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AWS OpsWorks
User Guide (API Version 2013-02-18)

Adding Apps

The first step in deploying an application to your application servers is to add an app to the stack. The app represents the application, and contains a variety of metadata, such as the application's name and type, and the information required to deploy the application to the server instances, such as the repository URL. You must have Manage permissions to add an app to a stack. For more information, see Managing User Permissions.

The procedure in this section applies to Chef 12 and newer stacks. For information about how to add apps to layers in Chef 11 stacks, see Step 2.4: Create and Deploy an App.

To add an app to a stack

  1. Put the code in your preferred repository—an Amazon S3 archive, a Git repository, a Subversion repository, or an HTTP archive. For more information, see Application Source.

  2. Click Apps in the navigation pane. On the Apps page, click Add an app for your first app. For subsequent apps, click +App.

  3. Use the App New page to configure the app, as described in the following section.

Configuring an App

The Add App page consists of the following sections: Settings, Application source, Data Sources, Environment Variables, Add Domains, and SSL Settings.

Settings

Name

The app name, which is used to represent the app in the UI. AWS OpsWorks Stacks also uses this name to generate a short name for the app that is used internally and to identify the app in the stack configuration and deployment attributes. After you have added the app to the stack, you can see the short name by clicking Apps in the navigation pane and then clicking the app's name to open the details page.

Document root

AWS OpsWorks Stacks assigns the Document root setting to the [:document_root] attribute in the app's deploy attributes. The default value is null. Your deployment recipes can obtain that value from the deploy attributes using standard Chef node syntax and deploy the specified code to the appropriate location on the server. For more information about how to deploy apps, see Deploy Recipes.

Application Source

You can deploy apps from the following repository types: Git, Amazon S3 bundle, HTTP bundle, and Other. All repository types require you to specify the repository type and the repository URL. Individual repository types have their own requirements, as explained below.

Note

AWS OpsWorks Stacks automatically deploys applications from the standard repositories to the built-in server layers. If you use the Other repository type, which is the only option for Windows stacks, AWS OpsWorks Stacks puts the repository information in the app's deploy attributes, but you must implement custom recipes to handle the deployment tasks.

HTTP Archive

To use a publicly-accessible HTTP server as a repository:

  1. Create a compressed archive—zip, gzip, bzip2, Java WAR, or tarball—of the folder that contains the app's code and any associated files.

    Note

    AWS OpsWorks Stacks does not support uncompressed tarballs.

  2. Upload the archive file to the server.

  3. To specify the repository in the console, select HTTP Archive as the repository type and enter the URL.

    If the archive is password-protected, under Application Source, specify the user name and password.

Amazon S3 Archive

To use an Amazon Simple Storage Service bucket as a repository:

  1. Create a public or private Amazon S3 bucket. For more information, see Amazon S3 Documentation.

  2. For AWS OpsWorks Stacks to access private buckets, you must be an IAM user with at least read-only rights to the Amazon S3 bucket and you will need the access key ID and secret access key. For more information, see AWS Identity and Access Management (IAM) Documentation.

  3. Put the code and any associated files in a folder and store the folder in a compressed archive—zip, gzip, bzip2, Java WAR, or tarball.

    Note

    AWS OpsWorks Stacks does not support uncompressed tarballs.

  4. Upload the archive file to the Amazon S3 bucket and record the URL.

  5. To specify the repository in the AWS OpsWorks Stacks console, set Repository type to S3 Archive and enter the archive's URL. For a private archive, you must also provide an AWS access key ID and secret access key whose policy grants permissions to access the bucket. Leave these settings blank for public archives.

Git Repository

A Git repository provides source control and versioning. AWS OpsWorks Stacks supports publicly hosted repository sites such as GitHub or Bitbucket as well as privately hosted Git servers. For both apps and Git submodules, the format you use to specify the repository's URL in Application Source depends on whether the repository is public or private:

Public repository–Use the HTTPS or Git read-only protocols. For example, Getting Started with Chef 11 Linux Stacks uses a public GitHub repository that can be accessed by either of the following URL formats:

  • Git read-only: git://github.com/amazonwebservices/opsworks-demo-php-simple-app.git

  • HTTPS: https://github.com/amazonwebservices/opsworks-demo-php-simple-app.git

Private repository–Use the SSH read/write format shown in these examples:

  • Github repositories: git@github.com:project/repository.

  • Repositories on a Git server: user@server:project/repository

Selecting Git under Source Control displays two additional optional settings:

Repository SSH key

You must specify a deploy SSH key to access private Git repositories. For Git submodules, the specified key must have access to those submodules. For more information, see Using Git Repository SSH Keys.

Important

The deploy SSH key cannot require a password; AWS OpsWorks Stacks has no way to pass it through.

Branch/Revision

If the repository has multiple branches, AWS OpsWorks Stacks downloads the master branch by default. To specify a particular branch, enter the branch name, SHA1 hash, or tag name. To specify a particular commit, enter the full 40-hexdigit commit identifier.

Other Repositories

If the standard repositories do not meet your requirements, you can use other repositories, such as Bazaar. However, AWS OpsWorks Stacks does not automatically deploy apps from such repositories. You must implement custom recipes to handle the deployment process and assign them to the appropriate layers' Deploy events. For an example of how to implement Deploy recipes, see Deploy Recipes.

Data Sources

This section attaches a database to the app. You have the following options:

If you select RDS, you must specify the following.

Database instance

The list includes every Amazon RDS service layer. You can also select one of the following:

(Required) Specify which database server to attach to the app. The contents of the list depend on the data source.

  • RDS – A list of the stack's Amazon RDS service layers.

Database name

(Optional) Specify a database name.

  • Amazon RDS layer – Enter the database name that you specified for the Amazon RDS instance.

    You can get the database name from the Amazon RDS console.

When you deploy an app with an attached database, AWS OpsWorks Stacks adds the database instance's connection to the app's deploy attributes.

You can write a custom recipe to retrieve the information from the deploy attributes and put it file that can be accessed by the application. This is the only option for providing database connection information to the Other application type.

For more information on how to handle database connections, see Connecting to a Database.

To detach a database server from an app, edit the app's configuration to specify a different database server, or no server.

Environment Variables

You can specify a set of environment variables for each app, which are specific to the app. For example, if you have two apps, the environment variables that you define for the first app are not available to the second app and vice versa. You can also define the same environment variable for multiple apps and assign it a different value for each app.

Note

There is no specific limit on the number of environment variables. However, the size of the associated data structure—which includes the variables' names, values, and protected flag values—cannot exceed 10 KB (10240 Bytes). This limit should accommodate most if not all use cases. Exceeding it will cause a service error (console) or exception (API) with the message, "Environment: is too large (maximum is 10KB)."

AWS OpsWorks Stacks stores the variables as attributes in the app's deploy attributes. You can have your custom recipes retrieve those values by using standard Chef node syntax. For examples of how to access an app's environment variables, see Using Environment Variables.

Key

The variable name. It can contain up to 64 upper and lower case letters, numbers, and underscores (_), but it must start with a letter or underscore.

Value

The variable's value. It can contain up to 256 characters, which must all be printable.

Protected value

Whether the value is protected. This setting allows you to conceal sensitive information such as passwords. If you set Protected value for a variable, after you create the app:

  • The app's details page displays only the variable name, not the value.

  • If you have permission to edit the app, you can click Update value to specify a new value, but you cannot see or edit the old value.

Note

By default, the Chef deployment logs do not include environment variables unless deployment fails during a step that used them. In that case, the environment variables are logged as part of the failure's backtrace. To routinely include environment variables in deployment logs, specify an environment variable named SHOW_ENVIRONMENT_VARIABLES. You don't need to specify a value; AWS OpsWorks Stacks checks only for the variable's presence and ignores the value.

For alternative ways to pass data to your application, see Passing Data to Applications and Using an Amazon S3 Bucket.

Domain and SSL Settings

For the Other app type, AWS OpsWorks Stacks adds the settings to the app's deploy attributes. Your recipes can retrieve the data from those attributes and configure the server as needed.

Domain Settings

This section has an optional Add Domains field for specifying domains. For more information, see Using Custom Domains.

SSL Settings

This section has an SSL Support toggle that you can use to enable or disable SSL. If you click Yes, you'll need to provide SSL certificate information. For more information, see Using SSL.

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