Welcome to ARK Core v3
Technology Stack
Directory Structure
Data Models
Cryptography
Architecture
Application Lifecycle
Service Container
Service Provider
Managers and Drivers
Contracts
Services
Attributes
Cache
Events
Filesystem
Logging
Mixins
Pipeline
Queue
Schedule
Triggers
Validation
Understanding the Lifecycle
Understanding the Nonce
Transaction Types
Overview
Transfer
2nd Signature Registration
Delegate Registration
Vote / Unvote
Multisignature Registration
Ipfs
Multipayment
Delegate Resignation
HTLC
Entity
Introduction
Requirements
Configuring Core
Environment Variables
Using the Install Script
Installing from Source
Docker on Linux/macOS
Docker on Windows
Security Through Obscurity
Staying Up-to-Date
Using SSH
Installing Fail2Ban
Setting Up Port Knocking
Applying iptables
Cloudflare DDoS Protection
Core Run Modes
Core CLI Commands
Starting a Relay
Starting a Forger
Using Snapshots
Creating Factories
Launching a Testnet
Launching a Block Explorer
Using the Core-Tester-CLI
Creating Event Emitters
Creating API Servers
Implementing Milestones
Using Docker
Core CLI
Available Commands
Creating Commands
dApps
Authoring Core dApps
Modeling the Structure
Creating a Module
Plugins
Authoring Plugins
Managing Plugins
Custom Transactions
Authoring Transaction Types
Defining the Structure
Implementing the Builder
Implementing the Handler
Loading the dApp
Running the Example
Introduction
Using the Sandbox
Testing Plugins
Testing Transactions
2.0
2.0 Release Guide
2.0 Upgrade Guide
2.1
2.1 Release Guide
2.1 Upgrade Guide
2.2
2.2 Release Guide
2.2 Upgrade Guide
2.3
2.3 Release Guide
2.3 Upgrade Guide
2.4
2.4 Release Guide
2.4 Upgrade Guide
2.5
2.5 Release Guide
2.5 Upgrade Guide
2.6
2.6 Release Guide
2.6 Upgrade Guide
3.0
3.0 Release Guide
3.0 Upgrade Guide
3.0 Upgrade Guide (Docker)
3.8.2
3.8.2 Release Guide
3.8.2 Upgrade Guide
3.13 to Node.js 24
Upgrade Guide
Troubleshooting
Security Vulnerabilities
Contact Us

Staying Up-to-Date

The first thing we’re going to do is make sure we have the latest security updates for Ubuntu.

1sudo apt-get update
2sudo apt-get upgrade -y

Some updates, like a new kernel, only take effect after a reboot. Ubuntu creates /var/run/reboot-required when that is the case:

1[ -f /var/run/reboot-required ] && sudo reboot

Automatic Security Updates

Ubuntu ships with unattended-upgrades, which installs security updates automatically every day. Make sure it is installed and enabled:

1sudo apt-get install -y unattended-upgrades

file: /etc/apt/apt.conf.d/20auto-upgrades

1APT::Periodic::Update-Package-Lists "1";
2APT::Periodic::Unattended-Upgrade "1";
3APT::Periodic::AutocleanInterval "7";
1sudo systemctl enable --now unattended-upgrades

By default only packages from the security pocket are upgraded, and the server is never rebooted automatically. We recommend keeping it that way for a forger, so you can plan reboots and make sure it comes back online. You can check what would be upgraded with:

1sudo unattended-upgrade --dry-run --debug

Information

Kernel updates still need a reboot. If you want to avoid that, Canonical Livepatch applies critical kernel fixes to a running system. It is part of Ubuntu Pro, which is free for personal use on a limited number of machines: sudo pro attach <token> && sudo pro enable livepatch.

Warning

cron-apt is no longer recommended. Remove it if you set it up before, so it does not run alongside unattended-upgrades: sudo apt-get purge cron-apt.
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