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City LinUX sample scripts - iptkovr

NAME

iptkovr - monitors a remote ip and assigns that ip to a virtual interface on another host if it becomes unavailable.

SYNOPSIS

iptkovr [ -c <config_file> ] [ -d ] [ -v ] [ config_id> ]

AVAILABILITY

iptkovr is a Bourne shell script which should work equally well on all versions of UNIX, Linux and Mac OS X.

DESCRIPTION

iptkovr uses the configuration id as a lookup key to the configuration file /usr/local/etc/iptkovr.cf to find essential details. The target host's IP address is monitored using ping . The interval between pings may be set in configuration\ file but otherwise defaults to 10 seconds.

if the target host does not respond iptkovr will wait for a further sleep period then try one more time before concluding that the target is not going to come back on line.

The target IP is then assigned to a virtual interface on the backup/clone server.

OPTIONS

-c Use the specified configuration file in preference to the default "/usr/local/etc/iptkovr.cf" . If no configuration file is found the script will terminate with an error message.

-d Set debug mode on. The -x option is set within the shell and each command in the script is echoed to the console.

-v When set iptkovr will report significant actions to standard error.

< config_id > The configuration identity is the key to the stanza in the configuration file which will be used to determine the required URI for the stats report.

FILES

iptkovr.cf.

EXAMPLES

	iptkovr -v memnon

BUGS

The script is quite crude and has very little, if any, error checking. The consequences of unexpected input are untested.

AUTHOR

Clifford W Fulford, City Linux. Contact fulford@fulford.net or +44 (0)709 229 5385.

Trainer

Picture of Clifford W Fulford - IT consultant
Clifford W Fulford BA(Hons), PGDip (Computing), PGCE. DES/DFE No. 7773034.

I started my career in computing in the days of CPM and C/CPM, building network operating systems and correcting bespoke software written to manage community transport booking and accounting systems.

I fist came across UNIX when called upon to migrate database systems from Mercator BBS to Thoroughbred Basic. Excited by the power and flexibility of UNIX in 1989/90 I studied the OS at City University night classes while developing my practical skills in a SCO Xenix environment during the working day.

In 1994 I was introduced to Linux by students in the School of Mathematics and Computing at North London University. Although initially sceptical of the ability of the fledgling OS to meet the requirements of large scale mission critical systems, I rapidly became a convert to Linux in a corporate environment.

I have now worked professionally as a systems manager and systems administrator with Xenix, AIX, HPUX, SunOS, Solaris and Linux in the City, Antwerp, McLean Virginia, Cairo, Birmingham and Nottingham for over 25 years

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