App Log Streaming
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By binding an application to an instance of an applicable service, Cloud Foundry will stream logs for the bound application to the service instance.
- Logs for all apps bound to a log-consuming service instance will be streamed to that instance
- Logs for an app bound to multiple log-consuming service instances will be streamed to all instances
To enable this functionality, a service broker must implement the following:
In the catalog endpoint, the broker must include
requires: syslog_drain. This minor security measure validates that a service returning a
syslog_drain_urlin response to the bind operation has also declared that it expects log streaming. If the broker does not include
requires: syslog_drain, and the bind request returns a value for
syslog_drain_url, Cloud Foundry will return an error for the bind operation.
In response to a bind request, the broker should return a value for
syslog_drain_url. The syslog URL has a scheme of syslog, syslog-tls, or https and can include a port number. For example:
How does it work?
- Service broker returns a value for
syslog_drain_urlin response to bind
- Loggregator periodically polls an internal Cloud Controller endpoint for updates
- Upon discovering a new
syslog_drain_url, Loggregator identifies the associated app
- Loggregator streams app logs for that app to the locations specified by the service instances’
Users can manually configure app logs to be streamed to a location of their choice using User-provided Service Instances. For details, see Using Third-Party Log Management Services.