terraform-aws-dynamic-ami-id.tf

main.tf

data "aws_ami" "linux_ami" {
    most_recent = true
    owners = ["${element(split(";", var.ami_id_filter[var.linux_distro]), 1)}"]

    filter {
        name   = "name"
        values = ["${element(split(";", var.ami_id_filter[var.linux_distro]), 0)}"]
    }

    filter {
        name   = "virtualization-type"
        values = ["hvm"]
    }

    filter {
        name   = "architecture"
        values = ["x86_64"]
    }
}


resource "aws_instance" "master" {
    ami           = "${data.aws_ami.linux_ami.id}"
    instance_type = "t2.micro"
    key_name      = "test"

    tags {
        Name        = "test"
    }

    lifecycle {
        ignore_changes = ["user_data"]
    }
}

variables.tf

variable "linux_distro" {
    type = "string"
    default = "ubuntu16"
}

variable "ami_id_filter" {
    type = "map"

    default = {
        "ubuntu19" = "ubuntu/images/hvm-ssd/ubuntu-*-19.04-amd64-server-*;099720109477"
        "ubuntu18" = "ubuntu/images/hvm-ssd/ubuntu-*-18.04-amd64-server-*;099720109477"
        "ubuntu16" = "ubuntu/images/hvm-ssd/ubuntu-*-16.04-amd64-server-*;099720109477"
        "ubuntu14" = "ubuntu/images/hvm-ssd/ubuntu-*-14.04-amd64-server-*;099720109477"
        "debian9"  = "debian-stretch-*;379101102735"
        "debian8"  = "debian-jessie-*;379101102735"
        "centos7"  = "CentOS Linux 7*;679593333241"
        "centos6"  = "CentOS Linux 6*;679593333241"
        "rhel8"    = "RHEL-8.?*;309956199498"
        "rhel7"    = "RHEL-7.?*GA*;309956199498"
        "rhel6"    = "RHEL-6.?*GA*;309956199498"
    }
}