The file debian/init.d has some issues:

• The name is set to "MongoDB". By convention this should be all lower case

• DAEMONUSER is set to a hard coded value after /etc/default/$NAME has been read which makes it impossible to override the user

• DAEMON_OPTS should be composed after /etc/default/$NAME is read (and only if $DAEMON_OPTS is not already set). That would allow default to set things like the data directory easily (the single most likely thing someone would want to set)

• DAEMONUSER is explicitly set and is a failure if not existing. Later on there are codepaths for it being set or not. Make your mind up

• Part of that checking sets DAEMONUID/GID but never uses them. The other tools used such as start_stop_daemon use the textual name and report errors, so leave all this user stuff up to them.

• For reload_server, the comment says SIGHUP is sent but the code sends USR1. The comment has no value and should be removed

• The main switch/case loop has a bunch of commented out code for reload. Delete it. Also reload_server() exists, so use it!