ci/cd "docker" command not found in image built with docker installed - docker

Question

I have this .gitlab-ci.yml file wanting to automate the docker image building, basically I'm using the one from the template:
docker-build:
image: my_image_build_with_docker_inside_inprivate_repo
stage: build
services:
- docker:dind
before_script:
- docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
# Default branch leaves tag empty (= latest tag)
# All other branches are tagged with the escaped branch name (commit ref slug)
script:
- |
if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
tag=""
echo "Running on default branch '$CI_DEFAULT_BRANCH': tag = 'latest'"
else
tag=":$CI_COMMIT_REF_SLUG"
echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
fi
- docker build --pull -t "$CI_REGISTRY_IMAGE${tag}" .
- docker push "$CI_REGISTRY_IMAGE${tag}"
# Run this job in a branch where a Dockerfile exists
rules:
- if: $CI_COMMIT_BRANCH
exists:
- Dockerfile
#$CI_REGISTRY_IMAGE = my_image_build_with_docker_inside_inprivate_repo
When I run it get this error:
$ docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGIST
/bin/bash: line 132: docker: command not found
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1
With : RUN apt-get install -y docker-compose , I get everything needed for docker to run in the debian image. But I still get the error of docker command not found as above. What are the other steps needed to run docker daemon from your custom image?
Update: From the private repository, pushing images with docker installed is not allowed either. Looks like I have to use something called kaniko. Any good resource for this?

Answer 1

You can try installing docker in the Dockerfile to build your custom image.
You can follow the steps defined in the official docs https://docs.docker.com/engine/install/debian/ which would look like something like this in your Dockerfile
RUN apt-get install -y \
ca-certificates \
curl \
gnupg \
lsb-release
RUN curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
RUN echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
RUN apt-get update -y
RUN apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin