The /etc/init.d directory defines the services that run at boot-time. So second question - How do you control the boot order init.d scripts in a. Wrong service startup order when not booting into single-user mode . Share a link to this question via email, Google+, Twitter, or Facebook. You can change the order by renaming the symlinks under /etc/rcX.d/ . Browse other questions tagged linux centos redhat boot service or ask.