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Operating Systems
OS X (Apple)
Apple Perl and LDAP
Post 302407114 by superstructure on Wednesday 24th of March 2010 02:35:11 PM
03-24-2010
Apple Perl and LDAP
We have come across some strange and rather annoying behaviour of Apple's implementation of Perl and LDAP.
I am part of a small scientific software company that provides specialist software for life sciences.
Our internal network is driven by linux servers, but we also have a number of intel Mac's, as many of our customers are using Mac's as well. User accounts on our network are set up and information propogated using LDAP.
Some of our software makes use of some perl scripts.
We have noticed that if we log in to one of the Snow Leopard machines (via ssh) and run our software in the background and then log off before the job finishes, then frequently the job will crash with an error perl: no user <uid>.
If you do not log off, the job completes correctly. This appears to be related to the directory services cache - dscachutil -list will correctly return user information if you are logged in. If you run in the background and log off, it returns nothing.
If, however, we install a different perl install, say Activestate perl, then this problem disappears - we can submit jobs in the background and log off and the jobs finish correctly.
Has anyone else observed this and more importantly, is there a simple solution that doesn't involve installing a new perl distribution?
I am part of a small scientific software company that provides specialist software for life sciences.
Our internal network is driven by linux servers, but we also have a number of intel Mac's, as many of our customers are using Mac's as well. User accounts on our network are set up and information propogated using LDAP.
Some of our software makes use of some perl scripts.
We have noticed that if we log in to one of the Snow Leopard machines (via ssh) and run our software in the background and then log off before the job finishes, then frequently the job will crash with an error perl: no user <uid>.
If you do not log off, the job completes correctly. This appears to be related to the directory services cache - dscachutil -list will correctly return user information if you are logged in. If you run in the background and log off, it returns nothing.
If, however, we install a different perl install, say Activestate perl, then this problem disappears - we can submit jobs in the background and log off and the jobs finish correctly.
Has anyone else observed this and more importantly, is there a simple solution that doesn't involve installing a new perl distribution?
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LEARN ABOUT DEBIAN
ncftpbatch
ncftpbatch(1) General Commands Manual ncftpbatch(1) NAME
ncftpbatch - Individual batch FTP job processor SYNOPSIS
ncftpbatch -d ncftpbatch -l ncftpbatch -D OPTIONS
Command line flags: -d Begin background processing of FTP jobs in the current user's $HOME/.ncftp/spool directory. This returns immediately, because a daemon process is spawned and ran in the background. -l Lists the contents of the user's job queue. -D This is like -d, except that the process does not become a daemon. DESCRIPTION
This program is responsible for processing background FTP requests. It is normally only run by ncftp and not manually by a human being, however you can run it to manually process the FTP job queue. The jobs are spool files written to a user's $HOME/.ncftp/spool directory and have a special format and file-naming convention (which con- tains when the job is to be run). ncftp runs this program when it needs to, but if the ncftpbatch daemon dies unexpectedly the jobs that are left in the queue will not be processed until another instance of ncftpbatch is run. ncftpget and ncftpput can also be used to submit jobs for batch processing, using those utilities' -b command-line flag. If desired, you can also manually create the spool files although this procedure is not documented here (see the manual page for ncftpspooler for more information on how to do that). DIAGNOSTICS
ncftpbatch writes to its own log file, the $HOME/.ncftp/spool/log file. This file should be examined to determine if any ncftpbatch pro- cesses are actively working on jobs. AUTHOR
Mike Gleason, NcFTP Software (http://www.ncftp.com). SEE ALSO
ncftp(1), ncftpput(1), ncftpget(1). ncftpbatch NcFTP Software ncftpbatch(1)