Set 10

Ubuntu L2-Corporal Industry Assignments

(Set 10 | Index 91–100) Root Working Directory: ~/kactii27

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91. System Boot Performance & Timeline Review

Scenario: Ops needs insight into slow system startups.

Instructions:

• Navigate to ~/kactii27

• Create a folder named boot_analysis

• Inspect system boot time and service startup durations

• Identify slowest units

• Save findings to boot_analysis.txt

Commands Expected: systemd-analyze, systemd-analyze blame, redirection

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92. Journald Log Scope & Filtering Exercise

Scenario: Support must isolate relevant logs from noisy systems.

Instructions:

• Navigate to ~/kactii27

• Create a folder named journald_filter

• Query logs for a specific unit or priority

• Restrict output to a time window

• Save filtered logs to journal_logs.txt

Commands Expected: journalctl, filtering flags, redirection

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93. Service Failure Root-Cause Drill

Scenario: A system service fails to start.

Instructions:

• Navigate to ~/kactii27

• Create a folder named service_failure

• Inspect service status and recent logs

• Identify failure cause (read-only analysis)

• Save findings to service_failure.txt

Commands Expected: systemctl status, journalctl -u, redirection

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94. System Resource Pressure Snapshot

Scenario: System shows degraded performance.

Instructions:

• Navigate to ~/kactii27

• Create a folder named resource_pressure

• Capture CPU, memory, and load snapshot

• Identify pressure points

• Save output to pressure.txt

Commands Expected: uptime, free -h, vmstat, redirection

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95. Swap Usage & Memory Fallback Analysis

Scenario: Memory exhaustion triggers swap usage.

Instructions:

• Navigate to ~/kactii27

• Create a folder named swap_analysis

• Inspect swap configuration and usage

• Observe swap activity under load (controlled)

• Save findings to swap.txt

Commands Expected: swapon --show, free -h, redirection

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96. Service Restart Policy Inspection

Scenario: Services must recover automatically from failures.

Instructions:

• Navigate to ~/kactii27

• Create a folder named restart_policy

• Inspect restart behavior of a service

• Identify restart conditions and limits

• Save output to restart_policy.txt

Commands Expected: systemctl show, grep, redirection

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97. Kernel Message Stream Inspection

Scenario: Hardware or driver issues are suspected.

Instructions:

• Navigate to ~/kactii27

• Create a folder named kernel_messages

• Inspect kernel message buffer

• Filter warnings and errors

• Save output to dmesg.txt

Commands Expected: dmesg, grep, redirection

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98. Persistent vs Runtime Configuration Awareness

Scenario: Configuration changes disappear after reboot.

Instructions:

• Navigate to ~/kactii27

• Create a folder named config_scope

• Identify runtime vs persistent settings

• Inspect relevant config files (read-only)

• Save findings to config_scope.txt

Commands Expected: sysctl, /etc, /proc, redirection

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99. System Capability Boundary Review

Scenario: Security review checks system capability boundaries.

Instructions:

• Navigate to ~/kactii27

• Create a folder named capability_review

• Inspect system-wide and binary capabilities

• Document observed privilege boundaries

• Save output to capabilities.txt

Commands Expected: capsh --print, getcap, redirection

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100. End-to-End Incident Snapshot & Summary

Scenario: Capture a complete diagnostic snapshot during an incident.

Instructions:

• Navigate to ~/kactii27

• Create a folder named incident_snapshot

• Collect system state: processes, memory, disk, network

• Capture timestamps and context

• Save outputs and write a short summary

Commands Expected: ps, top -b -n 1, df -h, ip a, date, redirection

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