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86 lines
1.6 KiB
Markdown
86 lines
1.6 KiB
Markdown
---
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title: "Shared Packer & Terraform Config"
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date: 2020-05-08T22:59:30-04:00
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draft: false
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tags: ["Deployment"]
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medium_enabled: true
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---
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You might have noticed from my last two posts on [Packer](/blog/snapshotswithpacker/) and [Terraform](/blog/autodeployterraform/) that the configuration files are highly similar. In fact, we can trick them into sharing a configuration file!
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## Shared Configuration
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First let's create a file we'll call `config` that contains all our assignments. Here is an example configuration:
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```
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base_system_image = "ubuntu-20-04-x64"
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region = "nyc3"
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size = "512mb"
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domain = "example.com"
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subdomain = "temp"
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# Secrets
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do_token = "DO-TOKEN-HERE"
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key_name = "KEY-NAME-ON-DO"
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```
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Then we'll create a file named `variables.hcl` that contains the type definitions
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```
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variable "do_token" {
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type = string
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}
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variable "base_system_image" {
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type = string
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}
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variable "domain" {
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type = string
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}
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variable "key_name" {
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type = string
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}
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variable "subdomain" {
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type = string
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}
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variable "region" {
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type = string
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}
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variable "size" {
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type = string
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}
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```
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## Packer
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Now to trick Packer into reading the configuration files we need to:
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- map `variables.auto.pkrvars.hcl` to `config`
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- map `variables.pkr.hcl` to `variables.hcl`
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We can do this with symbolic links
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```bash
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ln -s config variables.auto.pkrvars.hcl
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ln -s variables.hcl variables.pkr.hcl
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```
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## Terraform
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To trick Terraform into reading the configuration files we need to:
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- map `terraform.tfvars ` to `config`
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- map `variables.tf` to `variables.hcl`
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As before, we can do this with symbolic links
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```bash
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ln -s config terraform.tfvars
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ln -s variables.hcl variables.tf
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```
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