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Chapter 7. Monitoring 161
Note
If valid entries already exist in
authorized_keys
, add the daemon key to the
file rather than replacing the existing key. To do so, save the copied text to
id_dsa.pub
in the same
.ssh/
directory and then run the following command:
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
.
5. Finally, ensure the
.ssh/
directory and
authorized_keys
file have the appro-
priate permissions set. This can be done as the daemon’s user with the following
commands:
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
Once the key is in place and accessible, all probes that require it should allow
ssh
con-
nections between the Monitoring infrastructure and the monitored system. You may then
schedule probes requiring the monitoring daemon to run against the newly configured sys-
tems.
7.3.
mysql-server
package
If your RHN Satellite Server will serve Monitoring-entitled client systems against which
you wish to run MySQL probes, you must configure the
mysql-server
package on the
RHN Satellite Server. Refer to Appendix C Probes for a listing of all available probes.
Subscribe the Satellite to the Red Hat Enterprise Linux AS Extras channel and install the
mysql-server
package either through the RHN website or via
up2date
.
Two additional packages will also be downloaded in the transaction. These are needed
for the
mysql-server
package to be installed and run successfully. Once finished, your
Satellite may be used to schedule MySQL probes.
7.4. Notifications
In addition to viewing probe status within the RHN interface, you may be notified when-
ever a probe changes state. This is especially important when monitoring mission-critical
production systems. For this reason, Red Hat recommends taking advantage of this feature.
To enable probe notifications within RHN, you must have identified a mail exchange server
and mail domain during installation of your RHN Satellite Server and configured sendmail
to properly handle incoming mail. Refer to the Installation chapter of the RHN Satellite
Server Installation Guide for details.