Devops Concepts

DevOps Concepts

Continuous Deployment

• When a branch is merged, the feature is automatically deployed to production

Continuous Delivery

• When a branch is merged, the feature is deployed to staging. Something (like a person reviewing the code/staging app) will trigger the deploy to production

Continuous Integration

• Every commit triggers a build process that includes running tests and other automatic checks.

12 Factor App Service Discovery

Patterns

• Circuit Breaker Pattern
• Sidecar Pattern

Helm Charts

yaml/yml

• YMAL ain't markup language
• A data serialization language meant to be easily written and read by humans

Bash

• Born again shell

Docker

• Docker is a platform that allows technologists to develop, deploy and run applications in containers.
• An image is set of executable files that contains everything that is needed to run an application including the code, the dependencies, .env, and configuration files
• A container runs on Linux. It takes only the amount of memory necessary to run the tech in the image, so it takes up less room than a VM.
• Running instance of an image is a container.
• A Dockerfile defines what goes on in the environment inside your container.

Kubernetes (Sarah's Talk)

• Open Source System to deploy, scale and manage containerized systems
• Problems K8 solves:
  • apps and services that are available 24/7
  • developers want to deploy multiple times per day
  • use cloud resources effeciently via container orchestration
  • fault-tolerant, self-healing
  • scalability

Kubernetes Architecture

• Cluster
• Master nodes
  • Have control over everything that is in the cluster
• Worker nodes
  • Houses your containers and applications
• Kublet
  • Brain of the node
• Pod
  • A set of one or more containers that act as a unit and are scheduled onto a VM together.
  • A pod can have nginx, and your app as different containers but work together in a pod