The upstart scripts override the log_file option in the configuration files by explicitly configuring them when launching daemons.
For example, from /etc/init/glance-api.conf:
script ... [ "x$USE_LOGFILE" != "xno" ] && DAEMON_ARGS="$DAEMON_ARGS --log-file=/var/log/glance/glance-api.log"
The upstart scripts override the log_file option in the configuration files by explicitly configuring them when launching daemons.
For example, from /etc/init/ glance- api.conf:
script ARGS="$ DAEMON_ ARGS --log-file= /var/log/ glance/ glance- api.log"
...
[ "x$USE_LOGFILE" != "xno" ] && DAEMON_