Docker：如何通過Dockerfile添加backports到sources.list？

Question

我需要通過Dockerfile在debian jessie上安裝ffmeg。

Debian建議使用backports。但我如何在Dockerfile中執行此操作？

添加

deb http://httpredir.debian.org/debian jessie-backports main non-free 
deb-src http://httpredir.debian.org/debian jessie-backports main non-free 

到

/etc/apt/sources.list 

這是我Dockerfile看起來像：

FROM node:4.8-slim 

COPY ./

## How to add backports to list ??? 

RUN apt-get update && apt-get install ffmpeg && ffmpeg -i 

RUN (cd programs/server && npm install --silent) 
CMD ["node", "main.js"] 

Answer 1

您可以通過添加以下

RUN printf "deb http://httpredir.debian.org/debian jessie-backports main non-free\ndeb-src http://httpredir.debian.org/debian jessie-backports main non-free" > /etc/apt/sources.list.d/backports.list 

做