_at': u'2015-04-06T16:42:24Z',
u'id': u'928f6618-a0e2-4ded-95ec-e3a23a7795f0',
u'quantity': 2,
u'size': u'1X',
u'type': u'web',
u'updated_at': u'2015-04-06T18:50:02Z'}]
!
>>> body = json.dumps({'quantity': 4})
>>> heroku.patch('https://api.heroku.com/apps/dgouldin/formation/web', body)
Scaling](https://image.slidesharecdn.com/heroku101-pycon2015-150416135139-conversion-gate01/85/Heroku-101-py-con-2015-David-Gouldin-79-320.jpg)
Heroku 101 py con 2015 - David Gouldin
- 2. lanyrd.com/sdmbmk What is Heroku? The application platform
- 3. lanyrd.com/sdmbmk You write your app. We do the rest.
- 5. lanyrd.com/sdmbmk 5 Billion requests per day 3+ Million Apps Created 125+ Add-on services
- 9. lanyrd.com/sdmbmk Assumptions You want to learn about Heroku. You know (a bit) of Python. You have Python, pip, and virtualenv*.
- 14. lanyrd.com/sdmbmk Create a Flask app devcenter.heroku.com/articles/getting-started-with-python
- 15. lanyrd.com/sdmbmk $ mkdir hello-heroku $ cd hello-heroku $ virtualenv venv $ source venv/bin/activate $ pip install Flask gunicorn Create a vitualenv and install requirements
- 16. lanyrd.com/sdmbmk import os from flask import Flask ! app = Flask(__name__) ! @app.route('/') def hello(): return 'Hello World!' hello.py
- 19. lanyrd.com/sdmbmk $ foreman start Start the app
- 21. lanyrd.com/sdmbmk $ pip freeze > requirements.txt Freeze dependencies
- 23. lanyrd.com/sdmbmk Store the app in git devcenter.heroku.com/articles/git
- 25. lanyrd.com/sdmbmk $ git init $ git add . $ git commit -m "initial commit" Store the app in git
- 27. lanyrd.com/sdmbmk Create and deploy the application
- 28. lanyrd.com/sdmbmk $ heroku create $ git push heroku master ... -----> Launching... done, v2 http://happy-pycon-2015.herokuapp.com deployed to Heroku $ heroku open Create and deploy the app
- 29. lanyrd.com/sdmbmk V. Build, release, run 12factor.net/build-release-run
- 31. lanyrd.com/sdmbmk $ heroku logs --tail Viewing logs
- 32. lanyrd.com/sdmbmk import os from flask import Flask ! app = Flask(__name__) ! import logging logging.basicConfig(level=logging.DEBUG) ! @app.route('/') def hello(): logging.info("saying hello") return 'Hello World!' hello.py
- 33. lanyrd.com/sdmbmk $ git add . $ git commit -m "add logging" $ git push heroku master Commit and deploy again
- 34. lanyrd.com/sdmbmk $ heroku logs --tail Viewing logs
- 35. lanyrd.com/sdmbmk XI. Logs as event streams 12factor.net/
- 37. lanyrd.com/sdmbmk import os import logging from flask import Flask ! app = Flask(__name__) logging.basicConfig(level=logging.DEBUG) ! @app.route('/') def hello(): logging.info("saying hello") name = os.environ.get('NAME', 'World') return 'Hello {}!'.format(name) hello.py
- 38. lanyrd.com/sdmbmk $ NAME=David foreman start Try it out locally
- 39. lanyrd.com/sdmbmk $ echo "NAME=David" > .env Store local env vars in .env (don’t forget to add it to .gitignore)
- 40. lanyrd.com/sdmbmk $ foreman start Try it out locally
- 41. lanyrd.com/sdmbmk $ git add . $ git commit -m "add name" $ git push heroku master Commit and deploy
- 42. lanyrd.com/sdmbmk $ heroku config:set NAME=David Setting config vars and restarting happy-pycon-2015... done, v6 ! $ heroku config:get NAME David ! $ heroku config === happy-pycon-2015 Config Vars NAME: David ! $ heroku config:unset NAME Unsetting NAME and restarting happy-pycon-2015... done, v7 Managing config vars
- 43. lanyrd.com/sdmbmk III. Store config in the environment 12factor.net/
- 45. lanyrd.com/sdmbmk $ heroku releases === happy-pycon-2015 Releases v7 Remove NAME config vars dgouldin@heroku.com 2015/04/07 12:41:49 v6 Deploy df3cf06 dgouldin@heroku.com 2015/04/07 12:40:32 v5 Set NAME config vars dgouldin@heroku.com 2015/04/07 12:35:30 v4 Deploy 5bebf9b dgouldin@heroku.com 2015/04/07 12:34:27 v3 Deploy 69398b3 dgouldin@heroku.com 2015/04/07 12:18:08 v2 Enable Logplex dgouldin@heroku.com 2015/04/07 12:16:20 v1 Initial release dgouldin@heroku.com 2015/04/07 12:16:17 Release history
- 46. lanyrd.com/sdmbmk I. One codebase, many deploys 12factor.net/
- 48. lanyrd.com/sdmbmk $ heroku addons:create rediscloud Adding rediscloud on happy-pycon-2015... done, v8 (free) Use `heroku addons:docs rediscloud` to view documentation. Adding an addon
- 49. lanyrd.com/sdmbmk import os import redis from flask import Flask ! app = Flask(__name__) db = redis.from_url(os.environ['REDISCLOUD_URL']) ! @app.route('/') def hello(): name = db.get(‘name') or 'World' return 'Hello %s!' % name ! @app.route('/setname/<name>') def setname(name): db.set('name', name) return 'Name updated.' hello.py
- 50. lanyrd.com/sdmbmk IV. Treat backing services as attached resources 12factor.net/
- 51. lanyrd.com/sdmbmk $ pip install redis $ pip freeze > requirements.txt Dependencies
- 52. lanyrd.com/sdmbmk $ git add . $ git commit -m "use redis for name" $ git push heroku master Commit and deploy
- 54. lanyrd.com/sdmbmk $ foreman start 13:03:34 web.1 | started with pid 24492 ... 13:03:34 web.1 | 2015-04-07 13:03:34 [24495] [ERROR] Exception in worker process: 13:03:34 web.1 | Traceback (most recent call last): ... 13:03:34 web.1 | KeyError: 'REDISCLOUD_URL' ... 13:03:34 web.1 | 2015-04-07 13:03:34 [24495] [INFO] Worker exiting (pid: 24495) 13:03:34 web.1 | 2015-04-07 13:03:34 [24492] [INFO] Shutting down: Master 13:03:34 web.1 | 2015-04-07 13:03:34 [24492] [INFO] Reason: Worker failed to boot. 13:03:34 web.1 | exited with code 3 13:03:34 system | sending SIGTERM to all processes SIGTERM received Uh oh…
- 55. lanyrd.com/sdmbmk Some solutions: Only run remotely Homebrew - brew.sh Vagrant - vagrantup.com Docker - docker.io
- 57. lanyrd.com/sdmbmk $ heroku ps:scale web=2 Scaling dynos... done, now running web at 2:1X. ! $ heroku ps:scale web=10 Scaling dynos... done, now running web at 10:1X. ! $ heroku ps:scale web=5:2X Scaling dynos... done, now running web at 5:2X. ! $ heroku ps:scale web=1:PX Scaling dynos... done, now running web at 1:PX. ! $ heroku ps:scale web=1:1X Scaling dynos... done, now running web at 1:1X. Scaling
- 59. lanyrd.com/sdmbmk VIII. Concurrency via processes 12factor.net/
- 60. lanyrd.com/sdmbmk $ heroku labs:enable log-runtime-metrics $ heroku restart ! $ heroku logs --tail 2015-04-07T17:19:30.746857+00:00 heroku[web.1]: source=web.1 dyno=heroku. 23939571.b4d17f84-50f5-4e2f-9fb1-b2124db4addb sample#memory_total=17.86MB sample#memory_rss=17.85MB sample#memory_cache=0.00MB sample#memory_swap=0.00MB sample#memory_pgpgin=5311pages sample#memory_pgpgout=740pages ! 2015-04-07T17:19:50.787234+00:00 heroku[web.1]: source=web.1 dyno=heroku. 23939571.b4d17f84-50f5-4e2f-9fb1-b2124db4addb sample#memory_total=17.86MB sample#memory_rss=17.85MB sample#memory_cache=0.00MB sample#memory_swap=0.00MB sample#memory_pgpgin=5311pages sample#memory_pgpgout=740pages log-runtime-metrics
- 68. lanyrd.com/sdmbmk And many more … addons.heroku.com
- 72. lanyrd.com/sdmbmk Heroku Button 1 click to a deployed Heroku app
- 77. lanyrd.com/sdmbmk >>> import json >>> import requests # python-requests.org ! >>> heroku = requests.session() >>> heroku.auth = ('', '{INSERT HEROKU API TOKEN HERE}') >>> heroku.headers['Accept'] = 'application/vnd.heroku+json; version=3' >>> heroku.headers['Content-Type'] = 'application/json' REST API basics
- 78. lanyrd.com/sdmbmk >>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015').json() {u'archived_at': None, ... u'web_url': u'http://dgouldin.herokuapp.com/'} ! >>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015/config-vars').json() [35] : {u'NAME': u'David', u'REDISCLOUD_URL': u'{REDACTED}'} ! >>> body = json.dumps({'NAME': 'Robot'}) >>> heroku.patch('https://api.heroku.com/apps/happy-pycon-2015/config-vars', body) App info; config vars
- 79. lanyrd.com/sdmbmk >>> heroku.get('https://api.heroku.com/apps/happy-pycon-2015/formation').json() [{u'command': u'gunicorn hello:app', u'created_at': u'2015-04-06T16:42:24Z', u'id': u'928f6618-a0e2-4ded-95ec-e3a23a7795f0', u'quantity': 2, u'size': u'1X', u'type': u'web', u'updated_at': u'2015-04-06T18:50:02Z'}] ! >>> body = json.dumps({'quantity': 4}) >>> heroku.patch('https://api.heroku.com/apps/dgouldin/formation/web', body) Scaling
- 80. lanyrd.com/sdmbmk Questions and Free Play dgouldin@heroku.com @dgouldin