I practice about kubernetes using minikube

I make docker-registry as a pods and I create docker-registry service

edit /etc/docker/daemon.json

{
"insecure-registries":["192.168.99.100:30050"]
}

edit openssl.conf

[v3_req]
subjectAltName = IP:192.168.99.100

And I make certificate

openssl genrsa -out my.crt
openssl req -x509 -new -nodes -key my.key -subj "CN=192.168.99.100:30050" -days 5000 -out my.crt

create registry-tls-secret

kubectl create secret generic registry-tls-secret --from-file=my.crt=my.crt --from-file=my.key=my.key

and make directory and copy my.crt file into the directory

/etc/docker/certs.d/192.168.99.100:30050

So I can push & pull 192.168.99.100:30050/[image]:[tag] on the host

And After I try to make hello-world pods

hello-world image is into the docker-registry(192.168.99.100:30050) already

I create secrets docker-registry regcred

kubectl create secret docker-registry regcred --docker-server=192.168.99.100:30050 --docker-usernmae=<user-name> --docker-password=<user-password> --docker-email=<user-email>

and write helloworld-deployment.yaml

...
    image: 192.168.99.100:30050/hello-world:v1
...
imagePullSecrets:
  -name: regcred
...

Finally I apply helloworld-deployment.yaml But I got an error message that

Failed to pull image "192.168.99.100:30050/hello-world:v1": rpc error: code = Unknown desc = Error response from daemon: Get https://192.168.99.100:30050/v2/: x509: certificate signed by unknown authority

I don't really what I'm missing... please help me...