Red Hat NETWORK SATELLITE 5.1.0 - CHANNEL MANAGEMENT, Справочное руководство

Страница: 53 / 300

Red Hat Network Daemon
The Red Hat Network Daemon (
rhnsd
) periodically connects to Red Hat Network to check for
updates and notifications. The daemon, which runs in the background, is typically started from
the initialization scripts in
/etc/init.d/rhnsd
or
/etc/rc.d/init.d/rhnsd
.
To check for updates,
rhnsd
runs an external program called
rhn_check
located in
/usr/sbin/
. This is a small application that makes the network connection to RHN. The Red
Hat Network Daemon does not listen on any network ports or talk to the network directly. All
network activity is done via the
rhn_check
utility.
1. Configuring
The Red Hat Network Daemon can be configured by editing the
/etc/sysconfig/rhn/rhnsd
configuration file. This is actually the configuration file the
rhnsd
initialization script uses. The
most important setting offered by the daemon is its check-in frequency. The default interval time
is four hours (240 minutes). If you modify the configuration file, you must (as root) restart the
daemon with the command
service rhnsd restart
or
/etc/rc.d/init.d/rhnsd restart
.
Important
The minimum time interval allowed is one hour (60 minutes). If you set the
interval below one hour, it will default to four hours (240 minutes).
2. Viewing Status
You can view the status of the rhnsd by typing the command
service rhnsd status
or
/etc/rc.d/init.d/rhnsd status
at a shell prompt.
3. Disabling
To disable the daemon, (as root) run the ntsysv utility and uncheck rhnsd. You can also (as
root) execute the command
chkconfig rhnsd off
. Using these two methods only disables the
service the next time the system is started. To stop the service immediately, use the command
service rhnsd stop
or
/etc/rc.d/init.d/rhnsd stop
.
4. Troubleshooting
If you see messages indicating that checkins are not taking place, the RHN client on your
system is not successfully reaching Red Hat Network. Make certain:
• your client is configured correctly.
• your system can communicate with RHN via SSL (port 443). You may test this by running the
Chapter 3.
39