backup-client

A containerized SSH backup server built on Alpine Linux, designed to provide secure remote backup access using SSH/SFTP protocols.

Features

🔐 Secure SSH Access: Automated SSH server setup with configurable authentication
🐳 Docker Ready: Multi-architecture support (linux/amd64, linux/arm64)
📦 BorgBackup Integration: Built-in backup solution support
⚙️ Dynamic Configuration: Real-time SSH config monitoring and reloading
🔄 CI/CD Pipeline: Automated builds via Drone CI

Quick Start

docker run -p 20022:20022 -v /backup/data:/home/backup safebox/backup-client

Configuration

Environment Variables

Variable	Default	Description
SSH_PORT	20022	SSH server listening port
SSH_USER	backup	Backup user name
SSH_PASSWORD	backup	User password for authentication

How it Works

The container automatically:

User Setup: Creates the backup user with configured credentials SSH Configuration: Generates host keys (Ed25519) if not present Server Start: Launches SSH daemon

Key Components

Dockerfile: Alpine-based image with OpenSSH, su-exec, and BorgBackup start_backup.sh: Main entrypoint script handling SSH setup .drone.yml: CI/CD pipeline for multi-architecture builds

Security Features Host Key Persistence: SSH host keys are generated once and persisted Configurable Authentication: Supports both password and public key authentication User Isolation: Runs SSH daemon as non-root user

Development

Development builds: Push to registry.dev.format.hu/backup-client Release builds: Tag events push to safebox/backup-client on DockerHub Multi-architecture: Supports both AMD64 and ARM64 platforms

License

This project is open source. Please check the license file for details.

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