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CKAD studying - application design and build

Container Images * image - lightweight, standalone file containing all the software and executables needed to run a container * allows us to package the application to run in a container * Dockerfile - defines what is contained in an image (using Docker) * image is built from the Dockerfile with docker build -

CKAD studying - application deployment

Deployments * deployment - Kubernetes object that defines a desired state for a set of replica Pods using a Pod template * Kubernetes actively maintains that desired state by creating/deleting/replacing those Pods * Pod template provides the Pod configuration that the Deployment will use to create new Pods * replicas field sets

CKAD studying - application observability and maintenance

API Deprecation Policy * read up on Kubernetes API -> https://kubernetes.io/docs/concepts/overview/kubernetes-api/ * deprecation - process of providing advanced warning of changes to the API, giving consumers time to update their code/processes * read up on the deprecation policy -> https://kubernetes.io/docs/reference/

CKAD studying - application environment, configuration, and security

Custom Resource Definitions (CRD) * custom resource - an extension of the Kubernetes API, allows you to define your own custom Kubernetes object types and interact with them * custom resource definition - defines a custom resource * you can also create custom controllers that act on custom resources (not in CKAD) * you

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(