Installation guide

Chapter 3. Boot Process, Init, and Shutdown 65
3.7.1.5. /etc/sysconfig/clock
The /etc/sysconfig/clock file controls the interpretation of values read from the system clock.
Earlier releases of Red Hat Linux used the following values (which are deprecated):
• CLOCKMODE=
value , where value is one of the following:
• GMT — Indicates that the clock is set to Universal Time (Greenwich Mean Time).
• ARC — Indicates the ARC console’s 42-year time offset is in effect (for Alpha-based systems
only).
Currently, the correct values are:
• UTC=
value , where value is one of the following boolean values:
• true — Indicates that the clock is set to Universal Time. Any other value indicates that it is set
to local time.
• ARC=
value , where value is the following:
• true — Indicates the ARC console’s 42-year time offset is in effect. Any other value indicates
that the normal UNIX epoch is assumed (for Alpha-based systems only).
• ZONE=
filename — Indicates the timezone file under /usr/share/zoneinfo that
/etc/localtime is a copy of, such as:
ZONE="America/New York"
3.7.1.6. /etc/sysconfig/desktop
The /etc/sysconfig/desktop file specifies the desktop manager to be run, such as:
DESKTOP="GNOME"
3.7.1.7. /etc/sysconfig/dhcpd
The /etc/sysconfig/dhcpd file is used to pass arguments to the dhcpd daemon at boot time.
The dhcpd daemon implements the Dynamic Host Configuration Protocol (DHCP) and the Internet
Bootstrap Protocol (BOOTP). DHCP and BOOTP assign hostnames to machines on the network. For
more information about what parameters you can use in this file, type man dhcpd.
3.7.1.8. /etc/sysconfig/firstboot
Beginning with Red Hat Linux 8.0, the first time you boot the system, the /sbin/init program calls
the etc/rc.d/init.d/firstboot script. This allows the user to install additional applications and
documentation before the boot process completes.
The /etc/sysconfig/firstboot file tells the firstboot command not to run on subsequent
reboots. If you want firstboot to run the next time you boot the system, simply remove
/etc/sysconfig/firstboot and execute chkconfig --level 5 firstboot on.