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linux-fundamentals-skill

@pluginagentmarketplace/custom-plugin-devops
2
0

Complete Linux administration skill covering process management, filesystem, permissions, package management, users, bash scripting, and system monitoring.

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SKILL.md

name linux-fundamentals-skill
description Complete Linux administration skill covering process management, filesystem, permissions, package management, users, bash scripting, and system monitoring.
sasmp_version 1.3.0
bonded_agent 01-devops-fundamentals
bond_type PRIMARY_BOND
parameters [object Object], [object Object]
retry_config [object Object]
observability [object Object]

Linux Fundamentals Skill

Overview

Master Linux system administration - the foundation of DevOps.

Parameters

Name Type Required Default Description
distro string No ubuntu Target distribution
operation string Yes - Operation category

Core Topics

MANDATORY

  • Process lifecycle and management (ps, top, kill)
  • Filesystem hierarchy and operations
  • File permissions (chmod, chown, ACLs)
  • Package management (apt, yum, dnf)
  • User and group administration
  • Basic bash scripting

OPTIONAL

  • LVM and disk partitioning
  • Systemd service management
  • Log analysis with journalctl

ADVANCED

  • Kernel parameters and sysctl
  • SELinux/AppArmor security
  • Performance profiling

Quick Reference

# Process Management
ps aux | grep [p]rocess          # Find process (avoid grep itself)
kill -15 PID                      # Graceful termination
kill -9 PID                       # Force kill (last resort)
pkill -f pattern                  # Kill by pattern
nohup command &                   # Background immune to hangup

# File Permissions
chmod 755 file                    # rwxr-xr-x
chmod u+x,g+r file               # Symbolic notation
chown -R user:group dir/         # Recursive ownership
setfacl -m u:user:rw file        # Set ACL

# Package Management (Debian/Ubuntu)
apt update && apt upgrade -y
apt install -y package
apt autoremove

# Package Management (RHEL/CentOS)
dnf update -y
dnf install package

# User Management
useradd -m -s /bin/bash user
usermod -aG sudo user
passwd user

# System Info
uname -a                          # Kernel info
cat /etc/os-release              # OS version
free -h                           # Memory usage
df -h                             # Disk usage

Troubleshooting

Common Failures

Symptom Root Cause Solution
Permission denied Insufficient privileges Use sudo or check ownership
Command not found Package not installed Install with apt/dnf
No space left Disk full Clean /var/log, docker prune
High load CPU/IO bottleneck Use top, iotop

Debug Checklist

  1. Check permissions: id, ls -la
  2. Check disk: df -h, du -sh /*
  3. Check memory: free -h
  4. Check logs: journalctl -xe

Recovery Procedures

Out of Disk Space

  1. Find large files: du -sh /* | sort -rh | head
  2. Clean cache: apt clean
  3. Rotate logs: journalctl --vacuum-size=100M

Resources