Get private ip from AWS from instances with tags filters: Env:test

get_privateIP_tags.py

import boto3
from string import Template

'''
Return values of key value instance
'''

class EC2:

    def get_tags(self,instance):
        for t in instance:
            if t['Key'] == 'Name':
                return t['Value']
        return None

    def get_ip(self):

        key = "Env"
        value = "test"

        ip_private = {}
        #ec2 = boto3.resource('ec2')
        ec2 = boto3.client('ec2',region_name='us-east-1')

        #instances = ec2.instances.filter(
        instances = ec2.describe_instances(
                Filters=[
                    {
                        'Name': 'tag:%s' %key,
                        'Values': [
                            '%s' %value
                    ]}])

        for instance in instances['Reservations']:
            for ip in instance['Instances']:
                ip_private[self.get_tags(ip['Tags'])] = ip['PrivateIpAddress']

        return ip_private

    node_entry = Template("""  - hostname: $hostname
    ip: $ipaddress""")

    node_section = Template("""---
nodes:
$nodes
    """)


    def get_node_entry(self,hostname,ipaddress):
        return self.node_entry.substitute(hostname=hostname,ipaddress=ipaddress)

    def get_node_entries(self):
        nodes = []
        for k,v in self.get_ip().iteritems():
            nodes.append(self.get_node_entry(k,v))
        return '\n'.join(nodes)

    def get_nodes_output(self):
        return self.node_section.substitute(nodes=self.get_node_entries())


def main():
    f = open('nodes','w')
    ec2 = EC2()
    f.write(ec2.get_nodes_output())
    f.close()
    print (ec2.get_ip())


if __name__ == '__main__':
    main()