02-09-2009
That really depends on the commands you are running, and how well the app/script is written. Shell scripts and c++ apps (if written well) are fast and have a small foot print.
That said, if no attention is paid to what is being done with the app/script... things can get nasty quick.
Just watch for things that cause heavy I/O (searching the whole drive or worse nfs drive for text in a file), and also watch for things that will consume all memory or cpu.
Obviously test all scripts/apps on a test machine prior to running anywhere near production servers.
Watch the I/O, CPU, and Mem when you test.
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LEARN ABOUT DEBIAN
keepalived
keepalived(8) System Manager's Manual keepalived(8)
NAME
keepalived. - keepalive demon
SYNOPSIS
/usr/sbin/keepalived [-n] [-f keepalived.conf] [-d] [-h] [-v]
DESCRIPTION
The keepalived The keepalived server implements the vrrpd routing demon which enables routing failover for a pair (or set) of routers (or
LVS directors) and the keepalived demon which sets up and does the health checking of virtual services in a Linux Virtual Servier.
OPTIONS
--vrrp, -P
Only run the VRRP subsystem.
--check, -C
Only run the healthchecker subsystem.
--dont-release-vrrp, -V
leave (don't remove) VRRP VIPs & VROUTEs on daemon stop.
--dont-release-ipvs, -I
Dont remove IPVS topology on daemon stop.
--dont-fork, -n
Dont fork the daemon process.
--use-file, -f keepalived.conf_file
Use the specified configuration file.
--wdog-vrrp, -R
Define VRRP watchdog polling delay (default=5s)
--wdog-check, -H
Define healthchecker's watchdog polling delay (default=5s)
--dump-conf, -d
Dump the configuration data.
--log-console, -l
Log messages to local console.
--log-detail, -D
Detailed log messages (the default with the rc script provided).
--log-facility, -S
0-7 Set syslog facility to LOG_LOCAL[0-7] (default=LOG_DAEMON)
--help, -h
Display a short inlined help screen.
--version, -v
Display the version number.
FILES
/etc/keepalived/keepalived.conf
SEE ALSO
keepalived.conf(5)
AUTHORS
Joseph Mack
from inspection of the output of keepalived --help from keepalived-1.1.4
Jan 2004 keepalived(8)