According to examples, a host device may be instructed to pre-spawn a number of first host processes and a number of second host processes, in which the number of first host processes and the number of second host processes are defined in a first scaling constraint and are each greater than or equal to one. The host device may pre-spawn the second host processes in one or more computing nodes through identification of a host process of the first host processes that is unbound from a client session, termination of the identified host process, and pre-spawning of a second host process that provides a second version of the service based on the termination. The host device may also decrease the number of first host processes and increase the number of second host processes in the one or more computing nodes as defined in a second scaling constraint.