Published in Crypto DevOps Academy·4 days agoMember-onlyEFVault hacking, a post-mortem of a Solidity attackIn late February 2023, an attack on Shata Capital’s EFVault project (https://shatacapital.com) was carried out, leading to the theft of approximately $5.1 million. In this story, we will do a post-mortem of this attack and understand what could have been done to prevent it. The transaction that was used in…Security2 min readSecurity2 min read
Published in Crypto DevOps Academy·4 days agoMember-onlyDYNA hacking, a post-mortem of a Solidity attackOn 22/02/2023, an attack on the Dynamic Finance project on the BSC network, using the $DYNA token, was carried out, which led to the theft of 74 BNB. In this story, we will do a post-mortem of this attack and understand what could have been done to prevent it. With…Security2 min readSecurity2 min read
Published in Crypto DevOps Academy·4 days agoMember-onlyAlibaba Cloud, the companion for blockchain projectsIf China is known for not being favorable towards blockchains, having banned trading and mining, this impression can be misleading if you look closer. In reality, Web3 is well established in China, but in a different way than one might imagine. Indeed, NFTs are very developed and the country has…Blockchain Technolgy4 min readBlockchain Technolgy4 min read
Published in Crypto DevOps Academy·Feb 5Member-onlyCalculate the size of a Solidity smart contract (with Hardhat Contract Sizer)This story explains how to automatically calculate the size of a Solidity smart contract to help optimize contracts. The hardhat-contract-sizer plugin (https://www.npmjs.com/package/hardhat-contract-sizer) from Hardhat allows to calculate the size of a Solidity smart contract. To use this plugin, we will: Create a Hardhat project, Create a smart contract, Install and…Solidity2 min readSolidity2 min read
Published in Open DevOps Academy·Jan 12Member-onlyQuick Cheat Sheet: GroovyIn this story, I provide a quick Cheat Sheet for the Groovy language: basic, variables, methods, classes, branching, loops, lists and maps, operators. Basics To create a Hello World application: println "Hello world" To add a single line comment: // This is my single line comment To add multi lines comment: …DevOps4 min readDevOps4 min read
Published in Open DevOps Academy·Jan 6Member-onlyLiveness & readiness probes in KubernetesIn this story, I talk about liveness & readiness probes in Kubernetes : Liveness and readiness probes, Examples, Best practices. Liveness and readiness probes Liveness probes are used to determine if a container is running as expected. If it fails, the container is restarted. Readiness probes are used to determine when a container is…Cloud3 min readCloud3 min read
Published in Crypto DevOps Academy·Jan 5Member-onlyQuick cheatsheet about AnsibleIn this story, I provide a quick cheatsheet about Ansible: playbook, inventory, ad-hoc commands, modules, templates, full example of a playbook. Playbook Ansible playbooks are used to automate tasks across multiple hosts. Basic playbook: --- - hosts: all tasks: - name: Install the apache package yum: name: httpd state: latest Execute…Cloud3 min readCloud3 min read
Published in Crypto DevOps Academy·Jan 4Member-onlyQuick cheatsheet of Linux commandsIn this story, I provide a quick sheet of basic Linux commands : file management, user management, system administration, network administration. File management ls lists files and directories in the current directory. Example : ls -l cp copies a file from one location to another. Example: cp file1.txt file2.txt mv moves a…Cloud1 min readCloud1 min read
Published in Open DevOps Academy·Jan 4Member-onlyQuick cheatsheet of Docker & Docker ComposeIn this story, I propose a quick cheatsheet of Docker : basic commands, storage commands, volume commands, network commands, advanced commands, management commands. And a quick cheatsheet of Docker Compose : basic commands, service management commands, image commands, run commands. Docker Basics commands Pull a Docker image from a repository: docker pull <image> …Cheatsheet2 min readCheatsheet2 min read
Published in Open DevOps Academy·Dec 8, 2022Member-onlyHow to monitor a AWS S3 + CloudFront solutionAmazon CloudFront is a Content Delivery Network (CDN) service that enables content to be delivered worldwide with low latency and high transfer speed. In this story, I explain the different ways to monitor a solution based on AWS S3 & a CloudFront distribution : usage monitoring, metrics monitoring, logs monitoring, …Cloud4 min readCloud4 min read
