Docker 错误：无法定位包 git
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Docker error: Unable to locate package git
提问by Nyxynyx
I'm using an image nginxwhich is based on dockerfile/ubuntu. On attaching to the docker container's shell
我正在使用nginx基于dockerfile/ubuntu. 附加到 docker 容器的外壳上
docker exec -it <container_id> /bin/bash
I want to do a git pullso I tried installing gitbut aptis unable to find the package:
我想做一个git pull所以我尝试安装git但apt无法找到包：
root@a71e45d5cd40:/# apt-get install git
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package git
How can we install gitfrom that image and why is it missing?
我们如何git从该映像安装，为什么缺少它？
cat /etc/apt/sources.list
cat /etc/apt/sources.list
deb http://httpredir.debian.org/debian wheezy main
deb http://httpredir.debian.org/debian wheezy-updates main
deb http://security.debian.org wheezy/updates main
deb http://nginx.org/packages/mainline/debian/ wheezy nginx
cat /etc/apt/sources.list.d/*
cat /etc/apt/sources.list.d/*
cat: /etc/apt/sources.list.d/*: No such file or directory
apt-cache madison git
apt-cache 麦迪逊 git
N: Unable to locate package git
回答by Michael
This is happening because the apt repository is not yet updated, it is common practice to clean your apt repositories and tmp files after creating an image, which your base image is probably doing.
发生这种情况是因为 apt 存储库尚未更新，通常的做法是在创建映像后清理 apt 存储库和 tmp 文件，您的基本映像可能正在这样做。
To fix this, you are going to want to run apt-get updateprior to installing git, it is good practice to combine the update and install command at the same time to bust cache on the update if the install line changes:
要解决此问题，您需要apt-get update在安装 git 之前运行，如果安装行更改，最好同时组合更新和安装命令以破坏更新缓存：
RUN apt-get update && apt-get install -y git
Using -yis convenient to automatically answer yes to all the questions.
使用-y非常方便，自动回答是肯定的所有问题。
