Cannot connect to the daemon docker in a docker image of docker - docker

Question

I am trying to build CI with gitlab, I go from a docker image of docker, and i didn't have any problem with my front repository, but now with the back withe the same gitlab-ci configuration file, i have this daemon error.
Here is the output of the build :
[0KRunning with gitlab-ci-multi-runner 1.10.4 (b32125f)[0;m
[0;m[0KUsing Docker executor with image docker:1.13.1 ...
[0;m[0KPulling docker image docker:1.13.1 ...
[0;mRunning on runner-4e4528ca-project-1649638-concurrent-0 via runner-4e4528ca-machine-1487688057-7c0f1e46-digital-ocean-4gb...
[32;1mCloning repository...[0;m
Cloning into '/builds/***/formation-back'...
[32;1mChecking out af7cbcae as docker...[0;m
[32;1mSkipping Git submodules setup[0;m
[32;1m$ docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com[0;m
Warning: failed to get default registry endpoint from daemon (Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?). Using system default: https://index.docker.io/v1/
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[31;1mERROR: Build failed: exit code 1
[0;m
Here is my .gitlab-ci.yml :
image: docker:1.13.1
stages:
- build
- test
- deploy
variables:
BUILD_IMG: $CI_REGISTRY_IMAGE:$CI_BUILD_REF
TEST_IMG: $CI_REGISTRY_IMAGE:$CI_BUILD_REF_NAME
RELEASE_IMG: $CI_REGISTRY_IMAGE:latest
AWS_STAGING_ENV: "***"
AWS_PROD_ENV: "***"
DOCKERRUN: Dockerrun.aws.json
DEPLOY_ARCHIVE: ${AWS_APP}-${CI_BUILD_REF}.zip
before_script:
- docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
- .ci/before_script
build:
stage: build
script:
- docker build --pull -t $BUILD_IMG .
- docker push $BUILD_IMG
test:
stage: test
script:
- docker pull $BUILD_IMG
- docker run --rm $BUILD_IMG npm run test
- docker tag $BUILD_IMG $TEST_IMG
- docker push $TEST_IMG
deploy:staging:
stage: deploy
environment: Staging
variables:
DOCKER_IMG: ${CI_REGISTRY_IMAGE}:${CI_BUILD_REF}
script:
- ./.ci/create-deploy-archive $DOCKER_IMG $AWS_BUCKET $DOCKERRUN $DEPLOY_ARCHIVE
- ./.ci/aws-deploy $DEPLOY_ARCHIVE $CI_BUILD_REF $AWS_STAGING_ENV
artifacts:
paths:
- $DEPLOY_ARCHIVE
except:
- production
deploy:production:
stage: deploy
environment: Production
variables:
DOCKER_IMG: ${CI_REGISTRY_IMAGE}:latest
script:
- .ci/push-new-image $TEST_IMG $RELEASE_IMG
- .ci/create-deploy-archive $DOCKER_IMG $AWS_BUCKET $DOCKERRUN $DEPLOY_ARCHIVE
- .ci/aws-deploy $DEPLOY_ARCHIVE $CI_BUILD_REF $AWS_PROD_ENV
artifacts:
paths:
- $DEPLOY_ARCHIVE
only:
- production
when: manual
Here is my config.toml file :
concurrent = 1
check_interval = 0
[[runners]]
name = "***"
url = "https://gitlab.com/ci"
token = "750c63cba1c269d789bdb33c42b726"
executor = "docker"
[runners.docker]
tls_verify = false
image = "alpine:3.5"
privileged = true
disable_cache = false
volumes = ["/cache", "/var/run/docker.sock:/var/run/docker.sock"]
[runners.cache]
Here is docker info :
DEBU[0771] Calling GET /v1.24/info
Containers: 1
Running: 1
Paused: 0
Stopped: 0
Images: 1
Server Version: 1.12.6
Storage Driver: devicemapper
Pool Name: docker-202:1-395267-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 519 MB
Data Space Total: 107.4 GB
Data Space Available: 6.569 GB
Metadata Space Used: 1.397 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.146 GB
Thin Pool Minimum Free Space: 10.74 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Deferred Deletion Enabled: false
Deferred Deleted Device Count: 0
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.93-RHEL7 (2015-01-28)
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge overlay null host
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options:
Kernel Version: 4.4.44-39.55.amzn1.x86_64
Operating System: Amazon Linux AMI 2016.09
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 995.2 MiB
Name: ip-172-31-30-143
ID: D6DU:OBWL:R3HK:DSZK:EOYC:5EHS:NU4I:4M3T:H5PL:JWLH:CIPD:I7VW
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
File Descriptors: 20
Goroutines: 27
System Time: 2017-02-22T11:16:19.042666914Z
EventsListeners: 0
Registry: https://index.docker.io/v1/
Insecure Registries:
127.0.0.0/8

Answer 1

You need to add
services:
- docker:dind
to your .gitlab-ci.yml. This tells the runner to start a second container (docker:dind), which is an image of a working docker daemon. It needs to be in a second image in order to run.
For more Information, see the docker example project: https://gitlab.com/gitlab-examples/docker/blob/master/.gitlab-ci.yml
It doesn't work without the service because there is no running docker daemon and you can't run your build inside the docker:dind container because the run command would replace the docker daemon.

Answer 2

What worked for me was to disable TLS by adding this in your runners section
environment, as per https://about.gitlab.com/releases/2019/07/31/docker-in-docker-with-docker-19-dot-03/
variables:
DOCKER_DRIVER: overlay2
DOCKER_TLS_CERTDIR: ""

Answer 3

The image docker:dind failed, but docker:18.09.7-dind worked for me.
services:
- name: docker:18.09.7-dind
Here is Gitlab issue details: https://gitlab.com/gitlab-org/gitlab-runner/-/issues/2623#note_206835782