Docker containerでClojureのWAFであるLuminusを動かしてみる
事前準備
- boot2dockerのinstall
- leiningenのinstall
プロジェクト生成と実行
$ lein new luminus hello-world
$ cd hello-world/
$ lein run
Retrieving org/clojure/clojure/1.7.0-RC2/clojure-1.7.0-RC2.pom from central
Retrieving org/clojure/clojure/1.7.0-RC2/clojure-1.7.0-RC2.jar from central
2015-6-26 13:02:18 +0900 SPC-072.local INFO [hello-world.handler] -
-=[ hello-world started successfullyusing the development profile]=-
2015-06-26 13:02:18.357:INFO:oejs.Server:jetty-7.6.13.v20130916
2015-06-26 13:02:18.439:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:3000
ブラウザで開く
$ open http://localhost:3000
Dockerfile
方針
- imageはdocker hubのjava8を使う
- containerにuberjarを含める
leiningen run
だとcontainer起動後から接続可能になるまで時間がかかる- Elastic Beanstalkだと結構致命的
CMD
はexec form
じゃなくshell form
で書くsh
経由で立ち上がるので、ENV
でセットした環境変数が受け取れるCMD
ならdocker run
時に簡単に書き換えられる
Dockerfile
FROM java:8
ENV TZ JST-9
ENV JVM_OPTS -server -Xms512m -Xmx512m -Xmn256m
RUN mkdir -p /home/app
COPY ./target/hello-worldjar /home/app/
EXPOSE 3000
WORKDIR /home/app
CMD /usr/bin/java $JVM_OPTS -jar hello-world.jar 3000
詳しくはDockerfile referenceを参照。
containerの作成と立ち上げ
uberjar作成
$ lein uberjar
Compiling hello-world.core
Compiling hello-world.handler
Compiling hello-world.layout
Compiling hello-world.middleware
Compiling hello-world.routes.home
Compiling hello-world.session
Created /path/to/project/hello-world/target/hello-world-0.1.0-SNAPSHOT.jar
Created /path/to/project/hello-world/target/hello-world.jar
container作成
$ docker build -t luminus/hello-world .
Sending build context to Docker daemon 56.42 MB
Sending build context to Docker daemon
Step 0 : FROM java:8
---> 433801eb0894
Step 1 : ENV TZ JST-9
---> Running in ac5801626c85
---> 77b3c91b3d78
Removing intermediate container ac5801626c85
Step 2 : ENV JVM_OPTS -server -Xms512m -Xmx512m -Xmn256m
---> Running in 5c6a50907c9d
---> 9db9e3ecf034
Removing intermediate container 5c6a50907c9d
Step 3 : RUN mkdir -p /home/app
---> Running in 4e0e9d8c0b15
---> 9af2a4c10750
Removing intermediate container 4e0e9d8c0b15
Step 4 : COPY ./target/hello-world.jar /home/app/
---> 4e89615ff644
Removing intermediate container 88d653f5d04f
Step 5 : EXPOSE 3000
---> Running in 383fc9ad8ee1
---> 0ecb672ec459
Removing intermediate container 383fc9ad8ee1
Step 6 : WORKDIR /home/app
---> Running in eb575c33ce63
---> 158e8dbc87eb
Removing intermediate container eb575c33ce63
Step 7 : CMD /usr/bin/java $JVM_OPTS -jar hello-world.jar 3000
---> Running in 344eac7db8b2
---> 132b7b08093a
Removing intermediate container 344eac7db8b2
Successfully built 132b7b08093a
docker run
$ docker run --rm -it -p 3000:3000 luminus/hello-world
2015-Jun-26 13:47:52 +0900 9ae20b5deccf INFO [hello-world.handler] -
-=[ hello-world started successfully]=-
2015-06-26 13:47:52.424:INFO:oejs.Server:jetty-7.x.y-SNAPSHOT
2015-06-26 13:47:52.513:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:3000
-p
オプションでcontainer側のTCP/3000をhost側(localhostじゃない)のTCP/3000にマッピングしているので、
boot2docker
コマンドでhost側のIPを調べて接続する
$ open http://$(boot2docker ip):3000
TODO
そのうち以下について書く
- Docker Compose
- Docker + ElasticBeanstalk