I'm trying to deploy Gitlab-runner(s) on Openshift/K8S, but can't succeed in having runners communicating with Gitlab (itself deployed in pods on OCP).

I followed couple of different instructions like these ones:

• https://www.youtube.com/watch?v=EwbhA53Jpp4
• https://docs.gitlab.com/runner/install/kubernetes.html
• https://github.com/oprudkyi/openshift-templates/blob/master/gitlab-runner/gitlab-runner.yaml

My gitlab-runner pod is starting properly, but it always receives HTTP 404 Not Found error messages.

Here is my toml config file:

# cat /etc/gitlab-runner/config.toml
concurrent = 6
check_interval = 0

[[runners]]
  name = "GitLab Runner"
  url = "http://gitlab-ce.MY_COMAIN.com/ci"
  token = "WHO_CARES?"
  executor = "kubernetes"
  [runners.kubernetes]
    namespace = "MINE"
    privileged = false
    host = ""
    cert_file = ""
    key_file = ""
    ca_file = ""
    image = ""
    cpus = ""
    memory = ""
    service_cpus = ""
    service_memory = ""
    helper_cpus = ""
    helper_memory = ""
    helper_image = ""
  [runners.cache]
    Type = "s3"
    ServerAddress = "minio-service:80"
    AccessKey = "GENERATED"
    SecretKey = "GENERATED"
    BucketName = "bkt-gitlab-runner"
    Insecure = true

And as soon as the pod starts, I have this in my logs:

Starting multi-runner from /etc/gitlab-runner/config.toml ...  builds=0
Running in system-mode.                            

Configuration loaded                                builds=0
Metrics server disabled                            
WARNING: Checking for jobs... failed                runner=WHO_CARES? status=404 Not Found
WARNING: Checking for jobs... failed                runner=WHO_CARES? status=404 Not Found
WARNING: Checking for jobs... failed                runner=WHO_CARES? status=404 Not Found

And in Gitlab, in the runners page (https://gitlab-ce.MY_COMAIN.com/group/project/settings/ci_cd) there is no "Runners activated for this project".

I can log in to my pod in its terminal and launch gitlab-runner register to register a new runner

/ # gitlab-runner register
Running in system-mode.

Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com/):
https://gitlab-ce.MY_COMAIN.com
Please enter the gitlab-ci token for this runner:
WHO_CARES?
Please enter the gitlab-ci description for this runner:
[dc-gitlab-runner-service-1-ktw6v]: test
Please enter the gitlab-ci tags for this runner (comma separated):
test
Registering runner... succeeded                     runner=WHO_CARES?
Please enter the executor: docker+machine, kubernetes, ssh, docker-ssh, parallels, shell, virtualbox, docker-ssh+machine, docker:
kubernetes
Runner registered successfully. Feel free to start it, but if it's running already the config should be automatically reloaded!

But when I try to run it... I'm facing the exact same issue.

/ # gitlab-runner run
Starting multi-runner from /etc/gitlab-runner/config.toml ...  builds=0
Running in system-mode.

Configuration loaded                                builds=0
Metrics server disabled
WARNING: Checking for jobs... failed                runner=WHO_CARES? status=404 Not Found
WARNING: Checking for jobs... failed                runner=WHO_CARES? status=404 Not Found

Of course, I checked if I can access Gitlab from the Runner terminal, and it works

/ # ping
BusyBox v1.27.2 (2018-06-06 09:08:44 UTC) multi-call binary.

Usage: ping [OPTIONS] HOST

/ # ping gitlab-ce.MY_COMAIN.com
PING gitlab-ce.MY_COMAIN.com (1.2.3.4): 56 data bytes
64 bytes from 1.2.3.4: seq=0 ttl=63 time=0.268 ms
64 bytes from 1.2.3.4: seq=1 ttl=63 time=0.261 ms
64 bytes from 1.2.3.4: seq=2 ttl=63 time=0.288 ms
^C

Side note: I'm running OCP 3.9 / K8S 1.9

Do you see anything I'm doing wrong?

Cheers, Olivier