"High availability" is a term frequently used to designate a service or system architecture that must be available as continuously as possible, ideally 100% of the time.
It is very important for companies to install high availability technologies for information systems that serve as the central nervous system of their organisation. They can be implemented in a number of different ways, namely from either a physical or a logical point of view.
There are excellent open source tools designed to ensure that services are always responsive. Keepalived, for example, operates like a router to guide queries based on service status, while Linux-HA enables communications between servers, allowing for the modification of configurations on the fly, based on the status of the other servers on the network.

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