Docker 在构建期间不会创建目录

Question

Experimenting with Docker for the first time. Have these steps in my Dockerfile to create a directory, but when I run the container, the directory isn't there.

FROM ubuntu
MAINTAINER AfterWorkGuinness
RUN apt-get update
RUN apt-get install -y openssh-server
RUN mkdir /root/.ssh
RUN cd /root/.ssh
RUN ssh-keygen -t rsa -N "" -f id_rsa
VOLUME /root
EXPOSE 22

Build image:

docker build -t ubuntu-ssh --no-cache .

Testing the directory when I run the container:

docker run -it -v c:/users/awg/dev/tmp/home:/root ubuntu-ssh

root@39eec8fa51ad:/# cd ~/.ssh
bash: cd: /root/.ssh: No such file or directory

root@39eec8fa51ad:/# cd /root/.ssh
bash: cd: /root/.ssh: No such file or directory

Answer 1

使用命名卷而不是绑定安装，

docker run -v tmphome:/root whatever

在命名卷中，文件在容器重新启动时仍将保留，但目录中的内容将在创建时复制到已安装的卷中。Docker 根据使用的驱动程序选择存储数据的位置。local是默认值，数据默认为volumeDocker 数据目录中的目录，通常/var/lib/docker/volumes