77 lines
2.6 KiB
Python
Executable File
77 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python
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from __future__ import print_function
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import boto3
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import os
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import argparse
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import json
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class SearchEC2Tags(object):
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def __init__(self):
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self.parse_args()
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if self.args.list:
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self.search_tags()
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if self.args.host:
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data = {}
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print(json.dumps(data, indent=2))
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def parse_args(self):
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##Check if VPC_VISIBILITY is set, if not default to private
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if "VPC_VISIBILITY" in os.environ:
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self.vpc_visibility = os.environ['VPC_VISIBILITY']
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else:
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self.vpc_visibility = "private"
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##Support --list and --host flags. We largely ignore the host one.
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parser = argparse.ArgumentParser()
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parser.add_argument('--list', action='store_true', default=False, help='List instances')
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parser.add_argument('--host', action='store_true', help='Get all the variables about a specific instance')
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self.args = parser.parse_args()
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def search_tags(self):
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hosts = {}
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hosts['_meta'] = { 'hostvars': {} }
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##Search ec2 three times to find nodes of each group type. Relies on kubespray-role key/value.
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for group in ["kube_control_plane", "kube_node", "etcd"]:
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hosts[group] = []
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tag_key = "kubespray-role"
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tag_value = ["*"+group+"*"]
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region = os.environ['REGION']
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ec2 = boto3.resource('ec2', region)
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filters = [{'Name': 'tag:'+tag_key, 'Values': tag_value}, {'Name': 'instance-state-name', 'Values': ['running']}]
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cluster_name = os.getenv('CLUSTER_NAME')
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if cluster_name:
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filters.append({'Name': 'tag-key', 'Values': ['kubernetes.io/cluster/'+cluster_name]})
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instances = ec2.instances.filter(Filters=filters)
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for instance in instances:
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##Suppose default vpc_visibility is private
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dns_name = instance.private_dns_name
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ansible_host = {
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'ansible_ssh_host': instance.private_ip_address
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}
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##Override when vpc_visibility actually is public
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if self.vpc_visibility == "public":
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dns_name = instance.public_dns_name
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ansible_host = {
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'ansible_ssh_host': instance.public_ip_address
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}
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##Set when instance actually has node_labels
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node_labels_tag = list(filter(lambda t: t['Key'] == 'kubespray-node-labels', instance.tags))
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if node_labels_tag:
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ansible_host['node_labels'] = dict([ label.strip().split('=') for label in node_labels_tag[0]['Value'].split(',') ])
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hosts[group].append(dns_name)
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hosts['_meta']['hostvars'][dns_name] = ansible_host
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hosts['k8s_cluster'] = {'children':['kube_control_plane', 'kube_node']}
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print(json.dumps(hosts, sort_keys=True, indent=2))
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SearchEC2Tags()
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