I have a signed trusted certificate. Can I use it with Rancher if I use the Docker install or do I have to use helm?

You could try with something like this:

docker run -d --restart=unless-stopped \
  -p 80:80 -p 443:443 \
  -v /<CERT_DIRECTORY>/<FULL_CHAIN.pem>:/etc/rancher/ssl/cert.pem \
  -v /<CERT_DIRECTORY>/<PRIVATE_KEY.pem>:/etc/rancher/ssl/key.pem \
  -v /<CERT_DIRECTORY>/<CA_CERTS.pem>:/etc/rancher/ssl/cacerts.pem \
  --privileged \
  rancher/rancher:latest

@billions-vase-14972 u run the commande but i have this error: key.pem does not contain a certificate or CRL: skipping and an don't have an https connection