Elixir Releases

Getting Elxir deployed can be challenging. Especially if you want to do it the Erlang way. This talk provides some guidelines on what to take care of.

Transcript

1. Elixir Releases
   

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3. The Way
   /app/*.rb
   /lib/*.rb
   Gemfile
   $ install requirements
   $ export RAILS_ENV=production
   $ bundle install
   $ bundle exec rails server
   

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4. gjaldon/heroku-buildpack-phoenix-static
   HashNuke/heroku-buildpack-elixir
   

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5. ?
   

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6. Build Run
   $ mix deps.get
   $ mix release
   $ _build/app start
   app.tar.gz:
   - Binaries
   - Erlang runtime (optional)
   - Sources (optional)
   

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7. Watch
   Out
   

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8. Build Run
   $ mix deps.get
   $ mix release —env=prod
   $ _build/app start
   app.tar.gz
   
   
   
   
   
   

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9. $ docker run image_that_is_like_runtime build.sh
   

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10. $ _build/app start
    ** (Postgrex.Error) ERROR
    42P01 (undefined_table):
    relation "users" does not
    exist
    
    
    
    

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11. $ mix ecto.migrate
    -bash: mix: command not
    found
    
    
    

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12. $ _build/app migrate
    $ _build/app start
    https://github.com/bitwalker/distillery/blob/master/docs/Running%20Migrations.md
    

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13. Configuration
    staging
    demo
    testing
    sandbox
    production
    

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14. use Mix.Config
    config :app, App.Repo, [
    database: "app",
    username: "user",
    password: "supersecret",
    hostname: “db-server”,
    port: 5432,
    ]
    {'Elixir.QualityControl.Repo',
    [{database,<>},
    {username,<>},
    {password,<>},
    {hostname,<>},
    {loggers,[]},
    {port,5433}]},
    config.exs
    sys.config
    

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15. use Mix.Config
    config :app, App.Repo, [
    database: "app",
    username: “user",
    password:
    System.get_env(“PG_PASS"),
    hostname: “db-server”,
    port: 5432,
    ]
    config.exs
    sys.config
    {'Elixir.QualityControl.Repo',
    [{database,<>},
    {username,<>},
    {password,nil},
    {hostname,<>},
    {loggers,[]},
    {port,5433}]},
    

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16. Replace Variables on Build System
    {:system, ENV, default}
    Check In Credentials
    REPLACE_OS_VARS=true
    Build Config Layer
    

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17. Why
    

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18. Because it's cool?
    

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19. Size
    300 MB 50 MB
    

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20. Resources
    

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21. Code Reload
    

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22. Comfortable
    

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23. Start Early
    Think About Config
    Use Distillery
    

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