Analyzer ngx-dump-dns

# Name

ngx-dump-dns - Dump Nginx DNS configuration and domain caches

This analyzer extracts DNS configuration and cached domain resolution data from Nginx-based web servers including OpenResty and Kong. It captures DNS resolver settings and domain name cache entries, presenting the information in tabular format. The analyzer helps troubleshoot DNS resolution issues, verify DNS configuration correctness, and inspect cached DNS records for debugging upstream connection problems.

# Resource Category

Network I/O.

# Application Type & Technical Stack

• OpenResty
• Kong
• APISIX

# Command Line Syntax

The analyzer can be invoked directly on the command-line via the orxray utility from the openresty-xray-cli software package.

Alternatively, the analyzer can also be invoked manually or automatically on the web console UI of OpenResty XRay (like on the Advanced web page).

# PID is the target process PID.
orxray analyzer run ngx-dump-dns -p PID

# trace a shell command directly
orxray analyzer run ngx-dump-dns -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run ngx-dump-dns -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run ngx-dump-dns --exe /path/to/exe/file

# Tracing Multiple Processes

Supported.

# Output Formats

• Tables
• Plain Texts

# Output Example

[
  {
      "title": "Nginx DNS configuration and caches",
      "type": "table",
      "ver": 1,
      "data": [
          [
              "Resource",
              "Value"
          ],
          [
              "DNS server",
              "172.31.0.2:53"
          ]
      ]
  }
]

# Author

The OpenResty Inc. Team.

# Copyright

Copyright (C) by OpenResty Inc. All rights reserved.