Refer to the Shell link. All your answers are there.
Many of the steps like generating a keytab, permissioning, etc are one time steps. Once you have an AD service account and its corresponding keytab (plus a krb5.conf file) you ar set to go. These steps are performed so you don't use a credential (or worse, a cleartext password) in your scripts.
The rest is just find a way to:
a) host your files (or have a repo)
b) retrieve the keytab+krb5 conf
c) Install CentrifyDC
d) kinit to the service account
e) run adjoin
f) cleanup
Otherwise if you want to use the ***definitely not recommended*** process all you need to do is:
$ sudo dpkg -i CentrifyDC-version.deb
$ sudo adjoin -w -c "ou=your, ou=location" -u your-username@domain.name -p your-cleartext-password-don't-do-it
your-username@domain.name should be able to "add computer objects" to the ou=your,ou=location OU in AD
R.P