python-hostsresolver 0.0.3

Translate ephemeral virtual machines names into IP addresses for python projects without requiring

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Translate ephemeral virtual machines names into IP addresses for python projects without requiring any modification to the libraries or any external domain name server.

Background

When performing integration testing using ephemeral virtual machines, it is not always convenient to have a real domain name server to resolve the IP address of each virtual machine, especially if multiple instances of this test is to be ran simultaneously on the same host.

In most of the cases, it is possible to use directly the IP addresses of the virtual machines but in some other cases the domain name must be used. This is the case for Openstack Keystone where the catalog contains the URL of the services.

Supported setup

This project is specifically designed for python projects interacting with Openstack virtual machines managed by Vagrant. It is however possible to make it resolve any name by providing the content of a hosts file.

Usage

### Standard setup ###

The IP addresses of Vagrant managed virtual machines will be mapped to the name provided to Vagrant as if it was a hostname. vagrant ssh-config will be used internally to fetch the IP address.

>>> from hostsresolver import vagrant_source as resolver
>>> resolver.install('vagrant_project_folder/')

### Using hostmanager plugin ###

It is possible to specify the virtual machine used to download the hostsfile. If not provided, the first available virtual machine will be used. In this case, we will use /etc/hosts downloaded from dns.example.org.

>>> from hostsresolver import vagrant_hostmanager_source as resolver
>>> resolver.install('vagrant_project_folder/', 'dns.example.org')

### Using a custom hosts file ###

To simply override some domain name addresses, a custom hosts file may be loaded.

>>> from hostsresolver import hostsfile_source as resolver
>>> resolver.install('my_project_folder/hosts')

Licence

Licensed under the Apache License, Version 2.0

Contributing

Feel free to raise issues and send some pull request, we’ll be happy to look at them!