日志系统（Log）对于一个应用程序更是对一个云平台的 Maintainability 至关重要。 CloudFoundry Platform 也不例外，开发了她自己的日志管理系统 Loggregator。
关于Loggregator详细的架构，对 CloudFoundry 平台管理感兴趣的读者可以详细研读其文档。本篇我们只介绍如何把 CloudFoundry 应用的日志收集到第三方日志管理系统中，以便进行详细分析。
Log Management Services
Cloud Foundry 支持众多第三方日志管理系统，包括 Logit.io, Papertrail, Splunk, Splunk Storm, SumoLogic, Logsene 等。我们不深入介绍各个系统的异同优劣，只介绍如何同 Cloud Foundry 配置起来。
Papertrail
Papertrail 相对比较简单易懂，作为入门比较合适。注册用户后访问链接 https://papertrailapp.com/systems/new 创建一个新的日志系统，选择 I use Cloud Foundry 你会得到提示：
CloudFoundry will log to logs6.papertrailapp.com:48899 and appear in CloudFoundry Events.
然后创建 CloudFoundry 的 User-Provided Service Instances
$ cf cups my-logs -l syslog-tls://logs6.papertrailapp.com:48899
-l 参数说明一个日志系统链接，应用程序可以往此链接上写入日志内容。
然后把此 User-Provided Service Instance 绑定给你需要输出日志的应用程序
$ cf bind-service cook my-logs
重启应用使配置生效，你便可以在这个第三方日志管理系统中看到 CloudFoundry 应用程序的日志了
$ cf restage cook
syslog URL
Cloud Foundry uses the syslog URL to route messages to the service. The syslog URL has a scheme of syslog, syslog-tls, or https, and can include a port number. For example:
syslog://logs.example.com:1234
Elastic Runtime does not support using
syslog-tlswith self-signed certificates. If you are running your own syslog server and want to usesyslog-tls, you must have an SSL certificate signed by a well-known certificate authority.
references:
https://docs.pivotal.io/pivotalcf/1-6/devguide/services/log-management.html
http://scottfrederick.cfapps.io/blog/2014/02/20/cloud-foundry-and-logstash
https://stackoverflow.com/questions/34181094/set-logging-level-in-spring-boot-via-environment-variable
https://docs.spring.io/spring-boot/docs/current/reference/html/howto-logging.html
https://commons.apache.org/proper/commons-logging/
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