This chapter has built the base for monitoring, logging, and log collection. In this chapter, we talked about the monitoring concepts, and how we can setup Nagios and Ganglia for monitoring. We also discussed how the structure of the configuration files is, and how they can be segregated into various sections for the ease of use.

Using this as a baseline, we will move on to understand the Hadoop services, the ports used by Hadoop, and then configure monitoring for them in the upcoming chapters of this book.

In the next chapter, we will deal with the Hadoop daemons and services.