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A Cloud Guru

Troubleshooting CPU Utilization

The ability to diagnose and resolve issues on a Linux system is a skill that every administrator needs to cultivate. In this lab, we cover using various reporting and monitoring utilities to troubleshoot issues with CPU utilization on the system.

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Path Info

Level

Intermediate

Duration

30m

Published

Mar 13, 2020

Challenge

Install the Monitoring and Reporting Utilities (`sysstat`)
Install the sysstat package using the following commands:
```
sudo -i
yum install -y sysstat
```

Challenge

Use the Monitoring and Reporting Utilities to Diagnose the Issue

This is a list of possible steps to take to find the source of the issue. Not all of them are required.

free -h
df -h
vmstat 1 4
iostat -y 1 3
iostat -cy 1 3
top <-- locate PID(s) that are taking up a large amount of CPU (gzip and cat)

Use the PIDs to discover the parent process ID (PPID) that spawned them and copy the offending script to /home/cloud_user/.

ps -ef | egrep "PID|PID" <-- You can grep for each individual PID (egrep saves a step) 
pstree -p (PID of kaladin.sh) <-- shows process tree in a visual format
cp /root/kaladin.sh /home/cloud_user/

Challenge

Terminate the Offending Process
Once the PID of the offending process has been located (kaladin.sh), use the kill command to terminate it.
```
kill -15 PID
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.