the following is the content of the shell script, /bin/setip written by me.
#!/bin/bash
PATH="$PATH:/bin:/sbin"; export PATH; let gw=255-$1
net_file=/etc/network/interfaces host_file=/etc/hostname
# change ip address and gateway of the UML
cat $net_file | sed "s/address 192.168.1.*/address 192.168.1.$1/" > $net_file
cat $net_file | sed "s/gateway 192.168.1.*/gateway 192.168.1.$gw/" > $net_file
# change hostname of the UML echo uml_woody_$1 > $host_file
#reboot the UML reboot
exit 0;
-------------------------------------------------------------------------
and I'm using the following Perl script to remotely execute the shell script i
mentioned above. Here's the content of the perl script, config_net.pl:
#!/usr/bin/perl
$| = 1;
use Net::SSH::Perl; use Net::SCP::Expect;
die "Usage: $0 LAST_OCTECT\n" if (!$ARGV[0]);
$oldip = '192.168.1.127'; print "Running /bin/setip $ARGV[0]\n";
while ($error = Rpc($oldip, "/bin/setip $ARGV[0]")) {
print "UML not up yet. $error\n";
sleep 2;
}###############################################################################
sub Rpc {
my ($host,$cmd) = @_;
my $ssh;
print "Starting SSH\n";
eval { $ssh = Net::SSH::Perl->new($host, ['debug' => 'yes',]); };
if ($@) {
return "Failed to connect\n$@";
}
print "Logging into $host\n";
$ssh->login('root', 'root');my ($stdout, $stderr, $exit) = $ssh->cmd($cmd); print "Output: $stdout\n"; print "Error: $stderr\n"; return $exit; }
moreover, they way i use config_net.pl to remotely execute /bin/setip is like:
$config_net.pl uml_number
where uml_number is a number like 11
i found that SOMETIMES after i execute the script remotely, the file /etc/network/interfaces will be totally cleared, which is not my purpose. But, SOMETIMES it works very well.
I wonder where's the problem? is it on the schell script, or the perl script??
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