Exclude all of go from runtime image

Dockerfile

@@ -1,12 +1,18 @@
-FROM golang:1.22
+FROM golang:1.23 AS compile
 
 WORKDIR /usr/src/app
 
-# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
-# COPY go.mod go.sum ./
-# RUN go mod download && go mod verify
-
 COPY . .
-RUN go build -v -o /usr/local/bin/app ./...
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /app ./...
+
+FROM alpine:latest AS compressor
+RUN apk add --no-cache upx
+COPY --from=compile /app /app
+RUN upx --best /app
+
+FROM scratch AS service
+
+COPY --from=compile /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=compressor /app .
 
-CMD ["app"]
+ENTRYPOINT ["/app"]

README.md

@@ -1,5 +1,12 @@
 # Dynamic DNS Updates with Cloudflare
 
+> [!NOTE]
+> This program was originally written by [mxmlndml]. This fork merely
+> optimizes the docker image with better (more optimized) compiles flags
+> and strips out the entire Go runtime from the final image (making the final
+> image <3MB instead of ~900MB). Go thank him for his work developing this, not
+> me ;)
+
 ![cloudflare-dynamic-dns](https://github.com/mxmlndml/cloudflare-dynamic-dns/assets/42516330/fc6e7c3e-eb96-4fdf-924e-cf86dab70b4b)
 
 This Docker container offers a straightforward and efficient solution for
@@ -24,7 +31,7 @@ pulling the pre-built Docker container and running it with the necessary
 environment variables
 
 ```sh
-docker run -d -e API_KEY=123 -e ZONE_ID=023e105f4ecef8ad9ca31a8372d0c353 -e DOMAIN_NAMES=example.com,*.example.com mxmlndml/cloudflare-dynamic-dns
+docker run -d -e API_KEY=123 -e ZONE_ID=023e105f4ecef8ad9ca31a8372d0c353 -e DOMAIN_NAMES=example.com,*.example.com chaussebenjamin/cloudflare-dynamic-dns
 ```
 
 Alternatively you can copy the `docker-compose.yml` and `.env.template` from this repository into an
@@ -64,3 +71,5 @@ breakdown of the available configuration variables:
 - **`INTERVAL`** _defaults to `5`_
   \
   Time interval in minutes between DNS updates
+
+[1]: github.com/mxmlndml/cloudflare-dynamic-dns

docker-compose.yml

@@ -1,9 +1,10 @@
+---
 services:
   cloudflare-dynamic-dns:
-    image: mxmlndml/cloudflare-dynamic-dns:latest
+    image: chaussebenjamin/cloudflare-dynamic-dns:latest
     environment:
-      - "API_KEY=${API_KEY}"
-      - "ZONE_ID=${ZONE_ID}"
-      - "DOMAIN_NAMES=example.com,dyndns.example.com"
+      - API_KEY=${API_KEY}
+      - ZONE_ID=${ZONE_ID}
+      - DOMAIN_NAMES=example.com,dyndns.example.com
       # - "RECORD_TYPES=A"
       # - "INTERVAL=5"

main.go

@@ -1,13 +1,17 @@
 package main
 
 import (
+	_ "embed"
 	"fmt"
 	"log"
 	"strings"
 	"sync"
 	"time"
 )
 
+//go:embed title.txt
+var appNameASCII string
+
 type publicIP struct {
 	v4 string
 	v6 string
@@ -60,11 +64,7 @@ func getDNSRecords() []DNSRecords {
 }
 
 func initialize() {
-	fmt.Println("  _______             _______               ___                       _       ___  _  ______")
-	fmt.Println(" / ___/ /__  __ _____/ / _/ /__ ________   / _ \\__ _____  ___ ___ _  (_)___  / _ \\/ |/ / __/")
-	fmt.Println("/ /__/ / _ \\/ // / _  / _/ / _ `/ __/ -_) / // / // / _ \\/ _ `/  ' \\/ / __/ / // /    /\\ \\  ")
-	fmt.Println("\\___/_/\\___/\\_,_/\\_,_/_//_/\\_,_/_/  \\__/ /____/\\_, /_//_/\\_,_/_/_/_/_/\\__/ /____/_/|_/___/  ")
-	fmt.Println("                                              /___/                                         ")
+	fmt.Print(appNameASCII)
 
 	var recordType string
 	if UseIPv4() && UseIPv6() {

title.txt

@@ -0,0 +1,5 @@
+	  _______             _______               ___                       _       ___  _  ______
+	 / ___/ /__  __ _____/ / _/ /__ ________   / _ \__ _____  ___ ___ _  (_)___  / _ \/ |/ / __/
+	/ /__/ / _ \/ // / _  / _/ / _ `/ __/ -_) / // / // / _ \/ _ `/  ' \/ / __/ / // /    /\ \
+	\___/_/\___/\_,_/\_,_/_//_/\_,_/_/  \__/ /____/\_, /_//_/\_,_/_/_/_/_/\__/ /____/_/|_/___/
+	                                              /___/