AWS deploy: add big (hence fast) EBS volume to QED servers

deploy/aws/modules/qed/main.tf

@@ -42,6 +42,13 @@ resource "aws_instance" "qed-server" {
     volume_size = "${var.volume_size}"
   }]
 
+  ebs_block_device = {
+    device_name           = "/dev/xvdc"
+    volume_type           = "gp2"
+    volume_size           = "${var.ebs_volume_size}"
+    delete_on_termination = "true"
+  }
+
   tags {
     Name = "${format("${var.name}-%01d", count.index)}"
     Role = "${var.role}"

deploy/aws/modules/qed/variables.tf

@@ -20,6 +20,10 @@ variable "iam_instance_profile" {}
 
 variable "volume_size" {}
 
+variable "ebs_volume_size" {
+  default = 1000
+}
+
 variable "vpc_security_group_ids" {}
 
 variable "subnet_id" {}

deploy/aws/provision/tasks/common/main.yml

@@ -19,6 +19,29 @@
   with_items:
     - qed
 
+- name: Register stat on EBS device
+  stat:
+    path: /dev/xvdc
+    get_attributes: no
+    get_checksum: no
+  register: ebs_device
+
+- name: Create xfs filesystem on EBS volume
+  filesystem:
+    force: yes
+    fstype: xfs
+    dev: "{{ ebs_device.stat.path }}"
+  when: ebs_device.stat.exists
+
+- name: Mount xfs filesystem on /var/qed
+  mount:
+    path: /var/qed
+    src: "{{ ebs_device.stat.path }}"
+    fstype: xfs
+    state: mounted
+    opts: noatime
+  when: ebs_device.stat.exists
+
 - name: Install additional packages
   yum:
     name: "{{ packages }}"