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張 旭

1. Introduction · swooletw/laravel-swoole Wiki - 0 views

github.com/...1.-Introduction

php swoole performance

shared by 張 旭 on 24 Apr 19 - No Cached
  • when you run PHP script every time, PHP needs to initialize modules and launch Zend Engine for your running environment. And your PHP script needs to be compiled to OpCodes and then Zend Engine can finally execute them.
  • in traditional PHP lifecycle, it wastes a bunch of time building and destroying resources for your script execution.
  • have a built-in server on top of Swoole, and all the scripts can be kept in memory after the first load
  • 張 旭 on 24 Apr 19
     
    "when you run PHP script every time, PHP needs to initialize modules and launch Zend Engine for your running environment. And your PHP script needs to be compiled to OpCodes and then Zend Engine can finally execute them."
張 旭

Swarm mode key concepts | Docker Documentation - 0 views

docs.docker.com/...key-concepts

docker cluster system server HA

shared by 張 旭 on 16 Jun 17 - No Cached
  • The cluster management and orchestration features embedded in the Docker Engine are built using SwarmKit.
  • Docker engines participating in a cluster are running in swarm mode
  • A swarm is a cluster of Docker engines, or nodes, where you deploy services
  • ...19 more annotations...
  • When you run Docker without using swarm mode, you execute container commands.
  • When you run the Docker in swarm mode, you orchestrate services.
  • You can run swarm services and standalone containers on the same Docker instances.
  • A node is an instance of the Docker engine participating in the swarm
  • You can run one or more nodes on a single physical computer or cloud server
  • To deploy your application to a swarm, you submit a service definition to a manager node.
  • Manager nodes also perform the orchestration and cluster management functions required to maintain the desired state of the swarm.
  • Manager nodes elect a single leader to conduct orchestration tasks.
  • Worker nodes receive and execute tasks dispatched from manager nodes.
  • service is the definition of the tasks to execute on the worker nodes
  • When you create a service, you specify which container image to use and which commands to execute inside running containers.
  • replicated services model, the swarm manager distributes a specific number of replica tasks among the nodes based upon the scale you set in the desired state.
  • global services, the swarm runs one task for the service on every available node in the cluster.
  • A task carries a Docker container and the commands to run inside the container
  • Manager nodes assign tasks to worker nodes according to the number of replicas set in the service scale.
  • Once a task is assigned to a node, it cannot move to another node
  • If you do not specify a port, the swarm manager assigns the service a port in the 30000-32767 range.
  • External components, such as cloud load balancers, can access the service on the PublishedPort of any node in the cluster whether or not the node is currently running the task for the service.
  • Swarm mode has an internal DNS component that automatically assigns each service in the swarm a DNS entry.
crazylion lee

ZuzooVn/machine-learning-for-software-engineers: A complete daily plan for studying to ... - 0 views

github.com/...earning-for-software-engineers

machine learning learning machine

shared by crazylion lee on 11 Nov 16 - No Cached
  • crazylion lee on 11 Nov 16
     
    "A complete daily plan for studying to become a machine learning engineer."
crazylion lee

A Discipline for Software Engineering: Watts S. Humphrey: 9780201546101: Amazon.com: Books - 0 views

www.amazon.com/...0201546108

engineering software books

shared by crazylion lee on 30 Jan 17 - No Cached
  • crazylion lee on 30 Jan 17
     
    "A Discipline for Software Engineering 1st Edition"
crazylion lee

How a Car Engine Works - Animagraffs - 0 views

animagraffs.com/how-a-car-engine-works

engine cars science Technology

shared by crazylion lee on 09 Jun 16 - No Cached
  • crazylion lee on 09 Jun 16
     
    "Did you know that your car will take in 20,000 cubic feet of air to burn 20 gallons of fuel? That's the equivalent of a 2,500 sq. ft. house! If your only experience with a car engine's inner workings is "How much is that going to cost to fix?" this graphic is for you. Car engines are astoundingly awesome mechanical wonders. It's time you learned more about the magic under the hood!"
crazylion lee

Tutorial series: learning how to write a 3D soft engine from scratch in C#, TypeScript ... - 0 views

www.davrous.com/...-in-c-typescript-or-javascript

tutorial series 3d engine

shared by crazylion lee on 10 Jun 16 - No Cached
  • crazylion lee on 10 Jun 16
     
    "Tutorial series: learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript"
crazylion lee

Skia Graphics Library - 0 views

skia.org

graphics library 2D

shared by crazylion lee on 09 Oct 15 - No Cached
  • crazylion lee on 09 Oct 15
     
    "Skia is an open source 2D graphics library which provides common APIs that work across a variety of hardware and software platforms. It serves as the graphics engine for Google Chrome and Chrome OS, Android, Mozilla Firefox and Firefox OS, and many other products. Skia is sponsored and managed by Google, but is available for use by anyone under the BSD Free Software License. While engineering of the core components is done by the Skia development team, we consider contributions from any source. "
張 旭

Template Engine - Templates - Packer by HashiCorp - 0 views

www.packer.io/...engine.html

packer virtualization image devops template engine

shared by 張 旭 on 12 Apr 19 - No Cached
  • All strings within templates are processed by a common Packer templating engine, where variables and functions can be used to modify the value of a configuration parameter at runtime.
  • Anything template related happens within double-braces: {{ }}.
  • Functions are specified directly within the braces, such as {{timestamp}}
  • ...8 more annotations...
  • Template variables are prefixed with a period and capitalized, such as {{.Variable}}.
  • Functions perform operations on and within strings
  • the {{timestamp}} function can be used in any string to generate the current timestamp.
  • pwd - The working directory while executing Packer.
  • template_dir - The directory to the template for the build.
  • uuid - Returns a random UUID.
  • user - Specifies a user variable.
  • Template variables are special variables automatically set by Packer at build time.
crazylion lee

Panopticon - 0 views

panopticon.re

reverse engineering

shared by crazylion lee on 06 Jun 16 - No Cached
  • crazylion lee on 06 Jun 16
     
    "A libre, cross platform disassembler for reverse engineering"
crazylion lee

"Reverse Engineering for Beginners" free book - 0 views

beginners.re

reverse engineering engineering reverse hacking

shared by crazylion lee on 24 Apr 16 - No Cached
  • crazylion lee on 24 Apr 16
     
    "Also known as RE4B. Written by Dennis Yurichev "
張 旭

Deploy services to a swarm | Docker Documentation - 0 views

docs.docker.com/...services

docker swarm system

shared by 張 旭 on 07 Sep 18 - No Cached
  • Swarm services use a declarative model, which means that you define the desired state of the service, and rely upon Docker to maintain this state.
  • To create a single-replica service with no extra configuration, you only need to supply the image name.
  • A service can be in a pending state if its image is unavailable
  • ...12 more annotations...
  • If your image is available on a private registry which requires login, use the --with-registry-auth flag
  • When you update a service, Docker stops its containers and restarts them with the new configuration.
  • When updating an existing service, the flag is --publish-add. There is also a --publish-rm flag to remove a port that was previously published.
  • To update the command an existing service runs, you can use the --args flag.
  • force the service to use a specific version of the image
  • If the manager can’t resolve the tag to a digest, each worker node is responsible for resolving the tag to a digest, and different nodes may use different versions of the image.
  • After you create a service, its image is never updated unless you explicitly run docker service update with the --image flag as described below.
  • When you run service update with the --image flag, the swarm manager queries Docker Hub or your private Docker registry for the digest the tag currently points to and updates the service tasks to use that digest.
  • You can publish a service task’s port directly on the swarm node where that service is running.
  • You can rely on the routing mesh. When you publish a service port, the swarm makes the service accessible at the target port on every node, regardless of whether there is a task for the service running on that node or not.
  • To publish a service’s ports externally to the swarm, use the --publish <PUBLISHED-PORT>:<SERVICE-PORT> flag.
  • published port on every swarm node
張 旭

Production Notes - MongoDB Manual - 0 views

docs.mongodb.com/...production-notes

mongodb database performance

shared by 張 旭 on 29 Apr 21 - No Cached
  • mongod will not start if dbPath contains data files created by a storage engine other than the one specified by --storageEngine.
  • mongod must possess read and write permissions for the specified dbPath.
  • WiredTiger supports concurrent access by readers and writers to the documents in a collection
  • ...9 more annotations...
  • Journaling guarantees that MongoDB can quickly recover write operations that were written to the journal but not written to data files in cases where mongod terminated due to a crash or other serious failure.
  • To use read concern level of "majority", replica sets must use WiredTiger storage engine.
  • Write concern describes the level of acknowledgement requested from MongoDB for write operations.
  • With stronger write concerns, clients must wait after sending a write operation until MongoDB confirms the write operation at the requested write concern level.
  • By default, authorization is not enabled, and mongod assumes a trusted environment
  • The HTTP interface is disabled by default. Do not enable the HTTP interface in production environments.
  • Avoid overloading the connection resources of a mongod or mongos instance by adjusting the connection pool size to suit your use case.
  • ensure that each mongod or mongos instance has access to two real cores or one multi-core physical CPU.
  • The WiredTiger storage engine is multithreaded and can take advantage of additional CPU cores
張 旭

LXC vs Docker: Why Docker is Better | UpGuard - 0 views

www.upguard.com/...docker-vs-lxc

docker container devops

shared by 張 旭 on 28 Jun 21 - No Cached
  • LXC (LinuX Containers) is a OS-level virtualization technology that allows creation and running of multiple isolated Linux virtual environments (VE) on a single control host.
  • Docker, previously called dotCloud, was started as a side project and only open-sourced in 2013. It is really an extension of LXC’s capabilities.
  • run processes in isolation.
  • ...35 more annotations...
  • Docker is developed in the Go language and utilizes LXC, cgroups, and the Linux kernel itself. Since it’s based on LXC, a Docker container does not include a separate operating system; instead it relies on the operating system’s own functionality as provided by the underlying infrastructure.
  • Docker acts as a portable container engine, packaging the application and all its dependencies in a virtual container that can run on any Linux server.
  • a VE there is no preloaded emulation manager software as in a VM.
  • In a VE, the application (or OS) is spawned in a container and runs with no added overhead, except for a usually minuscule VE initialization process.
  • LXC will boast bare metal performance characteristics because it only packages the needed applications.
  • the OS is also just another application that can be packaged too.
  • a VM, which packages the entire OS and machine setup, including hard drive, virtual processors and network interfaces. The resulting bloated mass usually takes a long time to boot and consumes a lot of CPU and RAM.
  • don’t offer some other neat features of VM’s such as IaaS setups and live migration.
  • LXC as supercharged chroot on Linux. It allows you to not only isolate applications, but even the entire OS.
  • Libvirt, which allows the use of containers through the LXC driver by connecting to 'lxc:///'.
  • 'LXC', is not compatible with libvirt, but is more flexible with more userspace tools.
  • Portable deployment across machines
  • Versioning: Docker includes git-like capabilities for tracking successive versions of a container
  • Component reuse: Docker allows building or stacking of already created packages.
  • Shared libraries: There is already a public registry (http://index.docker.io/ ) where thousands have already uploaded the useful containers they have created.
  • Docker taking the devops world by storm since its launch back in 2013.
  • LXC, while older, has not been as popular with developers as Docker has proven to be
  • LXC having a focus on sys admins that’s similar to what solutions like the Solaris operating system, with its Solaris Zones, Linux OpenVZ, and FreeBSD, with its BSD Jails virtualization system
  • it started out being built on top of LXC, Docker later moved beyond LXC containers to its own execution environment called libcontainer.
  • Unlike LXC, which launches an operating system init for each container, Docker provides one OS environment, supplied by the Docker Engine
  • LXC tooling sticks close to what system administrators running bare metal servers are used to
  • The LXC command line provides essential commands that cover routine management tasks, including the creation, launch, and deletion of LXC containers.
  • Docker containers aim to be even lighter weight in order to support the fast, highly scalable, deployment of applications with microservice architecture.
  • With backing from Canonical, LXC and LXD have an ecosystem tightly bound to the rest of the open source Linux community.
  • Docker Swarm
  • Docker Trusted Registry
  • Docker Compose
  • Docker Machine
  • Kubernetes facilitates the deployment of containers in your data center by representing a cluster of servers as a single system.
  • Swarm is Docker’s clustering, scheduling and orchestration tool for managing a cluster of Docker hosts. 
  • rkt is a security minded container engine that uses KVM for VM-based isolation and packs other enhanced security features. 
  • Apache Mesos can run different kinds of distributed jobs, including containers. 
  • Elastic Container Service is Amazon’s service for running and orchestrating containerized applications on AWS
  • LXC offers the advantages of a VE on Linux, mainly the ability to isolate your own private workloads from one another. It is a cheaper and faster solution to implement than a VM, but doing so requires a bit of extra learning and expertise.
  • Docker is a significant improvement of LXC’s capabilities.
張 旭

20 年軟體工程生涯所學到的 20 件事 (摘譯) - Ant ATField - 0 views

blog.gcos.me/...0-years-as-a-software-engineer

architecture programming

shared by 張 旭 on 04 Jun 22 - No Cached
  • 你永遠無法償還所有的技術債、你永遠無法設計出完美的界面、你的測試總是太慢。
  • 這不是一個不把事情做得更好的藉口，而是給你一個視角，不要擔心優雅和完美
  • 有新團隊成員要加入？注意他們在哪裡感到困惑，以及他們問了什麼問題。
  • ...14 more annotations...
  • 軟體是達到目標的手段，而不是目標本身。目標是定向的，但手段要可隨時變通。
  • 不需要維護的程式
  • 10 倍工程師是愚蠢神話。有人能在 1 天內完成另一個有能力、努力工作、有類似經驗的工程師在 2 週內完成的工作，這種想法很愚蠢。
  • 。一個人能夠成為 10 倍工程師的唯一方法，是你把他們和 0.1x 的工程師相比。
  • between a senior engineer and a junior engineer is that they’ve formed opinions about the way things should be
  • 沒有什麼比一個對自己的工具或如何建構軟體沒有意見的資深工程師更讓我擔心了。
  • 如果你正在使用你的工具，而你對它們不愛也不恨，那麼你需要去體驗更多。
  • 你的資料可能會比你的程式長壽。花點精力保持秩序和乾淨
  • 存活下來的老技術是鯊魚，不是恐龍。
  • 軟體工程師應該定期撰寫部落格、日記、文件，總之做任何需要他們保持書面溝通能力之事。
  • 如果你把一個人從他們的工作成果中抽離，他們就會對他們的工作不那麼關心。這也是跨職能團隊運作良好的主要原因，也是 DevOps 變得如此流行的原因。從頭到尾擁有整個過程，並直接負責交付價值。讓一群充滿熱情的人對設計、建構和交付一個軟體 (或任何東西) 擁有完全的自主，這終將發生令人驚奇之事。
  • 面試最好是用來瞭解某人是誰，以及他們對某一專業領域的興趣如何。嘗試找出他們會成為多好的團隊成員是一個沒有結果的努力。
  • 你在建構一個系統的過程中會學到很多東西，你最終會迭代成一個比你當初設計的更好的系統。
  • stop sharpening the saw, and just start cutting shit
crazylion lee

Mapzen Search · Mapzen - 0 views

mapzen.com/search

search gps location

shared by crazylion lee on 16 Oct 15 - No Cached
  • crazylion lee on 16 Oct 15
     
    "Mapzen Search is a search engine for places worldwide, powered by open data. It turns addresses and place names into geographic coordinates, and turns geographic coordinates into places and addresses. With Mapzen Search, you're able to turn your users' place searches into actionable geodata and transform your geodata into real places. "
crazylion lee

Freeablo - 0 views

freeablo.org

opensource diablo

shared by crazylion lee on 12 Nov 16 - No Cached
  • crazylion lee on 12 Nov 16
     
    "A work-in-progress free and open-source replacement for the Diablo I engine. Simply import the Diablo assets, and enjoy the same old game with faster performance and modern resolutions, and first class support for mods."
crazylion lee

Hammerspoon - 0 views

www.hammerspoon.org

automation lua osx mac

shared by crazylion lee on 24 Nov 16 - No Cached
  • crazylion lee on 24 Nov 16
     
    "This is a tool for powerful automation of OS X. At its core, Hammerspoon is just a bridge between the operating system and a Lua scripting engine. What gives Hammerspoon its power is a set of extensions that expose specific pieces of system functionality, to the user."
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