Linux Network Traffic Monitoring

[naranant]

Hello,

Need help in setting up a monitoring a linux host along with the port number from nagios server and alert whenever it is not accessible. Below is the command need to use for monitoring. Please let me know the relevant nrpe command to use for monitoring this.

nc -vz hostname 9094

Regards..

[tgriep]

To check for an open port on a system, you can use the check_tcp plugin.

For your example, you would use the following to test for the port 9094 on the hostname.

Code: Select all

/usr/local/nagios/libexec/check_tcp -H hostname -p 9094

In the NRPE agent's config files, you would create a command like the following.

Code: Select all

command[check_tcp]=/usr/local/nagios/libexec/check_tcp -H $ARG1$

Then to use the NRPE command from the Nagios server, you would do this.

Code: Select all

/usr/local/nagios/libexec/check_nrpe -H NRPEHost -c check_tcp -a 'hostname -p 9094'

Let us know if you have any questions.

[naranant]

Hello,
I did the following steps.

command[check_tcp]=/usr/local/nagios/libexec/check_tcp -H $ARG1$ - This was updated the nrpe.cfg

Created a command in the nagios with below command

/usr/local/nagios/libexec/check_nrpe -H NRPEHost -c check_tcp -a 'hostname -p 9094'

and when i try to execute the commmand in the nagios server i get the attached error

[tgriep]

You have a typo in the command. The name of the plugin does not end in a number one "1" so remove that from the command.

[naranant]

Ok. i correct the command and getting the below message when i execute the command.


/usr/local/nagios/libexec/check_tcp -H lxxxv 9094
connect to address lxxxv and port 0: No route to host

How do i use the nc in the syntax as i have requirement to run the below command

nc -vz hostname 9094

[scottwilkerson]

You need to add the -p

Code: Select all

/usr/local/nagios/libexec/check_tcp -H lxxxv -p 9094

[naranant]

Hello Scott,

Sorry to miss that it works i see a response to continue on this how do i use nc(netcat) command along with this

[scottwilkerson]

Hello Scott,

Sorry to miss that it works i see a response to continue on this how do i use nc(netcat) command along with this

I don't understand how you want to use nc(netcat) with a check_tcp

nc is for sending data to a port, I'm not sure how you are going to get any response that can be used in a nagios check.

What is your desired output?

What would be a failure?

The check_tcp command should give you equal information as the -vz flag of nc