Forum Discussion

stcavernelis's avatar
stcavernelis
Icon for Neophyte rankNeophyte
20 days ago

Ping with custom MTU size?

I have a requirement to ping a device from the collector but using a custom MTU, Does anyone have any suggestions on the best way to do this? My collectors are all Windows based.
stcavernelis's avatar
stcavernelis
Icon for Neophyte rankNeophyte
19 days ago

Thanks. I managed to get the following together which seems to work. I want to use it to monitor some remote devices. Thanks for the assistance!

import com.santaba.agent.groovyapi.expect.Expect;
import com.santaba.agent.groovyapi.snmp.Snmp;
import com.santaba.agent.groovyapi.http.*;
import com.santaba.agent.groovyapi.jmx.*;
import org.xbill.DNS.*;
import com.jcraft.jsch.JSch;
import com.santaba.agent.util.Settings;


hostname = hostProps.get("system.hostname")
//hostname = "www.google.com"
mymtu = hostProps.get("custom.ping.mtu")?.toInteger() ?: 1472
pingargs = '-n 4 -f -l $mymtu'
timeout = 15000 // timeout in milliseconds

try {

    def command_output = "ping ${hostname} ${pingargs}".execute().text
    //command_output = command_output.toString()
    //println command_output
        
    packetsSent = (((command_output.findAll(~/(?<=Sent = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    packetsReceived = (((command_output.findAll(~/(?<=Received = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    packetsLost = (((command_output.findAll(~/(?<=Lost = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    roundtripMinimum = (((command_output.findAll(~/(?<=Minimum = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    roundtripMaximum = (((command_output.findAll(~/(?<=Maximum = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    roundtripAverage = (((command_output.findAll(~/(?<=Average = )\d+/)).toString()).replaceAll(/\[(\d+)\]/, '$1')).toInteger()
    
    println 'packetsSent=' + packetsSent
    println 'packetsReceived=' + packetsReceived
    println 'packetsLost=' + packetsLost
    println 'roundtripMinimum=' + roundtripMinimum
    println 'roundtripMaximum=' + roundtripMaximum
    println 'roundtripAverage=' + roundtripAverage
        
    return 0
    }
    

catch (Exception e) {
    println "Unexpected Exception : " + e
    return 1
}

 

  • Stuart_Weenig's avatar
    Stuart_Weenig
    Icon for Legend rankLegend
    19 days ago

    FYI, you don't need any of those imports. You're not using any of them, so importing them is a waste of CPU cycles.

    • stcavernelis's avatar
      stcavernelis
      Icon for Neophyte rankNeophyte
      19 days ago

      Thanks for the tip, I didn't actually know that. 

      • Stuart_Weenig's avatar
        Stuart_Weenig
        Icon for Legend rankLegend
        18 days ago

        Yeah, whenever you start a new DS, the UI inserts all the most common imports at the beginning of the script, whether you need them or not. In almost every case, you only need one not the others. It would be actually helpful if LM could prompt you for how you need to collect data and start the script. For example, if you know you need to SSH into a device and execute a command, it would be nice for it to start with a script like this:

        import com.logicmonitor.common.sse.utils.GroovyScriptHelper as GSH
import com.logicmonitor.mod.Snippets

def azureHost = hostProps.get("auto.network.resolves") == "false" ? hostProps.get("system.azure.privateIpAddress") 
                                                                  : null
def loader = GSH.getInstance()._getScript("Snippets", Snippets.getLoader())
def remote = loader.load("lm.remote", "0").create(hostProps)
                                          .withHost(azureHost ?: hostProps.get("system.hostname"))
                                          .withTimeout(15000)

def debug = false // To run in debug mode, set to true

try {
    def command_output = remote.exec('echo YOUR COMMAND HERE')
    println(command_output)
    return 0
}
catch (Exception e) {println(e);return 1}

        This is the skeleton of most of LM's own Linux SSH scripts since they made a snippet that can be imported to do most of the tricky stuff. I'm sure the ME team has a bunch of monitoring recipes that can be used as starters for many scripted datasources. It would be nice if we could walk through a wizard that helps us find a template to get started with (or at least let us browse a repo through the UI and select a template to start with).

  • Stuart_Weenig's avatar
    Stuart_Weenig
    Icon for Legend rankLegend
    19 days ago

    Great that it's in Groovy. Makes it cross platform usable. I see now that you meant pinging devices that are already in LM (i thought you meant pinging devices outside LM). Looks like you should be able to use "custom.ping.mtu" as your AppliesTo. Is that what you're doing?