How to configure Network file system (NFS) server?

67.How to configure Network file system (NFS) server?
Ans.
1. Verify the service package using following command
#rpmquery –qa | grep nfs

2. The export a file system we need to modify ‘/etc/exports’ file.
For example we want to export /media then we’ll add the following entries in ‘/etc/exports’ file.
/media 192.168.166.0/24(rw)

3. Now, with the export configured, start the daemons using the initializing scripts:
#server nfs start
#server nfs lock start

4. Now, use rpcinfo –p to make sure the necessary daemons are running as follow:
#rpcinfo –p

5. Next, execute showmount –a to list the servers NFS exports as follow:
#showmount –a

6. Finally, enable NFS from boot with the help of chkconfig.
#chkconfig nfs on

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What are the server and client security considerations?

72.What are the server and client security considerations? Ans. Server security considerations: 1. Always use the root_squash option in /etc/exports. 2. Enabled by default so do not disable it. 3. With root squashing clients root account can’t even access or change files that only server’s root account can change or access. Client security considerations: 1. Disable SUID (set UID) programs on NFS mounts using nosuid option. 2. Prevents server’s root account from creating an SUID root program on an exported FS, logging in to the clients as a normal user, and then using the UID root program to become root on the client.

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