I’ve been using the free Solar Winds Exchange monitoring tool to keep an eye on my Exchange 2003 backend. Solarwinds has released a free tool to monitor ESX servers. Note this free tool will only monitor one server – if you want the full deal you have to pay for the monitoring suite. These instructions will get you started with the free tool.
2. Install it in your Windows workstation.
3. SSH or console into your ESX server as root, or equivalent.
4. type nano /etc/snmp/snmpd.conf to open the configuration for editing.
5. make sure there is a statement that says rocommunity public, if not add it. Otherwise close.
6. at the command line type: chkconfig snmpd on t (to make the service start automatically)
7. Restart the snmpd service: service snmpd restart
8, open your ESX firewall for snmp port 161 UDP and TCP by entering the following:
esxcfg-firewall -o 161,tcp,in,snmp
esxcfg-firewall -o 161,udp,in,snmp
Now open up your Solar Winds monitor and enter the name of the ESX server. The defaults should work fine unless you changed the public string name to something else.