EC2: Implement automatic detection of the AMI used for instance provi…

…sioning.

DevOpsVPC/infrastructure.conf

@@ -27,31 +27,7 @@ vpc_public_subnets    = ["10.10.10.0/24"]
 
 
 #-- EC2
-ec2_ami = "ami-6d1c2007"
-# TODO - search for AMI
-#data "aws_ami" "jenkins" {
-#    most_recent   = true
-#    owners        = ["self"]
-#    filter {
-#        name    = "tag:OS_Version"
-#        values  = ["Fedora"]
-#    }
-#    filter {
-#        name    = "tag:Release"
-#        values  = ["25"]
-#    }
-#    filter {
-#        name    = "architecture"
-#        values  = ["x86_64"]
-#    }
-#    filter {
-#        name    = "virtualization-type"
-#        values  = ["hvm"]
-#    }
-#    filter {
-#        name    = "name"
-#        values  = ["Docker*"]
-#    }
-#}
+#-- ami determined automatically
+ec2_os = "CentOS Linux 7 x86_64"
 ssh_public_key_name   = "terraform-ssh-key"
 ssh_public_key_file   = "~/.ssh/id_rsa.pub"

DevOpsVPC/variables.tf

@@ -60,8 +60,8 @@ variable "ssh_public_key_file" {
 }
 
 #-- EC2
-variable "ec2_ami" {
-  description = "Name of the AMI image used for EC2 creation"
+variable "ec2_os" {
+  description = "OS version that will be used to find AMI image for EC2 creation"
   type = "string"
 }
 
@@ -75,6 +75,32 @@ variable "default_tags" {
   }
 }
 
+#-- Determine latest CentOS AMI by our search criteria
+data "aws_ami" "centos" {
+  most_recent   = true
+  owners = ["679593333241"] # CentOS
+  filter {
+    name   = "owner-alias"
+    values = ["aws-marketplace"]
+  }
+  filter {
+    name    = "name"
+    values  = ["${var.ec2_os}*"]
+  }
+  filter {
+    name    = "state"
+    values  = ["available"]
+  }
+  filter {
+    name    = "architecture"
+    values  = ["x86_64"]
+  }
+  filter {
+    name    = "virtualization-type"
+    values  = ["hvm"]
+  }
+}
+
 # TODO for future
 #...