Configure the python interpreter based on OS

CentOS has python 2.x installed and Ubuntu 16.04 has python 3.x. Hosts
belong to the group centos or ubuntu. Inventory example attached.

.gitignore

@@ -6,6 +6,8 @@ group_vars/explorer
 group_vars/validator
 group_vars/netstat
 group_vars/moc
+group_vars/ubuntu
+group_vars/centos
 
 roles/bootnode/vars/main.yml
 roles/explorer/vars/main.yml

Vagrantfile

@@ -5,9 +5,10 @@ Vagrant.configure("2") do |config|
 
   servers = [ "validator", "explorer", "moc", "bootnode", "netstat" ]
 
-  if ENV["poa_platform"] == "ubuntu"
+  platform_os = ENV["poa_platform"]
+  if platform_os == "ubuntu"
     platform = "ubuntu/xenial64"
-  elsif ENV["poa_platform"] == "centos"
+  elsif platform_os == "centos"
     platform = "centos/7"
   else
     platform = "ubuntu/xenial64"
@@ -26,8 +27,9 @@ Vagrant.configure("2") do |config|
           "explorer" => ["explorer"],
           "netstat" => ["netstat"],
           "moc" => ["moc"],
-          "bootnode" => ["bootnode"]
+          "bootnode" => ["bootnode"],
         }
+        ansible.groups[platform_os] = [ "validator", "explorer", "netstat", "moc", "bootnode" ]        
       end
 
       node.vm.provision :shell do |shell|

aws/group_vars/all.yml.example

@@ -1,5 +1,6 @@
-access_key: "INSERT KEY HERE"
-secret_key: "INSERT SECRET HERE"
+---
+ssh_root:
+    - "{{ lookup('file', 'files/admins.pub') }}"
 
 awskeypair_name: "keypairname"
 image: "ami-0b383171"

group_vars/centos.example

@@ -0,0 +1,3 @@
+# CentsOS-specific variables
+
+ansible_python_interpreter: /usr/bin/python

group_vars/ubuntu.example

@@ -0,0 +1,3 @@
+# Ubuntu-specific variables
+
+ansible_python_interpreter: /usr/bin/python3

hosts.example

@@ -9,12 +9,15 @@
 #   - A hostname/ip can be a member of multiple groups
 
 [bootnode]
-1.1.1.1 ansible_user=ubuntu | centos
+node01.example.com
+
 [moc]
+node02.example.com
 
 [netstat]
 
 [validator]
+node03.example.com
 
 [explorer]
 
@@ -24,3 +27,10 @@ moc
 netstat
 validator
 explorer
+
+[centos]
+node03.example.com
+
+[ubuntu]
+node01.example.com
+node02.example.com