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Verifying a Socket w/Perl

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Using a lowercase hostname is typical but I got sloppy on a Windows 7 installation, after all Windows is case insensitive, and I used a mixed case hostname. It raised an interesting error when installing Oracle Database 11g Release 2.

Enterprise manager configuration failed due to the following error –

Failed to allocate port(s) in the specified range(s) for the following process(es): JMS
[5540-5559], RMI [5520-5539], Database Control [5500-5519], EM Agent [3938] | [1830-1849]

Refer to the log file at C:\app\McLaughlinM\cfgtoollogs\dbca\orcl\emConfig.log for more details.

You can retry configuring this database with Enterprise Manager later by manually running C:\app\McLaughlinM\product\11.2.0\dbhome_1\bin\emca script.

After verifying the ports were available, it required testing the ability to form a socket. The quickest way to do that was installing ActiveState Perl and test the socket.

Server-side Perl code (server.pl):

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# Import socket library.
use IO::Socket;
 
# Create new socket.
my $sock = new IO::Socket::INET(
                 LocalAddr => 'mclaughlinmysql',
                 LocalPort => '5500',
                 Proto => 'tcp',
                 Listen => 5500,
                 Reuse => 5500);
 
# Kill the program when socket not created.
die "Could not create socket: $!\n" unless $sock;
 
# Set socket to listen for incoming request and loop while waiting.
my $new_sock = $sock->accept();
while(<$new_sock>) {
print $_; }
 
# Close the socket.
close($sock);

Server-side Perl code (client.pl):

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# Import socket library.
use IO::Socket;
 
# Create new socket.
my $sock = new IO::Socket::INET(
                 PeerAddr => 'mclaughlinmysql',
                 PeerPort => '5500',
                 Proto => 'tcp');
 
# Kill the program when socket not created.
die "Could not create socket: $!\n" unless $sock;
 
# Send string to socket.
print $sock "Hello there!\n";
close($sock);

These scripts help you check connectivity on a port. Run the server first in one command shell and the client second in another command shell. Then, the server-side program prints the “Hello There!” message sent from the client-side program.

You run the server with the following:

perl server.pl

and the client with this:

perl client.pl

Hope they help you verify viability through server ports.

Written by maclochlainn

August 23rd, 2012 at 12:35 am

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