User Management in Java

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User Management
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Disk quotas are very restrictive, and when a user exceeds their limit they do not often understand what has happened. Usually, users do not even get a message unless they are logging in. Quotas also prevent users from creating large temporary files which can be a problem when compiling programs. They carry with them a system overhead, which makes everything run a little slower.
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In some environments the idea of deleting a user's files is too horrifying to contemplate. In a company or research laboratory one might want to be extremely careful in such a practice. In other cases, like schools and universities, this is pure necessity. Deciding whether to delete files automatically must be a policy decision. It might be deemed totalitarian to delete files without asking. On the other hand, this is often the only way to ever clear anything up. Many users will be happy if they do not have to think about the problem themselves. A tidy policy, rather than a quota policy, gives users a greater illusion of freedom, which is good for system morale. We must naturally be careful never to delete files which cannot be regenerated or reacquired if necessary. File tidying was first suggested by Zwicky in ref. [288], within a framework of quotas. See also refs [106, 37]. A useful strategy is to delete files one is not sure about only if they have not be accessed for a certain period of time, say a week. This allows users to use files freely as long as they need to, but prevents them from keeping the files around for ever. Cfengine can be used to perform this task. For example, a simple cfengine program would look like: control: actionsequence= ( tidy ) mountpattern= ( /site/host ) homepattern = ( home )
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tidy: home home home home home home home pattern=core pattern=a.out pattern=*% pattern=* pattern=*.o pattern=*.aux pattern^*.mp3 recurse: = inf recurse: = inf recurse: = inf recurse: = inf recurse: = inf recurse: = inf recurse: = inf age=3 age=3 age=3 age=l age=3 age=14
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This script iterates automatically over all users' home directories, and recurses into them, deleting files if the time since they were last accessed exceeds the time limits specified. Care should be always taken in searching for and deleting patterns containing 'core'. Some operating systems keep directories called core, while others have files called c o r e . h . As long as the files are plain files with an exact name match, one if usually safe.
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Controlling User Resources
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Quotas and Limits
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Although we should never forget that computers exist for their users, it is also important to understand that users are the greatest threat to the stability of their computers. Two or three generations have now grown up with computers in their homes, but these computers were private machines which were not (until recently) attached to a network. They were not part of an organization with many users - they were used by perhaps one or two family members. In short, users have grown up thinking that what they do with their computers is nobody's business but their own. That is not a good attitude in a network community. In a shared environment, all users share the same machine resources. If one user is selfish, that affects all of the other users. Given the opportunity, users will consume all of the disk space and all of the memory and CPU cycles somehow, whether through greed or simply through inexperience. Thus it is in the interests of the user community to limit the ability of users to spoil things for other users. One way of protecting operating systems from users and from faulty software is to place quotas on the amount of system resources which they are allowed: Disk quotas: place fixed limits on the amount of disk space which can be used per user. The advantage of this is that the user cannot use more storage than this limit; the disadvantage is that many software systems need to generate/cache large temporary files (e.g. compilers or web browsers), and a fixed limit means that these systems will fail to work as a user approaches his/her quota. CPU time limit: some faulty software packages leave processes running which consume valuable CPU cycles to no use. Users of multi-user computer systems occasionally steal CPU time by running huge programs which make the system unusable for others. The C-shell limit cputime function can be globally configured to help prevent accidents. Policy decisions: users collect garbage. To limit the amount of it, one can specify a system policy which includes items of the form: 'Users may not have mp3, wav, mpeg, etc., files on the system for more than one day'. To enforce such a policy, see section 5.5.
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Quotas have an unpleasant effect on system morale, since they restrict personal freedom. They should probably only be used as a last resort. There are other ways of controlling the build up of garbage, see section 5.5. Principle 20 (Freedom) Quotas, limits and restrictions tend to antagonize users. Users place a high value on personal freedom. Restrictions should be minimized. Workaround solutions which avoid rigid limits are preferable, if possible. 5.5.3 Killing Old Processes
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Processes sometimes do not get terminated when they should. There are several reasons for this. Sometimes users forget to log out, sometimes poorly written terminal software does not properly kill its processes when a user logs out. Sometimes background programs simply crash or go into loops from which they never return. One way to clean up processes in a work environment is to look for user processes which have run for more than a day. (Note that the assumption here is that everyone is supposed to log out each day and then log in again the next day - that is not always the case.) Cfengine can also be used to clean up old
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