Nginx basics nginx got master and workerprocess master will be who starting the process worker user will be in user directive To see master and worker use ps -ef — forest to validate conf use nginx -t Reverse proxy (proxy_bypass) to pass IP of client to backend conf below server { listen…

DNS basics DNS uses port 53. Normaly UDP to query, sometimes TCP for zone transfers To find local DNS resolver , use site like https://browserleaks.com/ip www.google.com = .com(root domain, .google.com secondary domain) …

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OAUTH — Delegated Authorization protocol. Basically you want to expose your permissions(scopes) of your resource(api) to outside world. You need a resource(contacts.google.com) permissions(read,update etc) and identity ( accounts.google.com) OPENID — Built on top of OAUTH as people are using OAUTH for AUTHENTICATION. When calling resource server, scope set to OPENID and resource server will return ID_TOKEN (AUTHENTICATION) along with ACCESS_TOKEN(AUTHORIZATION)

Fundamentals of various topics Design Patterns https://refactoring.guru/design-patterns Networking LoadBalancer Vs proxy https://blog.envoyproxy.io/introduction-to-modern-network-load-balancing-and-proxying-a57f6ff80236 https://gokube.io/media/Diving-Deep-Into-Kubernetes-Networking.pdf Kubernetes network deep dive: Did you make the right choice? Kubernetes networking design can be intimidating, especially when you are the one to make decisions for cluster-level…itnext.io

Option1: Application code will access keyvault through keyvault API’s. KeyValut config values are created as secrets in k8 and getting exposed var clientId = stageOneConfig.GetValue<string>("clientid"); var clientSecret = stageOneConfig.GetValue<string>("clientsecret"); var keyVaultIdentifier = stageOneConfig.GetValue<string>("keyvaultidentifier"); var keyVaultUri = $"https://{keyVaultIdentifier}.vault.azure.net/";

Golden Ring principle from book “start with why?” For company , success receipt as follows Capital People Market But may fail. If u follow below order What — you know what u doing in your job or profession How — few know how Why — many don’t know purpose How to become success . Invert or Reverse the order. Cause driven and strong believe Why — why are we doing this How — What — Start with why?

Be proactive ( not be reactive — they will focus on uncontrollable things and lose focus. So be proactive ) Beginning with the end in mind (what you want to see yourself in the end) Put first things first Think win-win Seek first to understand and then to be understood (Don’t literally reply. Identify their need?) Synergy — Combination of two things (both entity will be different and combine to form a new thing)

About basic object relationship Association one to one one to many many to one many to many Classification Aggregation Composition Aggregation ( weak — both objects can live independent. Has a relationship) Student + Department Bank + Employee Composition (Part of — object will have part of other object and dependent. Part of relationship) Book + Library Car + Engine Aggregation vs Composition Dependency: Aggregation implies a relationship where the child can exist independently of the parent. For example, Bank and Employee, delete the Bank and the Employee still exist. whereas Composition implies a relationship where the child cannot exist independent of the parent. Example: Human and heart, heart don’t exist separate to a Human