[![npm version](https://badge.fury.io/js/serverless-plugin-canary-deployments.svg)](https://badge.fury.io/js/serverless-plugin-canary-deployments) # Serverless Plugin Canary Deployments A Serverless plugin to implement canary deployments of Lambda functions, making use of the [traffic shifting feature](https://docs.aws.amazon.com/lambda/latest/dg/lambda-traffic-shifting-using-aliases.html) in combination with [AWS CodeDeploy](https://docs.aws.amazon.com/lambda/latest/dg/automating-updates-to-serverless-apps.html) ## Contents - [Installation](#installation) - [Usage](#usage) - [Configuration](#configuration) - [How it works](#how) - [Limitations](#limitations) - [License](#license) ## Installation `npm i --save-dev serverless-plugin-canary-deployments` ## Usage To enable gradual deployments for Lambda functions, your `serverless.yml` should look like this: ```yaml service: canary-deployments provider: name: aws runtime: nodejs6.10 iamRoleStatements: - Effect: Allow Action: - codedeploy:* Resource: - "*" plugins: - serverless-plugin-canary-deployments functions: hello: handler: handler.hello events: - http: GET hello deploymentSettings: type: Linear10PercentEvery1Minute alias: Live preTrafficHook: preHook postTrafficHook: postHook alarms: - FooAlarm # When a string is provided, it expects the alarm Logical ID - name: BarAlarm # When an object is provided, it expects the alarm name in the name property preHook: handler: hooks.pre postHook: handler: hooks.post ``` You can see a working example in the [example folder](./example/). ## Configuration * `type`: (required) defines how the traffic will be shifted between Lambda function versions. It must be one of the following: - `Canary10Percent5Minutes`: shifts 10 percent of traffic in the first increment. The remaining 90 percent is deployed five minutes later. - `Canary10Percent10Minutes`: shifts 10 percent of traffic in the first increment. The remaining 90 percent is deployed 10 minutes later. - `Canary10Percent15Minutes`: shifts 10 percent of traffic in the first increment. The remaining 90 percent is deployed 15 minutes later. - `Canary10Percent30Minutes`: shifts 10 percent of traffic in the first increment. The remaining 90 percent is deployed 30 minutes later. - `Linear10PercentEvery1Minute`: shifts 10 percent of traffic every minute until all traffic is shifted. - `Linear10PercentEvery2Minutes`: shifts 10 percent of traffic every two minutes until all traffic is shifted. - `Linear10PercentEvery3Minutes`: shifts 10 percent of traffic every three minutes until all traffic is shifted. - `Linear10PercentEvery10Minutes`: shifts 10 percent of traffic every 10 minutes until all traffic is shifted. - `AllAtOnce`: shifts all the traffic to the new version, useful when you only need to execute the validation hooks. * `alias`: (required) name that will be used to create the Lambda function alias. * `preTrafficHook`: (optional) validation Lambda function that runs before traffic shifting. It must use the CodeDeploy SDK to notify about this step's success or failure (more info [here](https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html)). * `postTrafficHook`: (optional) validation Lambda function that runs after traffic shifting. It must use the CodeDeploy SDK to notify about this step's success or failure (more info [here](https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html)) * `alarms`: (optional) list of CloudWatch alarms. If any of them is triggered during the deployment, the associated Lambda function will automatically roll back to the previous version. * `triggerConfigurations`: (optional) list of CodeDeploy Triggers. See more details in the [CodeDeploy TriggerConfiguration Documentation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-codedeploy-deploymentgroup-triggerconfig.html), or [this CodeDeploy notifications guide](https://docs.aws.amazon.com/codedeploy/latest/userguide/monitoring-sns-event-notifications-create-trigger.html) for example uses ### Default configurations You can set default values for all functions in a top-level custom deploymentSettings section. E.g.: ```yaml custom: deploymentSettings: codeDeployRole: some_arn_value codeDeployRolePermissionsBoundary: some_arn_value stages: - dev - prod functions: ... ``` Some values are only available as top-level configurations. They are: * `codeDeployRole`: (optional) an ARN specifying an existing IAM role for CodeDeploy. If absent, one will be created for you. See the [codeDeploy policy](./example-code-deploy-policy.json) for an example of what is needed. * `codeDeployRolePermissionsBoundary`: (optional) an ARN specifying an existing IAM permissions boundary, this permission boundary is set on the code deploy that is being created when codeDeployRole is not defined. * `stages`: (optional) list of stages where you want to deploy your functions gradually. If not present, it assumes that are all of them. ## How it works The plugin relies on the [AWS Lambda traffic shifting feature](https://docs.aws.amazon.com/lambda/latest/dg/lambda-traffic-shifting-using-aliases.html) to balance traffic between versions and [AWS CodeDeploy](https://docs.aws.amazon.com/lambda/latest/dg/automating-updates-to-serverless-apps.html) to automatically update its weight. It modifies the `CloudFormation` template generated by [Serverless](https://github.com/serverless/serverless), so that: 1. It creates a Lambda function Alias for each function with deployment settings. 2. It creates a CodeDeploy Application and adds a [CodeDeploy DeploymentGroup](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-codedeploy-deploymentgroup.html) per Lambda function, according to the specified settings. 3. It modifies events that trigger Lambda functions, so that they invoke the newly created alias. ## Limitations For now, the plugin only works with Lambda functions invoked by * API Gateway * Stream based (such as the triggered by Kinesis, DynamoDB Streams or SQS) * SNS based events * S3 events * CloudWatch Scheduled events * CloudWatch Logs * IoT rules * AppSync DataSources [More events](https://serverless.com/framework/docs/providers/aws/events/) will be added soon. ## License ISC © [David García](https://github.com/davidgf)

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