Subversion Repositories havirt

#! /usr/bin/env perl

use strict;

use warnings;

# havirt

# Basically an extension of virsh which will perform actions on virtuals 

# running on multiple, connected hypervisors (virsh calls them nodes)

# existing as a cluster of hypervisors where virtuals can be shut down,

# started and migrated at need.

#

# Progam consists of one executable (havirt) and multiple Perl Modules

# (*.pm), each of which encompasses a function. However, this is NOT

# written as an Object Oriented system.

#

# havirt --help gives a brief help screen.

# Copyright 2024 Daily Data, Inc.

# 

# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following 

# conditions are met:

#

#   Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

#   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer 

#   in the documentation and/or other materials provided with the distribution.

#   Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived

#   from this software without specific prior written permission.

# 

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

# NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#use experimental "switch";

# requires File::Slurp. 

# In Debian derivatives

# apt install libfile-slurp-perl

# apt install libxml-libxml-perl libyaml-tiny-perl

BEGIN {

   use FindBin;

   use File::Spec;

   # use libraries from the directory this script is in

   use lib File::Spec->catdir($FindBin::Bin);

}

use havirt; # Load all our shared stuff

use Data::Dumper;

use YAML::Tiny;

# global variables

my $scriptDir = $FindBin::RealBin;

my $scriptName = $FindBin::Script;

my $confDir = "$scriptDir/conf";

my $dbDir = "$scriptDir/var";

our $nodeDBName = "$dbDir/node.yaml";

my $domainDBName = "$dbDir/domains.yaml";

our $nodePopulationDBName = "$dbDir/node_population.yaml";

# these contain the values from the databases

# loaded on demand

our $nodeDB;

our $virtDB;

our $nodePopulations;

my $dryRun = 1;

my $DEBUG = 0;

sub help {

   print "$0 command [argument]\n";

   print "where command is one of\n";

   print "\tnode update [node] [node]... # update a given node (or ALL)\n";

   print "\tnode list # display tab delimited list of node specs\n";

   print "\tnode scan # find domains on all nodes\n ";

   print "\tdomain update ALL|RUNNING|[domain] [domain]... # update domains\n";

   print "\tdomain list ALL|RUNNING|[domain] [domain]... # display tab delimited list of domain specs\n";

   print "\tcluster status # report of memory and vcpu status on all nodes\n";

}

sub loadVirtDB {

   return if $virtDB;

   $virtDB = &readDB( $domainDBName );

}

sub loadNodePopulations {

   return if $nodePopulations;

   $nodePopulations = &readDB( $nodePopulationDBName );

}

sub domain {

   my $action = lc shift;

   my $return = '';

   &loadVirtDB();

   &loadNodePopulations();

   @_ = keys( %$virtDB ) if ( $_[0] && $_[0] eq 'ALL' );

   if ( $_[0] && $_[0] eq 'RUNNING' ) {

      my @running;

      foreach my $node ( keys %$nodePopulations ) {

         push @running, keys %{ $nodePopulations->{$node}->{'running'} };

      }

      @_ = @running;

   }

   if ( $action eq 'update' ) { # download xml to var and update database

      while ( my $virt = shift ) {

         &parseDomain( $virt );

      } # while

      &writeDB( $domainDBName, $virtDB );

   } elsif ( $action eq 'list' ) { # dump domain as a tab separated data file

      my @return;

      foreach my $node ( keys %$nodePopulations ) {

         foreach my $virt (keys %{$nodePopulations->{$node}->{'running'}} ) {

            push @return, &listDomain( $virt, $node );

         }

      }

      $return = join( "\n", sort @return ) . "\n";;

   }

   return $return;;

} # sub domain

sub listDomain {

   my ($virt,$node) = @_;

   my @return;

   push @return, $virt;

   push @return, $node;

   foreach my $column ( sort keys %{ $virtDB->{$virt} } ) {

      push @return, $virtDB->{$virt}->{$column};

   }

   return join( "\t", @return);

}

# get the XML definition file of a running domain off of whatever

# node it is running on, and save it to disk

sub getVirtConfig {

   my ($virt,$filename) = @_;

   my $return;

   print "In getVirtConfig looking for $virt with file $filename\n" if $DEBUG;

   if ( -f $filename ) {

      open XML, "<$filename" or die "Could not read from $filename: $!\n";

      $return = join( '', <XML> );

      close XML;

   } else {

      &loadNodePopulations();

      #die Dumper( $nodePopulations );

      foreach my $node ( keys %$nodePopulations ) {

         print "getVirtConfig Looking on $node for $virt\n";

         if ( exists( $nodePopulations->{$node}->{'running'}->{$virt} ) ) { # we found it

            print "Found $virt on node $node\n";

            $return = `ssh $node 'virsh dumpxml $virt'`;

            open XML,">$filename" or die "Could not write to $filename: $!\n";

            print XML $return;

            close XML;

         } # if

      } # foreach

   } # if..else

   return $return;

} # sub getVirtConfig

sub getXMLValue {

   my ( $key, $string ) = @_;

   my $start = "<$key";

   my $end = "</$key>";

   $string =~ m/$start([^>]*)>([^<]+)$end/;

   return ($1,$2);

}

sub parseDomain {

   my ($virt, $nodePopulations ) = @_;

   my @keysToSave = ( 'uuid', 'memory', 'vcpu' );

   my $filename = "$confDir/$virt.xml";

   my $xml = &getVirtConfig( $virt, $filename );

   my ($param,$value) = &getXMLValue( 'uuid', $xml );

   $virtDB->{$virt}->{'uuid'} = $value;

   ($param,$value) = &getXMLValue( 'memory', $xml );

   $virtDB->{$virt}->{'memory'} = $value;

   ($param,$value) = &getXMLValue( 'vcpu', $xml );

   $virtDB->{$virt}->{'vcpu'} = $value;

   $xml =~ m/type='vnc' port='(\d+)'/;

   $virtDB->{$virt}->{'vnc'} = $1;

}

sub cluster {

   my $action = lc shift;

   my $return = '';

   if ( $action eq 'status' ) {

      &loadVirtDB();

      &loadNodePopulations();

      &loadNodeDB();

      print "Node\tThreads\tMemory\tDomains\tvcpu\tmem_used\n";

      my $usedmem = 0;

      my $usedcpu = 0;

      my $availmem = 0;

      my $availcpu = 0;

      my $totalDomains = 0;

      foreach my $node (sort keys %$nodeDB ) {

         my $memory = 0;

         my $vcpus = 0;

         my $count = 0;

         foreach my $domain ( keys %{ $nodePopulations->{$node}->{'running'} } ) {

            $memory += $virtDB->{$domain}->{'memory'};

            $vcpus += $virtDB->{$domain}->{'vcpu'};

            $count++;

         }

         $return .= "$node\t$nodeDB->{$node}->{cpu_count}\t$nodeDB->{$node}->{memory}\t$count\t$vcpus\t$memory\n";

         $usedmem += $memory;

         $usedcpu += $vcpus;

         $totalDomains += $count;

         $availmem += $nodeDB->{$node}->{memory};

         $availcpu += $nodeDB->{$node}->{cpu_count};

      } # outer for

      $return .= "Total\t$availcpu\t$availmem\t$totalDomains\t$usedcpu\t$usedmem\n";

   }

   return $return;

}

#my $config = &readConf( $confFile );

my $command = shift; # the first one is the actual subsection

my $action = shift; # second is action to run

if ( $command eq 'node' ) {

   require node;

   Module->import( qw/node/ );

   print &node::node( $action, @ARGV );

} elsif ( $command eq 'domain' ) {

   print &domain( $action, @ARGV );

} elsif ( $command eq 'cluster' ) {

   print &cluster( $action, @ARGV );

} else {

   &help();

}

1;