I had the same problem, which caused the entire cluster creation to fail since it blocks the installing the network plugin and occm.
The problem is probably inside the generate_certificates function in make-cert-client.sh / make-cert.sh The function gets executed 5 times for server, kubelet, admin and proxy and every time the ca certificate is appended to ca.crt curl $VERIFY_CA -X GET \ -H "X-Auth-Token: $USER_TOKEN" \ -H "OpenStack-API-Version: container-infra latest" \ $MAGNUM_URL/certificates/$CLUSTER_UUID | python -c 'import sys, json; print(json.load(sys.stdin)["pem"])' >> $CA_CERT As a workaround, I just deleted the duplicate certificates inside ca.crt and restarted the kube-controller-manager. After that, the cluster created successfully -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926817 Title: kube-controller-manager crashes due to 5 duplicate certs in ca.crt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/magnum/+bug/1926817/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs