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crazylion lee

facebooknuclide/atom-in-orbit: Putting Atom in the browser - 0 views

github.com/...atom-in-orbit

atom browser

shared by crazylion lee on 02 Jan 17 - No Cached
  • crazylion lee on 02 Jan 17
     
    "Putting Atom in the browser"
crazylion lee

Nix: The Purely Functional Package Manager - 0 views

nixos.org/nix

nix homebrew package management

shared by crazylion lee on 28 May 16 - No Cached
  • crazylion lee on 28 May 16
     
    "Nix The Purely Functional Package Manager Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. It provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user package management and easy setup of build environments. Read more…"
張 旭

MySQL :: MySQL 5.7 Reference Manual :: 19.1.1.2 Group Replication - 0 views

dev.mysql.com/...group-replication-summary.html

mysql HA system database replication

shared by 張 旭 on 19 Mar 17 - No Cached
  • The replication group is a set of servers that interact with each other through message passing.
  • The communication layer provides a set of guarantees such as atomic message and total order message delivery.
  • a multi-master update everywhere replication protocol
  • ...8 more annotations...
  • a replication group is formed by multiple servers and each server in the group may execute transactions independently
  • Read-only (RO) transactions need no coordination within the group and thus commit immediately
  • any RW transaction the group needs to decide whether it commits or not, thus the commit operation is not a unilateral decision from the originating server
  • when a transaction is ready to commit at the originating server, the server atomically broadcasts the write values (rows changed) and the correspondent write set (unique identifiers of the rows that were updated). Then a global total order is established for that transaction.
  • all servers receive the same set of transactions in the same order
  • The resolution procedure states that the transaction that was ordered first commits on all servers, whereas the transaction ordered second aborts, and thus is rolled back on the originating server and dropped by the other servers in the group. This is in fact a distributed first commit wins rule
  • Group Replication is a shared-nothing replication scheme where each server has its own entire copy of the data
  • MySQL Group Replication protocol
張 旭

一位开发者的 Linux 容器之旅 - 51CTO.COM - 0 views

developer.51cto.com/...497798.htm

docker linux container system development devops

shared by 張 旭 on 22 Nov 15 - No Cached
  • 容器是一个 Linux 进程，Linux 认为它只是一个运行中的进程。该进程只知道它被告知的东西。
  • 容器进程也分配了它自己的 IP 地址
  • 操作系统被所有容器所共享，减少了容器足迹的重复和冗余。每个容器只包括该容器特有的部分
  • ...26 more annotations...
  • 可以在容器管理器上运行命令，使容器 IP 映射到主机中能访问公网的 IP 地址。建立了该映射，无论出于什么意图和目的，容器就是网络上一个可访问的独立机器，从概念上类似于虚拟机。
  • 容器是拥有不同 IP 地址从而使其成为网络上可识别的独立 Linux 进程
  • 容器/进程以动态、合作的方式共享主机上的资源。
  • 容器能非常快速地启动
  • 和典型虚拟机的静态方式不同。所有这些资源的共享都由容器管理器来管理。
  • 获得了虚拟机独立和封装的好处，而抛弃了静态资源专有的缺陷
  • 托管容器的计算机运行着被剥离的只剩下主要部分的某个 Linux 版本
  • Ubuntu Snappy
  • Red Hat Atomic Host
  • CoreOS
  • 在容器化方面，容器进程有它自己的 IP 地址。一旦给予了一个 IP 地址，该进程就是宿主网络中可识别的资源
  • 一个容器组件被称为层（layer）
  • 层是一个容器镜像
  • 容器管理器只提供你所要的操作系统在宿主操作系统中不存在的部分
  • 在容器配置文件中重新定义层
  • 容器的各种功能都由一个称为容器管理器（container manager）的软件控制
  • Docker
  • Rocket
  • 镜像存储在注册库（registry）中，注册库通过网络访问
  • 注册库类似于一个使用 Java 的人眼中的 Maven 仓库、使用 .NET 的人眼中的 NuGet 服务器。
  • 容器管理器会封装你应用程序的所有东西为一个独立容器，该容器将会在容器管理器的管理下运行在宿主计算机上。
  • 每个容器有一个独立的 IP 地址
  • 在一个负载均衡容器后运行容器集群以获得更高的性能和高可用计算
  • Deis 的容器配置技术
  • 每次添加实例到环境中时，你不需要手动配置负载均衡器以便接受你的容器镜像。
  • 使用服务发现技术让容器告知均衡器它可用
張 旭

一位开发者的 Linux 容器之旅-技术 ◆ 学习|Linux.中国-开源社区 - 1 views

linux.cn/article-6594-1.html

linux docker container system development devops

shared by 張 旭 on 22 Nov 15 - No Cached
  • 容器是一个 Linux 进程，Linux 认为它只是一个运行中的进程。该进程只知道它被告知的东西。
  • 容器进程也分配了它自己的 IP 地址。
  • 在容器化方面，容器进程有它自己的 IP 地址。一旦给予了一个 IP 地址，该进程就是宿主网络中可识别的资源
  • ...20 more annotations...
  • 使容器 IP 映射到主机中能访问公网的 IP 地址。建立了该映射，无论出于什么意图和目的，容器就是网络上一个可访问的独立机器，从概念上类似于虚拟机。
  • 容器是拥有不同 IP 地址从而使其成为网络上可识别的独立 Linux 进程
  • CPU、内存和存储空间的分配是动态的，和典型虚拟机的静态方式不同。所有这些资源的共享都由容器管理器来管理。
  • 容器能非常快速地启动
  • 托管容器的计算机运行着被剥离的只剩下主要部分的某个 Linux 版本。
  • 操作系统被所有容器所共享，减少了容器足迹的重复和冗余。每个容器只包括该容器特有的部分
  • 层是一个容器镜像
  • 一个容器组件被称为层（layer）
  • 容器的各种功能都由一个称为容器管理器（container manager）的软件控制
  • 流行的容器管理器是 Docker 和 Rocket
  • 镜像存储在注册库（registry）中，注册库通过网络访问
  • 镜像代表了你的容器需要完成其工作的容器模板
  • 应用程序所需镜像的容器配置文件
  • 每个容器有一个独立的 IP 地址。因此，能把它放到负载均衡器后面。将容器放到负载均衡器后面，这就上升了一个层面。
  • Deis 的容器配置技术
  • 可以部署一个或多个容器镜像到主机上的负载均衡器下
  • 每次添加实例到环境中时，你不需要手动配置负载均衡器以便接受你的容器镜像。你可以使用服务发现技术让容器告知均衡器它可用。
  • 类似 CoreOS、RHEL Atomic、和 Ubuntu 的 Snappy 宿主操作系统
  • 类似 Docker 和 Rocket 的容器管理技术结合起来
  • 类似 Deis 这样的配置技术使容器创建和部署变得更加简单
張 旭

How services work | Docker Documentation - 0 views

docs.docker.com/...services

docker swarm cluster system

shared by 張 旭 on 07 Sep 18 - No Cached
  • a service is the image for a microservice within the context of some larger application.
  • When you create a service, you specify which container image to use and which commands to execute inside running containers.
  • an overlay network for the service to connect to other services in the swarm
  • ...13 more annotations...
  • In the swarm mode model, each task invokes exactly one container
  • A task is analogous to a “slot” where the scheduler places a container.
  • A task is the atomic unit of scheduling within a swarm.
  • A task is a one-directional mechanism. It progresses monotonically through a series of states: assigned, prepared, running, etc.
  • Docker swarm mode is a general purpose scheduler and orchestrator.
  • Hypothetically, you could implement other types of tasks such as virtual machine tasks or non-containerized process tasks.
  • If all nodes are paused or drained, and you create a service, it is pending until a node becomes available.
  • reserve a specific amount of memory for a service.
  • impose placement constraints on the service
  • As the administrator of a swarm, you declare the desired state of your swarm, and the manager works with the nodes in the swarm to create that state.
  • two types of service deployments, replicated and global.
  • A global service is a service that runs one task on every node.
  • Good candidates for global services are monitoring agents, an anti-virus scanners or other types of containers that you want to run on every node in the swarm.
張 旭

What are Docker : images? - Project Atomic - 0 views

www.projectatomic.io/...at-are-docker-none-none-images

docker system

shared by 張 旭 on 18 Sep 18 - No Cached
  • Now we understand what these <none>:<none> images stand for. They stand for intermediate images and can be seen using docker images -a
  • They don’t result into a disk space problem but it is definitely a screen real estate problem
  • dangling images
  • ...7 more annotations...
  • Another style of <none>:<none> images are the dangling images which can cause disk space problems.
  • In programming languages like Java or Golang a dangling block of memory is a block that is not referenced by any piece of code.
  • a dangling file system layer in Docker is something that is unused and is not being referenced by any images.
  • intermediate images
  • do docker images and see <none>:<none> images in the list, these are dangling images and needs to be pruned.
  • These dangling images are produced as a result of docker build or pull command.
  • docker rmi $(docker images -f "dangling=true" -q)
張 旭

How To Create a Kubernetes Cluster Using Kubeadm on Ubuntu 18.04 | DigitalOcean - 0 views

www.digitalocean.com/...-using-kubeadm-on-ubuntu-18-04

cluster ubuntu kubernetes system

shared by 張 旭 on 27 Mar 19 - No Cached
  • A pod is an atomic unit that runs one or more containers.
  • Pods are the basic unit of scheduling in Kubernetes: all containers in a pod are guaranteed to run on the same node that the pod is scheduled on.
  • Each pod has its own IP address, and a pod on one node should be able to access a pod on another node using the pod's IP.
  • ...12 more annotations...
  • Communication between pods is more complicated, however, and requires a separate networking component that can transparently route traffic from a pod on one node to a pod on another.
  • pod network plugins. For this cluster, you will use Flannel, a stable and performant option.
  • Passing the argument --pod-network-cidr=10.244.0.0/16 specifies the private subnet that the pod IPs will be assigned from.
  • kubectl apply -f descriptor.[yml|json] is the syntax for telling kubectl to create the objects described in the descriptor.[yml|json] file.
  • deploy Nginx using Deployments and Services
  • A deployment is a type of Kubernetes object that ensures there's always a specified number of pods running based on a defined template, even if the pod crashes during the cluster's lifetime.
  • NodePort, a scheme that will make the pod accessible through an arbitrary port opened on each node of the cluster
  • Services are another type of Kubernetes object that expose cluster internal services to clients, both internal and external.
  • load balancing requests to multiple pods
  • Pods are ubiquitous in Kubernetes, so understanding them will facilitate your work
  • how controllers such as deployments work since they are used frequently in stateless applications for scaling and the automated healing of unhealthy applications.
  • Understanding the types of services and the options they have is essential for running both stateless and stateful applications.
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