wip ansible inventory

.gitignore

@@ -1,4 +1,5 @@
 .vagrant
 kubernetes/
 etcd*/
-cluster.config
+cluster.config
+inventory/generated

Vagrantfile

@@ -4,6 +4,19 @@ require 'open-uri'
 
 Vagrant.require_version ">= 2.2.4"
 
+unless Vagrant.has_plugin?("vagrant-scp")
+  raise 'vagrant-scp is not installed! Please run vagrant plugin install vagrant-scp'
+end
+
+hosts = {
+  masters: [
+    "master-node"
+  ],
+  workers: (1..2).map { |i| "worker-node-#{i}" }
+}
+
+generated_ansible_inventory_file="./inventory/generated"
+
 Vagrant.configure("2") do |config|
   config.vm.box = "debian/stretch64"
   config.vm.box_version = "= 9.9.1"
@@ -13,26 +26,32 @@ Vagrant.configure("2") do |config|
   # greet from every configured VM, revealing its hostname
   config.vm.provision "shell", inline: "echo Hello from \$HOSTNAME"
 
-  config.vm.define "master-node" do |node|
-    node.vm.hostname = "master-node"
-    
-    node.vm.provider :virtualbox do |v|
-      v.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
-      v.customize ["modifyvm", :id, "--memory", 512]
-      v.customize ["modifyvm", :id, "--name", "master-node"]
-    end
-  end
-  
-  (1..2).each do |i|
-    config.vm.define "worker-node-#{i}" do |node|
-      node.vm.hostname = "worker-node-#{i}"
-    
+  (hosts[:masters] + hosts[:workers]).each do |node_name|
+    config.vm.define node_name do |node|
+      node.vm.hostname = node_name
+      
       node.vm.provider :virtualbox do |v|
         v.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
         v.customize ["modifyvm", :id, "--memory", 512]
-        v.customize ["modifyvm", :id, "--name", "worker-node-#{i}"]
+        v.customize ["modifyvm", :id, "--name", node_name]
       end
     end
   
   end
+  
+  config.trigger.after :up do |trigger|
+    File.open(generated_ansible_inventory_file, "w") do |w|
+      w.puts "[masters]"        
+      hosts[:masters].each { |host| w.puts host }
+
+      w.puts "[workers]"
+      hosts[:workers].each { |host| w.puts host }
+    end
+  end
+  
+  """
+  config.trigger.after :destroy do |trigger|
+    File.delete(generated_ansible_inventory_file) if File.exist?(generated_ansible_inventory_file)
+  end
+  """
 end

ansible.cfg

@@ -0,0 +1,3 @@
+[defaults]
+remote_tmp = /tmp/$USER/ansible
+inventory = inventory/

inventory/vagrant.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# Shameless copy of https://gist.github.com/d-a-n/baabf3b010a6851f0e84
+import argparse
+import json
+import paramiko
+import subprocess
+import sys
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description="Vagrant inventory script")
+    group = parser.add_mutually_exclusive_group(required=True)
+    group.add_argument('--list', action='store_true')
+    group.add_argument('--host')
+    return parser.parse_args()
+
+
+def list_running_hosts():
+    cmd = "vagrant status --machine-readable"
+    status = subprocess.check_output(cmd.split()).rstrip()
+    hosts = []
+    for line in status.split('\n'):
+        (_, host, key, value) = line.split(',',3)
+        if key == 'state' and value == 'running':
+            hosts.append(host)
+    return hosts
+
+
+def get_host_details(host):
+    cmd = "vagrant ssh-config {}".format(host)
+    p = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+    config = paramiko.SSHConfig()
+    config.parse(p.stdout)
+    c = config.lookup(host)
+    return {'ansible_ssh_host': c['hostname'],
+            'ansible_ssh_port': c['port'],
+            'ansible_ssh_user': c['user'],
+            'ansible_ssh_private_key_file': c['identityfile'][0]}
+
+
+def main():
+    args = parse_args()
+    if args.list:
+        hosts = list_running_hosts()
+        json.dump({'vagrant': hosts}, sys.stdout)
+    else:
+        details = get_host_details(args.host)
+        json.dump(details, sys.stdout)
+
+if __name__ == '__main__':
+    main()