system-admin

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• SKILL.md

SKILL.md (first lines)

# System Administration

Server health checks, Docker management, log analysis, and network diagnostics via shell commands.

## When to Use

- "Check server status"
- "How much disk space is left?"
- "Is the Docker container running?"
- "Show me the logs for X"
- "Why is the server slow?"
- "Check memory / CPU usage"
- "Network connectivity issue"

## System Health Checks

### Disk Usage

```bash
# Overview of all mounted filesystems
df -h

# Disk usage of current directory, sorted by size
du -sh * | sort -rh | head -20

# Find large files (>100MB)
find / -size +100M -type f 2>/dev/null | xargs ls -lh | sort -k5 -rh | head -20

# Inode usage (important for many small files)
df -i
```

### Memory

```bash
# Memory overview
free -h

# Detailed memory info
cat /proc/meminfo | grep -E "MemTotal|MemFree|MemAvailable|SwapTotal|SwapFree"

# Top memory consumers
ps aux --sort=-%mem | head -15

# Memory usage by process name
ps aux | awk '{print $4, $11}' | sort -rn | head -10
```

### CPU

```bash
# CPU info
nproc
cat /proc/cpuinfo | grep "model name" | head -1

# Current CPU usage (snapshot)
top -bn1 | grep "Cpu(s)"

# Top CPU consumers
ps aux --sort=-%cpu | head -15

# Load average (1m, 5m, 15m)
uptime

# Detailed per-core stats
mpstat -P ALL 1 3 2>/dev/null || vmstat 1 3
```

### System Overview

```bash
# Uptime and load
uptime

# OS and kernel info
uname -a
cat /etc/os-release

# Logged-in users
who

# Running processes count
ps aux | wc -l

# Open file descriptors
lsof | wc -l 2>/dev/null
```

## Docker Management

### Container Status

```bash
# All containers (running + stopped)
docker ps -a

# Running containers with resource usage
docker stats --no-stream

# Container details
docker inspect <container_name_or_id>

# Container logs (last 100 lines)
docker logs --tail 100 <container>

# Follow logs in real time
docker logs -f <container>

# Logs with timestamps
docker logs --timestamps --tail 50 <container>
```

### Container Operations

```bash
# Start / stop / restart
docker start <container>
docker stop <container>
docker restart <container>

From ez2k/claude-channel-hub, MIT.

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