Fully working!

...but docker can't write to /etc/hosts file... AARGH!

Cargo.toml

@@ -3,6 +3,10 @@ name = "docker-vhoster"
 version = "0.1.0"
 edition = "2021"
 
+# [package.release]
+# opt-level = 's'  # Optimize for size.
+# lto = true # Link Time Optimization (LTO)
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
@@ -12,3 +16,5 @@ serde = { version = "1.0", features = ["derive"] }
 tokio = { version = "1", features = ["full"] }
 chrono = "0.4"
 futures-util = "0.3"
+futures-retry = "0.6.0"
+ctrlc = { version = "3.0", features = ["termination"] }

Dockerfile

@@ -1,19 +1,23 @@
 FROM rust:1.59 as BUILD
 
+ARG RUSTFLAGS='-C link-arg=-s'
+ARG TARGET='x86_64-unknown-linux-musl'
+
 RUN USER=root cargo new --bin docker-vhoster
 WORKDIR /docker-vhoster
 
 # copy over your manifests
 COPY ./Cargo.toml ./Cargo.toml
 
-# this build step will cache your dependencies
-RUN cargo build --release && rm src/*.rs
+ENV RUSTFLAGS=${RUSTFLAGS}
+# cache deps
+RUN rustup target add ${TARGET} && cargo build --release --target ${TARGET} && rm src/*.rs
 COPY ./src /docker-vhoster/src
-RUN cargo build --release --bin 
+# build as a statically linked library
+RUN cargo build --release --target ${TARGET} --bin docker-vhoster
+#RUN ls -alh /docker-vhoster/target/${TARGET} && exit 1  
 
-# our final base
-FROM debian:bullseye-slim
-# copy the build artifact from the build stage
-COPY --from=BUILD docker-vhoster .
-# set the startup command to run your binary
-CMD ["./docker-vhoster"]
+FROM scratch
+ARG TARGET='x86_64-unknown-linux-musl'
+COPY --from=BUILD /docker-vhoster/target/${TARGET}/release/docker-vhoster /
+CMD ["/docker-vhoster"]