K8's/TS/Http/MVC/MSA/AJAX Flashcards by Hunter Rose

A ________ tool helps in deployment, scaling, networking, and monitoring of your containers.

container orchestration

How well did you know this?

Not at all

Perfectly

It provides a framework for managing containers and the microservices they contain at scale.

Container Orchestration

How well did you know this?

Not at all

Perfectly

____ is a container orchestration tool.

Kubernetes

How well did you know this?

Not at all

Perfectly

It provides tools that help deploy and manage containers that run over a network.

Kubernetes

How well did you know this?

Not at all

Perfectly

It lets us build application services that span multiple containers, schedule containers across a cluster, scale those containers, and manage their health over time.

Kubernetes

How well did you know this?

Not at all

Perfectly

Similar tools to Kubernetes

Docker Swarm and Apache Mesos

How well did you know this?

Not at all

Perfectly

K8s Architecture

Cluster
Node
Pod
Containers

How well did you know this?

Not at all

Perfectly

Primary node agent interacts with master node

Kubelet

How well did you know this?

Not at all

Perfectly

Software that runs containers

Container runtime

How well did you know this?

Not at all

Perfectly

Network proxy maintains network rules on nodes

Kube-proxy

How well did you know this?

Not at all

Perfectly

Cmd line tool for k8s

Allows you to interact with the API in the master node to deploy and manage your cluster

Kubectl

How well did you know this?

Not at all

Perfectly

Lets you query and manipulate the state of objects in K8s

API

How well did you know this?

Not at all

Perfectly

Local k8s

Minikube

How well did you know this?

Not at all

Perfectly

Azure K8s Service

AKS

How well did you know this?

Not at all

Perfectly

Container runtime

Docker

How well did you know this?

Not at all

Perfectly

Deploying with k8s

Object config file
Pods
Deployments
Services

How well did you know this?

Not at all

Perfectly

Superset of JS, which means that all valid JS is valid ____

JS flavor that imposes type checking and “compile” time errors

Statically typed

CANNOT IN ITSELF BE RUN IN THE BROWSER HAS TO BE TRANSPILED BEFORE IT’S EXECUTED (using node.js and tsc)

Still JS under the hood

Typescript

How well did you know this?

Not at all

Perfectly

All valid JS types are TS types

True

How well did you know this?

Not at all

Perfectly

(TS type) literally any type, when you assign something to any, you are resigning to JS’s type inference system (i.e. letting JS take the wheel and infer the type for you)

Any

How well did you know this?

Not at all

Perfectly

a type safe any. Ensures someone using the type declares what the type is

Unknown

How well did you know this?

Not at all

Perfectly

a function that returns undefined or no return value. Like how you’d use void as a return type in C#

Void

How well did you know this?

Not at all

Perfectly

what’s the difference between js classes and ts classes

TS classes have access modifiers

How well did you know this?

Not at all

Perfectly

Modules in ts

Works like a JS module but has some additional support

Import multiple modules from a single script file, only import types (type safe way of importing)

This helps in organizing your code in their own files and using them in different places

So you expose something for use using the export keyword and you use that something in another file using the import keyword

Any declaration (variable, function, class, type alias, interface) can be exported by adding the export keyword before the type keyword.

How well did you know this?

Not at all

Perfectly

Stands for Asynchronous Javascript and XML, More of technique than a specific technology

AJAX

How well did you know this?

Not at all

Perfectly

An older implementation of AJAX Object that is used to send a request to the server and receive the response Again the XML in its name is for traditional reasons

XMLHttpRequest

Newer JS native implementation of AJAX

Fetch API

Uses promises to achieve asynchronisity

Fetch API

_____ represent the eventual completion (or failure) of an asynchronous operation and its resulting value

Promises

____ are objects in JS

Promises

what does MSA stand for?

Micro Service Architecture

Monolithic vs SOA vs MSA

``` monolithic = single unit SOA = coarse-grained microservices = fine-grained ```

Microservice Characteristics

SRP (single responsibility principle) Encapsulated Independent

MSA pros

``` Scalability Deployment Simplicity Fault tolerant Testability Language agnostic ```

MSA cons

Complexity Monitoring Eventual consistency Chattiness

what does MVC stand for?

model view controller

Design pattern used to separate concerns (yes we’re discussing this again)

MVC

a web application framework developed by Microsoft that implements the model–view–controller pattern.

ASP.NET MVC

MVC vs ASP.NET MVC

MVC is a design pattern, ASP.NET MVC is a web app framework that implements the mvc design pattern

Send from client to server

HTTP request

what are the 3 parts to and http request

Start line Method - describes action to be performed Target - describes where to send the request Header Meta data Ex: content type - what data type the body has Body Data you want the server to process

Describes what action the client wants the server to perform on a given resource

HTTP verbs/methods

Get resource

HTTP GET

Create a new resource

HTTP POST

Update resource

HTTP PUT

Delete resource

HTTP DELETE

Returns just the headers of a get response

HTTP HEAD

what are the less common http verbs?

connect, options, trace, patch

A method is said to be safe if it does not change the state of the resource (Ex: HTTP GET, HTTP HEAD)

Safe methods

A method is said to be ______ if the state of the resource is only affected once by any changes implemented by this method

idempotent

examples of idempotent methods

DELETE, PUT, HEAD, GET

From server to client

HTTP Response

what are the 3 parts to an HTTP Response

Status line Headers Body

errors that are the client’s fault, client side errors (“Your fault”)

4xx

errors that are the server’s fault, server side errors (“My bad”)

5xx

redirection (“We moved that”)

3xx

communicating success (“Success”)

2xx

informational (“Mkay”)

1xx

____ give a short description of whether an interaction is successful or not.

Status codes

Bad request, generic error message

400

Payment Required

402

Not found

404

Method not allowed (if server does not support method)

405

Internal Server Error, try again later we’re having problems right now

500

Not Implemented, if a method isn’t implemented (if it’s under construction)

501

Bad Gateway

502

what does dns stand for?

Domain Name System (DNS)

_______ translates domain names to IP addresses so browsers can load Internet resources.

DNS

Used to describe a group of queries that are executed as a batch that should completely succeed or not have any effect on the database at all

Transactions

Sublanguage to control Transactions

TCL

TCL commands

Commit Savepoint Rollback

what does ACID stand for?

Atomic Consistent Isolation Durable

All or nothing Either the transaction completely succeeds without errors and persists to a non volatile data storage system or it fails

Atomic

Guarantees committed transaction state Makes sure that your transaction is not half finished Consistency is a property ensuring that only valid data following all rules and constraints is written in the database. When a transaction results in invalid data, the database reverts to its previous state, which abides by all customary rules and constraints.

Consistent

guarantees the individuality of each transaction, and prevents them from being affected from other transactions. It ensures that transactions are securely and independently processed at the same time without interference, but it does not ensure the order of transactions. Two transactions, affecting same data, one will have to wait

Isolation

A transaction isn’t considered complete until it is persisted in a non volatile data storage; by that it means your device could turn off and the data would still be saved

Durable

_____ define the degree to which a transaction must be isolated from the data modifications made by any other transaction in the database system

Isolation levels

Ways other transactions can affect your transaction:

Dirty Read non-repeatable read phantom read

when your transaction reads uncommitted updates done by another transaction

Dirty Read

when your transaction reads committed updates done by another transaction

Non Repeatable Read

some rows may be added or removed due to the updates done by another transaction

Phantom Read

Does not protect transaction from anything, your transaction can read uncommitted data from other transactions Useful for when you read and write all the time, like netflix, or if you’re tracking number of covid cases, you can just reload

Read uncommitted (zero isolation)

Protects transaction from dirty read but not from non repeatable read. Meaning you can still read committed data from other transactions. Locks updates unless committed SQLServer Default

Read committed

Protects transaction from non repeatable read but not from phantom read. When querying batches of data you’d still be able to get a different set of rows when you query the table before and after updates from another table occur Locks row

Repeatable read

Protects transaction from phantom read. Congratulations. You’ve reached the highest isolation level. This guarantees total isolation. It’s essentially locking the data set you’re working with from other transactions.

Serializable