给出这个多阶段构建的小例子
FROM node:10 AS ui-build
WORKDIR /usr/src/app
FROM node:10 AS server-build
WORKDIR /root/
EXPOSE 3070
ENTRYPOINT ["node"]
CMD ["index.js"]
为什么这会在我的本地文件系统上产生 3 个图像?
"<none>";"<none>";"58d63982fbef";"2020-04-15 17:53:14";"912MB"
"node";"10";"bd83fcefc19d";"2020-04-14 01:32:21";"912MB"
"test";"latest";"3913dd4d03b6";"2020-04-15 17:53:15";"912MB"
我期望两个镜像,基础镜像和服务器构建镜像。我使用了标准的 docker build 命令,即
docker build -t test .
那么图像的哪些部分是空的,哪些是测试的?
我很困惑
Dockerfile 中的每个块都以FROM
线创建一个新图像。如果您使用docker build -t
选项,只有最后一个阶段才会用您指定的名称进行标记;剩余的块将显示为<none>
在像这样的地方docker images
output.
# node:10 is a base image
# Not the final image, will appear as <none>:<none>
FROM node:10 AS ui-build
...
# The final image, will appear as test:latest (`docker build -t` option)
FROM node:10 AS server-build
...
您偶尔会看到 Dockerfiles,其中基础镜像在后续构建阶段被重用,并且它根本不会出现在docker images
output.
# Will be hidden because it has descendant images
FROM node:10 AS base
RUN apt-get update && apt-get upgrade
# Will appear as <none>:<none>
FROM base AS ui
...
# Will get the `docker build -t` tag
FROM base
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