c12s-kubespray/contrib/aws_inventory/kubespray-aws-inventory.py

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#!/usr/bin/env python
from __future__ import print_function
import boto3
import os
import argparse
import json
class SearchEC2Tags(object):
def __init__(self):
self.parse_args()
if self.args.list:
self.search_tags()
if self.args.host:
data = {}
print(json.dumps(data, indent=2))
def parse_args(self):
##Check if VPC_VISIBILITY is set, if not default to private
if "VPC_VISIBILITY" in os.environ:
self.vpc_visibility = os.environ['VPC_VISIBILITY']
else:
self.vpc_visibility = "private"
##Support --list and --host flags. We largely ignore the host one.
parser = argparse.ArgumentParser()
parser.add_argument('--list', action='store_true', default=False, help='List instances')
parser.add_argument('--host', action='store_true', help='Get all the variables about a specific instance')
self.args = parser.parse_args()
def search_tags(self):
hosts = {}
hosts['_meta'] = { 'hostvars': {} }
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##Search ec2 three times to find nodes of each group type. Relies on kubespray-role key/value.
for group in ["kube_control_plane", "kube-node", "etcd"]:
hosts[group] = []
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tag_key = "kubespray-role"
tag_value = ["*"+group+"*"]
region = os.environ['REGION']
ec2 = boto3.resource('ec2', region)
filters = [{'Name': 'tag:'+tag_key, 'Values': tag_value}, {'Name': 'instance-state-name', 'Values': ['running']}]
cluster_name = os.getenv('CLUSTER_NAME')
if cluster_name:
filters.append({'Name': 'tag-key', 'Values': ['kubernetes.io/cluster/'+cluster_name]})
instances = ec2.instances.filter(Filters=filters)
for instance in instances:
##Suppose default vpc_visibility is private
dns_name = instance.private_dns_name
ansible_host = {
'ansible_ssh_host': instance.private_ip_address
}
##Override when vpc_visibility actually is public
if self.vpc_visibility == "public":
dns_name = instance.public_dns_name
ansible_host = {
'ansible_ssh_host': instance.public_ip_address
}
##Set when instance actually has node_labels
node_labels_tag = list(filter(lambda t: t['Key'] == 'kubespray-node-labels', instance.tags))
if node_labels_tag:
ansible_host['node_labels'] = dict([ label.strip().split('=') for label in node_labels_tag[0]['Value'].split(',') ])
hosts[group].append(dns_name)
hosts['_meta']['hostvars'][dns_name] = ansible_host
hosts['k8s-cluster'] = {'children':['kube_control_plane', 'kube-node']}
print(json.dumps(hosts, sort_keys=True, indent=2))
SearchEC2Tags()