Create cassandra microservice

Signed-off-by: wangjue <wang.jue@intel.com>

cassandra/Dockerfile

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+FROM clearlinux:latest AS builder
+
+# Move to latest Clear Linux release to ensure
+# that the swupd command line arguments are
+# correct
+RUN swupd update --no-boot-update $swupd_args
+
+# Grab os-release info from the minimal base image so
+# that the new content matches the exact OS version
+COPY --from=clearlinux/os-core:latest /usr/lib/os-release /
+
+# Install additional content in a target directory
+# using the os version from the minimal base
+RUN source /os-release && \
+    mkdir /install_root \
+    && swupd os-install -V ${VERSION_ID} \
+    --path /install_root --statedir /swupd-state \
+    --bundles=cassandra,python2-basic,which --no-scripts \
+    && rm -rf /install_root/var/lib/swupd/*
+
+# For some Host OS configuration with redirect_dir on,
+# extra data are saved on the upper layer when the same
+# file exists on different layers. To minimize docker
+# image size, remove the overlapped files before copy.
+RUN mkdir /os_core_install
+COPY --from=clearlinux/os-core:latest / /os_core_install/
+RUN cd / && \
+    find os_core_install | sed -e 's/os_core_install/install_root/' | xargs rm -d || true
+
+FROM clearlinux/os-core:latest
+MAINTAINER wang.jue@intel.com
+
+COPY --from=builder /install_root /
+
+ENV CASSANDRA_CONFIG /usr/share/cassandra/conf
+ENV PATH /usr/share/cassandra/bin:$PATH
+
+RUN mkdir -p /var/lib/cassandra/{cdc_raw,commitlog,data,hints,saved_caches}  \
+        && chown -R cassandra:cassandra /var/lib/cassandra "$CASSANDRA_CONFIG" \
+        && chmod -R 777 /var/lib/cassandra "$CASSANDRA_CONFIG"
+VOLUME /var/lib/cassandra
+
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh 
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+
+# 7000: intra-node communication
+# 7001: TLS intra-node communication
+# 7199: JMX
+# 9042: CQL
+# 9160: thrift service
+EXPOSE 7000 7001 7199 9042 9160
+CMD ["cassandra", "-f"]

cassandra/README.md

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+Cassandra
+==========
+This provides a Clear Linux* Cassandra instance.
+
+Build
+-----
+```
+docker build -t clearlinux/cassandra .
+```
+
+Or just pull it from Dockerhub
+---------------------------
+```
+docker pull clearlinux/cassandra
+```
+
+start a cassandra instance
+-----------------------
+```
+docker run --name some-cassandra --network some-network -d clearlinux/cassandra:tag
+```
+
+connect to cassandra from cqlsh
+---------------------
+```
+docker run -it --network some-network --rm clearlinux/cassandra cqlsh -h some-cassandra
+```
+
+benchmark test
+---------------------
+```
+TBD
+```
+
+details of how-to
+---------------------
+Please refer to the official cassandra image [page](https://hub.docker.com/_/cassandra).
+
+Extra Build ARGs
+----------------
+- ``swupd_args`` Specifies [SWUPD](https://github.com/clearlinux/swupd-client/blob/master/docs/swupd.1.rst#options) flags
+
+Default build args in Docker are on: https://docs.docker.com/engine/reference/builder/#arg

cassandra/docker-entrypoint.sh

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+#!/bin/bash
+set -e
+
+# first arg is `-f` or `--some-option`
+# or there are no args
+if [ "$#" -eq 0 ] || [ "${1#-}" != "$1" ]; then
+	set -- cassandra -f "$@"
+fi
+
+# allow the container to be started with `--user`
+if [ "$1" = 'cassandra' -a "$(id -u)" = '0' ]; then
+	exec su cassandra -s /bin/bash -c "$BASH_SOURCE" "$@"
+fi
+
+_ip_address() {
+	# scrape the first non-localhost IP address of the container
+	# in Swarm Mode, we often get two IPs -- the container IP, and the (shared) VIP, and the container IP should always be first
+	ip address | awk '
+		$1 == "inet" && $NF != "lo" {
+			gsub(/\/.+$/, "", $2)
+			print $2
+			exit
+		}
+	'
+}
+
+# "sed -i", but without "mv" (which doesn't work on a bind-mounted file, for example)
+_sed-in-place() {
+	local filename="$1"; shift
+	local tempFile
+	tempFile="$(mktemp)"
+	sed "$@" "$filename" > "$tempFile"
+	cat "$tempFile" > "$filename"
+	rm "$tempFile"
+}
+
+if [ "$1" = 'cassandra' ]; then
+	: ${CASSANDRA_RPC_ADDRESS='0.0.0.0'}
+
+	: ${CASSANDRA_LISTEN_ADDRESS='auto'}
+	if [ "$CASSANDRA_LISTEN_ADDRESS" = 'auto' ]; then
+		CASSANDRA_LISTEN_ADDRESS="$(_ip_address)"
+	fi
+
+	: ${CASSANDRA_BROADCAST_ADDRESS="$CASSANDRA_LISTEN_ADDRESS"}
+
+	if [ "$CASSANDRA_BROADCAST_ADDRESS" = 'auto' ]; then
+		CASSANDRA_BROADCAST_ADDRESS="$(_ip_address)"
+	fi
+	: ${CASSANDRA_BROADCAST_RPC_ADDRESS:=$CASSANDRA_BROADCAST_ADDRESS}
+
+	if [ -n "${CASSANDRA_NAME:+1}" ]; then
+		: ${CASSANDRA_SEEDS:="cassandra"}
+	fi
+	: ${CASSANDRA_SEEDS:="$CASSANDRA_BROADCAST_ADDRESS"}
+
+	_sed-in-place "$CASSANDRA_CONFIG/cassandra.yaml" \
+		-r 's/(- seeds:).*/\1 "'"$CASSANDRA_SEEDS"'"/'
+
+	for yaml in \
+		broadcast_address \
+		broadcast_rpc_address \
+		cluster_name \
+		endpoint_snitch \
+		listen_address \
+		num_tokens \
+		rpc_address \
+		start_rpc \
+	; do
+		var="CASSANDRA_${yaml^^}"
+		val="${!var}"
+		if [ "$val" ]; then
+			_sed-in-place "$CASSANDRA_CONFIG/cassandra.yaml" \
+				-r 's/^(# )?('"$yaml"':).*/\2 '"$val"'/'
+		fi
+	done
+
+	for rackdc in dc rack; do
+		var="CASSANDRA_${rackdc^^}"
+		val="${!var}"
+		if [ "$val" ]; then
+			_sed-in-place "$CASSANDRA_CONFIG/cassandra-rackdc.properties" \
+				-r 's/^('"$rackdc"'=).*/\1 '"$val"'/'
+		fi
+	done
+fi
+
+exec "$@"