Amazon Web Services (AWS) is a set of cloud services that help you manage your web applications, servers, databases and more. AWS Lambda is a compute service to which you can upload your code, and then the service can run the code on your behalf using AWS infrastructure.
Semaphore has a built-in integration which makes continuous deployment to AWS Lambda very easy. This guide shows you how you can set it up and assumes that you already have an application that is configured on AWS Lambda.
To get started, click on Set Up Deployment on your project page on Semaphore.
There are two deployment strategies on Semaphore: "automatic" and "manual".
Automatic means that a deploy will be triggered after every passed build on the selected branch. In addition, you can also manually deploy any build from any branch at any time.
The Manual strategy requires the manual selection of the builds to deploy.
For automatic deployment, you will be asked to select which branch will be automatically deployed after each passed build.
Note: You can easily change the deployment strategy from server settings at any time once the setup is complete.
In this step, you need to choose from which branch you wish to deploy your application.
On the following screen, enter your AWS credentials. If you need help getting these credentials, consult the "Retrieving Security Credentials" section of Semaphore's tutorial on deploying a web application on Elastic Beanstalk. The process for retrieving credentials is the same when deploying to Lambda.
After entering the credentials, select the region your application resides in on the same screen. This will enable Semaphore to list the functions in the region you specified.
Next, you can choose the Lambda function to which you wish to deploy your code. Also, there are suggested commands for installing dependencies in your project. This is needed because Lambda needs all the source files of the packages you use in your project.
In this step, you need to provide a name for your server, which can be any name of your choice. It will be used on your Semaphore dashboard and deployment timeline. During this step, you may also choose to set a server URL for quick access on Semaphore.
The setup is now complete - you are ready to automatically deploy to Lambda. All you need to do is click on Deploy.
You can view which environment variables are exported during deploy to Lambda, together with some common AWS environment variables.
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