remote-system-maintenancelisted

# Remote System Maintenance ## Purpose Structured guidance for diagnosing and maintaining remote Linux systems through SSH/tmux sessions, with emphasis on Ubuntu/Debian platforms. ## Applicable Scenarios - System maintenance tasks - Disk space recovery - Package updates - Health diagnostics - Cleanup operations on remote servers ## Three-Phase Approach ### Phase 1: Initial Diagnostics Capture baseline system state: - Hostname and system identification - Resource utilization (disk, memory, CPU) - Process status and load - Zombie process detection ### Phase 2: System Log Review Examine system health indicators: - Recent error messages in system logs - Journal disk consumption analysis - Critical service status - Authentication and security events ### Phase 3: Package Assessment Identify maintenance opportunities: - Upgradable packages - Orphaned configurations - Unused dependencies - Package cache size ## Ubuntu/Debian Cleanup Sequence Execute these seven stages in order: 1. **Package Cache Refresh** - `apt update` to sync package lists 2. **System Upgrades** - `apt upgrade` for security and bug fixes 3. **Orphan Removal** - `apt autoremove` to clean unused dependencies 4. **Cache Purging** - `apt clean` to reclaim package cache space 5. **Journal Pruning** - `journalctl --vacuum-time=7d` to limit log retention 6. **Snap Revision Cleanup** - Remove disabled snap revisions (see below) 7. **Temporary Directory Assessment** - Review `/tmp` and `/var/tmp` for cleanup