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How to Setup Google Workload Identity Federation for Github Actions Runners
When using GHA(Github Actions) for CI/CD purposes, the Github-hosted runners are free unless you use it quite a lot. But if I want to use GHA to build a docker container image and save it to my private repository in Google Artifact Registry, I have to grant the permission to some VMs I don’t even…
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Solved: Error 403: The caller does not have permission
Recently I got a very confusing error when setting up a PubSub subscription to write to a Big Query table via terraform. Here’s the partial terraform code snippet: And the input variable subscriptions looks like: It doesn’t show any error when doing terraform plan however it gives 403 error when applying. After some googling I…
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How to Avoid Rebuild Resources with Terraform/Terragrunt
I use Terraform and Terragrunt a lot at work to keep track of infrastructure changes. Sometimes I refactored code in modules so there’s no change to infrastructure but since the module changed terraform will insist to rebuild affected resources. It’s not quite comfortable to destroy some resources and then just create exactly the same ones.…
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Terraform: String Manipulation for Default Domains
Imaging when I needed to grant access to a Google storage bucket for a list of Google service accounts, I put the list in YAML like this: Assuming horizon is the default GCP project and mass-effect is a partner project and most GSAs are of course from the default project. So can this list be…
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Sample Terraform Code to Manage Temporary Access to GCP
TL; DR: This is a way to grant a temporary access to some GCP resources using Terraform’s time_static and google_project_iam_member resources. 🙂
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How to Use YAML as Data Source in Terraform
I love how DRY and lean YAML can be, since I started to learn Ansible years ago. Recently I wanted to provision MySQL user privileges right after the database instance provisioned in Google Cloud SQL. I used petoju/mysql Terraform provider to get the job done, it’s a community provider but seemed to be quite popular.…
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Passing Environment Variables to Terraform with RegExp
In a Terraform template, an input variable can be used to set some configuration point for a resource, such as In some scenario the input variable can get its value from an environment variable in the shell where terraform runs. It looks like This is handy where there is just a few variables. If there…
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Update GCP IAM Adaptively with Terraform DataSources
In a scenario where a service account in a central GCP project needs to be accessible by a group of GKE service accounts across multiple GCP projects, the IAM part in Terraform HCL could look like I can make a variable for the members so it becomes But still the project_ids variable needs to be…