\input texinfo @c -*-texinfo-*-
@c %**start of header
@setfilename readme.info
@settitle Perl IPC::Locker Installation
@c %**end of header
@c DESCRIPTION: TexInfo: DOCUMENT source run through texinfo to produce README file
@c Use 'make README' to produce the output file
@c Before release, run C-u C-c C-u C-a (texinfo-all-menus-update)
@node Top, Copyright, (dir), (dir)
@chapter IPC::Locker
This is the IPC::Locker Perl Package.
@menu
* Copyright::
* Description::
* Obtaining Distribution::
* Supported Systems::
* Installation::
@end menu
@node Copyright, Description, Top, Top
@section Copyright
This package is Copyright 1999-2017 by Wilson Snyder @email{wsnyder@@wsnyder.org}.
This program is free software; you can redistribute it and/or modify
it under the terms of either the GNU Lesser General Public License
Version 3 or the Perl Artistic License Version 2.0.
This code is provided with no warranty of any kind, and is used entirely at
your own risk.
@node Description, Obtaining Distribution, Copyright, Top
@section Description
This package provides a server for locks and a package for clients to access
that server. The result is that clients can access named locks on a Internet
wide bases, solving critical section problems without the mess of NFS or other
file locking techniques.
@subsection IPC::Locker
IPC::Locker is a Perl package which allows cross cluster locking. For example:
@example
my $lock = IPC::Locker->lock(host=>'example.std.com');
... Critical section ...
$lock->unlock();
@end example
See @samp{man IPC::Locker} after installation.
@subsection lockerd
lockerd is the daemon that supports IPC::Locker. See @samp{man
lockerd} after installation.
@subsection IPC::PidStat
IPC::PidStat is a Perl package which answers the question, ``is pid X
running on host Y?''. See @samp{man IPC::PidStat} after installation.
@subsection pidstat
pidstat is a program which answers the question, ``is pid X
running on host Y?''. See @samp{man pidstat} after installation.
@subsection pidstatd
pidstat is the daemon that supports IPC::PidStat and pidstat. See
@samp{man pidstatd} after installation.
@subsection pidwatch
pidwatch is a program which starts other programs, and kill that program
when another job exists. See @samp{man pidwatch} after installation.
@subsection uriexec
uriexec is a simple wrapper which allows executing a command which is
quoted using URI escapes. This prevents layered shells from
interpreting special characters. See @samp{man uriexec} after
installation.
@subsection check_lockerd and check_pidstatd
check_lockerd and check_pidstatd are Nagios plugins to check lockerd
and pidstatd. See the Nagios documentation
@uref{http://www.nagios.org} for information on installing plugins.
@node Obtaining Distribution, Supported Systems, Description, Top
@section Obtaining Distribution
The latest version is available at
@uref{http://www.perl.org/CPAN/}
Download the latest package from that site, and decompress.
@samp{gunzip IPC::Locker_version.tar.gz ; tar xvf IPC::Locker_version.tar}
@node Supported Systems, Installation, Obtaining Distribution, Top
@section Supported Systems
This version of IPC::Locker has been built and tested on:
@itemize @bullet
@item i386-linux
@item sparc-sun-solaris2.7
@end itemize
It should run on any system with perl and TCP/IP socketing.
@node Installation, , Supported Systems, Top
@section Installation
@enumerate
@item
@code{cd} to the directory containing this README notice.
@item
Type @samp{perl Makefile.PL} to configure IPC::Locker for your system.
@item
Type @samp{make} to compile IPC::Locker.
@item
Type @samp{make test} to check the compilation.
@item
Type @samp{make install} to install the programs and any data files and
documentation.
@item
You may wish to install @samp{lockerd} and @samp{pidstatd} in a
init.rc file so that it is run at system startup. Depending on your
distribution, you may be able to just:
@samp{cp init.d/lockerd /etc/init.d/lockerd} (On one server only)
@samp{cp init.d/pidstatd /etc/init.d/pidstatd} (On all machines)
Edit paths in above to point to /usr/bin instead of /usr/local/bin, if needed.
@samp{/etc/init.d/lockerd start} (On one server only)
@samp{/etc/init.d/pidstatd start} (On all machines)
@samp{chkconfig lockerd on} (On one server only)
@samp{chkconfig pidstatd on} (On all machines)
If you get "This account is currently not available." you need to
change the daemon account from a shell of /sbin/nologin to /sbin/bash.
@item
If you are using Nagios (@url{http://www.nagios.org}), sample scripts
to check the daemons are included in the nagios subdirectory.
@end enumerate