Nowadays, CI/CD is a common task during Software Development and almost all platforms enable us to do this automatically. It is not different on Gitlab.
Today I'll gonna show you how to configure your Gitlab project to automatically deploy on Google Cloud App Engine.
First, you need to setup your App Engine project on GCP console. It is necessary because App Engine requires you to set the region of your app.
If you didn't do this, first you will need to setup using this cmd:
and follow the instructions.
The entire process should be made without human intervention. So, to do this on GCP you'll need a Service Account.
First, create a Service Account to be used during the process: Service Account Create
Step2: Very important step, here you MUST give all those permissions. Without them the automation will not work properly.
In the last step you should open the file and copy the content. This content will be necessy to configure the Gitlab.
Some APIs must be enabled before trying to run the deploy.
Enable the App Engine Admin API, here:
Enable App Engine Admin API
Enable Cloud Builder API: Cloud Builder API Enable
Now you have all done on GCP, Gitlab part!
Go to your project and configure the CI/CD options:
Instead of having the content of your Service Account in a file inside your repository, is a best practice to have this as variable. So, configure a variable, following the image:
To enable all these pieces together is required to "tell" to Gitlab: "Please my friend, run all these now". To do this you should create a file in your repository called .gitlab-ci.yml, this file describes what you want to do.
File content available here.
The CI process runs inside the container platform in Gitlab. At the glance, it seems like a Dockerfile, as you should define and base image where your deploy will runs.
In this case, I'm using Google's base image that contains the Google Cloud SDK already installed.
To understand more about all configs available on Gitlab CI, take a look here.
This post aims to help you to deploy an app to App Engine Standard. As my example is a Golang app in the 2nd gen runtime, it is a bit easier. To deploy a Java 8 app is a little bit different. If you want any help to setup your Java 8 app, ask me in the comments, I also have an example for this scenario.
I hope it helps you, people!
See you soon.
You can find this project in my Gitlab project.