All, I'm getting errors while installing CDSW in my cluster. Below is the output of cdsw validate command.   [centos@cdsw ~]$ sudo cdsw validate [Validating host configuration] > Prechecking OS Version........[OK] > Prechecking kernel Version........[OK] > Prechecking that SELinux is disabled........[OK] > Prechecking scaling limits for processes........[OK] > Prechecking scaling limits for open files........ WARNING: Cloudera Data Science Workbench recommends that all users have a max-open-files limit set to 1048576. It is currently set to [1024] as per 'ulimit -n' Press enter to continue > Loading kernel module [ip_tables]... > Loading kernel module [iptable_nat]... > Loading kernel module [iptable_filter]... > Prechecking that iptables are not configured........ WARNING: Cloudera Data Science Workbench requires iptables, but does not support preexisting iptables rules. Press enter to continue > Prechecking kernel parameters........[OK] > Prechecking to ensure kernel memory accounting disabled:........[OK] > Prechecking Java distribution and version........[OK] > Checking unlimited Java encryption policy for AES........[OK] > Prechecking size of root volume........[OK] [Validating networking setup] > Checking if kubelet iptables rules exist The following chains are missing from iptables: [KUBE-EXTERNAL-SERVICES, WEAVE-NPC-EGRESS, WEAVE-NPC, WEAVE-NPC-EGRESS-ACCEPT, KUBE-SERVICES, WEAVE-NPC-INGRESS, WEAVE-NPC-EGRESS-DEFAULT, WEAVE-NPC-DEFAULT, WEAVE-NPC-EGRESS-CUSTOM, KUBE-FIREWALL] WARNING:: Verification of iptables rules failed: 1 > Checking if DNS server is running on localhost > Checking the number of DNS servers in resolv.conf > Checking DNS entries for CDSW main domain WARNING:: DNS doesn't resolve cdsw.company.fr to cdsw.company.fr; DNS is not configured properly: 1 > Checking reverse DNS entries for CDSW main domain WARNING:: DNS doesn't resolve cdsw.company.fr to cdsw.company.fr; DNS is not configured properly: 1 > Checking DNS entries for CDSW wildcard domain WARNING:: DNS doesn't resolve *.cdsw.company.fr to cdsw.company.fr; DNS is not configured properly: 1 > Checking that firewalld is disabled [Validating Kubernetes versions] > Checking kubernetes client version > Checking kubernetes server version WARNING:: Kubernetes server is not running, version couldn't be checked.: 1 [Validating NFS and Application Block Device setup] > Checking if nfs or nfs-server is active and enabled > Checking if rpcbind.socket is active and enabled > Checking if rpcbind.service is active and enabled > Checking if the project folder is exported over nfs WARNING:: The projects folder /var/lib/cdsw/current/projects must be exported over nfs: 1 > Checking if application mountpoint exists > Checking if the application directory is on a separate block device WARNING:: The application directory is mounted on the root device.: 1 > Checking the root directory (/) free space > Checking the application directory (/var/lib/cdsw) free space [Validating Kubernetes cluster state] > Checking if we have exactly one master node WARNING:: There must be exactly one Kubernetes node labelled 'stateful=true': 1 > Checking if the Kubernetes nodes are ready > Checking kube-apiserver pod WARNING: Unable to reach k8s pod kube-apiserver. WARNING: [kube-apiserver] pod(s) are not ready under kube-system namespace. WARNING: Unable to bring up kube-apiserver in the kube-system cluster. Skipping other checks.. [Validating CDSW application] > Checking connectivity over ingress WARNING:: Could not curl the application over the ingress controller: 7 -------------------------------------------------------------------------- Errors detected. Please review the issues listed above. Further details can be collected by capturing logs from all nodes using "cdsw logs". ------------------------------------------------------------------------------------------------------------------------------     Error 1) "DNS is unable to resolve the hostname": i have the following details in the /etc/hosts file (sorry if i've missed something elementary here): [centos@cdsw ~]$ sudo cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 172.16.40.3 master.company.fr master 172.16.40.4 worker1.company.fr worker1 172.16.40.5 worker2.company.fr worker2 172.16.40.6 worker3.company.fr worker3 172.16.40.7 cdsw.company.fr cdws 172.16.40.7 *.cdsw.company.fr   Error 2) "Unable to reach k8s pod kube-apiserver" Does anyone know what is causing this issue?   Many thanks,    ... View more