Can't get Blackbox Exporter TCP probe to return value of 1

Exporters and Metrics
1

Hi. I’m looking to probe a simple Iperf3 server with Blackbox Exporter, TCP probe. But as it’s currently configured, I can’t get it to return a query value of “1”, it returns “0” instead.

This is my blackbox.yml:

modules:
  http_2xx:
    prober: http
    http:
      method: GET
  http_post_2xx:
    prober: http
    http:
      method: POST
  tcp_connect:
    prober: tcp
    timeout: 5s
  pop3s_banner:
    prober: tcp
    tcp:
      query_response:
      - expect: "^+OK"
      tls: true
      tls_config:
        insecure_skip_verify: false
  ssh_banner:
    prober: tcp
    tcp:
      query_response:
      - expect: "^SSH-2.0-"
  icmp:
    prober: icmp

I’m using the module tcp_connect , and I imagine I need to add something to this module to get it to return a value of “1”, but I’m not sure how.

Can anyone help with a working module config for a simple TCP probe?

Thanks.

2

For some very strange reason, I can’t edit my post. So here is some more info:

My Prometheus.yml : (Blackbox job under scrape configs)

  - job_name: 'blackbox-tcp'
    scrape_interval: 60s
    metrics_path: /probe
    params:
      module: [tcp_connect]  # Look for TCP response
    static_configs:
      - targets:
        - http://10.10.2.2:5201       # Iperf3 server
        - http://10.10.2.4:9201       # Portainer agent
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 10.10.2.4:9095  # The blackbox exporter's real hostname:port.

All my HTTP endpoints are working fine and all endpoints are up. In addition, I can connect to the Iperf3 server on 10.10.2.2:5201 with Telnet to confirm it’s running.

x1RG7
x1RG71922×1033 63.4 KB

But Blackbox exporter still returns a value of “0” in the query. Any ideas?

3

Of course the TCP targets should not be prefixed with http://. When I made this change, everything worked.

- job_name: 'blackbox-tcp'
    scrape_interval: 60s
    metrics_path: /probe
    params:
      module: [tcp_connect]  # Look for TCP response
    static_configs:
      - targets:
        - 10.10.2.2:5201       # Iperf3 server
        - 10.10.2.4:9201       # Portainer agent
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 10.10.2.4:9095  # The blackbox exporter's real hostname:port.
4

Hi,

I am facing similar issue, I tried removing http but probe is still returning 0

here is the module definition that I am using:

    http_eid_errorcode:
      prober: http
      timeout: 5s
      http:
        preferred_ip_protocol: "ip4"
        valid_http_versions: ["HTTP/1.1", "HTTP/2"]
        ip_protocol_fallback: true
        fail_if_not_ssl: true
        fail_if_body_not_matches_regexp:
          - "[\\S\\s]*(</transid>)[\\S\\s]*?(<errorcode>)(0|62)[\\S\\s]*"
          - "[\\S\\s]*(</element>)[\\S\\s]*?(<errorcode>)(0|62)[\\S\\s]*"
      tcp:
        ip_protocol_fallback: true
      dns:
        ip_protocol_fallback: true
        query_name: "eid_errorcode"
      icmp:
        ip_protocol_fallback: true