Working with NFS in .NET

Development Code128 in .NET Working with NFS
21 Working with NFS
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You can use the YaST runlevel module (YaST System Runlevel Editor) for this, or alternatively:
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root@bible: root@bible: root@bible: root@bible: ~ ~ ~ ~ # # # # chkconfig chkconfig chkconfig chkconfig nfsserver on nfslock on nfsboot on portmap on
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The exports file
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The sharing of directories by NFS is controlled by the file /etc/exports, which contains a list of directories with details of the hosts they may be exported to and other options. A simple example such as /etc/exports might contain just the following line:
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/test client(rw)
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This will export the directory /test to the host client. The option rw (read-write) is set. If you restart the NFS server, you see this:
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Shutting down kernel based NFS server done Starting kernel based NFS server exportfs: /etc/exports [8]: No sync or async option specified for export *:/home . Assuming default behaviour ( sync ). NOTE: this default has changed from previous versions done
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To avoid this message, add sync or async to the options:
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/test client(rw,sync)
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The default option sync means that the NFS server waits for local disk writes to complete, thus minimizing the risk of data corruption if the server suddenly fails. If async is specified, the opposite is the case, meaning that if communication between client and server fails, corrupt data might be written to the client. Note that there should be no space between the client name(s) and the options. If there is, the NFS server interprets the line differently; in the preceding example, it would offer /test to machine client with the default options and to any other machine with the options rw,sync. This is unfortunate because it is an easy mistake to make in creating the file. However, to indicate that you want to export to any machine, you should preferably use the * notation. If you want to export /test to any machine, use the following:
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/test *(rw,sync)
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Having made a change in /etc/exports, use the command nfsserver reload to make the NFS server re-read the configuration without restarting it. You can specify an IP number or range, or a Domain Name System (DNS) name (provided it can be resolved) as the client or clients to export to. So any of the following work:
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/test /test /test /test client(rw,sync) 192.168.1.26(rw,sync) 192.168.1.0/255.255.255.0(rw,sync) 192.168.1.0/24(rw,sync)
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The option rw (read-write) is set in all the preceding lines. However, the option ro allows read-only access only if you want. As we noted previously, the /etc/exports file is simply a collection of lines like those we ve shown. The comment character is #. So the following might be a simple complete /etc/exports:
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# # # # # See the exports(5) manpage for a description of the syntax of this file. This file contains a list of all directories that are to be exported to other computers via NFS (Network File System). This file used by rpc.nfsd and rpc.mountd. See their manpages for details on how make changes in this file effective.
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/data2/ *(sync) /home/peter/ rabbit(rw,root_squash,sync) /home/david/ *(rw,root_squash,sync) /media/cdrom/ *(sync)
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In this example, the comments at the top are all that you will see in /etc/exports on a new installation. The directory /data2 is exported read-only (that s the default if neither ro or rw is specified) to any host. Peter s home directory is exported read-write with the root_squash option, but only to his machine named rabbit. If he becomes root on rabbit, he still won t have root privileges over the files in the share. The CD drive is exported to all hosts.
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Setting root, user, and group client privileges
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By default, the root user on the client is mapped to the anonymous user nobody on the server, which means that the root user on the client does not have full root privileges over the files on the mounted share. This default option can be made explicit by specifying root_squash. The opposite of this is no_root_squash, which allows the root user on the client full root privileges on the NFS share.
Note Unless there is a special reason to do otherwise, filesystems should be exported with the root_squash option.
The option all_squash is similar but maps all users to the user nobody. When the share is mounted, a normal user on the client will not be able to write to the share unless the permissions on the directory allow others to write. And any file that is created in this way will be owned by user nobody and group nogroup. When using the all_squash option, you can also specify explicitly the user ID (UID) and group ID (GID) that you want users to be mapped to rather than the defaults for the user nobody. For example:
/test client(rw,sync,all_squash,anonuid=1999,anongid=1999)
This allows you to create a user on the server with the stated UID and GID and suitably arrange that user s permissions on the share.