Initial commit

Author: wwwlde

.github/workflows/release.yml

@@ -0,0 +1,66 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    name: Build and Release
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        goos: [linux, darwin]
+        goarch: [amd64, arm64]
+        exclude:
+          - goos: darwin
+            goarch: arm64
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4  # Updated to v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5  # Updated to v5
+      with:
+        go-version: '^1.23'
+
+    - name: Build Go app
+      env:
+        GOOS: ${{ matrix.goos }}
+        GOARCH: ${{ matrix.goarch }}
+      run: |
+        CGO_ENABLED=0 go build -o ./dns-exporter-${{ matrix.goos }}-${{ matrix.goarch }} --ldflags '-w -s -extldflags "-static"' .
+
+    - name: List files
+      run: ls -lh
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4  # Updated to v4
+      with:
+        name: dns-exporter-${{ matrix.goos }}-${{ matrix.goarch }}
+        path: ./dns-exporter-${{ matrix.goos }}-${{ matrix.goarch }}
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4  # Updated to v4
+
+    - name: Download all artifacts
+      uses: actions/download-artifact@v4  # Updated to v4
+
+    - name: List all downloaded artifacts
+      run: ls -la
+
+    - name: Create GitHub Release
+      uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: |
+          ./dns-exporter-*/*
+      env:
+        GITHUB_TOKEN: ${{ secrets.RELEASE_GITHUB_TOKEN }}

.gitignore

@@ -0,0 +1,25 @@
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env

Dockerfile

@@ -0,0 +1,16 @@
+FROM golang:1.21.0 as builder
+
+WORKDIR /app
+
+COPY go.* /app
+COPY main.go /app
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o ./dns-exporter --ldflags '-extldflags "-static"' .
+
+FROM scratch as runner
+
+WORKDIR /app
+
+COPY --from=builder /app/dns-exporter .
+EXPOSE 8080
+ENTRYPOINT ["/app/dns-exporter"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Denys Lemeshko
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,74 @@
+# DNS Exporter for Prometheus
+
+## Overview
+DNS Exporter is a Prometheus exporter that queries DNS records and exposes metrics related to query performance and success status.
+
+This project was created as a result of issues with **pdnsd**, which caches DNS queries on hosts. The goal was to have a lightweight exporter to directly verify its operation on each server.
+
+## Features
+- Supports querying multiple DNS records
+- Configurable DNS server
+- Uses `miekg/dns` library for DNS resolution
+- Prometheus metrics for monitoring query time, success rate, and last check timestamp
+- Configurable worker pool for parallel querying
+- Graceful timeout handling for DNS requests
+
+## Installation
+
+### Prerequisites
+- Go 1.18+
+- Prometheus server
+
+### Build
+```sh
+# Clone the repository
+git clone https://github.com/wwwlde/dns-exporter.git
+cd dns-exporter
+
+# Build the binary
+go build -o ./dns-exporter --ldflags '-extldflags "-static"' .
+```
+
+### Run
+```sh
+./dns-exporter --config example.yaml --listen :8080 --timeout 1s --workers 5
+```
+
+## Configuration
+The exporter requires a YAML configuration file specifying the DNS queries:
+
+```yaml
+domains:
+  - domain: "example.com"
+    record_type: "A"
+  - domain: "example.org"
+    record_type: "MX"
+  - domain: "google.com"
+    record_type: "CNAME"
+dns_server: "127.0.0.1:53"
+```
+
+## Prometheus Metrics
+The exporter exposes the following metrics at `/metrics`:
+
+| Metric | Description |
+|--------|-------------|
+| `dnsexp_dns_query_time_seconds` | Time taken for the DNS query (seconds) |
+| `dnsexp_dns_query_success` | 1 if query was successful, 0 otherwise |
+| `dnsexp_dns_last_check_timestamp` | Timestamp of the last DNS query attempt |
+
+## Example Prometheus Configuration
+Add the following job to your `prometheus.yml`:
+
+```yaml
+scrape_configs:
+  - job_name: 'dns_exporter'
+    static_configs:
+      - targets: ['localhost:8080']
+```
+
+## License
+MIT License
+
+## Author
+Denys Lemeshko - [GitHub](https://github.com/wwwlde)

example.yaml

@@ -0,0 +1,9 @@
+---
+domains:
+  - domain: "example.com"
+    record_type: "A"
+  - domain: "google.com"
+    record_type: "MX"
+  - domain: "openai.com"
+    record_type: "A"
+dns_server: "127.0.0.1:53"

go.mod

@@ -0,0 +1,30 @@
+module dns-checker
+
+go 1.23.5
+
+require (
+	github.com/miekg/dns v1.1.63
+	github.com/prometheus/client_golang v1.20.5
+	github.com/sirupsen/logrus v1.9.3
+	github.com/spf13/cobra v1.8.1
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/mod v0.18.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/tools v0.22.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+)

go.sum

@@ -0,0 +1,67 @@
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