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Thanks Eugeny,
It didn't work but it was enough information for me to find the answer with google.
What I actually had to do in Centos was:
service --add ajenti
They have pretty much replaced the whole init.rc system, and the update-rc.d command does not exist.
I tried a reboot after adding via the service command, and ajenti came up automatically.
Thanks
Customer support service by UserEcho
A correction...
I realized I had typed in the wrong command in my previous response.
It's actually:
chkconfig --add ajenti
The service command is used to turn it on or off from command line.
The chkconfig command is used to set up the runlevels where it is turned on automatically.
Sorry about that...if you are going to put it in the rpm you definitely want to have the right command!
Thanks