Unable to graph my own bash script using cacti

[khalilmeb]

Hello

I have the following output of running SNMPstat which is

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 snmpnetstat -v2c -c public -Cs -Cp udp 172.0.1.11 

The output of the command is:

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udp:
           198 total datagrams received
            65 datagrams to invalid port
             0 datagrams dropped due to errors
           265 output datagram requests

I know that the Data input methods with more than one output field are handled a bit differently when writing scripts. Scripts that output more than one value should be formatted like the following:

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<fieldname_1>:<value_1> <fieldname_2>:<value_2> ... <fieldname_n>:<value_n>

Therefore, I have written the *bash script* and it returns exactly the output I want when I run for example `

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./udp_netstat.sh 172.0.1.11

` returns

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Received Datagrams:258 Invalid port:63 Dropped datagrams:0 Datagram requests:471520

Here is the content of the bash file

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$ cat udp_netstat.sh
    #!/bin/bash
    
    rs="$(snmpnetstat -v2c -c public -Cs -Cp udp "$@")"
        # You have to quote "$rs" so newlines don't break
        ReceivedDatagrams="$(echo "$rs" | cut -d$'\n' -f2 | tr -s ' '| cut -d' ' -f2)"
        InvalidPort="$(echo "$rs" | cut -d$'\n' -f3 | tr -s ' '| cut -d' ' -f2)"
        DroppedDatagrams="$(echo "$rs" | cut -d$'\n' -f4 | tr -s ' '| cut -d' ' -f2)"
        DatagramRequests="$(echo "$rs" | cut -d$'\n' -f5 | tr -s ' '| cut -d' ' -f2)"

the value `"$@"` is for the hostname device for cacti

Starting with a data input method, I gave the following path `/usr/share/cacti/site/scripts/udp_netstat <hostname>` then I added the input fields as well as the output, according to the bash file output.

For the Data Source, I added data source items also according to the bash file output and made Data source type as COUNTER. Then, I proceed to Graph Template where I added the line of each output I have.

Here is the steps and some screenshots:



It seems to be in the workflow of adding a new script, however, nothing so far is shown in the graph.

Input Data Source


Data Template


Graph Template


I assume there is a mistake with the Input String.


Thank you

[netniV]

You'll find examples in the cacti scripts folder already. That's where I learnt how to do it.

I have collaborated on scripts with various companies though I usually charge for that time because when writing a custom script, its also the maintenance and support of it when they want more or something stops working (like the output from the sub process changes).

I think Thomas Urban's cacti book also documents in some basic ways how to handle this, but I couldn't be sure without digging out a copy.

[khalilmeb]

You'll find examples in the cacti scripts folder already. That's where I learnt how to do it.

I have collaborated on scripts with various companies though I usually charge for that time because when writing a custom script, its also the maintenance and support of it when they want more or something stops working (like the output from the sub process changes).

I think Thomas Urban's cacti book also documents in some basic ways how to handle this, but I couldn't be sure without digging out a copy.

I have edit my post. Could you please check it?

[netniV]

Try changing your field names so that they don't have spaces.

[khalilmeb]

Try changing your field names so that they don't have spaces.

I think I have given the correct names where don't have any spaces. Except for the friendly names, don't you think so?

[netniV]

Your screenshot of the script output does not match up with the names on the data query from what I saw ...

[khalilmeb]

Your screenshot of the script output does not match up with the names on the data query from what I saw ...

Well, this is the script I use:

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#!/bin/bash
rs="$(snmpnetstat -v2c -c public -Cs -Cp udp "$@")"
ReceivedDatagrams=$(echo $rs | cut -d"/" -f1)
InvalidPort=$(echo $rs | cut -d"/" -f2)
DroppedDatagrams=$(echo $rs | cut -d"/" -f3)
DatagramRequests=$(echo $rs | cut -d"/" -f4)
    
echo "Received Datagrams:$ReceivedDatagrams Invalid port:$InvalidPort Dropped datagrams:$DroppedDatagrams Datagram requests:$DatagramRequests"

the value "$@" is for the hostname device for cacti

The output of bash script is:

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ReceivedDatagrams:258 InvalidPort:63 DroppedDatagrams:0 DatagramRequests:471520

I don't see why It is not working

[netniV]

Well, your post does not add up. You have spaces in your echo statement that are not in your output.

[khalilmeb]

Well, your post does not add up. You have spaces in your echo statement that are not in your output.

How to fix this issue? I actually don't get it how I fix the space thing. Could you please write me down the correct echo?

[camerabob]

Change:

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echo "Received Datagrams:$ReceivedDatagrams Invalid port:$InvalidPort Dropped datagrams:$DroppedDatagrams Datagram requests:$DatagramRequests"

to

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echo "Received_Datagrams:$ReceivedDatagrams_Invalid port:$InvalidPort Dropped_datagrams:$DroppedDatagrams Datagram_requests:$DatagramRequests"

The output should now present as:

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Received_Datagrams:258 Invalid_Port:63 Dropped_Datagrams:0 Datagram_Requests:471520

Make the same " " to underscore changes in Cacti and the data should sync. Or you could just remove those spaces altogether.

[netniV]

Thanks Bob for the examples. Personally, I would use camel case with only alphanumeric characters to avoid any issues. There should only be a space between the value and the next fieldname.