[Solved] x509: certificate signed by unknown authority

This error can occur if docker is not able to verify your certificate provider which might be due to the issue of bundle certificates used to verify the Certificate authority in absence of which you might be getting this error.

There is a workaround for this in which case it will ignore the certificate validation.

Create a file as /etc/docker/daemon.json
touch /etc/docker/daemon.json

Enter the following content in the daemon.json file replacing the endpoint for your repository as
[root@ip-10-240-43-119 certs]# cat /etc/docker/daemon.json
{
    "insecure-registries" : [ "registry.unixcloudfusion.in" ]
}

Go ahead and restart your docker service as
systemctl restart docker

Than try to push again to the repository this time you shouldn't get an error message.