120 Chapter 7. MonitoringPlease note the Red Hat Network Monitoring Daemon requires monitored systems allow connectionson port 4545. You may avoid opening this port and installing the daemon altogether by using sshdinstead. Refer to Section 7.2.3 Configuring SSH for details.7.2.1. Probes requiring the daemonAn encrypted connection, either through the Red Hat Network Monitoring Daemon or sshd, is re-quired on client systems for the following probes to run. Note that all probes in the Linux group havethis requirement:• Linux::CPU Usage• Linux::Disk IO Throughput• Linux::Disk Usage• Linux::Inodes• Linux::Interface Traffic• Linux::Load• Linux::Memory Usage• Linux::Process Counts by State• Linux::Process Count Total• Linux::Process Health• Linux::Process Running• Linux::Swap Usage• Linux::TCP Connections by State• Linux::Users• Linux::Virtual Memory• LogAgent::Log Pattern Match• LogAgent::Log Size• Network Services::Remote Ping• Oracle::Client Connectivity• General::Remote Program• General::Remote Program with Data7.2.2. Installing the Red Hat Network Monitoring DaemonInstall the Red Hat Network Monitoring Daemon to prepare systems for monitoring using the probesidentified in Section 7.2.1 Probes requiring the daemon. Note that the steps in this section are optionalif you intend to use sshd to allow secure connections between the RHN monitoring infrastructure andthe monitored systems. Refer to Section 7.2.3 Configuring SSH for instructions.The rhnmd package can be found in the RHN Tools channel for all Red Hat Enterprise Linux distri-butions. To install it:1. Subscribe the systems to be monitored to the RHN Tools channel associated with the system,if they already aren’t. This can be done individually through the System Details , Channels,Software subtab or to multiple systems at once through the Channel Details , TargetSystems tab.
