1. Check the boot from Kai items
centos7 from the start chkconfig item has not changed:
systemctl List-Unit-Files
left the service name, the right is the state, enabled a boot, disabled is the boot does not start.
Of course, you can also filter such as: View startup items
systemctl list-unit-files | grep enable
2. Set the boot from Kai items
systemctl enable Redis
systemctl enable nginx.service
Start nginx
systemctl Start nginx.service
End nginx
systemctl STOP nginx.service
Restart nginx
systemctl restart nginx.service