在CloudFoundry上部署独立Java应用
昨天知道了一个Scala Web框架，感觉相当不错。
由于它是基于Netty的，不能通过Web容器部署，有点犹豫要不要用它，不知道能不能在CloudFoundry上发布。
之后搜到一篇关于在CloudFoundry上部署独立应用的文章，于是开始尝试。
首先，开发了一个简单的Socko示例应用，打完包以后目录结构大概是这样：
dist/
main.jar
lib/
a.jar
b.jar
其中IP和端口绑定代码为：
hostname = Option(System.getenv("VCAP_APP_HOST")).getOrElse("localhost"),
port = Option(System.getenv("VCAP_APP_PORT")).getOrElse("8080").toInt 理论上，我只需要把dist目录下的所有内容上传（vmc）到cloudfoundry上即可。
上传过程：
dist>vmc push msockotest DL is deprecated, please use Fiddle Instances> 1 1: grails 2: java_web 3: lift 4: node 5: play 6: rack 7: rails3 8: sinatra 9: spring 10: standalone Framework> 10 // 选10，独立部署 1: java 2: java7 3: node 4: node06 5: node08 6: ruby18 7: ruby19 Runtime> 2 // 是Java7开发的 Custom startup command> java -jar study_socko_2.10-0.1.jar 1: 64M 2: 128M 3: 256M Memory Limit> 64M // 示例应用，不改了 Creating mistsockotest... OK 1: msckotest.cloudfoundry.com 2: none Domain> msockotest.cloudfoundry.com Updating msockotest... OK Create services for application?> n Save configuration?> n Uploading mistsockotest... FAILED Upload failed. Try again with 'vmc push'. TypeError: no implicit conversion of nil into String For more information, see ~/.vmc/crash结果却上传失败了，没有找到原因。替代方法是将启动命令写到脚本里：
startup.sh
CLASSPATH="./*:./lib/*" export CLASSPATH java $JAVA_OPTS helloexample.HelloApp
脚本放在dist下。然后把Custom startup command写成
./startup.sh
上传成功。再试，失败，然后无论怎么上传都是失败，就成功了一次。Google一下，发现很多人遇到这个问题，有人提出是新版本vmc的问题，于是卸载vmc0.5，安装0.4版：
gem uninstall vmc uninstall tunnel-vmc-plugin # gem install -v 0.3.21 vmc gem install -v 0.4.0 vmc重新上传
dist>vmc push msockotest Instances> 1 10: standalone Framework> 10 2: java7 Runtime> 2 Startup command> ./startup.sh 1: 64M Memory Limit> 64M Creating msockotest... OK 1: msockotest.cloudfoundry.com 2: none URL> msockotest.cloudfoundry.com Updating msockotest... OK Create services for application?> n Bind other services to application?> n Save configuration?> n Uploading msockotest... OK Starting msockotest... OK Checking msockotest... GAVE UP Application failed to start.上传成功，但启动失败了，于是查看日志：
dist>vmc files msockotest --path logs/err.log DL is deprecated, please use Fiddle Getting file contents... OK # Logfile created on 2013-04-23 05:57:24 +0000 by logger.rb/25413 F, [2013-04-23T05:57:24.510280 #25207] FATAL -- : Memory limit of 64M exceeded. F, [2013-04-23T05:57:24.510350 #25207] FATAL -- : Actual usage was 65M, process terminated.好象是内存不够，于是把Memory Limit改成128M
dist>vmc delete msockotest ... Deleting msockotest... OK dist>vmc push msockotest ... 1: 64M 2: 128M 3: 256M 4: 512M Memory Limit> 2 Creating msockotest... OK ... Uploading msockotest... OK Starting msockotest... OK Checking msockotest... OK
成功，就是Checking的过程稍微有点漫长，吓得我以为又失败了呢。
dist>vmc files msockotest --path logs/stdout.log
DL is deprecated, please use Fiddle
Getting file contents... OK
./*:./lib/*
06:01:14.118 [HelloExampleActorSystem-akka.actor.default-dispatcher-4] [] INFO akka.event.slf4j.Slf4jEventHandler - Sl
f4jEventHandler started
06:01:14.228 [main] [] INFO o.m.socko.webserver.WebServer - Socko server '[WebServer, 172.30.49.146, 46824]' started o
n {}:{} 日志中可以看到这个应用实际绑定IP和端口。
用浏览器访问http://msockotest.cloudfoundry.com/，得到
Hello from Socko (Tue Apr 23 06:07:28 UTC 2013)终于完成了，真曲折啊。