System Guide v1.0.0

Comprehensive guide for managing SLYD at scale, intended for system administrators and advanced users.

System Requirements

Ensure your environment meets these minimum requirements for optimal performance:

Deployment Architectures

SLYD supports various deployment architectures to meet different scaling and availability requirements:

Installation

Below are the steps for a standard installation of the SLYD platform:

Prerequisites

# Update system packages
sudo apt update && sudo apt upgrade -y

# Install required dependencies
sudo apt install -y curl git docker.io docker-compose lxd snapd

# Enable and start Docker
sudo systemctl enable docker
sudo systemctl start docker

# Add current user to Docker group
sudo usermod -aG docker $USER

# Initialize LXD
sudo lxd init --auto

Core Installation

# Clone the SLYD repository
git clone https://github.com/slyd-cloud/slyd-core.git
cd slyd-core

# Configure environment variables
cp .env.example .env
# Edit .env file with your specific configuration

# Build and start services
docker-compose up -d

# Verify installation
curl http://localhost:8080/health

Advanced Configuration

Configuration Files

The main configuration files for SLYD are:

Custom LXD Profiles

You can create custom LXD profiles for specific workload types:

# Example high-performance compute profile
name: high-compute
config:
  limits.cpu: "8"
  limits.memory: 16GB
  limits.processes: "1000"
description: High performance compute profile
devices:
  eth0:
    name: eth0
    nictype: bridged
    parent: lxdbr0
    type: nic
  root:
    path: /
    pool: default
    size: 100GB
    type: disk

Scaling the Platform

As your user base grows, you'll need to scale the platform to handle increased load:

Horizontal Scaling

Add more nodes to your cluster to handle increased workloads:

# On the new node
sudo slyd-node join --token $JOIN_TOKEN --master $MASTER_IP

Vertical Scaling

Upgrade existing nodes with more resources:

1. Shut down the SLYD services: sudo systemctl stop slyd
2. Upgrade hardware (CPU, RAM, storage)
3. Update resource allocations in configuration
4. Restart services: sudo systemctl start slyd

System Monitoring

Implement comprehensive monitoring to ensure system health and performance:

Backup and Recovery

Implement a robust backup strategy to protect data and ensure service continuity:

Backup Strategy

# Automated database backup script
#!/bin/bash
DATE=$(date +%Y-%m-%d)
BACKUP_DIR="/var/backups/slyd/db"

# Create backup directory if it doesn't exist
mkdir -p $BACKUP_DIR

# Backup PostgreSQL database
pg_dump -U slyd -F c slyd_db > $BACKUP_DIR/slyd_db_$DATE.dump

# Compress backup
gzip $BACKUP_DIR/slyd_db_$DATE.dump

# Remove backups older than 30 days
find $BACKUP_DIR -name "*.gz" -mtime +30 -delete
                

# Create snapshots of all LXD containers
#!/bin/bash
DATE=$(date +%Y%m%d)

# Get list of all containers
CONTAINERS=$(lxc list --format csv -c n)

# Create snapshot for each container
for CONTAINER in $CONTAINERS; do
    lxc snapshot $CONTAINER $CONTAINER-$DATE
done

# Remove snapshots older than 7 days
for CONTAINER in $CONTAINERS; do
    SNAPSHOTS=$(lxc info $CONTAINER | grep Snapshots -A1000 | grep -v Snapshots | grep -v "^ *$" | awk '{print $2}')
    for SNAPSHOT in $SNAPSHOTS; do
        SNAPSHOT_DATE=$(echo $SNAPSHOT | cut -d'-' -f2)
        if [ $(date -d "$SNAPSHOT_DATE" +%s) -lt $(date -d "7 days ago" +%s) ]; then
            lxc delete $CONTAINER/$SNAPSHOT
        fi
    done
done
                

Disaster Recovery Plan

1. Identify critical systems and prioritize recovery order
2. Document recovery procedures for each component (database, containers, etc.)
3. Test recovery procedures regularly in a staging environment
4. Define RTO (Recovery Time Objective) and RPO (Recovery Point Objective) for each component
5. Establish communication protocols for outage situations

Security Hardening

Implement these security measures to protect your SLYD deployment:

Common Issues & Troubleshooting

Solutions for frequently encountered issues:

# Check LXD daemon logs
journalctl -u lxd

# Verify resource availability
free -h
df -h

# Check storage pool status
lxc storage list
lxc storage info default

# Restart LXD service
systemctl restart lxd
                    

# Check Cloudflare daemon status
systemctl status cloudflared

# Verify tunnel configuration
cat /etc/cloudflared/config.yml

# Test connectivity to Cloudflare
curl -s https://www.cloudflare.com > /dev/null && echo "Connected" || echo "Failed"

# Restart Cloudflare daemon
systemctl restart cloudflared

# Check logs for errors
journalctl -u cloudflared -n 100
                    

# Check database service status
systemctl status postgresql

# Verify connection parameters
grep "ConnectionString" /opt/slyd/config/appsettings.json

# Test database connection
psql -U slyd -h localhost -p 5432 -d slyd_db -c "SELECT 1"

# Check database logs
tail -n 100 /var/log/postgresql/postgresql-13-main.log

# Restart database service
systemctl restart postgresql
                    

System Upgrades

Follow these procedures for safe system upgrades:

Minor Version Upgrades

# Stop SLYD services
systemctl stop slyd-api
systemctl stop slyd-worker

# Backup configuration
cp -r /opt/slyd/config /opt/slyd/config.bak

# Pull new container images
docker pull slyd/api:latest
docker pull slyd/worker:latest

# Start services with new images
systemctl start slyd-api
systemctl start slyd-worker

# Verify successful upgrade
curl http://localhost:8080/health

Major Version Upgrades

Major upgrades may require database schema migrations and additional steps:

1. Review release notes for breaking changes and migration requirements
2. Perform full backup of all data and configurations
3. Schedule maintenance window and notify users
4. Follow upgrade script provided with the major release
5. Test all functionality after upgrade
6. Have rollback plan ready in case of issues