Terraform Provisioning
- Provisioning in Terraform is majorly used to do Configuration Management
- Terraform supports many provisioners, some of them are
- remote-exec
- local-exec
- Chef
- For Ansible based CM use remote-exec to install ansible and execute ansible-playbook with localhost in inventory
- To use provisioners, you should also use connection
- Provisioners are written in terraform resources
resource '<resource-type>' '<resource-name>' {
connection {
...
}
provisioner 'p-type' {
}
}
- Lets create a ec2 machine and install git & apache
- First create ec2 machine
resource "aws_instance" "apache" {
ami = "ami-04590e7389a6e577c"
instance_type = "t2.micro"
key_name = "packer"
security_groups = ["sshonly"]
}
- Now lets add the connection section for terraform to connect to ec2 machine
resource "aws_instance" "apache" {
ami = "ami-04590e7389a6e577c"
instance_type = "t2.micro"
key_name = "packer"
security_groups = ["sshonly"]
connection {
type = "ssh"
user = "ec2-user"
host = "${aws_instance.apache.public_ip}"
private_key = "${file("./packer.pem")}"
}
}
- Now lets provision using remote-exec to install git & apache
resource "aws_instance" "apache" {
ami = "ami-04590e7389a6e577c"
instance_type = "t2.micro"
key_name = "packer"
security_groups = ["sshonly"]
connection {
type = "ssh"
user = "ec2-user"
host = "${aws_instance.apache.public_ip}"
private_key = "${file("./packer.pem")}"
}
provisioner "remote-exec" {
inline = ["sudo yum install git -y", "sudo yum install httpd -y"]
}
}
Backends
-
To use Azurerm Backend refer here
-
To use Aws Backend Refer Here
Exercise
- Write a terraform template to create two vms (ec2 or azure vms) and install tomcat in one vm and mongo db (any database) in other vm
