Change the host name of the installed cluster node

Follow the steps below to change the host name of the installed cluster node.

1. Generate a new certificate for the new host name.

   • You can use a certificate signed by your enterprise RootCA.

   • Alternatively, you can generate a self-signed certificate by following the steps below:

     Log on to one of the master nodes and run the following commands:

     cd $K8S_HOME/ssl

     openssl genrsa -out ${hostName}.key 4096

     openssl req -new -key ${hostName}.key -subj "/CN=${hostName}" -out ${hostName}.csr

     openssl x509 -sha256 -req -in ${hostName}.csr -CA "${cacert}" -CAkey "${cakey}" -CAcreateserial -out ${hostName}.crt -days 365

     chmod 0400 ${hostName}.crt ${hostName}.key

     rm -f ${hostName}.csr

2. Follow the commands below to replace the defect nginx secret.

   kubectl delete secret nginx-default-secret -n core

   echo "

   apiVersion: v1

   kind: Secret

   metadata:

   name: nginx-default-secret

   namespace: core

   data:

   tls.crt: `base64 -w 0 $K8S_HOME/ssl/${hostName}.crt`

   tls.key: `base64 -w 0 $K8S_HOME/ssl/${hostName}.key`

   "| kubectl create -f -

3. Follow the commands below to restart the ingress container.

   kubectl delete -f $K8S_HOME/objectdefs/nginx-ingress.yaml

   kubectl create -f $K8S_HOME/objectdefs/nginx-ingress.yaml

4. On all master nodes, replace the hostname in the suite.yaml, mng-portal.yaml, and idm.yaml under the $K8S_HOME/objectdefs directory with the following commands.

   sed -i -e "s/old_hostname/new_hostname/g" $K8S_HOME/objectdefs/idm.yaml

   sed -i -e "s/old_hostname/new_hostname/g" $K8S_HOME/objectdefs/suite.yaml

   sed -i -e "s/old_hostname/new_hostname/g" $K8S_HOME/objectdefs/mng-portal.yaml

5. On one of the master nodes, restart the idm, suite, and mng-portal with the following commands.

   kubectl delete -f $K8S_HOME/objectdefs/idm.yaml

   kubectl delete -f $K8S_HOME/objectdefs/suite.yaml

   kubectl delete -f $K8S_HOME/objectdefs/mng-portal.yaml

   kubectl create -f $K8S_HOME/objectdefs/idm.yaml

   kubectl create -f $K8S_HOME/objectdefs/suite.yaml

   kubectl create -f $K8S_HOME/objectdefs/mng-portal.yaml