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.
Successfully complete this lab by achieving the following learning objectives:
- Install the Monitoring and Reporting Utilities (`sysstat`)
Install the sysstat package using the following commands:
sudo -i yum install -y sysstat
- 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
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/
- Terminate the Offending Process
Once the PID of the offending process has been located (
kaladin.sh), use the
killcommand to terminate it.
kill -15 PID