dockerizing

Dockerfile

@@ -0,0 +1,30 @@
+# Dockerfile References: https://docs.docker.com/engine/reference/builder/
+
+# Start from the latest golang base image
+FROM golang:latest as builder
+
+# Set the Current Working Directory inside the container
+WORKDIR /app
+
+# Copy go mod and sum files
+COPY src/* ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod download
+
+# Build the Go app
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .
+
+
+######## Start a new stage from scratch #######
+FROM alpine:latest  
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy the Pre-built binary file from the previous stage
+COPY --from=builder /app/main .
+
+# Command to run the executable
+CMD ["./main"] 

README.md

@@ -77,6 +77,15 @@ sudo systemctl enable mailrelay
 
 Now `mailrelay` runs as a service daemon and will automatically start after reboot.
 
+## Example 3 (Docker)
+
+edit mailrelay.json as needed then build container and run it
+
+```
+docker build  -t mailrelay .
+docker run -v $PWD/mailrelay.json:/etc/mailrelay.json mailrelay
+```
+
 ## Feedback
 
 Send any questions or comments to [email protected]

mailrelay.json

@@ -3,7 +3,7 @@
 	"smtp_port": 465,
 	"smtp_username": "[email protected]",
 	"smtp_password": "secret_app_password",
-	"local_listen_port": 2525,
-	"local_listen_ip": "0.0.0.0"
+	"local_listen_port": 25,
+	"local_listen_ip": "0.0.0.0",
 	"allowed_hosts": ["*"]
 }