To upgrade FreeBSD 7.2 to FreeBSD 8 using csup, you will need to follow these steps:
Install csup:
csup is not installed by default on FreeBSD systems. To install it, you will need to run the following command:
pkg install csup
Create a supfile:
csup uses a configuration file called a supfile to specify the sources of the update. To create a supfile, you will need to create a new file in the /etc directory with the following content:
*default host=cvsup.freebsd.org *default base=/usr *default prefix=/usr *default release=cvs tag=RELENG_8 *default delete use-rel-suffix src-all
This supfile specifies the cvsup.freebsd.org server as the source of the update, and the RELENG_8 tag as the target release.
Run csup:
Run the csup command with the supfile as the argument. For example:
csup /etc/supfile
This will start the update process, which may take some time depending on the speed of your internet connection and the size of the update.
Upgrade the system:
After csup has completed downloading the updates, you will need to run the freebsd-update .