# Environment manifest (`env.yaml`) You can include a YAML formatted environment manifest in the root of your application source bundle to configure the environment name, solution stack and [environment links](environment-cfg-links.md) to use when creating your environment. This file format includes support for environment groups. To use groups, specify the environment name in the manifest with a \+ symbol at the end. When you create or update the environment, specify the group name with `--group-name` (AWS CLI) or `--env-group-suffix` (EB CLI). For more information on groups, see [Creating and updating groups of Elastic Beanstalk environments](environment-mgmt-compose.md). The following example manifest defines a web server environment with a link to a worker environment component that it is dependent upon. The manifest uses groups to allow creating multiple environments with the same source bundle: **`~/myapp/frontend/env.yaml`** ``` AWSConfigurationTemplateVersion: 1.1.0.0 SolutionStack: 64bit Amazon Linux 2015.09 v2.0.6 running Multi-container Docker 1.7.1 (Generic) OptionSettings: aws:elasticbeanstalk:command: BatchSize: '30' BatchSizeType: Percentage aws:elasticbeanstalk:sns:topics: Notification Endpoint: me@example.com aws:elb:policies: ConnectionDrainingEnabled: true ConnectionDrainingTimeout: '20' aws:elb:loadbalancer: CrossZone: true aws:elasticbeanstalk:environment: ServiceRole: aws-elasticbeanstalk-service-role aws:elasticbeanstalk:application: Application Healthcheck URL: / aws:elasticbeanstalk:healthreporting:system: SystemType: enhanced aws:autoscaling:launchconfiguration: IamInstanceProfile: aws-elasticbeanstalk-ec2-role InstanceType: t2.micro EC2KeyName: workstation-uswest2 aws:autoscaling:updatepolicy:rollingupdate: RollingUpdateType: Health RollingUpdateEnabled: true Tags: Cost Center: WebApp Dev CName: front-A08G28LG+ EnvironmentName: front+ EnvironmentLinks: "WORKERQUEUE" : "worker+" ``` The following keys are supported. + **AWSConfigurationTemplateVersion** (required) – The configuration template version (1.1.0.0). ``` AWSConfigurationTemplateVersion: 1.1.0.0 ``` + **Platform** – The Amazon Resource Name (ARN) of the environment's platform version. You can specify the platform by ARN or solution stack name. ``` Platform: PlatformArn: {{arn:aws:elasticbeanstalk:us-east-2::platform/Java 8 running on 64bit Amazon Linux/2.5.0}} ``` + **SolutionStack** – The full name of the [solution stack](concepts.platforms.md) used to create the environment. ``` SolutionStack: {{64bit Amazon Linux 2017.03 v2.5.0 running Java 8}} ``` + **OptionSettings** – [Configuration option](command-options.md) settings to apply to the environment. For example, the following entry sets the instance type to t2.micro. ``` OptionSettings: aws:autoscaling:launchconfiguration: InstanceType: t2.micro ``` + **Tags** – Up to 47 tags to apply to resources created within the environment. ``` Tags: Cost Center: WebApp Dev ``` + **EnvironmentTier** – The type of environment to create. For a web server environment, you can exclude this section (web server is the default). For a worker environment, use the following. ``` EnvironmentTier: Name: Worker Type: SQS/HTTP ``` + **CName** – The CNAME for the environment. Include a \+ character at the end of the name to enable groups. ``` CName: {{front-A08G28LG}}+ ``` + **EnvironmentName** – The name of the environment to create. Include a \+ character at the end of the name to enable groups. ``` EnvironmentName: {{front}}+ ``` With groups enabled, you must specify a group name when you create the environments. Elastic Beanstalk appends the group name to the environment name with a hyphen. For example, with the environment name `front+` and the group name `dev`, Elastic Beanstalk will create the environment with the name `front-dev`. + **EnvironmentLinks** – A map of variable names and environment names of dependencies. The following example makes the `worker+` environment a dependency and tells Elastic Beanstalk to save the link information to a variable named `WORKERQUEUE`. ``` EnvironmentLinks: "{{WORKERQUEUE}}" : "{{worker}}+" ``` The value of the link variable varies depending on the type of the linked environment. For a web server environment, the link is the environment's CNAME. For a worker environment, the link is the name of the environment's Amazon Simple Queue Service (Amazon SQS) queue. The **CName**, **EnvironmentName** and **EnvironmentLinks** keys can be used to create [environment groups](environment-mgmt-compose.md) and [links to other environments](environment-cfg-links.md). These features are currently supported when using the EB CLI, AWS CLI or an SDK.

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