How do I install docker in a docker container?
This is my Dockerfile:
FROM golang
# RUN cat /etc/*release
RUN apt-get update
RUN apt-get -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common
RUN curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
RUN apt-get update
RUN apt-get -y install docker-ce
RUN docker run hello-world
Dockerfile golang is official, it is based on
Debian GNU/Linux 8 (jessie)
So, I wrote this Dockerfile by checking the installation steps from Docker Install Tutor (Debian)
But the way out
Step 8/8 : RUN docker run hello-world
---> Running in b183b8cc5d10
docker: Cannot connect to the Docker daemon at
unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.
How to solve this problem? I want to install Docker containers in a host Docker container.
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The easiest way is to use the official Docker-in-Docker images from https://hub.docker.com/_/docker/ with the tag :dind
(which is the successor to the already mentioned Hendrikwha project ).
You definitely need to use a flag as well --priviledged
:
docker run --privileged --name yourDockerContainerNameHere -d docker:dind
With this, your Docker-in-Docker experiments should work - but be aware of the many obstacles you may have: https://jpetazzo.github.io/2015/09/03/do-not-use-docker- in- docker-for-ci /
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I had a similar problem when trying to install Docker inside a Bamboo Server image. To solve this:
- first remove the line: RUN docker run hello-world from your
Dockerfile
- The easiest way - just open a socket Docker,
-v
its a-v
flag-v
or a mounted volume by usingDocker Compose
:
docker run -v/var/run/docker.sock: /var/run/docker.sock...
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