Docker笔记

示例

Dockerfile

FROM alpine:latest

ARG TAG=0.0.1
ARG PORT_ARG=3080

RUN apk add --no-cache bash

# 切换默认shell为bash
SHELL ["/bin/bash", "-c"]
RUN echo tag=$TAG
RUN echo port_tag=$PORT_ARG

构建

docker build --no-cache  --progress plain --rm --build-arg TAG=0.0.3 --build-arg PORT_ARG=3000 --tag hello/world:0.0.3 .

运行

docker run hello/world:0.0.3

笔记

• ARG 用来声明参数，语法为ARG <key>=<default-value>，需要在在FROM之后才会有作用
• build时, 通过--build-arg的方式传递，语法为--build-arg <key>=<value>, 可以多组

参考

• How To Pass Environment Info During Docker Builds
• Docker: How to use bash with an Alpine based docker image?