This is documentation for MapR Version 5.0. You can also refer to MapR documentation for the latest release.

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On each node, the file /opt/mapr/conf/exports lists the clusters and mount points available to mount with NFS.

Access control for hosts

Specify access control for hosts with a space-separated list of hosts, appending (rw) for read-write or (ro) for read-only access after each host. To specify a default access for all hosts not otherwise specified, add (rw) or (ro) after a space at the end of a line. The exports file follows the same semantics as a standard UNIX exports table. The following export options are supported:

Export optionDefinition
roProvides read-only access.
rwProvides read-write access.
root_squash

Squashes root privileges for remote users.

For example, you can use:

/mapr (rw,root_squash)

This entry prevents the /mapr directory from being written to by the root user on remote hosts.

no_root_squashTurns off root squashing for remote users.
all_squashSquashes every remote user, including root.
anonuid, anongidSpecifies user and group IDs to use with remote users from a particular host. 

Restricting clusters to specific hosts

To restrict access to a specific export path to particular hosts, use the following format:

For example, the line /mapr/cluster1 host01(rw) host02(ro) restricts read-write access to the cluster in /mapr/cluster1 to host host01, and restricts read-only access to host host02. No other hosts have access.

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After making changes to this file, you do not have to restart the NFS server. You can run a maprcli command to refresh the exports definition without a restart. See nfsmgmt refresh exports.

Enabling Central Configuration

To enable Central Configuration for exports, specify a value for the AutoRefreshExportsTimeInterval parameter in the /opt/mapr/conf/nfsserver.conf file. The value of the AutoRefreshExportsTimeInterval parameter determines the number of minutes after which the NFS server refreshes the exports file. The default value of 0 disables central configuration for NFS exports.

Sample exports file

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