8 🌍 Docker Hub

🌍 Docker Hub

📋 Docker Image Formats and Registry Usage

Format	Example	Meaning
Official Image	docker pull ubuntu	Pulls from Docker’s official repo
Username/Image	docker pull ommapari/app	Pulls from a specific Docker Hub user
Private Registry	docker pull 123456789012.dkr.ecr.us-east-1.amazonaws.com/my-app	Pulls from a private registry
With Tag	docker pull nginx:1.23.4	Pulls a specific version
With Digest	docker pull nginx@sha256:xyz	Pulls a fixed image version Why use digests? Guarantees that the pulled image never changes, unlike latest.

Note: Always login before pulling

🚀 Deploy Private Registry and Pull Images

Setting up a Private Registry

docker run -d --name=my-registry -p 5000:5000 --restart always registry:2

Pull and Tag Images

docker pull nginx:latest httpd:latest
 
docker image tag nginx localhost:5000/nginx:latest

View Tagged Images

docker images                  

REPOSITORY           TAG    IMAGE ID    CREATED     SIZE
localhost:5000/nginx      latest  53a18edff809  6 weeks ago   192MB
nginx              latest  53a18edff809  6 weeks ago   192MB

Push to Private Registry

docker image tag nginx localhost:5000/nginx:latest

Query Registry Catalog

curl -X GET localhost:5000/v2/_catalog

{"repositories":["httpd","nginx"]}

Pull from Private Registry

docker pull localhost:5000/nginx

🖼️ Docker Hub Examples

💡 Best Practices

• Always use specific tags instead of latest in production
• Use digests for guaranteed immutable deployments
• Set up private registries for proprietary applications
• Regularly scan images for security vulnerabilities
• Keep images lightweight by using minimal base images
• Use multi-stage builds to reduce final image size