AgentSkillsCN

linux-fundamentals-skill

涵盖进程管理、文件系统、权限、软件包管理、用户、Bash脚本和系统监控的完整Linux管理技能

SKILL.md
--- frontmatter
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:
  - name: distro
    type: string
    required: false
    default: "ubuntu"
    validation: "^(ubuntu|debian|centos|rhel|fedora|arch)$"
  - name: operation
    type: string
    required: true
    enum: ["process", "filesystem", "permissions", "package", "user", "script", "monitor"]

retry_config:
  strategy: exponential_backoff
  initial_delay_ms: 1000
  max_retries: 3

observability:
  logging: structured
  metrics: enabled

Linux Fundamentals Skill

Overview

Master Linux system administration - the foundation of DevOps.

Parameters

NameTypeRequiredDefaultDescription
distrostringNoubuntuTarget distribution
operationstringYes-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

bash
# 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

SymptomRoot CauseSolution
Permission deniedInsufficient privilegesUse sudo or check ownership
Command not foundPackage not installedInstall with apt/dnf
No space leftDisk fullClean /var/log, docker prune
High loadCPU/IO bottleneckUse 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