AWS Elastic Beanstalk Ruby 2.0/Puma Environment - .ebextensions tweaks and Sidekiq configuration. This is known to work fine with AWS Elastic Beanstalk 's 64bit Amazon Linux 2014.03 v1.0.1 running Ruby 2.0 (Puma) stack. Later stack versions might not work, but for that specific version works fine.

0000_packages.config

# Install Git needed for Git based gems
packages:
  yum:
    git: []
    

0001_fix_permissions.config

# Fixing permissions of packaged gems
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/pre/10_fixing_permission.sh":
    content: |
        #!/usr/bin/env bash

        . /opt/elasticbeanstalk/containerfiles/envvars

        CACHE_GEM_DIR=$EB_CONFIG_APP_ONDECK/vendor/cache

        if [ -d $CACHE_GEM_DIR ]
        then
          chown -R webapp:webapp $CACHE_GEM_DIR
          echo "Modified the owner of $CACHE_GEM_DIR files"
        else
          echo "Nothing in $CACHE_GEM_DIR"
        fi

        true
    mode: "000755"

0002_bundle_pack.config

# Modified system bundle script to run 'bundle package'
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/pre/10_bundle_install.sh":
    content: |
        #!/usr/bin/env bash

        . /opt/elasticbeanstalk/containerfiles/envvars

        cd $EB_CONFIG_APP_ONDECK

        if [ -f Gemfile ]
        then
          echo "running 'bundle install' with Gemfile:"
          cat Gemfile

          if [ -d $EB_CONFIG_APP_ONDECK/vendor/cache ] 
          then
            /usr/local/bin/bundle install --local
            # Incase there is a gem that is missing from the cache
            /usr/local/bin/bundle pack --all
            /usr/local/bin/bundle install
          else 
            /usr/local/bin/bundle pack --all
            /usr/local/bin/bundle install
          fi 

          if [ $? != 0 ]
          then
            echo "ERROR: bundle install failed!"
            exit 1
          else
            echo "bundle install succeeded"
          fi

        else
          echo "no Gemfile found! Skipping bundle install stage!"
        fi

        if [ -f Gemfile.lock ]
        then
          echo "encountered a Gemfile.lock, setting proper permissions"
          chown $EB_CONFIG_APP_USER:$EB_CONFIG_APP_USER Gemfile.lock
        else
          echo "no Gemfile.lock file found, so no permissions to set on it";
        fi

        true
    mode: "000755"

0003_sidekiq.config

# Sidekiq interaction and startup script
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/post/50_restart_sidekiq":
    mode: "000755"
    content: |
      #!/bin/bash

      . /opt/elasticbeanstalk/containerfiles/envvars

      PIDFILE=$EB_CONFIG_APP_PIDS/sidekiq.pid

      cd $EB_CONFIG_APP_CURRENT

      if [ -f $PIDFILE ]
      then
        SIDEKIQ_LIVES=$(/bin/ps -o pid= -p `cat $PIDFILE`)
          if [ -z $SIDEKIQ_LIVES ]
          then
             rm -rf $PIDFILE
          else
             kill -TERM `cat $PIDFILE`
             sleep 10
             rm -rf $PIDFILE
          fi
      fi

      BUNDLE=/usr/local/bin/bundle
      SIDEKIQ=/usr/local/bin/sidekiq

      $BUNDLE exec $SIDEKIQ \
        -e production \
        -P /var/app/containerfiles/pids/sidekiq.pid \
        -C /var/app/current/config/sidekiq.yml \
        -L /var/app/containerfiles/logs/sidekiq.log \
        -d

  "/opt/elasticbeanstalk/hooks/appdeploy/pre/03_mute_sidekiq":
    mode: "000755"
    content: |
      #!/bin/bash

      . /opt/elasticbeanstalk/containerfiles/envvars

      PIDFILE=$EB_CONFIG_APP_PIDS/sidekiq.pid

      if [ -f $PIDFILE ]
      then
        SIDEKIQ_LIVES=$(/bin/ps -o pid= -p `cat $PIDFILE`)
          if [ -z $SIDEKIQ_LIVES ]
          then
             rm -rf $PIDFILE
          else
             kill -USR1 `cat $PIDFILE`
             sleep 10
          fi
      fi

0004_rubylibs.config

# Globally include the vendor/cache gem location and the location of puma_http11 gem
files:
  "/opt/elasticbeanstalk/containerfiles/envvars.d/appenv":
    content: |
     export RUBYLIB=$RUBYLIB:/var/app/current/vendor/cache:/usr/local/lib64/ruby/gems/2.0/gems/puma-2.8.1/lib/
    mode: "000644"