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Table 37-1: The /etc/exports Options Description Requires that request originate on secure ports, those less than 1024. This is on by default. Turns off the secure option. Allows only read-only access. This is the default. Allows read-write access. Perform all writes when requested. This is the default. Perform all writes when the server is ready. Perform writes immediately, not checking to see if they are related. Check to see if writes are related, and, if so, wait to perform them together. Can degrade performance. This is the default. Automatically hide an exported directory that is the subdirectory of another exported directory. The subdirectory has to be explicitly mounted to be accessed. Mounting the parent directory does not allow access. This is the default. Do not hide an exported directory that is the subdirectory of another exported directory (opposite of hide). Only works for single hosts and can be unreliable. Check parent directories in a file system to validate an exported subdirectory. This is the default. Do not check parent directories in a file system to validate an exported subdirectory. Do not require authentication of locking requests. Used for older NFS versions. Maps all uids and gids to the anonymous user. Useful for NFSexported public FTP directories, news spool directories, and so forth. The opposite option to all_squash, and is the default setting. Maps requests from remote root user to the anonymous uid/gid. This is the default. Turns off root squashing. Allows the root user to access as the remote root. Set explicitly the uid and gid of the anonymous account used for all_squash and root_squash options. The defaults are nobody and nogroup.

update the meter display, and also they are made to abandon the behavior once the line on the oor is sensed by the rSense() function. RoamAround is the same as discussed in Chap. 5 but with the added call to BatteryMeter to update the display and the value Battery. There is also a check to see if the battery charge level is below the LOW_LEVEL threshold to be able to abandon the behavior.

You can have several host entries for the same directory, each with access to that directory:

directory-pathname host(options) host(options) host(options)

Define the main terms used for the setup of the scheme, such as systemic, market, credit, and operational risk. Review the methodologies, assumptions, and conditions connected to these terms. Structure the characteristics of the different risk areas in such a way that the screening of these risk areas allows comparison of the different risk areas for economic and regulatory purposes.

You have a great deal of flexibility when specifying hosts. For hosts within your domain you can just use the hostname, whereas for those outside you need to use a fully qualified domain name. You could also just use the host's IP address. Instead of just a single host, you can reference all the hosts within a specific domain, allowing access by an entire network. A simple way to do this is to use the * for the host segment, followed by the domain name for the network, such as *.mytrek.com for all the hosts in the mytrek.com network. Instead of domain names, you could use IP network addresses using a CNDR format where you specify the netmask to indicate a range of IP addresses. You can also use an NIS netgroup name to reference a collection of hosts. The NIS netgroup name is preceded by an @ sign.

13.4 Summary

directory directory directory directory directory host(options) *(options) *.domain(options) 192.168.1.0/255.255.255.0(options) @netgroup(options)

Options in /etc/exports operate as permissions to control access to exported directories Readonly access is set with the ro option, and read-write with the rw option The snyc and async options specify whether a write operation is performed immediately (sync) or when the server is ready to handle it (async) By default, write requests are checked to see if they are related, and, if so, are written together (wdelay) This can degrade performance You can override this default with no_wdelay and have writes executed as they are requested If two directories are exported, where one is the subdirectory of another, then the subdirectory is not accessible unless it is explicitly mounted (hide) In other words, mounting the parent directory does not make the subdirectory accessible The subdirectory remains hidden until also mounted You can overcome this restriction with the no_hide option (though this can cause problems with some file systems).

In this chapter you have: Learned about RobotBASIC s simulated battery and how to use it in a program. Seen how several of the algorithms from previous chapters can be combined to give the robot the ability to locate a charging station, dock with it, and replenish its battery. Seen how to organize a program using a subroutines hierarchy chart. Learned how to use programming to simulate real-time actions. Seen more examples of how to reuse previously developed behaviors and algorithms with slight changes to achieve new behaviors. Now, try to do the exercises in the next section.