add zookeeper

Change-Id: I7c45fca36c6705400ac97ee800dc3691e4e50f74

zookeeper/Dockerfile

+FROM registry-vpc.cn-hangzhou.aliyuncs.com/schbrain/jdk:8u172
+MAINTAINER xt
+
+ENV ZOO_CONF_DIR=/conf \
+    ZOO_DATA_DIR=/data \
+    ZOO_DATA_LOG_DIR=/datalog \
+    ZOO_LOG_DIR=/logs \
+    ZOO_TICK_TIME=2000 \
+    ZOO_INIT_LIMIT=5 \
+    ZOO_SYNC_LIMIT=2 \
+    ZOO_AUTOPURGE_PURGEINTERVAL=0 \
+    ZOO_AUTOPURGE_SNAPRETAINCOUNT=3 \
+    ZOO_MAX_CLIENT_CNXNS=60 \
+    ZOO_STANDALONE_ENABLED=true \
+    ZOO_ADMINSERVER_ENABLED=true
+
+# Add a user with an explicit UID/GID and create necessary directories
+RUN set -eux; \
+    groupadd -r zookeeper --gid=1000; \
+    useradd -r -g zookeeper --uid=1000 zookeeper; \
+    mkdir -p "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR" "$ZOO_LOG_DIR"; \
+    chown zookeeper:zookeeper "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR" "$ZOO_LOG_DIR"
+
+# Install required packges
+RUN set -eux; \
+    apt-get update; \
+    DEBIAN_FRONTEND=noninteractive \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        dirmngr \
+        gosu \
+        gnupg \
+        netcat \
+        wget; \
+    rm -rf /var/lib/apt/lists/*; \
+# Verify that gosu binary works
+    gosu nobody true
+
+ARG GPG_KEY=3F7A1D16FA4217B1DC75E1C9FFE35B7F15DFA1BA
+ARG SHORT_DISTRO_NAME=zookeeper-3.5.5
+ARG DISTRO_NAME=apache-zookeeper-3.5.5-bin
+
+# Download Apache Zookeeper, verify its PGP signature, untar and clean up
+RUN set -eux; \
+    wget -q "https://www.apache.org/dist/zookeeper/$SHORT_DISTRO_NAME/$DISTRO_NAME.tar.gz"; \
+    wget -q "https://www.apache.org/dist/zookeeper/$SHORT_DISTRO_NAME/$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 -zxf "$DISTRO_NAME.tar.gz"; \
+    mv "$DISTRO_NAME/conf/"* "$ZOO_CONF_DIR"; \
+    rm -rf "$GNUPGHOME" "$DISTRO_NAME.tar.gz" "$DISTRO_NAME.tar.gz.asc"; \
+    chown -R zookeeper:zookeeper "/$DISTRO_NAME"
+
+WORKDIR $DISTRO_NAME
+VOLUME ["$ZOO_DATA_DIR", "$ZOO_DATA_LOG_DIR", "$ZOO_LOG_DIR"]
+
+EXPOSE 2181 2888 3888 8080
+
+ENV PATH=$PATH:/$DISTRO_NAME/bin \
+    ZOOCFGDIR=$ZOO_CONF_DIR
+
+COPY docker-entrypoint.sh /
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["zkServer.sh", "start-foreground"]

zookeeper/docker-entrypoint.sh

+#!/bin/bash
+
+set -e
+
+# Allow the container to be started with `--user`
+if [[ "$1" = 'zkServer.sh' && "$(id -u)" = '0' ]]; then
+    chown -R zookeeper "$ZOO_DATA_DIR" "$ZOO_DATA_LOG_DIR" "$ZOO_LOG_DIR" "$ZOO_CONF_DIR"
+    exec gosu zookeeper "$0" "$@"
+fi
+
+# Generate the config only if it doesn't exist
+if [[ ! -f "$ZOO_CONF_DIR/zoo.cfg" ]]; then
+    CONFIG="$ZOO_CONF_DIR/zoo.cfg"
+
+    echo "dataDir=$ZOO_DATA_DIR" >> "$CONFIG"
+    echo "dataLogDir=$ZOO_DATA_LOG_DIR" >> "$CONFIG"
+
+    echo "tickTime=$ZOO_TICK_TIME" >> "$CONFIG"
+    echo "initLimit=$ZOO_INIT_LIMIT" >> "$CONFIG"
+    echo "syncLimit=$ZOO_SYNC_LIMIT" >> "$CONFIG"
+
+    echo "autopurge.snapRetainCount=$ZOO_AUTOPURGE_SNAPRETAINCOUNT" >> "$CONFIG"
+    echo "autopurge.purgeInterval=$ZOO_AUTOPURGE_PURGEINTERVAL" >> "$CONFIG"
+    echo "maxClientCnxns=$ZOO_MAX_CLIENT_CNXNS" >> "$CONFIG"
+    echo "standaloneEnabled=$ZOO_STANDALONE_ENABLED" >> "$CONFIG"
+    echo "admin.enableServer=$ZOO_ADMINSERVER_ENABLED" >> "$CONFIG"
+
+    if [[ -z $ZOO_SERVERS ]]; then
+      ZOO_SERVERS="server.1=localhost:2888:3888;2181"
+    fi
+
+    for server in $ZOO_SERVERS; do
+        echo "$server" >> "$CONFIG"
+    done
+fi
+
+# Write myid only if it doesn't exist
+if [[ ! -f "$ZOO_DATA_DIR/myid" ]]; then
+    echo "${ZOO_MY_ID:-1}" > "$ZOO_DATA_DIR/myid"
+fi
+
+exec "$@"