使用串口通信，在备机端使用如下脚本检测来自主机的心跳信号，一旦未接受次数超过指定记数，备机认为主机DOWN机，自动设置为主机的网络参数，顶替主机提供服务。
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# ! perl -w
use strict;
use Win32 :: SerialPort;
my $port = ' COM2 ' ; # serail port name registried in OS
my $count = 0 ; # count number of heartbeat-receiving failture
my $max_count = 5 ; # max fail count to be tolerated
my $interface = '
# ----------------------------------
# 接口 IP 配置
# ----------------------------------
pushd interface ip
# "local" 的接口 IP 配置
set address name="local" source=static addr=192.168.6.185 mask=255.255.255.0
set address name="local" gateway=192.168.6.65 gwmetric=0
set dns name="local" source=static addr=192.168.6.112 register=PRIMARY
add dns name="local" addr=192.168.6.201 index=2
set wins name="local" source=static addr=none
popd
# 接口 IP 配置结束
' ; # net inetrface config information
sub errlog {
# log the failtrue occuring time
open ERR , ' >>err.log ' ;
my @time = localtime ();
my $time = sprintf ( " %d " , $time [ 5 ] + 1900 )
. ' - '
. sprintf ( " %d " , $time [ 4 ] + 1 )
. ' - '
. " $time[3] "
. ' '
. sprintf ( " %.2d " , $time [ 2 ])
. ' : '
. sprintf ( " %.2d " , $time [ 1 ])
. ' : '
. sprintf ( " %.2d " , $time [ 0 ]);
print ERR $time . " \n " ;
close ERR;
}
sub ipchange {
# change ip addrress
open TMP , ' >tmp ' ;
print TMP $interface ;
close TMP;
eval {
system ' netsh -f tmp ' ;
unlink ' tmp ' ;
};
if ($@) { return 0 ;}
return 1 ;
}
my $ob = Win32 :: SerialPort -> new( $port ) or die " CANNOT OPEN $port " ;
# open serial port
eval {
# set serial port properties
$ob -> baudrate( 9600 );
$ob -> parity( ' none ' );
$ob -> databits( 8 );
$ob -> stopbits( 1 );
$ob -> handshake( ' none ' );
};
if ($@) { die ' SET FAILED ' ;}
$ob -> write_settings or die " CANNOT WRITE $port DRIVER " ;
# write to port driver to make it active
while ( 1 ) {
# loop receiving heartbeat from remote machine
# change ip address after designated count of failture
my ( $length , $result ) = $ob -> read ( 10 );
if ( $result ) {
$count = 0 ;
} elsif ( $count == $max_count ) {
errlog();
if (not ipchange()) { print ' IP CHANGE FAILED ' ; }
last ;
} else {
$count ++ ;
}
sleep ( 1 );
}
undef $ob ;
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