Shulou(Shulou.com)06/02 Report--

NFS: Network File System

NFS: protocols, Unix-like systems, file systems (kernel)

SUN:

NFSv1

NFSv2

NFSv3

NFSv4

RPC: remote procedure call

2049/tcp

2049/udp

NIS: Network Information Service

NIS+

Kerberos

RPC: portmapper

Monitor

111/tcp

111/udp

Based on the processes provided by RPC, when starting, you need to register with rpc to listen on a certain port, and rpc will listen from each unused port.

Pick one to listen to this process, that is, a semi-random mechanism:

NFS:

Installation configuration:

Service installer: nfs-utils

Three key processes:

Mountd: mounts the daemon, which is responsible for client source authentication.

Nfsd: file read and write

Idmapd:id mapping process

/ etc/exports:

File system client 1 (File system Export Properties) client 2

Client:

IP: 192.168.1.29

Hostname

Network

File system export properties:

Rw

Async

Sync

Root_squash: compress root users, based on imap, and access root over the network

When converted to a nfsnobody user

No_root_squash: do not compress root users

All_squash: compress all users

Anonuid,anongid: specify anonymous users

Showmount

-e: execute on the nfs client to explore the nfs file system exported by a host, using the format

"showmount-e Server_IP"

-d: executed on the nfs server to show which exported file system has been mounted and used by at least one customer:

-a: display all mount sessions on the nfs server:

Exportfs:

-a: operate all file systems

-ra: re-export all file systems

-ua: cancels all imported file systems

-v: display details

Experiment:

Two test servers:

NFS server: 192.168.1.28

NFS client: 192.168.1.29

1. Create a shared directory / nfsshare on the NFS server

2. Edit the / etc/exports file on the NFS server, configure the shared directory, network segment and shared properties, etc.

3. Restart nfs

4. NFS client explores options for NFS server-side mount

5. The NFS client creates a mount directory / mnt/nfs, and mounts the

6. The NFS client enters the / mnt/nfs directory and creates a file called test.txt, which prompts you to have no permission, as shown below:

7. On the NFS server, add the no_root_squash parameter, do not compress root users, and restart nfs, as shown below:

8. On the NFS client, create a test directory and prompt it to be normal.

9. Create a user testuser of nfs on the NFS server, with a user id of 1000

10. The NFS client creates a new nfs user testuser with a user id of 1000. From the following figure, you can see the value of the user to the / nfsshare file

Normal operation, including creating files, copying files, etc.

11. On the NFS server, use the exportfs command to reload the nfs service

Modify the / etc/exportfs file and re-export using exportfs

12. Use showmount-e to view the exported / nfsshare on the NFS client

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