using hostnames in the inventory is more readable

inventory/inventory.example

 [downloader]
-10.99.0.26
+node1 ansible_ssh_host=10.99.0.26
 
 [kube-master]
-10.99.0.26
-10.99.0.27
+node1 ansible_ssh_host=10.99.0.26
+node2 ansible_ssh_host=10.99.0.27
 
 [etcd]
-10.99.0.26
-10.99.0.27
-10.99.0.4
+node1 ansible_ssh_host=10.99.0.26
+node2 ansible_ssh_host=10.99.0.27
+node3 ansible_ssh_host=10.99.0.4
 
 [kube-node]
-10.99.0.27
-10.99.0.4
-10.99.0.5
-10.99.0.36
-10.99.0.37
+node2 ansible_ssh_host=10.99.0.27
+node3 ansible_ssh_host=10.99.0.4
+node4 ansible_ssh_host=10.99.0.5
+node5 ansible_ssh_host=10.99.0.36
+node6 ansible_ssh_host=10.99.0.37
 
 [paris]
-10.99.0.26
-10.99.0.4 local_as=xxxxxxxx
-10.99.0.5 local_as=xxxxxxxx
+node1 ansible_ssh_host=10.99.0.26
+node3 ansible_ssh_host=10.99.0.4 local_as=xxxxxxxx
+node4 ansible_ssh_host=10.99.0.5 local_as=xxxxxxxx
 
 [new-york]
-10.99.0.36 local_as=xxxxxxxx
-10.99.0.37 local_as=xxxxxxxx
+node2 ansible_ssh_host=10.99.0.27
+node5 ansible_ssh_host=10.99.0.36 local_as=xxxxxxxx
+node6 ansible_ssh_host=10.99.0.37 local_as=xxxxxxxx
 
 [k8s-cluster:children]
 kube-node