What is a Docker Image?
Docker, IMAGE, EK, READ-ONLY, TEMPLATE, hai, JISME, APPLICATION, CODE, RUNTIME, LIBRARIES, ENVIRONMENT, VARIABLES, aur, CONFIG, FILES, SAB, KUCH, INCLUDE, hota hai.
JAB, TUM, EK, IMAGE, se, CONTAINER, RUN, karte, ho, TO, Docker, IMAGE, ke, UPAR, EK, THIN, WRITABLE, LAYER, ADD, kar, deta hai — IMAGE, KHUD, HAMESHA, UNCHANGED, (immutable), rehti hai.
# Docker Hub se ek image pull karo
docker pull nginx:latest
# Local images dekho
docker images
# Ek image se multiple containers run kar sakte ho
docker run -d --name web1 nginx
docker run -d --name web2 nginx- Image = read-only template, container = running instance of image
- Image mein code, runtime, libraries aur config sab kuch hota hai
- Ek image se multiple independent containers ban sakte hain
Docker, Hub, PAR, "Official, Images" (jaise, nginx, node, postgres) Docker, ki, TEAM, YA, TRUSTED, PARTNERS, MAINTAIN, karte, HAIN, aur, REGULARLY, SECURITY, PATCHES, milte, HAIN. Community, images, KOI, BHI, USER, UPLOAD, kar, sakta hai — INKI, QUALITY, aur, SECURITY, VARY, karti hai.
HAR, image, ka, EK, UNIQUE, SHA256, DIGEST, hota, hai — YE, IMAGE, ke, CONTENT, ka, CRYPTOGRAPHIC, HASH, hai. Tags, (jaise, "latest") CHANGE, ho, sakte, HAIN, LEKIN, DIGEST, HAMESHA, EK, EXACT, IMMUTABLE, VERSION, ko, POINT, karta hai.
docker images --digests
docker pull nginx@sha256:abc123... # Exact version pull karo, tag ke bajay