all: use dynamic host address and revise docker config

Author: changkun

cmd/code2img/main.go

@@ -57,10 +57,10 @@ func main() {
 			log.Printf("[%s]: write screenshot error %v", imgfile, err)
 			return
 		}
-		c.String(http.StatusOK, "https://golang.design/api/v1/code2img/data/images/"+id+".png")
+		c.String(http.StatusOK, "https://"+c.Request.Host+"/api/v1/code2img/data/images/"+id+".png")
 	})
 
-	s := &http.Server{Addr: ":8080", Handler: router}
+	s := &http.Server{Addr: ":80", Handler: router}
 	go func() {
 		if err := s.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 			log.Fatalf("listen: %s\n", err)

code2img

@@ -11,4 +11,5 @@ RUN apt update && apt install dumb-init
 ENTRYPOINT ["dumb-init", "--"]
 WORKDIR /app
 COPY . .
+EXPOSE 80
 CMD ["/app/code2img"]

docker/Dockerfile

@@ -13,5 +13,11 @@ services:
     image: code2img
     cap_add:
       - SYS_PTRACE # for debugging
-    ports:
-      - "5656:8080"
+    deploy:
+      replicas: 1
+    networks:
+      - traefik_proxy
+networks:
+  traefik_proxy:
+    external: true
+