Docker 内部 ubuntu 18.04 docker 图像未运行

Question

I have installed a ubuntu 18.04 container inside which I tried to start the docker service. I got the error,

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Is it possible to run docker inside a docker image? How do I give the privilege to run the nested image?

Answer 1

This comes up quite often when trying to build bitbucket or Jenkins CI pipelines, bitbucket for example allows to specifiy docker as a service.A good answer to your questions is available here: https://devopscube.com/run-docker-in-docker/

As given in first option in the article,it is possible to map host docker service inside of docker instance as below:

docker run -v /var/run/docker.sock:/var/run/docker.sock -ti docker-image

Answer 2

If you want to run docker inside docker then you have to use dind images

docker run --privileged --name some-docker -v /my/own/var-lib-docker:/var/lib/docker -d docker:dind

Another way, If you want to run docker inside ubuntu container then you have to mount docker.sock of your host machine into your ubuntu container using docker volume

docker run -it -v /var/run/docker.sock:/var/run/docker.sock ubuntu:18.04