How to use docker inside Alpine/Any docker image in gitlab ci-CodePudding

I want to build and test my app using dockerfile located in other private repository. For that I'm using Alpine official docker image in which i run a bash script for cloning my private repo and running docker for building the docker image. This is how my .gitlab-ci.yml looks like.

    image: alpine:3.15
stages:
  - main

main-job:
  stage: main
  script:
    - apk add --update docker openrc
    - rc-update add docker boot
    - apk add bash git curl
    - bash build.sh $GH_TOKEN $REPO

And I have simple script in build.sh

git clone https://${GH_TOKEN}@github.com/${REPO} source
cd source || exit 1
docker container prune --force || true
docker build . --rm --force-rm --compress --no-cache=true --pull --file Dockerfile -t test-app
docker image ls
docker run --privileged --rm -i test-app

But Docker don't start and spams error.

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

Also tried with other command in ubuntu docker like service start docker , dockerd, service restart docker and others. But nothing seems to works as i guess we can't run docker inside a docker or something.

Can we have any alternative idea to it?

CodePudding user response：

I‘d suggest you build and push your built image to dockerhub. Then you can start the container referencing your prebuilt image.

CodePudding user response：

Looks like you don’t have a docker agent running. You can use the docker in docker service by adding the following:

services:
  - docker:dind

See the GitLab-ci docs on building docker images for more info: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html

CodePudding user response：

I've meet the same issue. May be you have to permit gitlab-runner on your host.

sudo usermod -aG docker gitlab-runner