Improved and minimalized docker image

build/docker/Dockerfile

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+FROM alpine:latest
+
+MAINTAINER Mikal Villa <mikal@sigterm.no>
+
+ENV GIT_BRANCH="master"
+ENV I2PD_PREFIX="/opt/i2pd-${GIT_BRANCH}"
+ENV PATH=${I2PD_PREFIX}/bin:$PATH
+
+ENV GOSU_VERSION=1.7
+ENV GOSU_SHASUM="34049cfc713e8b74b90d6de49690fa601dc040021980812b2f1f691534be8a50  /usr/local/bin/gosu"
+
+RUN mkdir /user && adduser -S -h /user i2pd && chown -R i2pd:nobody /user
+
+
+#
+# Each RUN is a layer, adding the dependencies and building i2pd in one layer takes around 8-900Mb, so to keep the 
+# image under 20mb we need to remove all the build dependencies in the same "RUN" / layer.
+#
+
+# 1. install deps, clone and build. 
+# 2. strip binaries. 
+# 3. Purge all dependencies and other unrelated packages, including build directory. 
+RUN apk --no-cache --virtual build-dependendencies add make gcc g++ libtool boost-dev build-base openssl-dev openssl git \
+    && mkdir -p /tmp/build \
+    && cd /tmp/build && git clone -b ${GIT_BRANCH} https://github.com/PurpleI2P/i2pd.git \
+    && cd i2pd \
+    && make -j4 \
+    && mkdir -p ${I2PD_PREFIX}/bin \
+    && mv i2pd ${I2PD_PREFIX}/bin/ \
+    && cd ${I2PD_PREFIX}/bin \
+    && strip i2pd \
+    && rm -fr /tmp/build && apk --purge del build-dependendencies build-base fortify-headers boost-dev zlib-dev openssl-dev \
+    boost-python3 python3 gdbm boost-unit_test_framework boost-python linux-headers boost-prg_exec_monitor \
+    boost-serialization boost-signals boost-wave boost-wserialization boost-math boost-graph boost-regex git pcre \
+    libtool g++ gcc pkgconfig
+
+# 2. Adding required libraries to run i2pd to ensure it will run.
+RUN apk --no-cache add boost-filesystem boost-system boost-program_options boost-date_time boost-thread boost-iostreams openssl musl-utils libstdc++
+
+# Gosu is a replacement for su/sudo in docker and not a backdoor :) See https://github.com/tianon/gosu
+RUN wget -O /usr/local/bin/gosu https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-amd64 \
+    && echo "${GOSU_SHASUM}" | sha256sum -c && chmod +x /usr/local/bin/gosu
+
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chmod a+x /entrypoint.sh
+RUN echo "export PATH=${PATH}" >> /etc/profile
+
+VOLUME [ "/var/lib/i2pd" ]
+
+EXPOSE 7070 4444 4447 7656 2827 7654 7650
+
+ENTRYPOINT [ "/entrypoint.sh" ]
+

build/docker/entrypoint.sh

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+#!/bin/sh
+
+ARGS=""
+if [ "${ENABLE_IPV6}" != "" ]; then
+  ARGS="${ARGS} –ipv6"
+fi
+
+if [ "${LOGLEVEL}" != "" ]; then
+  ARGS="${ARGS} –loglevel=${LOGLEVEL}"
+fi
+
+if [ "${ENABLE_AUTH}" != "" ]; then
+  ARGS="${ARGS} –http.auth"
+fi
+
+
+# To make ports exposeable
+DEFAULT_ARGS=" –http.address=0.0.0.0 –httpproxy.address=0.0.0.0 -socksproxy.address=0.0.0.0 –sam.address=0.0.0.0 –bob.address=0.0.0.0 –i2cp.address=0.0.0.0 –i2pcontrol.port=0.0.0.0 –upnp.enabled=false -service "
+
+mkdir -p /var/lib/i2pd && chown -R i2pd:nobody /var/lib/i2pd && chmod u+rw /var/lib/i2pd
+
+gosu i2pd i2pd $DEFAULT_ARGS $ARGS
+
+