Readings: AWS: Cloud Servers
Review, Research, and Discussion
- Describe the Web-Request-Response-Cycle
- The request/response cycle traces how a user’s request flows through the app. Understanding the request/response cycle is helpful to figure out which files to edit when developing an app (and where to look when things aren’t working).
- A user opens his browser, types in a URL, and presses Enter.
- When a user presses Enter, the browser makes a request for that URL.
- The request hits the Rails router (config/routes.rb). The router maps the URL to the correct controller and action to handle the request.
- The action receives the request and passes it on to the view.
- The view renders the page as HTML.
- The controller sends the HTML back to the browser. The page loads and the user sees it.
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- What does it mean to “deploy” an application?
- Deploying your application means putting it on a Web server so that it can be used either through the Internet or an intranet.
- Explain what a “server” is, as it relates to the WRRC
- First a user gives a client a URL, the client builds a request for information (or resources) to be generated by a server. When the server receives that request, it uses the information included in the request to build a response that contains the requested information. Once built, that response is sent back to the client in the requested format, to be rendered to the user.
- It is our job as web developers to build out and maintain servers that can successfully build responses based on standardized requests that will be received. But, what does a standard request look like? We need to know that before we can start building servers that will respond successfully.
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Vocabulary
- Server
- In computing, a server is a piece of computer hardware or software that provides functionality for other programs or devices, called “clients”. This architecture is called the client–server model.
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- Pub/Sub
- Is an asynchronous messaging service that decouples services that produce events from services that process events.
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- WRRC
- The request/response cycle traces how a user’s request flows through the app. Understanding the request/response cycle is helpful to figure out which files to edit when developing an app (and where to look when things aren’t working).
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Preparation
- Virtual Machine
- What is a virtual machine?
- A Virtual Machine (VM) is a compute resource that uses software instead of a physical computer to run programs and deploy apps. One or more virtual “guest” machines run on a physical “host” machine. Each virtual machine runs its own operating system and functions separately from the other VMs, even when they are all running on the same host. This means that, for example, a virtual MacOS virtual machine can run on a physical PC.
- Virtual machine technology is used for many use cases across on-premises and cloud environments. More recently, public cloud services are using virtual machines to provide virtual application resources to multiple users at once, for even more cost efficient and flexible compute.
- How do virtual machines work?
- The virtual machine runs as a process in an application window, similar to any other application, on the operating system of the physical machine. Key files that make up a virtual machine include a log file, NVRAM setting file, virtual disk file and configuration file.
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- What is a virtual machine?
- VMS
- Is a multi-user, multiprocessing virtual memory-based operating system designed to support time-sharing, batch processing, transaction processing and workstation applications. It was first announced by Digital Equipment Corporation as VAX/VMS (Virtual Address eXtension/Virtual Memory System) alongside the VAX-11/780 minicomputer in 1977. OpenVMS has subsequently been ported to run on DEC Alpha systems, the Itanium-based HPE Integrity family of computers, and select x86-64 hardware and hypervisors.Since 2014, OpenVMS is developed and supported by a company named VMS Software Inc. (VSI).
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The system offers high availability through clustering and the ability to distribute the system over multiple physical machines, allowing clustered applications and data to remain continuously accessible while operating system software and hardware maintenance and upgrades are performed, or when a whole data center is destroyed. VMS cluster uptimes of up to 17 years have been reported. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide.
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| Read | Title | ToGo |
|---|---|---|
| Read: 01 | Pre-Work - Code 401: Advanced Javascript Development |  |
| Read: 02 | Readings: Express | |
| Read: 03 | Readings: Express REST API | |
| Read: 04 | Readings: Data Modeling | |
| Read: 06 | Readings: Authentication | |
| Read: 07 | Reading: Bearer Authorization | |
| Read: 08 | Reading: Access Control (ACL) | |
| Read: 09 | Reading: OAuth 2 | |
| Read: 11 | Readings: Event Driven Applications | |
| Read: 12 | Readings: Socket.io | |
| Read: 13 | Readings: Message Queues | |
| Read: 14 | Readings: Event Driven Architecture | |
| Read: 16 | Readings: AWS: Cloud Servers | |
| Read: 17 | Readings: AWS: S3 and Lambda | |
| Read: 18 | Readings: AWS: API, Dynamo and Lambda | |
| Read: 18 | Readings: AWS: Events | |
| Read: 26 | Reading: Component Based UI | |
| Read: 27 | Reading: Props and State | |
| Read: 28 | Readings: Component Composition | |
| Read: 29 | Readings: Routing | |
| Read: 31 | Reading: Hooks API | |
| Read: 32 | Reading: Custom Hooks | |
| Read: 33 | Reading: Context API | |
| Read: 34 | Reading: <Login /> and <Auth /> |
|
| Read: 36 | Reading: Application State with Redux | |
| Read: 37 | Readings: Redux - Combined Reducers | |
| Read: 38 | Readings: Redux - Asynchronous Actions | |
| Read: 39 | Readings: Redux - Additional Topics | |