This document provides a high-level overview of Kubernetes in under 30 minutes. It begins with basic concepts like nodes, pods, replica sets, deployments, and services. It then covers additional concepts like secrets, config maps, ingress, daemon sets, pet sets/stateful sets and services. The document aims to explain the main components of Kubernetes and how they work together at a high level to deploy and manage container-based applications.
Dockerをちゃんと使おうと考えていたらKubernetesに出会いました。ERPのシステム開発でkubernetesを使おうとして苦労した、あるいは現在進行形で苦労していることを、そもそもKubernetesが解決しようとしている課題やそのアーキテクチャそのものにも言及しながらお話します。Dockerをベースにシステム設計を行おうとしている方にノウハウ(主に苦労話)を共有します。
July 24th, 2016 July Tech Festa 2016
WalB: Real-time and Incremental Backup System for Block Devicesuchan_nos
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WalB is an open-source backup system that consists of block devices, called WalB devices, and userland utilities, called WalB tools. A WalB device records write-I/Os. WalB tools extracts them to create restorable snapshots in an incremental manner.
Compared with dm-snap and dm-thin, WalB is designed to achieve small I/O latency overhead and short backup time. We conducted an experiment to take an incremental backup of a volume under random write workload. The result confirms those advantages of WalB.
Cybozu cloud platform, which has 500TB volumes and processes 25TB write-I/Os per day, is required to achieve (1) stable workload performance without I/O spikes which may affect application user experience and (2) short backup interval specified in our service level objective. WalB satisfies the requirements, while dm-snap is not enough to and dm-thin is not expected to.
This document summarizes a talk given about Flowtype, a static type checker for JavaScript. The talk discussed how Flowtype allows for strong type inference in React.js projects, checks propTypes statically, and is fast. While Flowtype is not a language itself and just a type checker, its type annotations use a colon instead of TypeScript's angle brackets. The speaker was eager for Flowtype's continued development, as its documentation and support for contributing were still incomplete.