Newbie's simple Linuxnfs Process

A newbie is engaged in a simple NFS process-Linux Enterprise Application-Linux server application information. The following is a detailed description. There are many deficiencies in the initial linux writing process. Please forgive me!

The simplest one is:
1. Two computers with rh9 installed, 192.168.10.1 and 192.168.10.2, with 10.1 As the nfs server and 10.2 as the client. The two machines can ping each other.

2. Start the service on two computers respectively (of course, install the nfs Software Package)

# Service nfs start
And
# Service portmap start

3. Create a directory named 10.1 under/root on machine 999, create a 999.txt file under/root/999, and change the directory permissions of/999, I set # chmod 777 999

Run the # exportfs-rv command to view the directory that has been exports.

4. operations on the machine 10.2:
First # showmount-e 192.168.10.1 check whether the directory shared by the machine 10.1 can be found. Then, create a directory named 10.2 under the/root directory 888.

5. Mount the 10.2 directory on the machine 10.1:
# Mount-t nfs 192.168.10.1:/root/999/root/888

6. If you can mount the file correctly, you can see the 999.txt file under/root/10.2 of the machine 888.

Note: It is normal when I operate on a VM to step 3, but it will not work until step 3.