userdata.py 文件源码

def gen_etc_hosts(self, client, net):
        """Generate /etc/hosts file containing all subnet hosts

        Makes it possible to register k8s nodes by hostname.
        Disgusting hack to make up for OVH's terrible DNS.
        """
        from ipaddress import IPv4Network

        subnet = client.get('/cloud/project/{}/network/private/{}/subnet'.format(client._project, net))[0]
        hosts = IPv4Network(subnet['cidr']).hosts()
        hosts_content = compress(
            ('127.0.0.1\tlocalhost\n' + '::1\t\tlocalhost\n' +
             '\n'.join(['{}\t{}'.format(ip, 'host-'+str(ip).replace('.', '-')) for ip in hosts]) + '\n').encode()
        )

        self.add_files([
            {
                'filesystem': 'root',
                'path': '/etc/hosts',
                'mode': 420, # 0644
                'contents': {
                    'source': 'data:,' + quote(hosts_content),
                    'compression': 'gzip'
                }
            }
        ])