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.jarlib/a.jarb.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> 11: 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.jar1: 64M
2: 128M
3: 256M
Memory Limit> 64M // 示例应用，不改了Creating mistsockotest... OK1: msckotest.cloudfoundry.com
2: none
Domain> msockotest.cloudfoundry.comUpdating msockotest... OKCreate services for application?> nSave configuration?> nUploading 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 CLASSPATHjava $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> 110: standalone
Framework> 102: java7
Runtime> 2Startup command> ./startup.sh1: 64M
Memory Limit> 64MCreating msockotest... OK1: msockotest.cloudfoundry.com
2: none
URL> msockotest.cloudfoundry.comUpdating msockotest... OKCreate services for application?> nBind other services to application?> nSave configuration?> nUploading 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... OKdist>vmc push msockotest
...
1: 64M
2: 128M
3: 256M
4: 512M
Memory Limit> 2Creating 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。