11.2.3 Resource Monitoring Facts

What is the goal of resource monitoring?

To track system conditions, identify problems, prevent issues, and ensure resources perform optimally.

What does ABRT stand for?

Automatic Bug Reporting Tool.

What is the purpose of ABRT?

It helps detect, analyze, report, and resolve application crashes.

What does ABRT do when a system crash occurs?

It collects system data, creates backtraces, generates reports, creates bug tickets, and suggests fixes.

What is gnome-abrt?

A GUI application used for ABRT problem management and reporting.

What is libreport in ABRT?

A library that provides an API for reporting problems to email, bugzilla, faf, and other destinations.

Where are ABRT notifications sent by default?

To the root user on the local machine.

What is faf in ABRT?

A crash-collecting server that gathers reports and helps identify known issues.

What does satyr do in ABRT?

It analyzes failures, processes stack traces, generates reports, and sends them remotely.

What are µReports?

Small machine-readable crash reports containing system and stack trace information without private data.

How do you install ABRT command-line tools?

yum install abrt-cli

How do you install the ABRT GUI?

yum install abrt-desktop

What does abrt-cli list do?

It lists all crashes on the machine.

What may need to be enabled before using abrt-cli list?

Autoreporting using abrt-auto-reporting enabled

What does abrt-cli list -d do?

It displays detailed report data about a specific problem.

What does abrt-cli report do?

It reports a specific problem.

What does abrt-cli remove do?

It deletes a problem report.

What file displays detailed CPU information?

/proc/cpuinfo

What information does uptime display?

Current time, system uptime, logged-in users, and load averages.

What do load averages represent?

The average number of instructions waiting for CPU time.

What does a load average of 1 mean on a single CPU system?

The CPU is fully utilized and keeping up with demand.

What does a load average greater than 1 mean?

The CPU has more work than it can handle in real time.

What package provides the sar command?

The sysstat package.

What does the sar command monitor?

CPU, memory, swap, I/O, devices, and network statistics.

What does sar -P ALL do?

It shows statistics for each processor and global CPU statistics.

What does sysctl do?

It views and changes kernel parameters at runtime.

How do you view all kernel parameters with sysctl?

sysctl -a

What command reports memory, paging, block I/O, and CPU activity?

vmstat

What file stores detailed memory usage statistics?

/proc/meminfo

What command shows free and used physical and swap memory?

free

What does free -m do?

It displays memory usage in megabytes.

What does the OOM killer do?

It kills processes when the system is critically low on memory.

How does the OOM killer choose which process to kill?

It assigns badness scores and kills the process with the highest score.

How can you check if the OOM killer terminated a process?

dmesg | grep -i "killed process"

What is the difference between buffers and cache?

Buffers are active I/O waiting to be written; cache is completed I/O data already stored.

What does dmidecode do?

It displays DMI/SMBIOS hardware information like serial numbers and BIOS version.

What does lshw do?

It provides detailed hardware configuration information for the system.