Ensuring HA and FT on Kubernetes
First, let's quickly recap on how we define HA and FT and how they differ. These are key concepts in cloud applications that describe the ability of a system or a solution to be continuously operational for a desirably long length of time. From a system end user perspective, the aspect of availability, alongside data consistency, is usually the most important requirement.
High Availability
In short, the term availability in systems engineering describes the percentage of time when the system is fully functional and operation for the end user. In other words, it is a measure of system uptime divided by the sum of uptime and downtime (which is basically total time). For example, if, in the last 30 days (720 hours), your cloud application had 1 hour of unplanned maintenance and was not available to the end user, it means that the availability measure of your application is 
. Usually, to simplify the notation when designing systems, the availability...