"usermod -d ..." fails

[mimmus]

I need set only ssh keys for the user 'mysql" but I get:

Error: Could not set home on user[mysql]: Execution of '/sbin/usermod -d /home/mysql mysql' returned 8: usermod: user mysql is currently used by process 2621
Error: /Stage[main]/Accounts/Accounts::User[mysql]/User[mysql]/home: change from /var/lib/mysql to /home/mysql failed: Could not set home on user[mysql]: Execution of '/sbin/usermod -d /home/mysql mysql' returned 8: usermod: user mysql is currently used by process 2621

Added:
managehome: false
but no luck.

[deric]

From man usermod:

CAVEATS
       You must make certain that the named user is not executing any processes when this command is being executed if the user's numerical user
       ID, the user's name, or the user's home directory is being changed.  usermod checks this on Linux, but only check if the user is logged in
       according to utmp on other architectures.

seems like you're running mysql as a logged user (e.g. root)