Summary - Build

Combine build, tag and .dockerignore to create an image.

Summary: build

In this group:

docker build -t name:tag [-f Dockerfile] context produces an image.
A tag is a pointer; fixed version tags are used in production.
The context is sent to the daemon; files outside it can't be accessed.
Layers are cached; everything after a changed layer is rebuilt. Rarely changing steps are written at the top.
.dockerignore shrinks the context and keeps secret files out.

docker build --pull -t api:1.2.0 -t api:latest .
docker history api:1.2.0

Write three commands: build api:1.2.0 updating the base image; also give this image the name ali/api:1.2.0; show the layer history.

Show example solution

docker build --pull -t api:1.2.0 .
docker tag api:1.2.0 ali/api:1.2.0
docker history api:1.2.0

Build the image with a tag.

docker build ____ api:1.2.0 .

Show answer

docker build -t api:1.2.0 .