Blackbox Exporter and ICMP

[dya...@gmail.com]

Hi,

I'm having trouble configuring the blackbox exporter for a simple task, ping response times. I have replaced a Cacti installation monitoring 25 server nodes with minimal difficulty. I just need a base example to ping a single node, so I can figure the rest out. I don't know what I'm missing, as I have been able to use the blackbox exporter to monitor my https API endpoints, and my websites.

The server nodes are all in the 192.168.1.0/24 subnet.

Thanks,

David

[Julius Volz]

In the blackbox_exporter.yml you'll just need:

-------------------------

modules:

  icmp:

    prober: icmp

    timeout: 5s

-------------------------

Then in your prometheus.yml, something like this in your scrape config:

-------------------------

  - job_name: 'blackbox'

    metrics_path: /probe

    params:

      module: [icmp]

    static_configs:

      - targets:

        - google.com

        - twitter.com

    relabel_configs:

      - source_labels: [__address__]

        target_label: __param_target

      - source_labels: [__address__]

        target_label: instance

      - source_labels: []

        target_label: __address__

        replacement: 127.0.0.1:9115  # Blackbox exporter.

-------------------------

That will give you a metric "probe_duration_seconds", which tells you the latency of the last probe (from the view of the blackbox exporter).

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[dya...@gmail.com]

That's almost what I have now. After following the notes found on github (https://github.com/prometheus/blackbox_exporter/issues/70) I was able to get the Blackbox_exporter working.

One stupid question, when I query probe_ip_protocol for the ping probes, I comes back with protocol 4 (TCP), not protocol 2 (ICMP).

This is my blackbox.yml:

modules:

  ping:

    prober: icmp

    timeout: 5s

    icmp:

      protocol: "icmp"

      preferred_ip_protocol: "ip4"

And the relevant snippit from prometheus.yml

scrape_configs:

  - job_name: 'ping'

    metrics_path: /probe

    params:

      module: [ping]

    static_configs:

      - targets: ['gizmo','donald','daisy']

    relabel_configs:

      # Set the target's address as the target-GET-parameter for the blackbox exporter

      - source_labels: [__address__]

        regex: (.*)

        target_label: __param_target

        replacement: ${1}

      # Set the target's address as the instance name

      - source_labels: [__address__]

        regex: (.*)

        target_label: instance

        replacement: ${1}

      # Set the scrape address to the blackbox exporter

      - source_labels: []

        regex: .*

        target_label: __address__

        replacement: gizmo:9115

Is the returned protocol '4' because of the transfer from the blackbox exporter back to prometheus or does it have to do with my configuration?

Thanks!

David

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[Julius Volz]

As the option 'preferred_ip_protocol: "ip4"' in your config files hints at, this is not the protocol of the payload of the IP packet, but the version of the IP protocol itself (IPv4 / IPv6).

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[manfred...@googlemail.com]

Hello

I am wondering. In my case I get this log in the Blackbox-Exporter:

Logs for the probe:
ts=2018-11-25T09:47:31.825547649Z caller=main.go:116 module=icmp target=twitter.com level=info msg="Beginning probe" probe=icmp timeout_seconds=4.5
ts=2018-11-25T09:47:31.825703591Z caller=utils.go:42 module=icmp target=twitter.com level=info msg="Resolving target address" preferred_ip_protocol=ip4
ts=2018-11-25T09:47:31.82689422Z caller=utils.go:65 module=icmp target=twitter.com level=info msg="Resolved target address" ip=104.244.42.129
ts=2018-11-25T09:47:31.826964068Z caller=icmp.go:61 module=icmp target=twitter.com level=info msg="Creating socket"
ts=2018-11-25T09:47:31.827022821Z caller=icmp.go:78 module=icmp target=twitter.com level=error msg="Error listening to socket" err="listen ip4:icmp 0.0.0.0: socket: operation not permitted"
ts=2018-11-25T09:47:31.827067894Z caller=main.go:129 module=icmp target=twitter.com level=error msg="Probe failed" duration_seconds=0.001429711

On the terminal I get the Ping:

# ping twitter.com
PING twitter.com (104.244.42.65) 56(84) bytes of data.
64 bytes from twitter.com (104.244.42.65): icmp_seq=1 ttl=56 time=33.6 ms
64 bytes from twitter.com (104.244.42.65): icmp_seq=2 ttl=56 time=43.6 ms

What is going wrong?

Thanks in advance

Manfred

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[Ben Kochie]

Normal ICMP requires extra privileges to be used.  Your ping binary probably has these.

sudo setcap cap_net_raw=+ep blackbox_exporter

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[Manfred Gnaedig]

Thanks for the tip!

Now it works like expected ;-)