docker - 将 args 从 docker-compose 传递到 Dockerfile

Question

我的产品环境有以下配置:

docker-compose-prod.yml

version: '3.3'
services:
  nginx:
    build:
      context: nginx
      dockerfile: Dockerfile
      args:
        LANDING_PAGE_DOMAIN: ${LANDING_PAGE_DOMAIN}
    container_name: nginx   
    networks:
      - app-network

Dockerfile

FROM nginx:alpine

COPY nginx.conf /etc/nginx/nginx.conf
COPY production/* /etc/nginx/conf.d/

ARG LANDING_PAGE_DOMAIN
RUN sed -i s/{LANDING_PAGE_DOMAIN}/${LANDING_PAGE_DOMAIN}/g /etc/nginx/conf.d/landing.conf

EXPOSE 80 443

因此，当我尝试构建它时，我收到了下一个警告:

docker-compose -f docker-compose.production.yml build --build-arg LANDING_PAGE_DOMAIN="test.com" nginx

WARNING: The LANDING_PAGE_DOMAIN variable is not set. Defaulting to a blank string.

我哪里出错了？

Answer 1

关键字ARG在FROM指令之前和之后具有不同的作用域

尝试在 Dockerfile 中使用 ARG 两次，和/或者您可以尝试 ENV 变量

ARG LANDING_PAGE_DOMAIN
FROM nginx:alpine

COPY nginx.conf /etc/nginx/nginx.conf
COPY production/* /etc/nginx/conf.d/

ARG LANDING_PAGE_DOMAIN
ENV LANDING_PAGE_DOMAIN=${LANDING_PAGE_DOMAIN}

RUN sed -i s/{LANDING_PAGE_DOMAIN}/${LANDING_PAGE_DOMAIN}/g /etc/nginx/conf.d/landing.conf

EXPOSE 80 443