add zookeeper

Signed-off-by: Jess Frazelle <jess@oxide.computer>

zookeeper/3.6/Dockerfile

@@ -0,0 +1,23 @@
+FROM openjdk:8-alpine
+
+ENV ZOOKEEPER_VERSION 3.6.1
+ENV PATH $PATH:/opt/zookeeper/bin/
+
+# the start files for zookeeper use bash
+RUN apk --no-cache add \
+	bash
+
+RUN buildDeps=' \
+		curl \
+		tar \
+	' \
+	&& echo "==> Installing dependencies..." \
+	&& apk --no-cache add --virtual build-deps $buildDeps \
+	&& echo "==> Downloading Zookeeper..." \
+	&& mkdir -p /opt \
+	&& curl -sSL "http://apache.osuosl.org/zookeeper/zookeeper-${ZOOKEEPER_VERSION}/apache-zookeeper-${ZOOKEEPER_VERSION}.tar.gz" | tar -xzf - -C /opt \
+	&& mv /opt/apache-zookeeper-${ZOOKEEPER_VERSION} /opt/zookeeper \
+	&& cp /opt/zookeeper/conf/zoo_sample.cfg /opt/zookeeper/conf/zoo.cfg \
+	&& apk del build-deps
+
+ENTRYPOINT ["zkServer.sh", "start-foreground"]