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Setting up failover with keepalived
When we host important sites or applications, especially those that may be critical to 
conducting business, high availability is a valuable addition to increase stability. In 
short, if we have a single server that serves a single resource, then we will experience 
downtime if something were to happen to that server. We may be able to recover 
from this situation fairly quickly by using a template, image, or some other backup 
and restore methodology to get back to a working state, but it's even faster to recover 
from such a situation if we are able to direct our users to an alternate server while 
we fix the primary, or implement some sort of logic to enable us to route users away 
from a problematic server.
There are many ways a situation like this can be handled, and 
keepalived
 is one 
way we can see this in action quickly, as setting it up is fairly straightforward. 
Before we continue though, note that implementing a high availability or similar 
solution manually only makes sense for virtual servers or physical infrastructure you 
maintain yourself, as many cloud providers have their own solution you can use for 
the same purpose. Therefore, this section has the most value to those that manage 
and maintain their own network rather than using a cloud platform.
Using 
keepalived
 is a great way to add high availability to an application or even 
a hosted website. 
keepalived
 allows you to configure a floating IP (also known as 
a