Provisoner Block
Provisioners allow us to specify actions to be performed on local or remote machines to prepare resources for service. Provisioners allow us to perform tasks such as installing the desired software, configuring the resource, running scripts, or executing commands on the resource.
Provisioners can be defined within a resource block and are executed in a specific order depending on the type of provisioner.
- There are two types of Terraform provisioners:
local-exec
andremote-exec
. local-exec
invokes local executables after a resource is created. It runs the process on the machine running Terraform, meaning the machine where you runterraform apply
. This is most likely your own computer.remote-exec
invokes a remote executable, something like an EC2 instance on AWS.
Example:
resource "aws_instance" "web_server" {
provisioner "local-exec" {
command = "Get-Date > completed.txt"
interpreter = ["PowerShell", "-Command"]
}
provisioner "remote-exec" {
inline = [
"chmod +x /tmp/script.sh",
"/tmp/script.sh args",
]}}
allows
By implementing these block types effectively, we can achieve effective infrastructure management with Terraform. Using the right blocks in the right places allows you to define your desired infrastructure state, provision resources, retrieve data and communicate important information. This modular and declarative approach simplifies the management of infrastructure, facilitates code reuse, promotes consistency, and enhances collaboration among teams working on infrastructure projects.
These are some of the common Terraform blocks and their use cases. It’s important to note that not all blocks are required in every Terraform configuration. The specific blocks you use will depend on the infrastructure you are managing and the requirements of your project.
Different Types of Blocks in Terraform
Terraform is an infrastructure as a code tool that allows you to define and configure your infrastructure using your declarative code. Its syntax is very simple. Terraform uses a configuration language to describe the desired state of your infrastructure, and this language is composed of various block types. These block types play a crucial role in defining and configuring infrastructure in Terraform.
In Terraform, a block is a fundamental unit used to define and configure different aspects of your infrastructure. Blocks are written in HashiCorp Configuration Language (HCL) and allow you to declare resources, providers, variables, outputs, and other configuration elements within your Terraform code.
Each block serves a specific purpose and has its own syntax and set of properties. Here are some common block types used in Terraform:
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