Red Hat NETWORK 3.7 Reference Manual

Also see for NETWORK 3.7 -: Manual Configuration guide

Contents

Red Hat NETWORK 3.7 Reference Manual Manual pdf 133 page image

Chapter 7. Monitoring 1212. Once subscribed, open the Channel Details - Packages tab and find the rhnmd package (un-der ’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 7.2.4Installing 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 ssh2. 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 configura-tion file. The default is port 22.4. Install the SSH public key on all client systems to be monitored, as described in Section 7.2.4Installing 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.7.2.4. Installing the SSH keyWhether you use rhnmd or sshd, you must install the Red Hat Network Monitoring Daemon publicSSH key on the systems to be monitored to complete the secure connection. To install it:1. In the RHN website, navigate to the Monitoring - Scout Config Push page and click the nameof the RHN Server that will monitor the client system. The SSH id_dsa.pub key is visible onthe resulting page.2. Copy the character string (beginning with ssh-dss and ending with the hostname of the RHNServer).3. On the command line of the system to be monitored, switch to the user aligned with the daemon.This is accomplished for rhnmd with the command:su - nocpulse4. Paste the key character string into the ~/.ssh/authorized_keys file for the daemon’s user.For rhnmd, this is /opt/nocpulse/.ssh/authorized_keys.