Prometheus Blackbox Exporter

https://github.com/prometheus/blackbox_exporter

docker run --rm --network ip6net -p 9115:9115/tcp --name blackbox_exporter \
    -v `pwd`/config:/config \
    quay.io/prometheus/blackbox-exporter:latest \
    --config.file=/config/blackbox.yml

where config/blackbox.yml is:

modules:
  http_2xx:
    prober: http
    timeout: 5s
    http:
      preferred_ip_protocol: "ip4" # defaults to "ip6"
      ip_protocol_fallback: false  # no fallback to "ip6"
      fail_if_not_ssl: false
      fail_if_ssl: false
      follow_redirects: true
      tls_config:
        insecure_skip_verify: true
  http_post_2xx:
    prober: http
    timeout: 5s
    http:
      method: POST
      preferred_ip_protocol: "ip4"
      ip_protocol_fallback: false  # no fallback to "ip6"
  tcp_connect:
    prober: tcp
    timeout: 5s
    tcp:
      ip_protocol_fallback: false
      preferred_ip_protocol: ip4
      tls: false
  ssh_banner:
    prober: tcp
    timeout: 5s
    tcp:
      query_response:
      - expect: "^SSH-2.0-"
  icmp:
    prober: icmp
  icmp_ttl5:
    prober: icmp
    timeout: 5s
    icmp:
      ttl: 5
  dns_udp:
    prober: dns
    timeout: 5s
    dns:
      query_name: "www.prometheus.io"
      query_type: "A"
      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:
    prober: dns
    dns:
      transport_protocol: "tcp" # defaults to "udp"
      preferred_ip_protocol: "ip4" # defaults to "ip6"
      query_name: "www.prometheus.io"