Lecture #04 - 02/04/2019¶
- Assignment #01 review
- Kubernetes Objects
- Stateless Services
- Liveness Probe
- Service Discovery
- Assignment #02 discussion
- Labels and Selectors
- Configure Liveness and Readiness Probes
- NodePort Service
- External Load Balancer - Inject Data using Environment Variables
- Readiness Probe
Registries, Repositories, Images, and Tags¶
There is a hierarchical system for storing images. The following terminology is used:
A service responsible for hosting and distributing images. The default registry is the Docker Hub.
A collection of related images (usually providing different versions of the same application or service).
An alphanumeric identifier attached to images within a repository (e.g., 14.04 or stable ). So the command
docker pull tomcat:latest will download the image tagged latest within the
tomcat repository from the Docker Hub registry.