c12s-kubespray/contrib/aws_inventory/kubespray-aws-inventory.py
Mateus Caruccio 087b7fa38e Set node labels from AWS instance tag (#3544)
Set kubernetes node labels from a given comma-separated list of `key=value` from AWS instance tag `kubespray-node-labels`.
2018-11-14 00:21:56 -08:00

69 lines
2.4 KiB
Python
Executable file

#!/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': {} }
##Search ec2 three times to find nodes of each group type. Relies on kubespray-role key/value.
for group in ["kube-master", "kube-node", "etcd"]:
hosts[group] = []
tag_key = "kubespray-role"
tag_value = ["*"+group+"*"]
region = os.environ['REGION']
ec2 = boto3.resource('ec2', region)
instances = ec2.instances.filter(Filters=[{'Name': 'tag:'+tag_key, 'Values': tag_value}, {'Name': 'instance-state-name', 'Values': ['running']}])
for instance in instances:
node_labels_tag = list(filter(lambda t: t['Key'] == 'kubespray-node-labels', instance.tags))
node_labels = ''
if node_labels_tag:
node_labels = dict([ label.strip().split('=') for label in node_labels_tag[0]['Value'].split(',') ])
if self.vpc_visibility == "public":
hosts[group].append(instance.public_dns_name)
hosts['_meta']['hostvars'][instance.public_dns_name] = {
'ansible_ssh_host': instance.public_ip_address,
'node_labels': node_labels
}
else:
hosts[group].append(instance.private_dns_name)
hosts['_meta']['hostvars'][instance.private_dns_name] = {
'ansible_ssh_host': instance.private_ip_address,
'node_labels': node_labels
}
hosts['k8s-cluster'] = {'children':['kube-master', 'kube-node']}
print(json.dumps(hosts, sort_keys=True, indent=2))
SearchEC2Tags()