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51 lines
1.9 KiB
Markdown
51 lines
1.9 KiB
Markdown
# Basic Two-Tier Architecture in Google Cloud
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This provides a template for running a simple two-tier architecture on Google Cloud.
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The premise is that you have stateless app servers running behind
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a load balancer serving traffic.
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To simplify the example, this intentionally ignores deploying and
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getting your application onto the servers. However, you could do so either via
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[startup script](http://terraform.io/docs/providers/google/r/compute_instance.html#metadata_startup_script) or
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[provisioners](https://www.terraform.io/docs/provisioners/) and a configuration
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management tool, or by pre-baking configured images with
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[Packer](https://packer.io/docs/builders/googlecompute.html).
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You will need to generate SSH keys as follows:
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```sh
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$ ssh-keygen -f ~/.ssh/gcloud_id_rsa
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# press <Enter> when asked (twice) for a pass-phrase
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```
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Then [download your credentials from Google Cloud Console](https://www.terraform.io/docs/providers/google/#credentials); suggested path for downloaded file is `~/.gcloud/Terraform.json`.
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Optionally update `variables.tf` to specify a default value for the `project_name` variable, and check other variables.
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After you run `terraform apply` on this configuration, it will
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automatically output the public IP address of the load balancer.
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After your instance registers, the LB should respond with a simple header:
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```html
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<h1>Welcome to instance 0</h1>
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```
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The index may differ once you increase `count` of `google_compute_instance`
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(i.e. provision more instances).
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To run, configure your Google Cloud provider as described in
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https://www.terraform.io/docs/providers/google/index.html
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Run with a command like this:
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```
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terraform apply \
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-var="region=us-central1" \
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-var="region_zone=us-central1-f" \
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-var="project_name=my-project-id-123" \
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-var="credentials_file_path=~/.gcloud/Terraform.json" \
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-var="public_key_path=~/.ssh/gcloud_id_rsa.pub" \
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-var="private_key_path=~/.ssh/gcloud_id_rsa"
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```
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