How to add insecure Docker registry certificate to kubeadm config - amazon-web-services

Question

I'm quite new to Kubernetes, and I managed to get an Angular app deployed locally using minikube. But now I'm working on a Bitnami Kubernetes Sandbox EC2 instance, and I've run into issues pulling from my docker registry on another EC2 instance.
Whenever I attempt to apply the deployment, the pods log the following error
Failed to pull image "registry-url.net:5000/app": no available registry endpoint:
failed to do request: Head https://registry-url.net/v2/app/manifests/latest:
x509: certificate signed by unknown authority
The docker registry certificate is signed by a CA (Comodo RSA), but I had to add the registry's .crt and .key files to /etc/docker/certs.d/registry-url.net:5000/ for my local copy of minikube and docker.
However, the Bitnami instance doesn't have an /etc/docker/ directory and there is no daemon.json file to add insecure registry exceptions, and I'm not sure where the cert files are meant to be located for kubeadm.
So is there a similar location to place .crt and .key files for kubeadm, or is there a command I can run to add my docker registry to a list of exceptions?
Or better yet, is there a way to get Kubernetes/docker to recognize the CA of the registry's SSL certs?
Thanks
Edit: I've included my deployment and secret files below:
app-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: app-deployment
spec:
replicas: 1
selector:
matchLabels:
app: app
template:
metadata:
labels:
app: app
spec:
containers:
- name: app
image: registry-url.net:5000/app
ports:
- containerPort: 80
env:
...
imagePullSecrets:
- name: registry-pull-secret
registry-secret.yaml
apiVersion: v1
kind: Secret
metadata:
name: registry-pull-secret
data:
.dockerconfigjson: <base-64 JSON>
type: kubernetes.io/dockerconfigjson

Answer 1

You need to create a secret with details for the repository.
This might be the example of uploading the image to your docker repo:
docker login _my-registry-url_:5000
Username (admin):
Password:
Login Succeeded
docker tag _user_/_my-cool-image_ _my-registry-url_:5000/_my-cool-image_:0.1
docker push _my-registry-url_:5000/_my-cool-image_:0.1
From that host you should create the base64 of ~/.docker/config.json like so
cat ~/.docker/config.json | base64
Then you will be able to add it to the secret, so create a yaml that might look like the following:
apiVersion: v1
kind: Secret
metadata:
name: registrypullsecret
data:
.dockerconfigjson: <base-64-encoded-json-here>
type: kubernetes.io/dockerconfigjson
Once done you can apply the secret using kubectl create -f my-secret.yaml && kubectl get secrets.
As for your pod it should look like this:
apiVersion: v1
kind: Pod
metadata:
name: jss
spec:
imagePullSecrets:
— name: registrypullsecret
containers:
— name: jss
image: my-registry-url:5000/my-cool-image:0.1

Answer 2

So I ended up solving my issue by manually installing docker via the following commands:
sudo add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"
sudo apt-get install docker-ce docker-ce-cli containerd.io
Then I had to create the directory structure /etc/docker/certs.d/registry-url:5000/ and copy the registry's .crt and .key files into the directory.
However, this still didn't work; but after stopping the EC2 instance and starting it again, it appears to pull from the remote registry with no issues.
When I initially ran service kubelet restart the changes didn't seem to take effect, but restarting did the trick. I'm not sure if there's a bettre way of fixing my issue, but this was the only solution that worked for me.