Terraform Tutorial
Terraform User_Data
user_data
The user_data only runs at instance launch time.
Here is a sample of using user_data embedded into tf file:
resource "aws_instance" "user_data_example" {
ami = lookup(var.ami_id, var.region)
instance_type = var.instance_type
# subnet_id = aws_subnet.public_1.id
# Security group assign to instance
vpc_security_group_ids = [aws_security_group.allow_ssh.id]
# key name
key_name = var.key_name
user_data = <<EOF
#! /bin/bash
sudo yum update -y
sudo yum install -y httpd.x86_64
sudo service httpd start
sudo service httpd enable
echo "<h1>Welcome to Httpd Server</h1>" |
sudo tee /var/www/html/index.html
EOF
tags = {
Name = "Ec2-User-data"
}
}
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But we prefer to use a file() function:
resource "aws_instance" "user_data_example_input_file" {
ami = lookup(var.ami_id, var.region)
instance_type = var.instance_type
# subnet_id = aws_subnet.public_1.id
# Security group assign to instance
vpc_security_group_ids = [aws_security_group.allow_ssh.id]
# key name
key_name = var.key_name
user_data = "${file("apache_config.sh")}"
tags = {
Name = "Ec2-User-data-with-file"
}
}
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The apache_config.sh looks like this:
#! /bin/bash
sudo yum update -y
sudo yum install -y httpd.x86_64
sudo yum service httpd start
sudo yum service httpd enable
echo "<h1>Welcome to Httpd Server</h1>" | yum tee
/var/www/html/index.html
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Run Terraform Apply and see the Public IP in browser to see the above message
