add docker

code/docker/zookeeper/Dockerfile

@@ -0,0 +1,56 @@
+FROM openjdk:8-jre-alpine
+
+# Install required packages
+RUN apk add --no-cache \
+    bash \
+    su-exec
+
+ENV ZOO_USER=zookeeper \
+    ZOO_CONF_DIR=/conf \
+    ZOO_DATA_DIR=/data \
+    ZOO_DATA_LOG_DIR=/datalog \
+    ZOO_PORT=2181 \
+    ZOO_TICK_TIME=2000 \
+    ZOO_INIT_LIMIT=5 \
+    ZOO_SYNC_LIMIT=2 \
+    ZOO_MAX_CLIENT_CNXNS=60
+
+# Add a user and make dirs
+RUN set -ex; \
+    adduser -D "$ZOO_USER"; \
+    mkdir -p "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR"; \
+    chown "$ZOO_USER:$ZOO_USER" "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR"
+
+ARG GPG_KEY=D0BC8D8A4E90A40AFDFC43B3E22A746A68E327C1
+ARG DISTRO_NAME=zookeeper-3.4.11
+
+# Download Apache Zookeeper, verify its PGP signature, untar and clean up
+RUN set -ex; \
+    apk add --no-cache --virtual .build-deps \
+        ca-certificates \
+        gnupg \
+        libressl; \
+    wget -q "https://www.apache.org/dist/zookeeper/$DISTRO_NAME/$DISTRO_NAME.tar.gz"; \
+    wget -q "https://www.apache.org/dist/zookeeper/$DISTRO_NAME/$DISTRO_NAME.tar.gz.asc"; \
+    export GNUPGHOME="$(mktemp -d)"; \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-key "$GPG_KEY" || \
+    gpg --keyserver pgp.mit.edu --recv-keys "$GPG_KEY" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$GPG_KEY"; \
+    gpg --batch --verify "$DISTRO_NAME.tar.gz.asc" "$DISTRO_NAME.tar.gz"; \
+    tar -xzf "$DISTRO_NAME.tar.gz"; \
+    mv "$DISTRO_NAME/conf/"* "$ZOO_CONF_DIR"; \
+    rm -rf "$GNUPGHOME" "$DISTRO_NAME.tar.gz" "$DISTRO_NAME.tar.gz.asc"; \
+    apk del .build-deps
+
+WORKDIR $DISTRO_NAME
+VOLUME ["$ZOO_DATA_DIR", "$ZOO_DATA_LOG_DIR"]
+
+EXPOSE $ZOO_PORT 2888 3888
+
+ENV PATH=$PATH:/$DISTRO_NAME/bin \
+    ZOOCFGDIR=$ZOO_CONF_DIR
+
+COPY docker-entrypoint.sh /
+RUN chmod +x /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["zkServer.sh", "start-foreground"]