Configuring SSH153The rhnmd package can be found in the RHN Tools channel for all Red Hat Enterprise Linuxdistributions. To install it:1. Subscribe the systems to be monitored to the RHN Tools channel associated with the system.This can be done individually through the System Details Channels Software subtab or formultiple systems at once through the Channel Details Target Systems tab.2. Once subscribed, open the Channel Details Packages tab and find the rhnmd package (under'R').3. Click the package name to open the Package Details page. Go to the Target Systems tab, selectthe desired systems, and click Install Packages.4. Install the SSH public key on all client systems to be monitored, as described in Section 7.2.4,“Installing the SSH key”.5. Start the Red Hat Network Monitoring Daemon on all client systems using the command:service rhnmd start6. When adding probes requiring the daemon, accept the default values for RHNMD User andRHNMD Port: nocpulse and 4545, respectively.7.2.3. Configuring SSHIf you wish to avoid installing the Red Hat Network Monitoring Daemon and opening port 4545 onclient systems, you may configure sshd to provide the encrypted connection required between thesystems and RHN. This may be especially desirable if you already have sshd running. To configurethe daemon for monitoring use:1. Ensure the SSH package is installed on the systems to be monitored:rpm -qi openssh-server2. Identify the user to be associated with the daemon. This can be any user available on the system,as long as the required SSH key can be put in the user's ~/.ssh/authorized_keys file.3. Identify the port used by the daemon, as identified in its /etc/ssh/sshd_config configurationfile. The default is port 22.4. Install the SSH public key on all client systems to be monitored, as described in Section 7.2.4,“Installing the SSH key”.5. Start the sshd on all client systems using the command:service sshd start6. When adding probes requiring the daemon, insert the values derived from steps 2 and 3 in theRHNMD User and RHNMD Port fields.
