Updating batch processes, such as jobs and CronJobs, is relatively easy. Since they have a limited lifetime, the simplest strategy of updating code or configurations is just to update the resources in question before they are used again.
Long-running processes are a little harder to deal with, and even harder to manage if you are exposing a service to the network. Kubernetes provides us with the deployment resource to make deploying and, more importantly, updating long-running processes simpler.
In Chapter 2, Start Your Engines, we took a first look at the deployment resource, both creating deployments with kubectl run and by defining a deployment object in a YAML file. In this chapter, we ...
