We'll look at two more advanced techniques that can help provide useful debugging information. The first of these is a log tail; this is a buffer of the last few log messages before some significant event. The idea is to have a small file that can be read to show why an application died. It's a bit like having the OS tail command automatically applied to the full log output.
The second technique uses a feature of the logging framework to send log messages through a network to a centralized log-handling service. This can be used to consolidate logs from a number of parallel web servers. We need to create both senders and receivers for the logs.
