Use node attribute to determine IP

${attr.unique.network.ip-address} has the host's IP. Use that for
`-retry-join` instead of assuming the user mode networking IP
(10.0.2.15).

Author: sorenisanerd

mkosi.images/terraform/share/terraform/consul.nomad

@@ -34,10 +34,10 @@ job "consul" {
       template {
         data = <<-EOF
         encrypt   = "{{ with secret "secrets/mangos/consul/gossip" }}{{ .Data.encryption_key | trimSpace }}{{ end }}"
-        node_name = "consul-api-{{ env "NOMAD_SHORT_ALLOC_ID" }}"
         addresses {
           dns = "0.0.0.0"
         }
+        node_name = "consul-api-{{ env "NOMAD_SHORT_ALLOC_ID" }}"
         acl {
           enabled = true
           tokens {
@@ -52,11 +52,17 @@ job "consul" {
         destination = "${NOMAD_SECRETS_DIR}/consul.hcl"
         change_mode = "restart"
       }
+
       driver = "docker"
+
+      env {
+        HOST_IP = "${attr.unique.network.ip-address}"
+      }
+
       config {
         image = "hashicorp/consul"
         args  = ["agent",
-                 "-retry-join", "10.0.2.15",
+                 "-retry-join", "${HOST_IP}",
                  "-datacenter", "${NOMAD_REGION}-${NOMAD_DC}",
                  "-config-file", "${NOMAD_SECRETS_DIR}/consul.hcl"]
       }