MTD 248-645A Manual de usuario descargar pdf (Pagina 231)

Linux From Scratch - Version 7.0

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<lfs> needs to be replaced with the name given to the computer. Do not enter the Fully Qualified Domain Name

(FQDN) here. That information is put in the /etc/hosts file.

7.9. Configuring the setclock Script

The setclock script reads the time from the hardware clock, also known as the BIOS or the Complementary Metal

Oxide Semiconductor (CMOS) clock. If the hardware clock is set to UTC, this script will convert the hardware clock's

time to the local time using the /etc/localtime file (which tells the hwclock program which timezone the user is

in). There is no way to detect whether or not the hardware clock is set to UTC, so this needs to be configured manually.

The setclock is run via udev when the kernel detects the hardware capability upon boot. It can also be run manually

with the stop parameter to store the system time to the CMOS clock.

If you cannot remember whether or not the hardware clock is set to UTC, find out by running the hwclock --

localtime --show command. This will display what the current time is according to the hardware clock. If this

time matches whatever your watch says, then the hardware clock is set to local time. If the output from hwclock is

not local time, chances are it is set to UTC time. Verify this by adding or subtracting the proper amount of hours for

the timezone to the time shown by hwclock. For example, if you are currently in the MST timezone, which is also

known as GMT -0700, add seven hours to the local time.

Change the value of the UTC variable below to a value of 0 (zero) if the hardware clock is not set to UTC time.

Create a new file /etc/sysconfig/clock by running the following:

cat > /etc/sysconfig/clock << "EOF"

# Begin /etc/sysconfig/clock

UTC=1

# Set this to any options you might need to give to hwclock,

# such as machine hardware clock type for Alphas.

CLOCKPARAMS=

# End /etc/sysconfig/clock

EOF

A good hint explaining how to deal with time on LFS is available at http://www.linuxfromscratch.org/hints/

downloads/files/time.txt. It explains issues such as time zones, UTC, and the TZ environment variable.

Note

The CLOCKPARAMS and UTC paramaters may be alternatively set in the /etc/sysconfig/rc.

site file.

7.10. Configuring the Linux Console

This section discusses how to configure the console and consolelog bootscripts that set up the keyboard map, console

font and console kernel log level. If non-ASCII characters (e.g., the copyright sign, the British pound sign and Euro

symbol) will not be used and the keyboard is a U.S. one, much of this section can be skipped. Without the configuration

file, the console bootscript will do nothing.

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MTD 248-645A Manual de usuario Pagina 231