Chapter 2. Troubleshooting Active Processes
A deeper understanding of the underlying active processes in CentOS 7 is an essential skill for any troubleshooter. From high load averages to slow response times, system overloads to dead and dying processes, there comes a time when every server may start to feel sluggish, act impoverished, or fail to respond, and as a consequence, it will require your immediate attention.
In this chapter, we will:
- Learn about memory management, swap, swappiness, and thrashing
- Learn how to analyze active processes using the
vmstat,top, andpscommands - Learn how to monitor the server with
iotop,iostat, andlsof - Learn about system load and
systemd - Learn how to find process IDs, identify parent process IDs and orphaned processes, and initiate the various forms of the
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