Fix demo vagrant server by making hostname resolve

demo/vagrant/Vagrantfile

@@ -19,6 +19,9 @@ sudo mv nomad /usr/bin/nomad
 sudo mkdir -p /etc/nomad.d
 sudo chmod a+w /etc/nomad.d
 
+# Set hostname's IP to made advertisement Just Work
+sudo sed -i -e "s/.*nomad.*/$(ip route get 1 | awk '{print $NF;exit}') nomad/" /etc/hosts
+
 SCRIPT
 
 Vagrant.configure(2) do |config|

demo/vagrant/server.hcl

@@ -12,8 +12,10 @@ server {
     bootstrap_expect = 1
 }
 
-advertise {
-  http = "localhost"
-  rpc = "localhost"
-  serf = "localhost"
-}
+# Advertise must be set to a non-loopback address.
+# Defaults to the resolving the local hostname.
+#advertise {
+#    http = "10.0.2.1"
+#    rpc  = "10.0.2.1"
+#    serf = "10.0.2.1"
+#}

website/source/intro/getting-started/cluster.html.md

@@ -33,6 +33,14 @@ server {
     # Self-elect, should be 3 or 5 for production
     bootstrap_expect = 1
 }
+
+# Advertise must be set to a non-loopback address.
+# Defaults to the resolving the local hostname.
+#advertise {
+#    http = "10.0.2.1"
+#    rpc  = "10.0.2.1"
+#    serf = "10.0.2.1"
+#}
 ```
 
 This is a fairly minimal server configuration file, but it