Is it possible to update subuid / subgid ranges for a user ?

[nlgranger]

I'm managing a cluster with dynamic users (ldap) and allocating 16 bits of subuid and subgid range to every user is not manageable.

Since only a few users are running a job on a server at a time, I'd like to dynamically add and remove ranges in /etc/subuid and /etc/subgid as users come and go.

Is it going to cause a problem if the subuid and subgid ranges change between sessions ? Do they need to remain consistent for a given user ?