Why use a VPN? Within cloud computing, there are various types of sites and services not meant for public consumption (e.g. analytics software, databases, log servers, etc.). For security reasons, it’s best to keep these accesssible only via the private network, which is behind the firewall.
To provide access to these resources, a virtual private network (VPN) should be used, with network access granted only to trusted individuals within the organization.
When working with OpenStack as an infrastructure-as-a-service (IaaS) cloud-computing platform, it’s rather convenient to be able to interface with it via its command-line interface (CLI).
While the service is typically installed on the Ubuntu Long-Term Support (LTS) operating system (OS), which has releases every two years, running the CLI from other OSes, such as interim Ubuntu releases, is often necessary. However, it is currently not possible to install the command-line client with supported Debian packages on Ubuntu 19.