Use Infrastructure as Code to provision and manage any cloud, infrastructure, or service
Learning
Best video for learn terraform: Terraform Course - Automate your AWS cloud infrastructure https://www.youtube.com/watch?v=SLB_c_ayRMo
Documents
https://www.terraform.io/ offical docs
https://www.alibabacloud.com/help/zh/doc-detail/91285.htm?spm=a2c63.p38356.b99.372.8b994d00YwQjZI 中文版,阿里云文档
https://learn.hashicorp.com/terraform/getting-started/intro Get Started - AWS
Why not use ansible ? because changes to resources aren’t tracked.
Why didn’t we choose CloudFormation? Its support is limited to AWS.
Terraform config is code we write, state file is a json file. store these on the remote.
Plan is safe to do any where, apply we don’t comment any want. don’t apply locally, don’t apply locally, don’t apply locally!
| Commands | Description |
|---|---|
| terraform init | Initiate Terraform. Terraform must be initiated before you plan/apply terraform. |
| terraform plan | You will be able to examine Terraform’s execution plan before you deploy it to AWS. |
| terraform apply | Deploy your final execution plan to AWS. |
| terraform init -upgrade | Update providers. |
| terraform state show | Inspect the current state. |
| terraform graph | Displays the visual dependency graph of Terraform resources according to configuration files in DIR (or the current directory if omitted). |
| terraform destroy | Destroy all resources created by terraform and also destroy the changes in your state file. |
| terraform plan-out |
To save the displayed plan (from the ‘terraform plan’ command) for reference. |
precedence 优先级
https://www.terraform.io/docs/configuration/variables.html#variable-definition-precedence
Local Values
https://www.terraform.io/docs/configuration/locals.html
terraenv
This is a good multi-version control tools for terraform. https://github.com/aaratn/terraenv