``Summary of system administration tasks''
describes a number of practices
that can help you avoid system problems
and minimize the impact of system failures that happen.
A few of these points are summarized here:
Make an emergency boot floppy disk set
as discussed in
Chapter 5, ``Creating an emergency boot floppy disk set''.
If the root filesystem
or a critical booting file are corrupted
by a system crash,
the emergency boot floppy disk set
can be used to recover the system.
Otherwise, you may need to reinstall the software
before you will be able to boot the system.
Record your root disk information as described in
``Recording your root disk layout''.
This information is vital for restoring your system after a
root disk failure.
Monitor system performance, error logs,
and the system log book regularly.
This can enable you to correct problems
before they cause a hard failure.
See
``Checking system files with error histories''
for a list of useful error log files.
Install an uninterruptible power supply
(UPS) on the system
to protect the system from damage
during power surges and failures.
Back up the system regularly.
Consider running full system backups
every week or two.
Because incremental backups are
usually faster than full backups,
it is tempting to run full backups only rarely.
However, if you need to restore files,
you may need to restore
the most recent full backup
plus all incrementals run since then,
which could be a long and tedious process.
Understand the purpose of the ``override'' terminal
in dealing with the security subsystem.
The override terminal is used to correct errors
that prevent access to other terminals.
By default, the console multiscreen
(/dev/tty01) is the override terminal.
For more information, see
Chapter 10, ``Starting and stopping the system''.