### BEGIN INIT INFO
# Provides:          myapp
# Required-Start:    $remote_fs $syslog $mysql $postfix
# Required-Stop:     $remote_fs $syslog $mysql $postfix
# Should-Start:
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Starts myapp daemon processes
# Description:       Start myapp daemon : /opt/myapp/bin/myapp.pl
### END INIT INFO

root@raspberrypi:/var/log# systemctl disable myapp
Synchronizing state for myapp.service with sysvinit using update-rc.d...
Executing /usr/sbin/update-rc.d myapp defaults
Executing /usr/sbin/update-rc.d myapp disable
insserv: warning: current start runlevel(s) (empty) of script `myapp' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `myapp' overrides LSB defaults (0 1 6).

root@raspberrypi:/var/log# systemctl enable myapp
Synchronizing state for myapp.service with sysvinit using update-rc.d...
Executing /usr/sbin/update-rc.d myapp defaults
insserv: warning: current start runlevel(s) (empty) of script `myapp' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `myapp' overrides LSB defaults (0 1 6).
Executing /usr/sbin/update-rc.d myapp enable

root@raspberrypi:/var/log# runlevel
N 5

root@raspberrypi:/var/log# ls -l /etc/rc5.d/
total 4
lrwxrwxrwx 1 root root  22 Sep 23 03:18 K01avahi-daemon -> ../init.d/avahi-daemon
lrwxrwxrwx 1 root root  23 Jan 20 06:28 K01bind9myapp -> ../init.d/bind9myapp
lrwxrwxrwx 1 root root  21 Dec 21 23:47 K01bind9ttdnsd -> ../init.d/bind9ttdnsd
lrwxrwxrwx 1 root root  16 May 27  2016 K01dhcpcd -> ../init.d/dhcpcd
lrwxrwxrwx 1 root root  17 Dec 21 06:13 K01privoxy -> ../init.d/privoxy
lrwxrwxrwx 1 root root  16 Dec 21 06:11 K01ttdnsd -> ../init.d/ttdnsd
lrwxrwxrwx 1 root root  18 Jan 20 06:46 K02redsocks -> ../init.d/redsocks
lrwxrwxrwx 1 root root  13 Jan 19 14:15 K02tor -> ../init.d/tor
lrwxrwxrwx 1 root root  15 Dec 21 06:11 K03bind9 -> ../init.d/bind9
lrwxrwxrwx 1 root root  17 Sep 20 09:23 K03dnsmasq -> ../init.d/dnsmasq
-rw-r--r-- 1 root root 677 Apr  6  2015 README
lrwxrwxrwx 1 root root  18 May 27  2016 S01bootlogs -> ../init.d/bootlogs
lrwxrwxrwx 1 root root  14 May 27  2016 S01motd -> ../init.d/motd
lrwxrwxrwx 1 root root  17 May 27  2016 S01rsyslog -> ../init.d/rsyslog
lrwxrwxrwx 1 root root  22 May 27  2016 S01triggerhappy -> ../init.d/triggerhappy
lrwxrwxrwx 1 root root  17 Dec 21 06:11 S02apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root  14 Dec 21 06:11 S03cron -> ../init.d/cron
lrwxrwxrwx 1 root root  14 Dec 21 06:11 S03dbus -> ../init.d/dbus
lrwxrwxrwx 1 root root  24 Dec 21 06:11 S03dphys-swapfile -> ../init.d/dphys-swapfile
lrwxrwxrwx 1 root root  18 Jan 20 06:46 S03myapp -> ../init.d/myapp
lrwxrwxrwx 1 root root  15 Dec 21 06:11 S03mysql -> ../init.d/mysql
lrwxrwxrwx 1 root root  13 Dec 21 06:11 S03ntp -> ../init.d/ntp
lrwxrwxrwx 1 root root  15 Dec 21 06:11 S03rsync -> ../init.d/rsync
lrwxrwxrwx 1 root root  13 Dec 21 06:11 S03ssh -> ../init.d/ssh
lrwxrwxrwx 1 root root  19 Aug 13  2016 S04bluetooth -> ../init.d/bluetooth
lrwxrwxrwx 1 root root  17 Aug 23  2016 S04postfix -> ../init.d/postfix
lrwxrwxrwx 1 root root  18 Dec 21 06:11 S05plymouth -> ../init.d/plymouth
lrwxrwxrwx 1 root root  18 Dec 21 06:11 S05rc.local -> ../init.d/rc.local
lrwxrwxrwx 1 root root  19 Dec 21 06:11 S05rmnologin -> ../init.d/rmnologin