Свежий опыт использования PaaS Heroku для развертывания приложения на платформе Ruby on Rails 4

1. Хокку про Heroku
Сергей Селецкий
@sseletskyy
Европейское Агентство Высоких Технологий
http://www.foss-sea.org.ua/
2013

2. Что такое Paas
(Product as a Service)
Cloud сервер + Agile + масштабирование

3. Что такое Paas
(Product as a Service)
с финансовой точки зрения
● нет затрат на покупку серверов
● на покупку серверного ПО
● на зарплату администратора
● ежемесячная оплата услуг PaaS

4. GIT
SOURCE
CODE
HEROKU
$ git push heroku your_branch:master

5. $ heroku ps:scale web=1 worker=1
LOAD
BALANCER
HEROKU
STATELESS
INSTANCE
WEB
DYNO
PostgreSQL
STATELESS
INSTANCE
WORKER
DYNO

6. $ heroku ps:scale web=2 worker=2
LOAD
BALANCER
HEROKU
STATELESS
STATELESS
INSTANCE
INSTANCE
WEB
DYNO
DYNO
PostgreSQL
STATELESS
STATELESS
INSTANCE
INSTANCE
WORKER
DYNO
DYNO

7. $ heroku ps:scale web=3 worker=3
LOAD
BALANCER
HEROKU
STATELESS
STATELESS
INSTANCE
STATELESS
INSTANCE
INSTANCE
DYNO
WEB
DYNO
DYNO
PostgreSQL
STATELESS
STATELESS
INSTANCE
STATELESS
INSTANCE
INSTANCE
DYNO
WORKER
DYNO
DYNO

8. $ heroku ps:scale web=5 worker=5
LOAD
BALANCER
HEROKU
STATELESS
STATELESS
INSTANCE
STATELESS
INSTANCE
STATELESS
INSTANCE
STATELESS
INSTANCE
DYNO
INSTANCE
DYNO
DYNO
WEB
DYNO
DYNO
PostgreSQL
STATELESS
STATELESS
INSTANCE
STATELESS
INSTANCE
STATELESS
INSTANCE
STATELESS
INSTANCE
DYNO
INSTANCE
DYNO
DYNO
WORKER
DYNO
DYNO

16. ==> heroku login
Enter your Heroku credentials.
Email: gustotune@gmail.com
Password (typing will be hidden):
Found the following SSH public keys:
1) id_rsa.pub
2) id_rsa_cloud.pub
Which would you like to use with your Heroku account?
2
Uploading SSH public key /Users/gustotune/.
ssh/id_rsa_cloud.pub... failed
! This key is already in use by another account. Each
account must have a unique key.

17. /Users/gustotune
==> ssh-keygen -t rsa -C "gustotune@gmail.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/gustotune/.
ssh/id_rsa): id_rsa_gustotune
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in id_rsa_gustotune.
Your public key has been saved in id_rsa_gustotune.
pub.
/Users/gustotune
==> mv id_rsa_gustotune* .ssh/

18. /Users/gustotune
==> heroku login
Enter your Heroku credentials.
Email: gustotune@gmail.com
Password (typing will be hidden): password is here
Found the following SSH public keys:
1) id_rsa.pub
2) id_rsa_cloud.pub
3) id_rsa_gustotune.pub
Which would you like to use with your Heroku account? 3
Uploading SSH public key /Users/gustotune/.
ssh/id_rsa_gustotune.pub... done
Authentication successful.

21. /Users/gustotune/rails_app
==> git config -e
# комментарий: добавить три строчки в конец файла
[remote "foss-sea"]
url = git@heroku.com:foss-sea.git
fetch = +refs/heads/*:refs/remotes/heroku/*
или тоже самое одной командой
==> heroku git:remote -a foss-sea -r foss-sea
где -a - это название приложения
-r - это git remote name (‘heroku’ по умолчанию)

22. /Users/gustotune/rails_app
==> git push foss-sea heroku:master
foss-sea = remote git repo in git config
heroku = our local branch (локальная ветка)
master = default branch at foss-sea
еще примеры
==> git push foss-sea master:master
==> git push foss-sea release_1.0:master

23. ==> git push foss-sea heroku:master
Counting objects: 8212, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2822/2822), done.
Writing objects: 100% (8212/8212), 9.68 MiB | 74.00 KiB/s, done.
Total 8212 (delta 5114), reused 8101 (delta 5027)
-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.0.0
-----> Installing dependencies using Bundler version 1.3.2
New app detected loading default bundler cache
Running: bundle install --without development:test --path vendor/bundle --binstubs
vendor/bundle/bin --deployment
Fetching source index from https://rubygems.org/
Asset precompilation completed (28.32s)
Cleaning assets
-----> Discovering process types
Procfile declares types -> web
Default types for Ruby -> console, rake, worker
-----> Compiled slug size: 55.3MB
-----> Launching... done, v5
http://foss-sea.herokuapp.com deployed to Heroku
To git@heroku.com:foss-sea.git
* [new branch]
heroku -> master

26. Подготовка базы данных
/Users/gustotune/rails_app
==> heroku run rake db:version
Running `rake db:version` attached to terminal... up, run.9905
Current version: 0
/Users/gustotune/rails_app
==> heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.7096
Migrating to DeviseCreateUsers (20130910211249)
== DeviseCreateUsers: migrating
==============================================
-- create_table(:users)
-> 0.0398s
-- add_index(:users, :email, {:unique=>true})
-> 0.0203s
-- add_index(:users, :reset_password_token, {:unique=>true})
-> 0.0260s
-- add_index(:users, :confirmation_token, {:unique=>true})
-> 0.0222s
== DeviseCreateUsers: migrated (0.1091s)
...

27. БИНГО ;)

28. Работа с дополнениями
add-ons

35. /Users/gustotune/rails_app
==> heroku addons:add logentries
Adding logentries on foss-sea... failed
! Please verify your account to install this add-on
! For more information, see http://devcenter.heroku.com/categories/billing
! Verify now at https://heroku.com/verify
==> heroku addons:add newrelic:stark
Adding newrelic:stark on foss-sea... done, v7 (free)
Use `heroku addons:docs newrelic` to view documentation.
==> heroku addons:add pgbackups:auto-month
Adding pgbackups:auto-month on foss-sea... done, v8 (free)
You can now use "pgbackups" to backup your databases or import an external
backup.
Use `heroku addons:docs pgbackups` to view documentation.
==> heroku addons:add rollbar
Adding rollbar on foss-sea... done, v9 (free)
Use `heroku addons:docs rollbar` to view documentation.
==> heroku addons:add sendgrid
Adding sendgrid on foss-sea... done, v10 (free)
Use `heroku addons:docs sendgrid` to view documentation.

37. Настройка дополнений
и переменных
окружения

38. > heroku config:set MAILER_URL=foss-sea.herokuapp.com
или так если используется собственный домен
> heroku config:set MAILER_URL=foss-sea.custom-domain.io

39. Примеры дополнений

45. Играем с
масштабированием и
ценой

50. Полезные команды

51. ==> heroku ps # возвращает список работающих копий приложения
=== web (1X): `bundle exec passenger start -p $PORT --max-pool-size 2`
web.1: up 2013/11/29 01:02:25 (~ 46m ago)
==> heroku ps:scale web=2 worker=1
Scaling web processes... done, now running 2
Scaling worker processes... done, now running 1
==> heroku run bash # получить доступ к консоли сервера
==> heroku run rails c # получить доступ к консоли приложения
==> heroku run rake [your_rake_task] # вызвать rake задачу [your_rake_task]
==> heroku logs --tail #просмотреть логи
==> heroku labs:enable user-env-compile # решает ряд проблем при сборке
==> heroku fork -a foss-sea foss-sea-copy # делает полную копию приложения
==> heroku maintenance:on
Enabling maintenance mode for foss-sea... done

52. Восстановление после неудачного обновления

53. Спасибо
Сергей Селецкий
@sseletskyy