Start systemd/init level services sequentially

servant.sh

#!/bin/sh

# Start all system services sequentially

wants=$(systemctl show -p Wants multi-user.target | sed 's/^Wants=//' | tr ' ' '\n' | sort)
log=/var/tmp/multi-user-steps-$(date +%Y%m%d-%H%M%S)

log () {
  echo "$* ..." | tee -a "$log"
  sync
  "$@"
  ret=$?
  echo "$* -> $ret" | tee -a "$log"
  sync
  return $ret
}

# systemd services
for service in $wants; do
  log systemctl start $service
  sleep 2
done

# up start services
for conf in /etc/init/*.conf; do
  service=${conf##*/}; service=${service%.conf}
  log service ${service} start
  sleep 2
done

# init level 3 services
for service in /etc/rc3.d/S*; do
  log ${service} start
  sleep 2
done