yuval.guide — Guides and hands-on courses on DevOps, cloud, Linux, Python, Kubernetes, networking and AI.

The slides The lesson is twenty-six slides in five sections, after an introduction. Every slide uses the same network: two PCs and a switch, a router, and a web server and a DNS server behind a second switch. Introduction: the network, and the three messages the lesson follows (a ping, a DNS lookup, a web request). 1. …

The slides The lab is twenty-three slides in three parts, after an introduction, one step each, with the steps to follow beside a capture, a terminal or the network. Introduction: what the lab does, and what it needs. 1. Capturing on your computer Start a capture: Wireshark's interfaces, and tcpdump. Capture a ping: to …

The slides The tour is seven slides in three sections, after an introduction, each a screenshot of Wireshark with numbered marks that the text beside it explains. The main window: the window's five parts, and the packet list's columns. A packet's layers: one line per header in the packet details, and the IPv4 header …

The slides The tool is forty-two slides in five sections, after an introduction: Introduction: object storage beside block and file storage. 1. Buckets and objects: the bucket name as an ID, reaching a bucket over HTTPS, the object, tags on S3 and on every AWS resource, durability and consistency, object sizes and S3's …

The slides The tool is twenty-five slides: an introduction, then five sections, listed on its left. 0. Introduction IAM: identification, authentication, authorization: what IAM is, and the three steps every request goes through. 1. Identification The identities in an account: the root user, and the users, groups and …

The slides The tool is twelve slides, one picture each: Regions around the world: every Region on the map, coloured by partition. One Region: Israel (Tel Aviv): its AZs, its code, opt-in Regions, choosing a Region. A real Availability Zone, from the air: part of an AZ of us-west-2. The distance between Availability …

The slides The tool is a hands-on guide in seventeen slides, one step each, with the steps to follow beside a screenshot, a terminal or a picture of IAM's users and groups: Introduction: what the guide makes, and with which tool. 1. The account The AWS account: what it holds, its 12-digit ID, its card, and why …

The three roles In every OpenID Connect sign-in, a user wants to log in to an app, and the app lets a third party, the provider, say who the user is. The same three roles, whoever plays them: OpenID Provider: The party holding the identities and signing the token. It publishes its public keys at a fixed address, so …

The slides The tool is eleven slides, one picture each: Three ways into AWS: the console, the CLI and the SDKs send the same signed request. The AWS account: what it holds, its 12-digit ID, signing up, the bill. Signing in to the console: the root user and an IAM user. The console's top bar: the Services menu, search, …

An address and a prefix length divide 32 bits in two: the network bits, left of the prefix, and the host bits right of it. Splitting a network moves that line to the right. The workspace, at the top, holds one address: type its decimal values, flip its bits, and move its barriers. Under it, Original Network shows the …