[modules/aws-ec2-docker-ucp-workers/main.tf] cnunez | i ran into a se…

…lf-referencing splat error that preventing me from using the same approach taht I did with the (single-node) managers. using a null resource with triggers proports to solve this. See: hashicorp/terraform#2677

docker-ddc-terraform/modules/aws-ec2-docker-ucp-workers/main.tf

@@ -166,6 +166,25 @@ EOF
     delete_on_termination = true
   }
 }
+resource "null_resource" "provision_ucp_worker_a" {
+  triggers {
+    ucp_worker_changes = "${join(",", aws_instance.ucp_worker_a.*.id)}"
+  }
+  count = "${var.number_of_aws_availability_zones_to_use > 1 ? var.number_of_workers_per_az : 0}"
+  provisioner "local-exec" {
+    command = <<EOF
+ANSIBLE_HOST_KEY_CHECKING=false ansible-playbook \
+  -u ubuntu \
+  --private-key ${var.aws_ec2_private_key_location} \
+  -i ${element(aws_instance.ucp_worker_a.*.public_ip,count.index)}, \
+  -e docker_ee_repo_url=${var.docker_ee_repo_url} \
+  -e ucp_role=worker \
+  -e is_primary_node=false \
+  -e docker_ucp_swarm_leader=${var.docker_swarm_leader_ip} \
+  docker-ucp-playbook.yml
+EOF
+  }
+}
 
 resource "aws_route53_record" "ucp_worker_b" {
   depends_on = [
@@ -179,24 +198,31 @@ resource "aws_route53_record" "ucp_worker_b" {
   records = [ "${element(aws_instance.ucp_worker_b.*.public_dns, count.index)}" ]
 }
 
-resource "aws_instance" "ucp_worker_c" {
-  depends_on = [
-    "aws_security_group.ucp_worker",
-    "aws_subnet.worker_subnet_c"
-  ]
+resource "null_resource" "provision_ucp_worker_b" {
+  triggers {
+    ucp_worker_changes = "${join(",", aws_instance.ucp_worker_b.*.id)}"
+  }
+  count = "${var.number_of_aws_availability_zones_to_use > 1 ? var.number_of_workers_per_az : 0}"
   provisioner "local-exec" {
     command = <<EOF
 ANSIBLE_HOST_KEY_CHECKING=false ansible-playbook \
   -u ubuntu \
   --private-key ${var.aws_ec2_private_key_location} \
-  -i ${element(aws_instance.ucp_worker_c.*.public_ip,count.index)}, \
+  -i ${element(aws_instance.ucp_worker_b.*.public_ip,count.index)}, \
   -e docker_ee_repo_url=${var.docker_ee_repo_url} \
   -e ucp_role=worker \
   -e is_primary_node=false \
   -e docker_ucp_swarm_leader=${var.docker_swarm_leader_ip} \
   docker-ucp-playbook.yml
 EOF
   }
+}
+
+resource "aws_instance" "ucp_worker_c" {
+  depends_on = [
+    "aws_security_group.ucp_worker",
+    "aws_subnet.worker_subnet_c"
+  ]
   associate_public_ip_address = true
   subnet_id = "${aws_subnet.worker_subnet_c.id}"
   count = "${var.number_of_aws_availability_zones_to_use > 2 ? var.number_of_workers_per_az : 0}"
@@ -218,6 +244,26 @@ EOF
   }
 }
 
+resource "null_resource" "provision_ucp_worker_c" {
+  triggers {
+    ucp_worker_changes = "${join(",", aws_instance.ucp_worker_c.*.id)}"
+  }
+  count = "${var.number_of_aws_availability_zones_to_use > 2 ? var.number_of_workers_per_az : 0}"
+  provisioner "local-exec" {
+    command = <<EOF
+ANSIBLE_HOST_KEY_CHECKING=false ansible-playbook \
+  -u ubuntu \
+  --private-key ${var.aws_ec2_private_key_location} \
+  -i ${element(aws_instance.ucp_worker_c.*.public_ip,count.index)}, \
+  -e docker_ee_repo_url=${var.docker_ee_repo_url} \
+  -e ucp_role=worker \
+  -e is_primary_node=false \
+  -e docker_ucp_swarm_leader=${var.docker_swarm_leader_ip} \
+  docker-ucp-playbook.yml
+EOF
+  }
+}
+
 resource "aws_route53_record" "ucp_worker_c" {
   depends_on = [
     "aws_instance.ucp_worker_c"