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If you later make changes to the /etc/exports file, you can use the r option to reexport its entries. The r option will resync the /var/lib/nfs/xtab file with the /etc/exports entries, removing any other exports or any with different options.
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To both export added entries and re-export changed ones, you can combine both the r and a options.
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You can also use the exportfs command to manually export file systems instead of using an entry for it in the /etc/exports file. Export entries will be added to the /var/lib/nfs/xtab file directly. With the o option you can list various permissions, and then follow them with the host and file system to export. The host and file system are separated by a colon. For example, to manually export the /home/myprojects directory to golf.mytrek.com with the permissions ro and insecure, you would use the following:
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You can also use exportfs to unexport a directory that has already been exported, either manually or by the /etc/exports file. Just use the u option with the host and the directory exported. The entry for the export will be removed from the /var/lib/nfs/xtab file. The following example will unexport the /home/foodstuff directory that was exported to lizard.mytrek.com:
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The /etc/hosts.allow and /etc/hosts.deny are used to restrict access to services provided by your server to hosts on your network or on the Internet (if accessible). For example, you can use the hosts.allow file to permit access by certain hosts to your FTP server. Entries in the hosts.deny file would explicitly deny access to certain hosts. For NFS, you can provide the same kind of security by controlling access to specific NFS daemons. Note You can further secure your NFS transmissions by having them operate over TCP instead of UDP. Use the tcp option to mount your NFS file systems (UDP is the default); however, performance does degrade for NFS when it uses TCP. The first line of defense is to control access to the portmapper service. The portmapper tells hosts where the NFS services can be found on the system. Restricting access does not allow a remote host to even locate NFS. For a strong level of security, you should deny access to all hosts except those that are explicitly allowed. In the hosts.deny file, you would place the following entry, denying access to all hosts by default. ALL is a special keyword denoting all hosts.
portmap:ALL
In the hosts.allow file, you would then enter the hosts on your network, or any others that you would want to permit access to your NFS server. Again, you would specify the portmapper service. Then list the IP addresses of the hosts you are permitting access. You can list specific IP addresses or a network range using a netmask. The following example allows access only by hosts in the local network, 192.168.0.0, and to the host 10.0.0.43. You can separate addresses with commas.
portmap: 192.168.0.0/255.255.255.0, 10.0.0.43
The portmapper is also used by other services like NIS. Should you close all access to the portmapper in hosts.deny, you will also need to allow access to NIS services in hosts.allow, should you be running them. These include ypbind and ypserver. In addition, you may have to add entries for remote commands like ruptime and rusers, if you are supporting them. In addition, it is also advisable to add the same level of control for specific NFS services. In the hosts.deny file you would add entries for each service, as shown here:
mountd:ALL rquotad:ALL statd:ALL lockd:ALL
Then, in the hosts.allow file, you can add entries for each service:
mountd: 192.168.0.0/255.255.255.0, 10.0.0.43 rquotad: 192.168.0.0/255.255.255.0, 10.0.0.43 statd: 192.168.0.0/255.255.255.0, 10.0.0.43 lockd: 192.168.0.0/255.255.255.0, 10.0.0.43
You can further control access using Netfilter to check transmissions from certain hosts on the ports used by NFS services. See 40 for an explanation of Netfilter. The portmapper uses port 111 and nfsd uses 2049. Netfilter is helpful if you have a private network that has an Internet connection, and you want to protect it from the Internet. Usually a specific network device, like an Ethernet card, is dedicated to the Internet connection. The following examples assume that device eth1 is connected to the Internet. Any packets attempting access on ports 111 and 2049 are refused.
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