Installing Juju a service orchestration framework

Up to now in this chapter, we have learned about virtualization and OpenStack for deploying and managing virtual servers. Now, it's time to look at a service-modeling tool, Juju. Juju is a service-modeling tool for Ubuntu. Connect it to any cloud service, model your application, and press deploy—done. Juju takes care of lower-level configuration, deployments, and scaling, and even monitors your services.

Juju is an open source tool that offers a GUI and command-line interface for modeling your service. Applications are generally deployed as collections of multiple services. For example, to deploy WordPress, you need a web server, a database system, and perhaps a load balancer. Service modeling refers to the relations between these services. Services are defined with the help of charms, which are collections of configurations and deployment instructions, such as dependencies and resource requirements. The Juju store provides more than 300 predefined...