How to enable containerMode: "dind"

[elena123]

Hi all,

I'm new to ARC and kubernetes. We setup ARC, but docker is not working properly when we use the runners. We are receiving error:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? Error: Process completed with exit code 1.

I found in the documentation that we should enable the ContainerMode: "dind". Which are the steps to enable it?
here is the template that we have:
`## template is the PodSpec for each runner Pod

For reference: https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#PodSpec

template:
spec:
initContainers:
- name: init-dind-externals
image: ghcr.io/actions/actions-runner:latest
command: ["cp", "-r", "-v", "/home/runner/externals/.", "/home/runner/tmpDir/"]
volumeMounts:
- name: dind-externals
mountPath: /home/runner/tmpDir
- name: init-dind-rootless
image: docker:dind-rootless
command:
- sh
- -c
- |
set -x
cp -a /etc/. /dind-etc/
echo 'runner:x:1001:1001:runner:/home/runner:/bin/ash' >> /dind-etc/passwd
echo 'runner:x:1001:' >> /dind-etc/group
echo 'runner:100000:65536' >> /dind-etc/subgid
echo 'runner:100000:65536' >> /dind-etc/subuid
chmod 755 /dind-etc;
chmod u=rwx,g=rx+s,o=rx /dind-home
chown 1001:1001 /dind-home
securityContext:
runAsUser: 0
volumeMounts:
- mountPath: /dind-etc
name: dind-etc
- mountPath: /dind-home
name: dind-home
containers:
- name: runner
image: ghcr.io/actions/actions-runner:latest
command: ["/home/runner/run.sh"]
env:
- name: DOCKER_HOST
value: unix:///home/runner/var/run/docker.sock
securityContext:
privileged: true
runAsUser: 1001
runAsGroup: 1001
volumeMounts:
- name: work
mountPath: /home/runner/_work
- name: dind-sock
mountPath: /home/runner/var/run
- name: dind
image: docker:dind-rootless
args: ["dockerd", "--host=unix:///home/runner/var/run/docker.sock"]
securityContext:
privileged: true
runAsUser: 1001
runAsGroup: 1001
volumeMounts:
- name: work
mountPath: /home/runner/_work
- name: dind-sock
mountPath: /home/runner/var/run
- name: dind-externals
mountPath: /home/runner/externals
- name: dind-etc
mountPath: /etc
- name: dind-home
mountPath: /home/runner
volumes:
- name: work
emptyDir: {}
- name: dind-externals
emptyDir: {}
- name: dind-sock
emptyDir: {}
- name: dind-etc
emptyDir: {}
- name: dind-home
emptyDir: {}`

What might be the problem?

Thank you!
Elena