ACL Preparation questions and answers| A+ solutions

ACL Preparation questions and answers| A+ solutions Why would you change a monolithic service to a microservice? (1) Scalability (2) Resources spread easily What is a container image? - an unchangeable, static file that includes executable code so it can run an isolated process on IT infrastructure 00:33 01:39 What is a container registry? - allows you to store, manage and secure your container image Features: ~ Vulnerability ~ Scanning ~ Containers tags and automated build triggers What are kubernetes? an open source system for automated deployment, scaling and management of containerized applications What is a microservice? (1) Architectural style that structures applications as a collection of loosely coupled services (2) Improved modularity (3) Makes applications easier to develop and test (4) Enables small autonomous deployments and test (5) Allows continuous refracting of individual services What are some limitations of Monolithic applications? - Agility - Scalability - DevOps Cycle - Availability, fault tolerance and resiliency What are Feature Flag? - Decision point ion your code that can change the behavior of your applications What is a blue/green deployment? (1) Flip switch type deployment (2) Not deleted immediately What are the six deployment strategies and explain each? (1) Recreate -- Version A is terminated then Version B is rolled out (2) Ramped -- Version B is slowly rolled out and replacing Version A (3) Blue/Green -- Version B is released alongside Version A, then the traffic is switched to Version B (4) Canary -- Version B is released to a subset of users, then proceed to a full rollout (5) A/B Testing -- Version B is released to a subset of users under specific condition (6) Shadow -- Version B received real-world traffic alongside Version A and doesn't impact the response What are some pros/cons of Blue/Green strategy? Pros: - Instant rollout and rollback - Avoiding version conflicts Cons: - Difficult for stateful applications - Long running transactions What are some pros/cons of canary? Pros: - New version only released to a subset of users - Tryouts under production conditions - Fast and easy rollback - Zero down time Cons: - Difficult for stateful applications - Slow What is an unbreakable pipeline? -- prevents bad code from impacting real end users 00:02 01:39 What is self-healing? - Ability for smart auto remediation that addresses the root cause of a problem and not the symptom What is shift left and shift right approaches? Shift Left: - Ability to pull data for specific entities through automation API and feed it into the tools that are used to decide on whether to stop the pipelines or keep it running - Ability to push deployment information and meta data to your monitoring environment Shift-Right: - When its deployed, they're going to monitor, observe, analyze log data and test in production How did we manage traffic output? - Request attributes - SLN, LTN, LSN - HTTP Request Header Names: DT_TEST What are the Kubernetes deployment components? - Replica Set - Services - Nodes - Namespaces - Virtual service gateway - Destination route Where does the container image up? - Container image is defined within the deployment and a replica set What is the difference between readiness and liveliness? -- Readiness: accept incoming transactions -- Liveliness: life state of a given container What are some features of istio? - Load Balancer - Fault Injection What is a virtual service? - where we define the weight for the network traffic What does a Istio service entry provide? -- allows communications outbound from services that are running within the environment How do we communicate with Dynatrace? API How do you import the API into the operator? Secret Files, allows you to store token Why would you use the DT variables? For... - tagging - global variables which can be seen from Dynatrace What did the performance signature plugin do for us? - Performance values - Performance requirements - Performance report What is the difference between ansible job and ansible template? -- Template: the basic definition -- Job: when a template runs with actual values What is a captain? - pipelines are becoming complex, captain is seeking to eliminate that problem What are the features of Istio? - Traffic Routing - Intelligent Load Balancing - Security - Circuit Breaking - Fault Injection What are the components of Istio? - Gateway - Virtual Service - Destination Rule - Service Entity