This Perl script can be used for checking the Kernel Parameters
difference between 2 Linux machines.
# perl <scriptname>.pl
<first_server_kernel.txt> <second_server_kernel.txt>
#!/usr/bin/perl
# Description : This script can be used to list out of the differences in the Kernel Settings between 2 Linux Servers.
# It takes 2 files (consists of sysctl -a output) as input, upon execution it asks for User's choice either
# to List out all the Kernel parameter of 2 Servers or to list out only the Differences.
# Version : 1.1
# Execution method : Manual (by any normal user)
if( @ARGV != 2 )
{
print "\nUsage: $0 <First-file> <Second-file>\n\n";
print "First-file should contain 'sysctl -a' output taken from first Linux Machine\n\n";
print "Second-file should contain 'sysctl -a' output taken from Second Linux Machine\n\n";
exit 1;
}
open(File1, "$ARGV[0]" );
open(File2, "$ARGV[1]" );
my @first_file = <File1>;
my @second_file = <File2>;
my %output1, %output2, %kerparm;
my ($cnt1,$cnt2) = (0,0);
print "\nEnter '1' for Listing all Kernel parameters or '2' to list only the Differences : ";
my $choice=<STDIN>;
chomp($choice);
system $^O eq 'MSWin32' ? 'cls' : 'clear';
printf("%-50s %-25s %-50s\n\n", "KERNEL PARAMETER", "FIRST SERVER", "SECOND SERVER");
foreach $i(@first_file) {
$i =~ s/\s+$//;
@array1 = split(" = ",$i);
$output1{$array1[0]} = $array1[1];
$cnt1++;
$kerparm{$array1[0]} = $cnt1;
}
foreach $j(@second_file) {
$j =~ s/\s+$//;
@array2 = split(" = ",$j);
$output2{$array2[0]} = $array2[1];
$cnt2++;
$kerparm{$array2[0]} = $cnt2;
}
foreach $key (sort keys %kerparm)
{
$output1{$key} = "" unless defined $output1{$key};
$output2{$key} = "" unless defined $output2{$key};
if($choice eq '1') {
printf("%-50s %-25s %-50s\n", $key,$output1{$key},$output2{$key}); }
elsif($choice eq '2') {
printf("%-50s %-25s %-50s\n", $key,$output1{$key},$output2{$key}) if ($output1{$key} ne $output2{$key});
}
}
All you got to do is, take the
‘sysctl –a’ output into a file from each Linux machine that you wish to compare
and give it as an input for this script like shown below:
Upon execution, you need to choose option 1 or 2. ‘1’
is for listing out all the kernel parameter values of both servers in tabular
form and ‘2’ for listing out only the parameters that are either differing or
non-exist on other server.
#!/usr/bin/perl
# Description : This script can be used to list out of the differences in the Kernel Settings between 2 Linux Servers.
# It takes 2 files (consists of sysctl -a output) as input, upon execution it asks for User's choice either
# to List out all the Kernel parameter of 2 Servers or to list out only the Differences.
# Version : 1.1
# Execution method : Manual (by any normal user)
if( @ARGV != 2 )
{
print "\nUsage: $0 <First-file> <Second-file>\n\n";
print "First-file should contain 'sysctl -a' output taken from first Linux Machine\n\n";
print "Second-file should contain 'sysctl -a' output taken from Second Linux Machine\n\n";
exit 1;
}
open(File1, "$ARGV[0]" );
open(File2, "$ARGV[1]" );
my @first_file = <File1>;
my @second_file = <File2>;
my %output1, %output2, %kerparm;
my ($cnt1,$cnt2) = (0,0);
print "\nEnter '1' for Listing all Kernel parameters or '2' to list only the Differences : ";
my $choice=<STDIN>;
chomp($choice);
system $^O eq 'MSWin32' ? 'cls' : 'clear';
printf("%-50s %-25s %-50s\n\n", "KERNEL PARAMETER", "FIRST SERVER", "SECOND SERVER");
foreach $i(@first_file) {
$i =~ s/\s+$//;
@array1 = split(" = ",$i);
$output1{$array1[0]} = $array1[1];
$cnt1++;
$kerparm{$array1[0]} = $cnt1;
}
foreach $j(@second_file) {
$j =~ s/\s+$//;
@array2 = split(" = ",$j);
$output2{$array2[0]} = $array2[1];
$cnt2++;
$kerparm{$array2[0]} = $cnt2;
}
foreach $key (sort keys %kerparm)
{
$output1{$key} = "" unless defined $output1{$key};
$output2{$key} = "" unless defined $output2{$key};
if($choice eq '1') {
printf("%-50s %-25s %-50s\n", $key,$output1{$key},$output2{$key}); }
elsif($choice eq '2') {
printf("%-50s %-25s %-50s\n", $key,$output1{$key},$output2{$key}) if ($output1{$key} ne $output2{$key});
}
}
