register instance profile for ssm and allow ping

hosts/arrow/aws/ec2.tf

@@ -1,5 +1,6 @@
 resource "aws_instance" "instance" {
   ami                    = aws_ami.image.id
+  iam_instance_profile   = aws_iam_instance_profile.instance.name
   instance_type          = var.ec2_size
   vpc_security_group_ids = [aws_security_group.instance.id]
 
@@ -21,6 +22,14 @@ resource "aws_security_group" "instance" {
   description = "Allow SSH and HTTPS"
   vpc_id      = data.aws_vpc.vpc.id
 
+  ingress {
+    description = "Ping"
+    from_port   = -1
+    to_port     = -1
+    protocol    = "icmp"
+    cidr_blocks = ["0.0.0.0/0"]
+  }
+
   ingress {
     description = "SSH"
     from_port   = 22
@@ -45,3 +54,40 @@ resource "aws_security_group" "instance" {
     ipv6_cidr_blocks = ["::/0"]
   }
 }
+
+# Setup IAM for the instance to use SSM
+data "aws_iam_policy_document" "instance_profile" {
+  statement {
+    actions = ["sts:AssumeRole"]
+    principals {
+      type        = "Service"
+      identifiers = ["ec2.amazonaws.com"]
+    }
+  }
+}
+
+data "aws_iam_policy_document" "instance_profile" {
+  statement {
+    actions = [
+      "s3:ListAllMyBuckets",
+    ]
+    resources = ["*"]
+  }
+}
+
+resource "aws_iam_role" "instance_profile" {
+  name               = "nixos"
+  assume_role_policy = data.aws_iam_policy_document.instance_profile.json
+  inline_policy {
+    name   = "instance-profile"
+    policy = data.aws_iam_policy_document.instance_profile.json
+  }
+}
+resource "aws_iam_role_policy_attachment" "instance_ssm" {
+  role       = aws_iam_role.instance_profile.name
+  policy_arn = "arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore"
+}
+resource "aws_iam_instance_profile" "instance" {
+  name = "nixos"
+  role = aws_iam_role.instance_profile.name
+}