The chef, file, local-exec, puppet, remote-exec, provisioner invokes a script on a remote resource only after it is created. Thus, if you add provisioner code after “terraform apply”, it would not considers as a changes and terraform would flag no resources addition and change.

Thus, How to apply a provisioners changes in resources created. There are 2 method to apply provisioners even after “terraform apply”.

Adding provisioner sections to an existing (already provisioned) aws_instance is not something that terraform notices as a ‘change’, so the provisioner is not run during the next apply. The only way to run the provisioner is to destroy the instance and let terraform create it again.

Method 1 – Destroy and Recreate

Adding provisioner sections to an existing (already provisioned) aws_instance is not something that terraform notices as a ‘change’, so the provisioner is not run during the next apply. The only way to run the provisioner is to destroy the instance and let terraform create it again.

Method 2 – Using null_resource

The solution is to create a resource “null_resource” “nameYouWant” { } and then run your commands inside that. They will run after the initial resources are created:

	resource "aws_instance" "consul" {
	count = 3
	ami = "ami-ce5a9fa3"
	instance_type = "t2.micro"
	key_name = "ansible_aws"
	tags {
	Name = "consul"
	}
	}
	resource "null_resource" "configure-consul-ips" {
	count = 3
	connection {
	user = "ubuntu"
	private_key="${file("/home/ubuntu/.ssh/id_rsa")}"
	agent = true
	timeout = "3m"
	}
	provisioner "remote-exec" {
	inline = [
	"sudo apt-get update",
	"sudo apt-get install -y curl",
	"sudo echo '${join("\n", aws_instance.consul.*.private_ip)}' > /home/ubuntu/test.txt"
	]
	}
	}

view raw terraform-provisonar1.tf hosted with by GitHub

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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