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Bitcoin Full Node on AWS Free Tier

Provisioning

• Launch one T2 micro instance, using Ubuntu 18 AMI (Ubuntu 20 and 22 not supported ppa)
• Open SSH and Bitcoin Protocol TCP ports: 22, 8333.
• Attach 40GB EBS (General-Purpose SSD) volume for blockchain storage to /dev/sdf. Note: we need larger EBS now (eg. 800GB)

https://aws.amazon.com/blogs/compute/how-to-mount-linux-volume-and-keep-mount-point-consistency/

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol";

contract NftStaker {
    IERC1155 public parentNFT;

    struct Stake {

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From theme: Programming

Microservices for Java Developers: A Hands-On Introduction to Frameworks and Containers

http://www.oreilly.com/programming/free/files/microservices-for-java-developers.pdf
http://www.oreilly.com/programming/free/files/microservices-for-java-developers.epub
http://www.oreilly.com/programming/free/files/microservices-for-java-developers.mobi

Modern Java EE Design Patterns

http://www.oreilly.com/programming/free/files/modern-java-ee-design-patterns.pdf
http://www.oreilly.com/programming/free/files/modern-java-ee-design-patterns.epub
http://www.oreilly.com/programming/free/files/modern-java-ee-design-patterns.mobi

Object-Oriented vs. Functional Programming

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A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

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Git Cheat Sheet

Initial Setup

Initialize a repo

Create an empty git repo or reinitialize an existing one

$ git init