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Custom Probe Methods

In this page, we will explain how to configure custom probe methods in an existing Blackbox ConfigMap. We will use the HTTP probe method as an example to demonstrate how to modify the ConfigMap to achieve custom HTTP probing.

Procedure

  1. Go to the cluster list in Container Management and enter the details of the target cluster.
  2. Click the left navigation bar and select ConfigMaps & Secrets -> ConfigMaps .

  3. Find the ConfigMap named insight-agent-prometheus-blackbox-exporter and click Edit YAML .

    Add custom probe methods under modules . Here we use the HTTP probe method as an example:

    module:
  http_2xx:
    prober: http
    timeout: 5s
    http:
      valid_http_versions: [HTTP/1.1, HTTP/2]
      valid_status_codes: []  # Defaults to 2xx
      method: GET

Info

For more probe methods, refer to blackbox_exporter Configuration.

Friendly Reference

The following YAML file contains various probe methods such as HTTP, TCP, SMTP, ICMP, and DNS. You can modify the configuration file of insight-agent-prometheus-blackbox-exporter according to your needs.

Click to view the complete YAML file 
kind: ConfigMap
apiVersion: v1
metadata:
  name: insight-agent-prometheus-blackbox-exporter
  namespace: insight-system
  labels:
    app.kubernetes.io/instance: insight-agent
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: prometheus-blackbox-exporter
    app.kubernetes.io/version: v0.24.0
    helm.sh/chart: prometheus-blackbox-exporter-8.8.0
  annotations:
    meta.helm.sh/release-name: insight-agent
    meta.helm.sh/release-namespace: insight-system
data:
  blackbox.yaml: |
    modules:
      HTTP_GET:
        prober: http
        timeout: 5s
        http:
          method: GET
          valid_http_versions: ["HTTP/1.1", "HTTP/2.0"]
          follow_redirects: true
          preferred_ip_protocol: "ip4"
      HTTP_POST:
        prober: http
        timeout: 5s
        http:
          method: POST
          body_size_limit: 1MB
      TCP:
        prober: tcp
        timeout: 5s
      ICMP:
        prober: icmp
        timeout: 5s
        icmp:
          preferred_ip_protocol: ip4
      SSH:
        prober: tcp
        timeout: 5s
        tcp:
          query_response:
          - expect: "^SSH-2.0-"
      POP3S:
        prober: tcp
        tcp:
          query_response:
          - expect: "^+OK"
          tls: true
          tls_config:
            insecure_skip_verify: false
      http_2xx_example:               # http probe example
        prober: http
        timeout: 5s                   # probe timeout
        http:
          valid_http_versions: ["HTTP/1.1", "HTTP/2.0"]                   # Version in the response, usually default
          valid_status_codes: []  # Defaults to 2xx                       # Valid range of response codes, probe successful if within this range
          method: GET                 # request method
          headers:                    # request headers
            Host: vhost.example.com
            Accept-Language: en-US
            Origin: example.com
          no_follow_redirects: false  # allow redirects
          fail_if_ssl: false   
          fail_if_not_ssl: false
          fail_if_body_matches_regexp:
            - "Could not connect to database"
          fail_if_body_not_matches_regexp:
            - "Download the latest version here"
          fail_if_header_matches: # Verifies that no cookies are set
            - header: Set-Cookie
              allow_missing: true
              regexp: '.*'
          fail_if_header_not_matches:
            - header: Access-Control-Allow-Origin
              regexp: '(\*|example\.com)'
          tls_config:                  # tls configuration for https requests
            insecure_skip_verify: false
          preferred_ip_protocol: "ip4" # defaults to "ip6"                 # Preferred IP protocol version
          ip_protocol_fallback: false  # no fallback to "ip6"            
      http_post_2xx:                   # http probe example with body
        prober: http
        timeout: 5s
        http:
          method: POST                 # probe request method
          headers:
            Content-Type: application/json
          body: '{"username":"admin","password":"123456"}'                   # body carried during probe
      http_basic_auth_example:         # probe example with username and password
        prober: http
        timeout: 5s
        http:
          method: POST
          headers:
            Host: "login.example.com"
          basic_auth:                  # username and password to be added during probe
            username: "username"
            password: "mysecret"
      http_custom_ca_example:
        prober: http
        http:
          method: GET
          tls_config:                  # root certificate used during probe
            ca_file: "/certs/my_cert.crt"
      http_gzip:
        prober: http
        http:
          method: GET
          compression: gzip            # compression method used during probe
      http_gzip_with_accept_encoding:
        prober: http
        http:
          method: GET
          compression: gzip
          headers:
            Accept-Encoding: gzip
      tls_connect:                     # TCP probe example
        prober: tcp
        timeout: 5s
        tcp:
          tls: true                    # use TLS
      tcp_connect_example:
        prober: tcp
        timeout: 5s
      imap_starttls:                   # IMAP email server probe configuration example
        prober: tcp
        timeout: 5s
        tcp:
          query_response:
            - expect: "OK.*STARTTLS"
            - send: ". STARTTLS"
            - expect: "OK"
            - starttls: true
            - send: ". capability"
            - expect: "CAPABILITY IMAP4rev1"
      smtp_starttls:                   # SMTP email server probe configuration example
        prober: tcp
        timeout: 5s
        tcp:
          query_response:
            - expect: "^220 ([^ ]+) ESMTP (.+)$"
            - send: "EHLO prober\r"
            - expect: "^250-STARTTLS"
            - send: "STARTTLS\r"
            - expect: "^220"
            - starttls: true
            - send: "EHLO prober\r"
            - expect: "^250-AUTH"
            - send: "QUIT\r"
      irc_banner_example:
        prober: tcp
        timeout: 5s
        tcp:
          query_response:
            - send: "NICK prober"
            - send: "USER prober prober prober :prober"
            - expect: "PING :([^ ]+)"
              send: "PONG ${1}"
            - expect: "^:[^ ]+ 001"
      icmp_example:                    # ICMP probe configuration example
        prober: icmp
        timeout: 5s
        icmp:
          preferred_ip_protocol: "ip4"
          source_ip_address: "127.0.0.1"
      dns_udp_example:                 # DNS query example using UDP
        prober: dns
        timeout: 5s
        dns:
          query_name: "www.prometheus.io"                 # domain name to resolve
          query_type: "A"              # type corresponding to this domain
          valid_rcodes:
          - NOERROR
          validate_answer_rrs:
            fail_if_matches_regexp:
            - ".*127.0.0.1"
            fail_if_all_match_regexp:
            - ".*127.0.0.1"
            fail_if_not_matches_regexp:
            - "www.prometheus.io.\t300\tIN\tA\t127.0.0.1"
            fail_if_none_matches_regexp:
            - "127.0.0.1"
          validate_authority_rrs:
            fail_if_matches_regexp:
            - ".*127.0.0.1"
          validate_additional_rrs:
            fail_if_matches_regexp:
            - ".*127.0.0.1"
      dns_soa:
        prober: dns
        dns:
          query_name: "prometheus.io"
          query_type: "SOA"
      dns_tcp_example:               # DNS query example using TCP
        prober: dns
        dns:
          transport_protocol: "tcp" # defaults to "udp"
          preferred_ip_protocol: "ip4" # defaults to "ip6"
          query_name: "www.prometheus.io"

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