Setting up Phoenix with edeliver, distillery, and EC2

##### Replace 'example' anywhere with the name of your app and '*ec2ip*' with your ec2 instance ip
##### Set up your instance and make sure it's security group has ssh, http, and https open inbound and outbound
##### Don't forget to chmod 400 cert.pem

##### .deliver/config
APP="example"

BUILD_HOST="*ec2ip*"
BUILD_USER="elixir_builder"
BUILD_AT="/home/$BUILD_USER/edeliver/$APP/builds"

STAGING_HOSTS="*ec2ip*"
STAGING_USER="elixir_deployer"
DELIVER_TO="/home/elixir_deployer/$APP_staging"

# For *Phoenix* projects, symlink prod.secret.exs to our tmp source
pre_erlang_get_and_update_deps() {
  local _local_secret_config_file="./config/prod.secret.exs"
  if [ "$TARGET_MIX_ENV" = "prod" ]; then
    status "Copying '$_local_secret_config_file' file to build host"
    scp "$_local_secret_config_file" "$BUILD_USER@$BUILD_HOST:$BUILD_AT/config/prod.secret.exs"
  fi
}

pre_erlang_clean_compile() {
  status "Prparing assets with: brunch build and phoenix.digest"
  __sync_remote "
    # Runs the commands on the build host
    set -e
    cd '$BUILD_AT'
    mkdir -p priv/static
    npm install
    node_modules/.bin/brunch build --production
    app='$APP' MIX_ENV='$TARGET_MIX_ENV' $MIX_CMD phoenix.digest $SILENCE
  "
}

##### mix.exs
def application do
...
  applications: [:edeliver...
...
defp deps do
...
  {:distillery, ">= 0.8.0", warn_missing: false},
  {:edeliver, "~> 1.4.2"},
...

##### prod.secret.exs
config :example, Example.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "postgres",
  password: "postgres",
  hostname: "localhost",
  database: "example_prod",
  pool_size: 20


##### prod.exs
...
config :example, Example.Endpoint,
  http: [port: 8080],
  url: [host: "localhost", port: 8080],
  cache_static_manifest: "priv/static/manifest.json",
  root: ".",
  server: true,
  version: Mix.Project.config[:version]
...
config :phoenix, :serve_endpoints, true
...

mix do deps.get, compile
mix release.init

##### rel/config.exs

environment :prod do
  set include_erts: false
  set include_src: false
  set cookie: :"..."
end

##### SSH into your ec2 instance
ssh -i cert.pem ubuntu@*ec2ip*
sudo adduser elixir_builder --disabled-password
sudo su - elixir_builder
mkdir .ssh
chmod 700 .ssh
##### Copy ~/.ssh/id_rsa.pub on your local machine and paste it into
vi .ssh/authorized_keys
chmod 600 .ssh/authorized_keys
exit
##### Repeat the above steps for the user 'elixir_deployer'
##### Test ssh'ing works with
ssh elixir_deployer@*ec2ip*
exit
ssh elixir_builder@*ec2ip*
exit

##### Installing dependencies
ssh -i cert.pm ubuntu@*ec2ip*
wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb && sudo dpkg -i erlang-solutions_1.0_all.deb
sudo apt-get update
sudo apt-get install git esl-erlang elixir nginx postgresql postgresql-contrib build-essential
curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
sudo apt-get install nodejs
sudo su - postgres
psql
CREATE DATABASE example_prod WITH OWNER postgres;
ALTER USER postgres WITH PASSWORD 'postgres';
\q
exit

##### Build deployment
mix edeliver build release staging --verbose
mix edeliver deploy release to staging --verbose
mix edeliver start staging
mix edeliver migrate staging

##### Test it's working
ssh elixir_deployer@*ec2ip*
curl localhost:8080

##### Configure Nginx
ssh -i cert.pm ubuntu@*ec2ip*
sudo vi /etc/nginx/sites-available/example_prod

##### Input the following config
upstream example {
    server 127.0.0.1:8080;
}

map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

server{
    listen 80;
    server_name *ec2ip*;
    location / {
        try_files $uri @proxy;
    }

    location @proxy {
        include proxy_params;
        proxy_redirect off;
        proxy_pass http://example;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }
}
##### Exit with :wq and run the following
sudo ln -s /etc/nginx/sites-available/example_prod /etc/nginx/sites-enabled/
sudo rm /etc/nginx/sites-enabled/default
sudo nginx -t 
##### If the last command succeded, run
sudo service nginx restart
exit
##### Restart the server
mix edeliver restart staging

##### Test out your application from your local machine
curl *ec2ip*

##### To do a fresh update after incrementing the project version in mix.exs
mix edeliver update staging --to=<version>
mix edeliver restart staging
mix edeliver migrate staging

##### To do a live update
mix edeliver build upgrade --with=<old-version>
mix edeliver upgrade staging --to=<version>
mix edeliver migrate staging