Mikael Nordin
8 years ago
committed by
GitHub
parent
55ee7e50e1
commit
8b29f1938f
@ -1,188 +0,0 @@
|
||||
#!/usr/bin/env perl
|
||||
use warnings;
|
||||
use strict;
|
||||
use bignum;
|
||||
use Sys::Hostname;
|
||||
use File::Compare;
|
||||
use File::Copy;
|
||||
use File::Temp;
|
||||
|
||||
my $num_args = $#ARGV + 1;
|
||||
if ($num_args < 2) {
|
||||
print "\nUsage: $0 <user> <shared directory> [cron spool directory]\n";
|
||||
exit;
|
||||
}
|
||||
|
||||
# We need a common directory for our nodes to write and read state from plus a couple of cronfiles
|
||||
my ($user, $shareddir, $spooldir) = @ARGV;
|
||||
|
||||
# Set some defaults if we didn't get them
|
||||
unless ($spooldir) {
|
||||
$spooldir = "/var/spool/cron/crontabs";
|
||||
}
|
||||
|
||||
my $sharedcrondir = "$shareddir/crontab";
|
||||
my $cronfile = "$spooldir/$user";
|
||||
my $activesharedcronfile = "$sharedcrondir/$user";
|
||||
my $oldactivesharedcronfile = "$sharedcrondir/$user.old";
|
||||
my $electiondir = "$sharedcrondir/election";
|
||||
my $hostname = hostname;
|
||||
my $failovertimeout = 40;
|
||||
|
||||
|
||||
# Create directories
|
||||
unless (-d $sharedcrondir) {
|
||||
mkdir $sharedcrondir or die "Can not create shared directory: $!";
|
||||
}
|
||||
|
||||
|
||||
|
||||
# Get the nodes in the cluster
|
||||
sub get_nodes {
|
||||
# Our data type is a hash with the following fields
|
||||
# name, time, numeric
|
||||
my @nodes = ();
|
||||
my @files = <$electiondir/*>;
|
||||
foreach my $filename (@files) {
|
||||
chomp $filename;
|
||||
my $nodename = $filename;
|
||||
$nodename =~ s/^$electiondir\///;
|
||||
# Don't add this host
|
||||
unless ($nodename eq $hostname) {
|
||||
my $node = {};
|
||||
open(FILE, "<$filename") or die "Could not open file: $!";
|
||||
$node->{'name'} = $nodename;
|
||||
my $content = <FILE>;
|
||||
chomp $content;
|
||||
$node->{'time'} = $content;
|
||||
$node->{'numeric'} = get_numeric($nodename);
|
||||
close FILE;
|
||||
push @nodes, $node;
|
||||
}
|
||||
}
|
||||
return @nodes;
|
||||
|
||||
|
||||
}
|
||||
|
||||
|
||||
# Simply write a unix timestamp to a file with our name on it
|
||||
sub write_timestamp {
|
||||
my $time = time;
|
||||
open(FILE,"+>$electiondir/$hostname");
|
||||
print FILE $time;
|
||||
close FILE;
|
||||
|
||||
}
|
||||
|
||||
# Lets see if we are the active node
|
||||
sub is_active {
|
||||
|
||||
my @nodes = @_;
|
||||
|
||||
# Assume you are active
|
||||
my $state = 1;
|
||||
# Loop all nodes
|
||||
foreach my $node (@nodes) {
|
||||
# If it has been active in the last 120 seconds it is eligable
|
||||
my $diff = time - $node->{'time'};
|
||||
if( $diff < $failovertimeout ) {
|
||||
print "Node: $node->{'name'} was active last $failovertimeout sec\n";
|
||||
# Go to passive mode if the numeric of that host is less than that of this host
|
||||
my $this = get_numeric($hostname);
|
||||
my $that = $node->{'numeric'};
|
||||
print "Numeric for $hostname is $this and for $node->{'name'} is $that\n";
|
||||
if( $this > $that ) {
|
||||
$state = 0 ;
|
||||
print "I am not active\n";
|
||||
} else {
|
||||
print "I am active\n";
|
||||
my $outfile = "/var/lib/thruk/crontab/active";
|
||||
open(OUTFILE,"+>$outfile");
|
||||
print OUTFILE $hostname;
|
||||
close OUTFILE;
|
||||
}
|
||||
} else {
|
||||
print "Node: $node->{'name'} was not active last 120 sec\n";
|
||||
|
||||
}
|
||||
}
|
||||
return $state;
|
||||
}
|
||||
|
||||
# Turn a hostname in to a decimal number used for comparison, lowest numer gets to be active if it is working
|
||||
sub get_numeric {
|
||||
my ($host) = @_;
|
||||
my @ascii = unpack 'C*', $host;
|
||||
my $numeric = '';
|
||||
foreach my $val (@ascii) {
|
||||
$numeric .= $val;
|
||||
}
|
||||
return $numeric + 0;
|
||||
}
|
||||
|
||||
sub cron_compare {
|
||||
my ($one, $two, $three) = @_;
|
||||
|
||||
# Current cronfile and shared cronfile is not same
|
||||
if(compare($one, $two) != 0) {
|
||||
|
||||
print "$one and $two is not the same\n";
|
||||
|
||||
# This means that the other node has changed the cron file
|
||||
if(compare($one, $three) == 0) {
|
||||
|
||||
print "Some other node has changed the file\n";
|
||||
return 1;
|
||||
# This means that my node has changed the cron file
|
||||
} else {
|
||||
|
||||
print "This node has changed the cron file\n";
|
||||
return 2;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
sub run {
|
||||
print "Host: $hostname started run at: " . time . "\n";
|
||||
print "User: $user, shareddir: $shareddir and spooldir: $spooldir\n";
|
||||
|
||||
if(-e $activesharedcronfile) {
|
||||
unless(-e $oldactivesharedcronfile) {
|
||||
copy($activesharedcronfile, $oldactivesharedcronfile);
|
||||
}
|
||||
}
|
||||
|
||||
unless (-d $electiondir) {
|
||||
mkdir $electiondir;
|
||||
}
|
||||
# Update timestamp
|
||||
write_timestamp;
|
||||
is_active(get_nodes);
|
||||
my $compare = cron_compare($cronfile, $activesharedcronfile, $oldactivesharedcronfile );
|
||||
# The other node has changed the file
|
||||
if($compare == 1) {
|
||||
copy($activesharedcronfile, $cronfile);
|
||||
copy($activesharedcronfile, $oldactivesharedcronfile);
|
||||
# We have changed things
|
||||
} elsif ($compare == 2) {
|
||||
copy($cronfile, $activesharedcronfile);
|
||||
}
|
||||
|
||||
print "Host: $hostname finished run at: " . time . "\n\n\n";
|
||||
}
|
||||
|
||||
for (my $i = 0; $i < 6; $i++) {
|
||||
my $start = time;
|
||||
$| = 1;
|
||||
run;
|
||||
if ((my $remaining = 10 - (time - $start)) > 0) {
|
||||
sleep $remaining;
|
||||
}
|
||||
}
|
||||
|
||||
exit;
|
||||
|
||||
Loading…
Reference in new issue