How to implement redundancy of processes on the server?

Question

linux

You need to create a server reservation. I created a virtual IP with the keepalived utility (if there are more convenient analogues, please tell me). How now, when the master falls on the slave, not only would the IP be transferred, but also the process I need was launched? Also, during the workflow, a lot of information is contained in the operative, and if the server crashes, you don’t want to lose it, what are the options for transferring information? While guessed, only to a cluster of servers.

Answer 1

guessed correctly.
read more about clusters.

Answer 2

what kind of demon is that?
can you tell me a little about yourself?