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Configure Delayed_job for Rails3.x and Rails4.x

Elastic Beanstalk will execute any script in /opt/elasticbeanstalk/hooks/appdeploy/post after the web server is restarted. This means if you drop shell scripts in this directory they will be run. Please also refer the AWS Documentation for container_commands.

I have created a file name delayed_job.config in the .ebextensions folder in order to deploy a shell script that runs after the deployment gets over.

For RAILS 3.x

Below is my delayed_job.sh file for Rails 3.x

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commands:
  create_post_dir:
    command: "mkdir /opt/elasticbeanstalk/hooks/appdeploy/post"
    ignoreErrors: true
    
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/post/delayed_job.sh":
    mode: "000755"
    owner: root
    group: root
    content: |
      #!/usr/bin/env bash
      . /opt/elasticbeanstalk/support/envvars
      cd $EB_CONFIG_APP_CURRENT
      su -c "RAILS_ENV=production script/delayed_job --pid-dir=$EB_CONFIG_APP_SUPPORT/pids restart" $EB_CONFIG_APP_USER

For RAILS 4.x

Below is my delayed_job.sh file for Rails 4.x

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commands:
  create_post_dir:
    command: "mkdir /opt/elasticbeanstalk/hooks/appdeploy/post"
    ignoreErrors: true
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/post/delayed_job.sh":
    mode: "000755"
    owner: root
    group: root
    content: |
      #!/usr/bin/env bash
      . /opt/elasticbeanstalk/support/envvars
      cd $EB_CONFIG_APP_CURRENT
      su -c "RAILS_ENV=production bin/delayed_job  --pid-dir=$EB_CONFIG_APP_SUPPORT/pids restart" $EB_CONFIG_APP_USER

What this config do is:

  • Create the “post” directory if it doesn’t already exist, it ignores errors (If the directory already exists).
  • Deploy the shell script with the appropriate permission into the right directory.

What this shell script do is:

  • Setup the environment variables in ((/opt/elasticbeanstalk).
  • Restart delayed_job as per the app user (usually webapp), using a shared pids directory to make sure it will kill the old version first.

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