Thank you Frank for your quick reply.

You are right. I was expecting dbus to modify the config file and bring up the export which was wrong assumptions from my end. When I added an EXPORT block in export.conf and used the dbus-send command later, I could add the export without any issue.

[root@localhost ~]# cat /etc/ganesha/export.conf
## Configure an export for some file tree
...

EXPORT {
        ## Export Id (mandatory, each EXPORT must have a unique Export_Id)
        Export_Id = 3;

        ## Exported path (mandatory)
        Path = /home/ganesha_1/;

        ## Pseudo Path (required for NFSv4 or if mount_path_pseudo = true)
        Pseudo = /home/ganesha_1/;

        Transports = "TCP";

        ## Exporting FSAL
        FSAL {
                Name = VFS;
        }
}
[root@localhost ~]#  sudo dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.AddExport string:/etc/ganesha/export.conf 'string:EXPORT(Export_Id=3)'
method return time=1591935638.984428 sender=:1.175 -> destination=:1.208 serial=36413 reply_serial=2
   string "1 exports added"
[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/home/ganesha_nfs_v3 (everyone)
/home/ganesha_nfs_v4 (everyone)
/home/ganesha_1      (everyone)
[root@localhost ~]#



As you have suggested, I have tried SIGHUP as well and it is also working fine for me.

[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/home/ganesha_nfs_v3 (everyone)
/home/ganesha_nfs_v4 (everyone)
/home/ganesha_1      (everyone)

[root@localhost ~]# mkdir /home/ganesha_2

[root@localhost ~]# ps -ef | grep nfs | grep -v grep
root     26823     1  0 Jun11 ?        00:00:49 /root/build_dir_v3_stable/ganesha.nfsd -f /etc/ganesha/ganesha.conf

== Modify export.conf to add new export
[root@localhost ~]# cat /etc/ganesha/export.conf
## Configure an export for some file tree
...

EXPORT {
        ## Export Id (mandatory, each EXPORT must have a unique Export_Id)
        Export_Id = 4;

        ## Exported path (mandatory)
        Path = /home/ganesha_2/;

        ## Pseudo Path (required for NFSv4 or if mount_path_pseudo = true)
        Pseudo = /home/ganesha_2/;

        Transports = "TCP";

        ## Exporting FSAL
        FSAL {
                Name = VFS;
        }
}

[root@localhost ~]# kill -SIGHUP 26823

[root@localhost ~]# ps -ef | grep nfs | grep -v grep
root     26823     1  0 Jun11 ?        00:00:49 /root/build_dir_v3_stable/ganesha.nfsd -f /etc/ganesha/ganesha.conf

[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/home/ganesha_nfs_v3 (everyone)
/home/ganesha_nfs_v4 (everyone)
/home/ganesha_1      (everyone)
/home/ganesha_2      (everyone)
[root@localhost ~]#

Once again, thanks a lot for your help.!!
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