To resolve the issue of the shared users' home directory not being shown by the 'showmount -e localhost' command, you need to ensure that the NFS related services are properly configured and running. Here are the steps to troubleshoot and resolve the issue: 1. Verify that the directory is shared by checking the contents of '/etc/exports'. Use the command: 'cat /etc/exports'. Ensure that the home directory is listed in this file with appropriate access permissions. 2. Start the NFS service with the command: 'systemctl start nfs-server'. 3. Verify the status of the 'rpcbind' service, as 'portmap' has been replaced by 'rpcbind'. Use the command: 'systemctl start rpcbind'. 4. Ensure that these services start automatically on the next reboot with the commands: 'systemctl enable nfs-server' and 'systemctl enable rpcbind'. 5. Check the shared directories again with the 'showmount -e localhost' command to verify whether they are being shared. 6. Check the firewall settings. If the firewall is running, it might be blocking the necessary NFS ports. To flush iptables rules, use: 'iptables -F' and stop the iptables service using: 'systemctl stop iptables'. Alternatively, configure the firewall to allow NFS traffic by adding rules for 'nfs3', 'rpc-bind', and 'mountd' services, and then reload the firewall: 'firewall-cmd --add-service=nfs3 --permanent', 'firewall-cmd --add-service=rpc-bind --permanent', 'firewall-cmd --add-service=mountd --permanent', and 'firewall-cmd --reload'. Following these steps should help ensure that the shared home directories are correctly accessible and shown in the 'showmount -e localhost' command output.