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software-dev

A collection of 21 issues

DVA-C01 studying - KMS

KMS - Key Management Service What it is * https://aws.amazon.com/kms/ * managed service for creating and controlling the encryption keys used to encrypt your data * encryption keys are Single-Region by default * can be multi-tenant * seamless integration with a plethora of AWS services (usually a checkbox in the console

DVA-C01 studying - IAM (Part 2)

IAM - Identity and Access Management Web Identity Federation * simplifies authentication and authorization for web applications * allows users to access AWS services after (successfully) authenticating with a web-based identity provider * provider must be OpenID Connect compatible * authenticate with provider -> successful authentication returns an authentication code from the provider

DVA-C01 studying - CloudWatch and CloudTrail

CloudWatch What is it * https://aws.amazon.com/cloudwatch/ * monitoring service to monitor health and performance metrics of you applications and AWS resources * by default can monitor compute, storage & content delivery, database & analytics, and a variety of other AWS services * can even monitor estimated AWS charges * CloudWatch Agent

easy: balanced brackets

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must

easy: int palindromes

Problem: Given an integer x, return true if x is palindrome integer. An integer is a palindrome when it reads the same backward as forward. using strings num = str(x) head = 0 tail = len(num) - 1 while head < tail: # return false if the values at head and tail

easy: two sum

Problem: Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. Each input has exactly one solution, and you may not use the same element twice. brute force - O(n2) time for i in range(len(

DVA-C01 studying - DynamoDB

DynamoDB What it is * https://aws.amazon.com/dynamodb/ * fast, flexible, fully managed NoSQL database * fast - consistent, single-digit millisecond latency * flexible data model - supports both document (JSON, HTML, and XML) and key-value data models * can be configured to auto-scale * stored on SSD storage * spread across 3 geographically distinct

DVA-C01 studying - Lambda, API Gateway, Step Functions, X-Ray

Serverless Computing What it is * https://aws.amazon.com/serverless/ * allows you to run application code on the cloud without needing to manage a server * AWS handles managing the infrastructure * capacity provisioning * patching * auto scaling * high availability * Advantages * speed to market - no server management overhead * automatic scaling

DVA-C01 studying - S3, CloudFront

S3 - Simple Storage Service What it is * https://aws.amazon.com/s3/ * scaleable, low cost, object storage * cannot run an operating system or database * manages data as objects instead of files or blocks * you can upload any file type * "unlimited" storage in volume and objects count * 5TB

DVA-C01 studying - EC2, EBS, Elastic Load Balancer, RDS, Elasticache, Systems Manager Parameter Store

EC2 - Elastic Compute Cloud What it is * https://aws.amazon.com/ec2/ * a secure, resizable compute capacity in the hosted on AWS * instances are similar to a VM, some differences https://www.alibabacloud.com/topic-center/a/fcsoqejo9rg1-whats-the-difference-between-vms-and-ec2-instances-alibaba-cloud * hosted on AWS, not your own datacenter * can scale capacity on demand