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 opportunities

Snap Revision Cleanup Technique

Snap keeps old revisions by default. To identify and remove:

# List all disabled snap revisions
snap list --all | awk '/disabled/{print $1, $3}'

# Remove specific revision
snap remove <package-name> --revision=<revision-number>

Important: Requires explicit removal by revision number, not simple package uninstallation.

Documentation Requirements

All maintenance sessions must generate structured logs recording:

1. •

   System Identification

   • •Hostname
   • •OS version
   • •Kernel information
   • •Operator identity
2. •

   Resource States

   • •Initial disk/memory/CPU usage
   • •Final disk/memory/CPU usage
   • •Quantified improvements
3. •

   Actions Taken

   • •Specific commands executed
   • •MB/GB freed per category
   • •Packages upgraded/removed
4. •

   Follow-up Recommendations

   • •Remaining issues
   • •Future maintenance needs
   • •Monitoring suggestions

Expected Results

Real-world recovery examples:

• •Journal vacuuming: 300-600 MB
• •Snap revision cleanup: 500 MB to 2 GB
• •Package cache purging: 100-500 MB
• •Total potential: 2+ GB in comprehensive sessions

Time Commitment

Typical maintenance session: 15-30 minutes including diagnostics, cleanup, and documentation.