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wavefront-serverless-rollback-plugin

Serverless plugin for doing a Lambda rollback when wavefront alert triggered

How it works

The plugin hooks into serverless' deploy command. When the deploy command is invoked, this what will happen:

• It downloads your service's previous CloudFormation template to be used as rollback target
• It uploads a rollback Lambda and sets up its REST API Gateway
• It creates a Wavefront webhook and alert to call the Lambda
• When the alert is triggered, it calls the Lambda and the Lambda executes the rollback using the previous version's CloudFormation template
• After rolling back, the Lambda deletes its REST API Gateway, the Wavefront alert, and itself

New service setup

This is how to add the plugin to your service project.

From NPM

• Switch to your own serverless service project directory
• Run npm install -g wavefront-serverless-rollback-plugin to install plugin
• Add wavefront-serverless-rollback-plugin to plugin list in your serverless.yml
• Run serverless deploy to deploy your service with the rollback function

From Cloned Plugin Repo

Assuming you've cloned the plugin repo to [path/to/plugin/dir].

• Switch to your own serverless service project directory
• Run npm install -g [path/to/plugin/dir] to install plugin
• Add wavefront-serverless-rollback-plugin to plugin list in your serverless.yml
• Run serverless deploy to deploy your service with the rollback function

Serverless YAML options

See serverless.yml for custom option samples. Use custom options to modify the plugin's settings.

• wavefrontDebugMode: Optional, to use /rollback API path if in debug mode
• wavefrontForceDeploy: Optional, to force replace of existing rollback function
• wavefrontApiKey: Required, for calling the Wavefront API
• wavefrontApiInstanceUrl: Required, your wavefront instance URL for calling the Wavefront API
• wavefrontRollbackAlertTriggerThreshold: Optional, set how long the alert condition should be true before triggering an alert, min 2
• wavefrontRollbackAlertCondition: Required, set Wavefront alert condition with a ts query, example: watching for any Lambda error for the last 5 minutes: 'any(5m, ts(aws.lambda.errors, source="<function_name>"))', replace <function_name> with your service's function name
• wavefrontAlertAdditionalTarget: Optional, add list of email address or any custom Wavefront alert target here

Customizing the rollback Lambda

Inside [path/to/plugin/dir]/src-wavefront-serverless-rollback-plugin directory you can find the default rollback Lambda, rollback.js. It will be called by the Wavefront alert.

To use additional npm packages in the rollback function, specify your dependencies both in [path/to/plugin/dir]/package.json and [path/to/plugin/dir]/src-wavefront-serverless-rollback-plugin/rollbackPackage.json, the plugin will automatically include them when deploying the function to Lambda.

If you modified the function in the cloned repo, you will need to run npm install -g [path/to/plugin/dir] again.

Customizing the plugin

In the [path/to/plugin/dir] you can find index.js file where you can customize the plugin's main functions.

If you modified the plugin in the cloned repo, you will need to run npm install -g [path/to/plugin/dir] again.

Building

• Switch to cloned directory
• Run npm install to install needed npm packages
• Run serverless to check if setup success