Creating the exports file with YaST in .NET

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Creating the exports file with YaST
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YaST s NFS server module (yast2 nfs_server) can write the /etc/exports file for you. As with the NFS client module, there is probably no great advantage for most people in being able to configure this with a graphical tool, as it simply asks for the information that will be
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21 Working with NFS
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written in the configuration file. Some people may prefer this method simply because it makes it slightly less likely that a single typo will mess up your configuration. Figure 21-2 shows an example of the NFS server module in action.
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Figure 21-2: Configuring the NFS server with YaST When you start the module, it first asks whether or not the NFS server should be started and then provides an interface that allows you to add a directory (to be exported) and specify the hosts and the options for that share. These are precisely the options discussed previously, and you have to type them in by hand.
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The exportfs command
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The exportfs command can be used to handle the exporting of directories directly from the command line. To export all directories listed in /etc/exports, use exportfs -a. If /etc/exports has changed, exportfs -r rereads /etc/exports and changes the state of the directories being exported accordingly. This is like doing rcnfsserver reload. You can export a directory that is not mentioned in /etc/exports by doing something like this:
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root@bible: ~ # exportfs -iv -o rw,sync client:/tmp
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The -iv option tells exportfs to ignore /etc/exports and be verbose. The -o introduces the options, and the command as a whole exports the directory /tmp to the machine client. With the option -u, the command unexports a currently exported directory:
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root@bible: ~ # exportfs u client:/tmp
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To unexport all directories mentioned in /etc/exports, do exportfs -au.
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Note The changes made by these commands are actually held in the file /var/lib/nfs/etab. This is contrary to the information in the current man page for exportfs.
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The showmount command
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The command showmount provides information about mounts on an NFS server.
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user@client: ~ > showmount e bible
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This command lists the exports list for the server bible. Typically this will be the contents of /etc/exports, but if changes have been made without using exportfs as described in the previous section, these will be reflected in the output.
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root@bible: ~ # exportfs -i -o rw,sync client:/home user@client: ~ > showmount e bible /test * /home client
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In the preceding example, you can see /home, which you just configured, and /test, which was included in /etc/exports. If you want information about what is actually being mounted from bible, use the -a option:
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user@client: ~ > showmount -a bible All mount points on bible: client:/test
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This shows that the directory /test on bible is currently mounted by client.
showmount -d bible shows just the directories being mounted: user@client: ~ > showmount -d bible Directories on boojum: /test Caution The information given by showmount can sometimes include stale information about old mounts that are no longer present. This can happen, for example, if a client reboots without unmounting the NFS mount. To correct this situation, you can, if necessary, remove the file /var/lib/nfs/rmtab on the server and restart the NFS server.
Problems with mounting NFS shares
If you find that you cannot mount a share that you think should work, the first thing to check is whether the NFS server is actually running. Check the /etc/exports file on the server
21 Working with NFS
carefully, and be sure that you have done exportfs -r or rcnfsserver reload since making any changes to it. The command rpcinfo can be useful; if all is well, its output should look something like this:
user@client: ~ > rpcinfo -p boojum program vers proto port 100000 2 tcp 111 portmapper 100000 2 udp 111 portmapper 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100003 4 udp 2049 nfs 100227 3 udp 2049 nfs_acl 100003 2 tcp 2049 nfs 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100227 3 tcp 2049 nfs_acl 100021 1 udp 32771 nlockmgr 100021 3 udp 32771 nlockmgr 100021 4 udp 32771 nlockmgr 100024 1 udp 32771 status 100021 1 tcp 32830 nlockmgr 100021 3 tcp 32830 nlockmgr 100021 4 tcp 32830 nlockmgr 100024 1 tcp 32830 status 100005 1 udp 629 mountd 100005 1 tcp 633 mountd 100005 2 udp 629 mountd 100005 2 tcp 633 mountd 100005 3 udp 629 mountd 100005 3 tcp 633 mountd
If you don t see entries for nfs and mountd in this listing, then something is seriously wrong; perhaps the NFS server has not registered itself with the portmapper. Try stopping the NFS server, the portmap service, and the network and then starting them in the reverse order.