diff --git a/packer/web.pkr.hcl b/packer/web.pkr.hcl
index f83e151..d176395 100644
--- a/packer/web.pkr.hcl
+++ b/packer/web.pkr.hcl
@@ -8,6 +8,11 @@ variable "aws_region" {
   default = "${env("AWS_REGION")}"
 }
 
+variable "fathom_site_id" {
+  type    = string
+  default = "${env("FATHOM_SITE_ID")}"
+}
+
 variable "s3_bucket" {
   type = string
   default = "${env("S3_BUCKET")}"
@@ -81,6 +86,7 @@ build {
     environment_vars = [
       "ADMIN_PASSWORD=${var.admin_password}",
       "AWS_REGION=${var.aws_region}",
+      "FATHOM_SITE_ID=${var.fathom_site_id}",
       "S3_BUCKET=${var.s3_bucket}",
       "SUPERVISOR_ACCESS_TOKEN=${var.supervisor_access_token}",
     ]
diff --git a/tf/asg.tf b/tf/asg.tf
index 9b2fa7e..4372705 100644
--- a/tf/asg.tf
+++ b/tf/asg.tf
@@ -78,12 +78,10 @@ resource "aws_launch_template" "server" {
 resource "aws_autoscaling_group" "server" {
   name = "riju-server"
 
-  availability_zones = [
-    for subnet in data.aws_subnet.default : subnet.availability_zone
-  ]
-  desired_capacity = 1
-  min_size         = 1
-  max_size         = 3
+  availability_zones = [local.primary_az]
+  desired_capacity   = 1
+  min_size           = 1
+  max_size           = 3
 
   launch_template {
     id = aws_launch_template.server.id
diff --git a/tf/cloudwatch.tf b/tf/cloudwatch.tf
index d37a845..e789878 100644
--- a/tf/cloudwatch.tf
+++ b/tf/cloudwatch.tf
@@ -60,7 +60,7 @@ resource "aws_cloudwatch_metric_alarm" "server_data_volume_disk_space" {
   insufficient_data_actions = [aws_sns_topic.riju.arn]
   dimensions = {
     AutoScalingGroupName = aws_autoscaling_group.server.name
-    path                 = "/mnt/riju/data"
+    path                 = "/mnt/riju"
   }
 
   tags = {
diff --git a/tf/main.tf b/tf/main.tf
index 6047721..5f002a7 100644
--- a/tf/main.tf
+++ b/tf/main.tf
@@ -55,3 +55,7 @@ data "aws_subnet" "default" {
   for_each = data.aws_subnet_ids.default.ids
   id       = each.value
 }
+
+locals {
+  primary_az = sort([for subnet in data.aws_subnet.default : subnet.availability_zone])[0]
+}
diff --git a/tf/ssm.tf b/tf/ssm.tf
index f03c6f1..7aa5675 100644
--- a/tf/ssm.tf
+++ b/tf/ssm.tf
@@ -1,3 +1,10 @@
+resource "aws_ssm_parameter" "web_ami_id" {
+  name      = "riju-web-ami-id"
+  type      = "String"
+  value     = data.aws_ami.server.id
+  data_type = "aws:ec2:image"
+}
+
 resource "aws_ssm_parameter" "ci_ami_id" {
   name      = "riju-ci-ami-id"
   type      = "String"
@@ -22,3 +29,9 @@ resource "aws_ssm_parameter" "s3_bucket" {
   type  = "String"
   value = aws_s3_bucket.riju.bucket
 }
+
+resource "aws_ssm_parameter" "asg_desired_capacity" {
+  name  = "riju-asg-desired-capacity"
+  type  = "String"
+  value = aws_autoscaling_group.server.desired_capacity
+}