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Chapter 8. Maintenance

• search.errata.advisory_score_threshold : minimum score an errata advisory result needs to be

returned back as a query result (.30)

• search.min_ngram : minimum length of n-gram characters. Note that any change to this value

requires clean-index to be run, and doc-indexes need to be modified and rebuilt) (1)

• search.max_ngram : maximum length of n-gram characters. Note that any change to this value

requires clean-index to be run, and doc-indexes need to be modified and rebuilt) (5)

• search.doc.limit_results : type true to limit the number of results both on search.score_threshold

and restrict max hits to be below search.max_hits_returned; type false means to return all

documentation search matches (false)

• search.schedule.interval : input the time in miliseconds to control the interval with which the

SearchServer polls the database for changes; the default is 5 minutes (300000).

• search.log.explain.results : used during development and debugging. If set to true, this will log

additional information showing what influences the score of each result. (false)

8.9. Automating Synchronization

Manually synchronizing the RHN Satellite repository with Red Hat Network can be a time-intensive

task. United States business hours tend to be the peak usage time for Red Hat Network, so

synchronization at that time may be slow. For these reasons, Red Hat encourages you to automate

synchronization at other times to better balance load and ensure quick synchronization. Continental

United States business hours are roughly 8:00 AM to 9:00 PM EST (UTC -5), due to four time zones,

Monday through Friday. These hours may vary seasonally by one hour. Further, Red Hat strongly

recommends that synchronization occur randomly for best performance.

This automation can be set easily by the addition of a simple cron job. To do this, edit the crontab as

root:

crontab -e

This opens the crontab in a text editor, by default Vi. Another editor can be used by first changing the

EDITOR variable, like so: export EDITOR=gedit.

Once opened, use the first five fields (minute, hour, day, month, and weekday) to schedule

the synchronization. Remember, hours use military time. Edit the crontab to include random

synchronization, like so:

0 1 * * * perl -le 'sleep rand 9000' && satellite-sync --email >/dev/null \

2>/dev/null

This particular job will run randomly between 1:00 a.m. and 3:30 a.m. system time each night and

redirect stdout and stderr from cron to prevent duplicating the more easily read message from

satellite-sync. Options other than --email can also be included. Refer to Table 6.2, “Satellite

Import/Sync Options” for the full list of options. Once you exit from the editor, the modified crontab is

installed immediately.

8.10. Implementing PAM Authentication

As security measures become increasingly complex, administrators must be given tools that simplify

their management. For this reason, RHN Satellite supports network-based authentication systems via

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Red Hat NETWORK - USER 3.0 Guía de instalación Pagina 78