Add memcached container

Signed-off-by: Qi Zheng <qi.zheng@intel.com>

.travis.yml

@@ -17,6 +17,7 @@ env:
   - DOCKERFILE_DIR=httpd
   - DOCKERFILE_DIR=elasticsearch
   - DOCKERFILE_DIR=cgit
+  - DOCKERFILE_DIR=memcached
 
 script:
   - cd $DOCKERFILE_DIR

README.md

@@ -14,6 +14,7 @@ Containers
 - mixer-ci
 - Keystone
 - MariaDB
+- memcached
 - redis
 - stacks-dlrs-oss
 - stacks-dlrs-mkl

memcached/Dockerfile

@@ -0,0 +1,16 @@
+FROM clearlinux:latest
+MAINTAINER qi.zheng@intel.com
+
+ARG swupd_args
+
+RUN swupd update $swupd_args \
+	&& swupd bundle-add memcached $swupd_args \
+	&& rm -rf /var/lib/swupd/*
+
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+
+EXPOSE 11211
+CMD ["memcached"]

memcached/README.md

@@ -0,0 +1,36 @@
+memcached
+==========
+This provides a Clear Linux* memcached instance.
+
+Build
+-----
+```
+docker build -t clearlinux/memcached .
+```
+
+Or just pull it from Dockerhub
+---------------------------
+```
+docker pull clearlinux/memcached
+```
+
+Start a memcached server 
+-----------------------
+```
+docker run --network somenetwork --name memcached-server -d clearlinux/memcached
+```
+
+Benchmark test using memtier benchmark
+---------------------
+Please refer to the [page](https://github.com/RedisLabs/memtier_benchmark) for details.
+
+```
+docker pull redislabs/memtier_benchmark
+docker run --rm --network somenetwork redislabs/memtier_benchmark ./memtier_benchmark --server=memcached-server -p 11211 -P memcache_text
+```
+
+Extra Build ARGs
+----------------
+- ``swupd_args`` Specifies [SWUPD](https://clearlinux.org/documentation/swupdate_how_to_run_the_updater.html) flags
+
+Default build args in Docker are on: https://docs.docker.com/engine/reference/builder/#arg

memcached/docker-entrypoint.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -e
+
+# first arg is `-f` or `--some-option`
+if [ "${1#-}" != "$1" ]; then
+	set -- memcached "$@"
+fi
+
+if [ "$1" = 'memcached' -a "$(id -u)" = '0' ]; then
+        echo "memcached -s /bin/bash -c \"$0 $@\"" | xargs su
+fi
+
+exec "$@"