switch to alpine

redis/Dockerfile

-FROM debian:stretch-slim
+FROM alpine:3.8
 
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
-RUN groupadd -r redis && useradd -r -g redis redis
+RUN addgroup -S redis && adduser -S -G redis redis
 
-# grab gosu for easy step-down from root
-# https://github.com/tianon/gosu/releases
-ENV GOSU_VERSION 1.10
-RUN set -ex; \
-	\
-	fetchDeps=" \
-		ca-certificates \
-		dirmngr \
-		gnupg \
-		wget \
-	"; \
-	apt-get update; \
-	apt-get install -y --no-install-recommends $fetchDeps; \
-	rm -rf /var/lib/apt/lists/*; \
-	\
-	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
-	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
-	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
-	export GNUPGHOME="$(mktemp -d)"; \
-	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
-	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
-	gpgconf --kill all; \
-	rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc; \
-	chmod +x /usr/local/bin/gosu; \
-	gosu nobody true; \
-	\
-	apt-get purge -y --auto-remove $fetchDeps
+RUN apk add --no-cache \
+# grab su-exec for easy step-down from root
+		'su-exec>=0.2' \
+# add tzdata for https://github.com/docker-library/redis/issues/138
+		tzdata
 
 ENV REDIS_VERSION 5.0.0
 ENV REDIS_DOWNLOAD_URL http://download.redis.io/releases/redis-5.0.0.tar.gz
@@ -38,17 +16,14 @@ ENV REDIS_DOWNLOAD_SHA 70c98b2d0640b2b73c9d8adb4df63bcb62bad34b788fe46d1634b6cf8
 # for redis-sentinel see: http://redis.io/topics/sentinel
 RUN set -ex; \
 	\
-	buildDeps=' \
-		ca-certificates \
-		wget \
-		\
+	apk add --no-cache --virtual .build-deps \
+		coreutils \
 		gcc \
-		libc6-dev \
+		jemalloc-dev \
+		linux-headers \
 		make \
-	'; \
-	apt-get update; \
-	apt-get install -y $buildDeps --no-install-recommends; \
-	rm -rf /var/lib/apt/lists/*; \
+		musl-dev \
+	; \
 	\
 	wget -O redis.tar.gz "$REDIS_DOWNLOAD_URL"; \
 	echo "$REDIS_DOWNLOAD_SHA *redis.tar.gz" | sha256sum -c -; \
@@ -71,7 +46,16 @@ RUN set -ex; \
 	\
 	rm -r /usr/src/redis; \
 	\
-	apt-get purge -y --auto-remove $buildDeps
+	runDeps="$( \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
+			| tr ',' '\n' \
+			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
+	)"; \
+	apk add --virtual .redis-rundeps $runDeps; \
+	apk del .build-deps; \
+	\
+	redis-server --version
 
 RUN mkdir /data && chown redis:redis /data
 VOLUME /data

redis/docker-entrypoint.sh

@@ -10,7 +10,7 @@ fi
 # allow the container to be started with `--user`
 if [ "$1" = 'redis-server' -a "$(id -u)" = '0' ]; then
     find . \! -user redis -exec chown redis '{}' +
-	exec gosu redis "$0" "$@"
+    exec su-exec redis "$0" "$@"
 fi
 
 exec "$@"
\ No newline at end of file