CloudFoundry: Logging for the spring-music webapp, Part 4

Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale.  This article is part of a series that explores different facets of a Cloud Foundry deployment using the spring-music project as an example.

This article is Part 4 of  a series on Cloud Foundry concepts:

In this particular article, we will look at the Cloud Foundry log types, how to configure logback for spring-music, and then how to inject those events into a log pipeline.

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Docker: Sending Spring Boot logging to syslog

Building services using Spring Boot gives a development team a jump start on many production concerns, including logging.  But unlike a standard deployment where logging to a local file is where the developer’s responsibility typically ends, with Docker we must think about how to log to a public space outside our ephemeral container space.

The Docker logging drivers capture all the output from a container’s stdout/stderr, and can send a container’s logs directly to most major logging solutions (syslog, Logstash, gelf, fluentd).

As an added benefit, by making the logging implementation a runtime choice for the container, it provides flexibility to use a simpler implementation during development but a highly-available, scalable logging solution in production.

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Syslog: Sending Java log4j2 to rsyslog on Ubuntu

log4j-logoLogging has always been a critical part of application development.  But the rise of OS virtualization, applications containers, and cloud-scale logging solutions has turned logging into something bigger that managing local debug files.

Modern applications and services are now expected to feed log aggregation and analysis stacks (ELK, Graylog, Loggly, Splunk, etc).  This can be done a multitude of ways, in this post I want to focus on modifying log4j2 so that it sends directly to an rsyslog server.

Even though we focus on sending to an Ubuntu ryslog server in this post, this could be any entity listening for syslog traffic, such as Logstash.

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