标签：#ha

I've added Remote Runbooks to RebootX, a mobile app for managing cloud and on-prem infrastructure, available on iOS and Android (freemium). The idea is simple: when PagerDuty wakes you up, many incidents boil down to executing the same sequence of SSH commands or operational steps. Instead of opening a laptop, you can execute a predefined runbook directly from your phone. Very usefyl when you're on the go. The scripts are retrieved from the server at `/usr/local/sbin/rebootx/runbooks`, also via

If you’ve ever built or interacted with DeFi protocols, you know the mathematical limitations of Constant Product Market Makers ($x \times y = k$). While AMMs are great for retail liquidity, executing a large transaction (e.g., $100,000+) directly against a liquidity pool triggers two major issues: Severe Slippage: The marginal price of the asset degrades exponentially relative to the trade size. MEV Exploitation (Sandwich Attacks): Public mempool transactions are highly vulnerable. Front-running bots will buy the asset ahead of your execution block, push the price up to your maximum slippage limit, and dump it immediately after. To solve this without relying on centralized, custodial desks or risky off-chain escrow setups, we built Typelex —a decentralized, non-custodial P2P OTC protocol. Here is a look at how we bypassed the AMM bonding curve entirely using on-chain atomic swaps. The Architecture of an On-Chain Atomic Swap Instead of routing trades through active liquidity pools, Typelex utilizes isolated smart contracts to execute peer-to-peer trades. The entire swap happens atomically : either all conditions are met within a single block execution, or the entire transaction reverts. Conceptual Smart Contract Logic (Solidity-based) To understand how the trustless escrow works under the hood, here is a simplified mental model of the swap execution logic: struct Order { address maker; address taker; // address(0) if public address tokenA; uint256 amountA; address tokenB; uint256 amountB; bool active; } mapping(uint256 => Order) public orders; function takeOrder(uint256 orderId) external { Order storage order = orders[orderId]; require(order.active, "Order not active"); if (order.taker != address(0)) { require(msg.sender == order.taker, "Unauthorized taker"); } order.active = false; // Pull Token B from Taker to Maker IERC20(order.tokenB).transferFrom(msg.sender, order.maker, order.amountB); // Push Token A from Contract Escrow to Taker IERC20(order.tokenA).transfer

Hi all, I've just launched Leet Robotics: a platform to learn robotics hands-on, with a full ROS2 workspace that runs in the browser (Jazzy, Gazebo Harmonic, Foxglove, VS Code) - no install required. The platform also has room for sharing projects and simulation assets as it grows. Our first course is live now: Intro to ROS2 (free to read). The course teaches skills ranging from building your first node to a capstone project of a robot touring a museum world, with every lesson runnable in the on