Maybe you have tried to execute the top command to monitor processes on a remote host.
Error remotely – Run it in batch mode
If so, the following error can be returned:
$ ssh user@remotehost top -n1
TERM environment variable not set.
top does not work remotely in the default “interactive” mode. Use the “-b” parameter to run it in … Read more
When suffering random network interruptions, a possible cause (and diffcult to find) is our firewall ARP table overflow. In Checkpoint systems, the Linux kernel Gaia is based on would log messages like "kernel: neighbour table overflow" to /var/log/messages.
After living two small crisis due to this problem (network scanning software and mask B networks are dangerous for the … Read more
Having our Checkpoint VSX Virtual System active connections under control can be very important to avoid problems, configure a higher connection limit, be ready for growth (and so scalate our environment)…
Nagios and SNMP can be used to configure a VS connection monitor plugin:
Steps needed to configure the plugin:
SNMP OID for virtual systems active connections
Develop an script
… Read more
This post shows a Powershell script I use to monitor the status of my Exchange mailbox database copies and raises a critical alert if any of them is not "Mounted" or "Healthy".
The script takes advantage of the Nagios passive checks and the configurations shown on my previous post "Nagios – Using passive checks without agent".
Here is … Read more