mirror of https://github.com/schoebel/mars
995 lines
31 KiB
Perl
995 lines
31 KiB
Perl
#!/usr/bin/perl -w
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# (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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use strict;
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use English;
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use warnings;
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my $Id = "267700a8a877ad79bc9b86f17891c9d7bf6fa766";
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my $mars = "/mars";
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my $host = `uname -n` or die "cannot determine my network node name\n";
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chomp $host;
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my $force = 0;
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my $ip = _get_ip() or die "cannot determine my IP address\n";
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umask 0077;
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##################################################################
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# syntactic checks
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sub check_id {
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my $str = shift;
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die "identifier '$str' has disallowed characters" unless $str =~ m/^[A-Za-z_][-A-Za-z0-9_]*$/;
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die "identifier '$str' is too long (only 16 chars allowed)" if length($str) > 16;
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}
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##################################################################
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# semantic checks
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sub check_res {
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my $res = shift;
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if(not -d "$mars/resource-$res") {
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# DO WHAT I MEAN: try to substitute a device name for a badly given resource name if it is unique
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my $count = 0;
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my $found;
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my @tests = glob("$mars/resource-*/device-$host");
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foreach my $test (@tests) {
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my $target = readlink($test);
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if($target eq $res) {
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$found = $test;
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$count++;
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}
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}
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if(!$count) {
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@tests = glob("$mars/resource-*/_direct-*-$host");
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foreach my $test (@tests) {
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my $target = readlink($test);
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$target =~ s/^.*,//;
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if($target eq $res) {
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$found = $test;
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$count++;
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}
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}
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}
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die "resource '$res' does not exist ($count replacements found)\n" unless $count == 1 and $found;
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$found =~ s:^.*/resource-(.*)/.*$:$1:;
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warn "substituting bad resource name '$res' by uniquely matching resource name '$found'\n";
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$res = $found;
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}
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return $res;
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}
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sub check_res_member {
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my $res = shift;
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die "sorry, I have not yet joined to resource '$res'\n" unless -e "$mars/resource-$res/data-$host";
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}
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sub check_sync_finished {
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my ($res, $host) = @_;
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my $lnk = "$mars/resource-$res/syncstatus-$host";
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if(lstat($lnk)) {
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my $syncstatus = readlink($lnk);
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my $size = readlink("$mars/resource-$res/size") or die "cannot read size\n";
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die "sync has not yet finished, only $syncstatus / $size bytes transferred\n" unless $syncstatus >= $size;
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}
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print "OK, it seems that sync has finished on $host.\n";
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}
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sub check_primary {
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my ($cmd, $res) = @_;
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my $pri = "$mars/resource-$res/primary";
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my $old = readlink($pri) or die "cannot determine current primary\n";
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die "for operation '$cmd' I need to be primary\n" unless $old eq $host;
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}
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sub check_not_primary {
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my ($cmd, $res) = @_;
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my $pri = "$mars/resource-$res/primary";
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my $old = readlink($pri) or die "cannot determine current primary\n";
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die "operation '$cmd' cannot be executed on primary\n" if $old eq $host;
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}
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sub check_primary_gone {
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my ($res) = @_;
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for(;;) {
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my @links = glob("$mars/resource-$res/actual-*/is-primary");
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my $found = 0;
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foreach my $link (@links) {
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my $val = readlink($link);
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$found++ if $val;
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}
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last if !$found;
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print "waiting for $found other primary host(s) to disappear....\n";
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sleep(5);
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}
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}
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sub check_todo {
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my ($res, $key, $val, $wait) = @_;
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for(;;) {
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my $path = "$mars/resource-$res/todo-$host/$key";
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my $link = readlink($path) or die "cannot read symlink '$path'\n";
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last if $link == $val;
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die "$path must have value $val\n" if $wait;
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print "waiting until $key reaches the value $val....\n";
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sleep(5);
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}
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}
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sub check_status {
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my ($res, $key, $val, $wait) = @_;
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for(;;) {
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my $path = "$mars/resource-$res/actual-$host/$key";
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my $link = readlink($path) or die "cannot read symlink '$path'\n";
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last if $link == $val;
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die "$path must have value $val\n" if $wait;
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print "waiting until $key reaches the value $val....\n";
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sleep(5);
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}
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}
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sub _check_mtime {
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my ($path, $age) = @_;
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my $mt = (lstat($path))[9];
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if(!$mt) {
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return 0;
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}
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my $res = ($mt < time() - $age);
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#print "XXX '$path' $res\n";
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return $res;
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}
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sub _check_all_mtimes {
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my ($path, $age) = @_;
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my @list = glob($path);
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my $res = 1;
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foreach my $p (@list) {
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if(!_check_mtime($p, $age)) {
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$res = 0;
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}
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}
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return $res;
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}
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sub _get_minmax {
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my ($res, $glob, $take_symlink) = @_;
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my $min = -1;
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my $max = -1;
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my @paths = glob($glob) or die "cannot find '$glob'\n";
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foreach my $path (@paths) {
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my $nr = $path;
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if($take_symlink) {
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$nr = readlink($path) or die "cannot read symlink '$path'\n";
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}
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$nr =~ s:^.*[a-z]+-([0-9]+)(-[^/]*)?$:$1:;
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$min = $nr if ($nr < $min || $min < 0);
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$max = $nr if ($nr > $max || $max < 0);
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}
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return ($min, $max);
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}
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sub get_minmax_logfiles {
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my ($res) = @_;
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return _get_minmax($res, "$mars/resource-$res/log-*", 0);
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}
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sub get_minmax_versions {
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my ($res) = @_;
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return _get_minmax($res, "$mars/resource-$res/version-*", 0);
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}
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sub get_minmax_any {
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my ($res) = @_;
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return _get_minmax($res, "$mars/resource-$res/{log,version}-*", 0);
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}
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sub get_minmax_replays {
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my ($res) = @_;
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return _get_minmax($res, "$mars/resource-$res/replay-*", 1);
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}
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sub check_splitbrain {
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# check only the chain of $host (or all hosts if unset)
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# check up to $sequence (or for all if < 0)
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my ($res, $host, $sequence) = @_;
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if($sequence < 0) {
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my $pri = "$mars/resource-$res/primary";
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my $old = readlink($pri) or die "cannot determine current primary\n";
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_primary_res($res, "(none)", $pri, $old) unless $old eq "(none)";
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_trigger();
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sleep(5);
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while(!_check_all_mtimes("$mars/resource-$res/{log,version,replay}-*", 60)) {
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print "resource directory $res not stable, waiting....\n";
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sleep(5);
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}
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while(1) {
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my ($min_log, $max_log) = get_minmax_logfiles($res);
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my ($min_ver, $max_ver) = get_minmax_versions($res);
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my ($min_rep, $max_rep) = get_minmax_replays($res);
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if($min_ver > $min_log || $max_ver < $max_log) {
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print "some version links are missing...\n";
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sleep(10);
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next;
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}
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if($max_log >= $max_rep) {
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print "resource $res: logfile $max_log is present.\n";
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last;
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}
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print "resource $res: logfile $max_log is not yet transferred (need $max_rep), waiting....\n";
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sleep(10);
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}
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} # $sequence < 0
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my $glob = "$mars/resource-$res/version-[0-9]*";
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my @links = glob($glob);
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if(!@links) {
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@links = glob("$mars/resource-$res/version-[0-9]*-*");
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die "no version information available\n" unless @links;
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print "assuming that I am primary for the first time\n";
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return;
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}
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@links = sort(@links);
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foreach my $link (@links) {
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my $nr = $link;
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$nr =~ s:^.*[a-z]+-([0-9]+)(-[^/]*)?$:$1:;
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$nr = int($nr);
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next if ($sequence >= 0 && $nr > $sequence);
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my $fromhost = $link;
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$fromhost =~ s:^.*version-[0-9]*-(.*)$:$1:;
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my $version = readlink($link) or die "cannot read symlink '$link'\n";
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my $otherhost = $version;
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$otherhost =~ s:^[^,]*,([^,]*),.*$:$1:;
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my $otherlink = sprintf("$mars/resource-$res/version-%09d-$otherhost", $nr);
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my $otherversion = readlink($otherlink) or die "cannot read symlink '$otherlink'\n";
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# ignore foreign mismatches
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if($host) {
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next if $fromhost ne $host;
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}
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# by defintion, the originator of a logfile is always "right"
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next if $otherhost eq $fromhost;
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# final check
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die "splitbrain at sequence $nr detected\n" unless $version eq $otherversion;
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}
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}
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sub get_size {
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my $arg = shift;
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return -1 unless $arg =~ m/^[0-9.]+[kmgtp]?$/i;
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my $mod = $arg;
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$arg =~ s/[^0-9]+$//;
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$mod =~ s/^[0-9]+//;
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$_ = $mod;
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SWITCH: {
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/k/i and $arg *= 1024, last SWITCH;
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/m/i and $arg *= 1024 * 1024, last SWITCH;
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/g/i and $arg *= 1024 * 1024 * 1024, last SWITCH;
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/t/i and $arg *= 1024 * 1024 * 1024 * 1024, last SWITCH;
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/p/i and $arg *= 1024 * 1024 * 1024 * 1024 * 1024, last SWITCH;
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}
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return $arg;
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}
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sub get_peers {
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my ($res) = @_;
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my @list = glob("$mars/resource-$res/connect-*");
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return map { $_ =~ s:$mars/resource-$res/connect-::; $_ } @list;
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}
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##################################################################
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# helpers
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sub _trigger {
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system("(echo 1 > /proc/sys/mars/trigger) >/dev/null 2>&1");
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}
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sub _switch {
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my ($cmd, $res, $path, $on) = @_;
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my $src = $on ? "1" : "0";
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my $old = readlink($path);
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if($old && $old eq $src) {
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print "${cmd} on resource $res is already activated\n" if $cmd;
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return;
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}
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my $tmp = $path;
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$tmp =~ s/\/([^\/]+)$/.tmp.$1/;
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symlink($src, $tmp) or die "cannot create switch symlink\n";
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rename($tmp, $path) or die "cannot rename switch symlink\n";
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print "successfully started ${cmd} on resource $res\n" if $cmd;
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}
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sub _writable {
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my ($path, $on) = @_;
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my $oldmode = (lstat $path)[2] & 0700;
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my $newmode = $on ? $oldmode | 0200 : $oldmode & ~0200;
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print "chmod '$path' $oldmode $newmode";
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chmod($newmode, $path) == 1 or die "cannot chmod '$path'\n";
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}
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sub _get_ip {
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chomp (my @info = `/sbin/ip addr show dev eth0`);
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foreach (@info) {
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m#\sinet\s(\d+\.\d+\.\d+\.\d+)# && return $1;
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}
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return undef;
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}
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sub _fake_versionlink {
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my ($basedir, $prev, $primary) = @_;
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$prev =~ s/^log-([0-9]+)-.*$/$1/;
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$prev--;
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if($prev > 0) {
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my $prevversion = sprintf("$basedir/version-%09d-$primary", $prev);
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my $prevlink = readlink($prevversion);
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if (!$prevlink) { # try any one else
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$prevversion = sprintf("$basedir/version-%09d-*", $prev);
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my @test = glob($prevversion);
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$prevlink = shift @test;
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}
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if ($prevlink) {
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print "creating faked version symlink...\n";
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my $myversion = sprintf("$basedir/version-%09d-$host", $prev);
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system("rm -f $myversion.tmp");
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symlink($prevlink, "$myversion.tmp") or die "cannot create faked version symlink '$myversion'\n";
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system("mv $myversion.tmp $myversion");
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} else {
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warn "cannot read symlink '$prevversion' -- cannot create fake\n";
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}
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}
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}
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sub _set_replaylink {
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my ($basedir, $replay, $primary) = @_;
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my $replaylink = "$basedir/replay-$host";
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my $oldreplay = readlink($replaylink);
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# fake old version symlink when necessary
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if ($oldreplay) {
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my $oldbase = $oldreplay;
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my $base = $replay;
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$oldbase =~ s/^([^,]+).*/$1/;
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$base =~ s/^([^,]+).*/$1/;
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if ($base ne $oldbase) {
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_fake_versionlink($basedir, $oldreplay, $primary);
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}
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}
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# copy pervious version symlink
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_fake_versionlink($basedir, $replay, $primary);
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# create replay symlink
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symlink($replay, "$replaylink.tmp") or die "cannot create replay status\n";
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system("mv $replaylink.tmp $replaylink");
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}
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##################################################################
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# commands
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sub ignore_cmd {
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my ($cmd, $res) = @_;
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print "ignoring command '$cmd' on resource '$res'\n";
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exit(0);
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}
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sub senseless_cmd {
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my ($cmd, $res) = @_;
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print "command '$cmd' makes no sense with MARS (ignoring)\n";
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exit(0);
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}
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sub forbidden_cmd {
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my ($cmd, $res) = @_;
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die "command '$cmd' cannot be used with MARS (it is impossible to carry out uniquely and could therefore lead to a disaster)\n";
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}
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sub nyi_cmd {
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my ($cmd, $res) = @_;
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die "command '$cmd' is not yet implemented\n";
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}
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sub is_module_loaded {
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open TEST, "lsmod | grep mars |";
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my $res = <TEST>;
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close TEST;
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return $res;
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}
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sub _create_cluster {
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my ($cmd) = @_;
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system("mkdir $mars") unless -d $mars;
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system("mkdir $mars/ips") unless -d "$mars/ips";
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system("mkdir $mars/userspace") unless -d "$mars/userspace";
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system("mkdir $mars/defaults") unless -d "$mars/defaults";
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system("mkdir $mars/defaults-$host") unless -d "$mars/defaults-$host";
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system("mkdir $mars/todo-global") unless -d "$mars/todo-global";
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symlink($ip, "$mars/ips/ip-$host");
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symlink("1", "$mars/todo-global/deleted-$host");
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}
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sub create_cluster {
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my ($cmd, $peer) = @_;
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die "cluster is already created\n" if !$force && -d "$mars/ips";
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die "mars module is loaded, please unload first\n" if is_module_loaded();
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_create_cluster(@_);
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}
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sub join_cluster {
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my ($cmd, $peer) = @_;
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if(glob("$mars/resource-*") or glob("$mars/ips/*")) {
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die "Sorry, some resources already exist!\nThis is dangerous!\nIf you are sure that no resource clash is possible, re-invoke this command with '--force' option\n" unless $force;
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}
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die "mars module is loaded, please unload first\n" if is_module_loaded();
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print "joining cluster via rsync (peer='$peer')\n";
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# check connection
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system("ssh $peer uname -a") == 0 or die "oops, no connection to $peer ...\n";
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_create_cluster(@_);
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system("rsync --recursive --links -v $peer:$mars/ips/ $mars/ips/") == 0 or die "oops\n";
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symlink($ip, "$mars/ips/ip-$host");
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system("rsync --recursive --links -v $mars/ips/ $peer:$mars/ips/") == 0 or die "oops\n";
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}
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sub leave_cluster {
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my ($cmd) = @_;
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my $check = "/mars/resource-*/*-$host";
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die "I am member of some resources\n" if glob($check) && !$force;
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_create_delete("$mars/ips/$host");
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}
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sub create_res {
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my ($cmd, $res, $dev, $appear) = @_;
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my $create = ($cmd eq "create-resource");
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die "undefined device or size argument\n" unless $dev;
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$appear = $res if !$appear;
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check_id($appear) if $appear;
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if($create) {
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die "resource '$res' already exists\n" if -d "$mars/resource-$res";
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print "creating new resource '$res'\n";
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} else {
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die "resource '$res' has been already joined -- this is dangerous!\n" if -e "$mars/resource-$res/connect-$host";
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print "joining to existing resource '$res'\n";
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}
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my $size = get_size($dev);
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if($size > 0) {
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$dev = "";
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} else {
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die "block device '$dev' does not exist\n" unless -b $dev;
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die "block device '$dev' must be an absolute path starting with '/'\n" unless $dev =~ m/^\//;
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use Fcntl 'SEEK_END';
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open(TEST, "<$dev") or die "cannot open device for reading\n";
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$size = sysseek(TEST, 0, SEEK_END);
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close(TEST);
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print "device size = $size bytes\n";
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die "implausible size $size" unless $size > 0;
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}
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my $tmp = "$mars/.tmp.$res";
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my $primary;
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my $replay;
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if($create) {
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_create_cluster(@_);
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system("rm -rf $tmp");
|
|
system("mkdir $tmp") == 0 or die "could not create resource '$res'\n";
|
|
symlink($size, "$tmp/size") or die "cannot create size indicator symlink\n";
|
|
} else {
|
|
$tmp = "$mars/resource-$res";
|
|
die "resource '$res' does not exist\n" unless -d $tmp;
|
|
$primary = readlink("$tmp/primary") or die "cannot determine primary\n";
|
|
if($primary eq "(none)") {
|
|
my @list = glob("$tmp/replay-*") or die "cannot find any candidate for primary\n";
|
|
my $first = pop @list or die "bad glob list\n";
|
|
$primary = readlink($first) or die "cannot determine peer\n";
|
|
$primary =~ s/^log-[0-9]+-(.*),.*,.*$/$1/;
|
|
print "using '$primary' as primary\n";
|
|
}
|
|
die "resource '$res' is already joined\n" if -e "$tmp/data-$host";
|
|
die "my ip '$ip' is not registered -- please run 'join-cluster' first\n" unless -l "$mars/ips/ip-$host";
|
|
my $oldsize = readlink("$tmp/size") or die "cannot determine old size\n";
|
|
if($size < $oldsize) {
|
|
print "adjusting size to $oldsize\n";
|
|
$size = $oldsize;
|
|
}
|
|
die "sizes differ: real size = $oldsize, but requested size = $size\n" unless $oldsize == $size;
|
|
$replay = readlink("$tmp/replay-$primary") or die "cannot read replay status of primary '$primary'\n";
|
|
$replay =~ s/,[0-9]+,[0-9]+$/,0,0/;
|
|
}
|
|
|
|
my $file = "$tmp/data-$host";
|
|
if(!$dev) {
|
|
print "creating sparse file '$file' with size $size\n";
|
|
open(OUT, ">$file") or die "could not open '$file'\n";
|
|
use Fcntl 'SEEK_SET';
|
|
sysseek(OUT, $size-1, SEEK_SET) == $size-1 or die "could not seek\n";
|
|
syswrite(OUT, '\0', 1) == 1 or die "cannot init sparse file\n";
|
|
close OUT;
|
|
} else {
|
|
print "using existing device '$dev'\n";
|
|
symlink($dev, $file) or die "cannot create device symlink\n";
|
|
}
|
|
if($appear) {
|
|
# TODO: check for uniqeness of $appear
|
|
print "resource '$res' will appear as local device '/dev/mars/$appear'\n";
|
|
system("rm -f $tmp/device-$host");
|
|
symlink($appear, "$tmp/device-$host") or die "cannot create symlink for local device appearance\n";
|
|
}
|
|
|
|
mkdir("$tmp/userspace") unless -d "$tmp/userspace";
|
|
mkdir("$tmp/defaults") unless -d "$tmp/defaults";
|
|
mkdir("$tmp/defaults-$host");
|
|
mkdir("$tmp/actual-$host");
|
|
my $todo = "$tmp/todo-$host";
|
|
mkdir($todo);
|
|
symlink("1", "$todo/attach");
|
|
symlink("1", "$todo/connect");
|
|
symlink("1", "$todo/sync");
|
|
symlink("1", "$todo/allow-replay");
|
|
system("rm -f $tmp/syncstatus-$host");
|
|
|
|
if($create) {
|
|
symlink($host, "$tmp/primary") or die "cannot create primary symlink\n";
|
|
symlink($size, "$tmp/syncstatus-$host") or die "cannot create primary syncstatus\n";
|
|
symlink("log-000000001-$host,0,0", "$tmp/replay-$host") or die "cannot create replay status\n";
|
|
system("touch $tmp/log-000000001-$host");
|
|
rename($tmp, "$mars/resource-$res") or die "cannot finalize resource '$res'\n";
|
|
print "successfully created resource '$res'\n";
|
|
} else {
|
|
_set_replaylink($tmp, $replay, $primary);
|
|
symlink("0", "$tmp/syncstatus-$host") or die "cannot start initial sync\n";
|
|
system("rm -f $tmp/connect-$host");
|
|
symlink($primary, "$tmp/connect-$host") or die "cannot create peer connect symlink\n";
|
|
symlink($host, "$tmp/connect-$primary") unless -l "$tmp/connect-$primary";
|
|
print "successfully joined resource '$res'\n";
|
|
}
|
|
}
|
|
|
|
sub leave_res {
|
|
my ($cmd, $res) = @_;
|
|
check_not_primary(@_);
|
|
foreach my $tmp (glob("$mars/resource-$res/todo-$host/*")) {
|
|
my $status = readlink($tmp);
|
|
die "cannot read symlink '$tmp'\n" unless defined($status);
|
|
die "switch '$tmp' is not off\n" if $status;
|
|
}
|
|
foreach my $tmp (glob("$mars/resource-$res/actual-$host/*")) {
|
|
my $status = readlink($tmp);
|
|
die "cannot read symlink '$tmp'\n" unless defined($status);
|
|
die "running status '$tmp' is not off\n" if $status;
|
|
}
|
|
my $peerlink = "$mars/resource-$res/connect-$host";
|
|
my $peer = readlink($peerlink) or die "cannot read symlink '$peerlink'\n";
|
|
foreach my $tmp (glob("$mars/resource-$res/connect-*")) {
|
|
next if $tmp eq $peerlink;
|
|
my $target = readlink($tmp) or die "cannot read symlink '$tmp'\n";
|
|
next unless $target eq $host;
|
|
print "changing '$tmp' from '$host' to '$peer'\n";
|
|
unlink("$tmp.new");
|
|
symlink($peer, "$tmp.new") or die "cannot create symlink '$tmp.new'\n";
|
|
rename("$tmp.new", $tmp) or die "cannot create symlink '$tmp'\n";
|
|
}
|
|
unlink($peerlink);
|
|
}
|
|
|
|
sub logrotate_res {
|
|
my ($cmd, $res) = @_;
|
|
check_primary(@_);
|
|
my @paths = glob("$mars/resource-$res/log-*-$host") or die "cannot find any logfiles\n";
|
|
@paths = sort(@paths);
|
|
my $last = pop(@paths);
|
|
if(-z $last) {
|
|
print "an empty logfile '$last' already exists, nothing to do.\n";
|
|
return;
|
|
}
|
|
my $nr = $last;
|
|
$nr =~ s/^.*log-([0-9]+)-.+$/$1/;
|
|
my $next = sprintf("$mars/resource-$res/log-%09d-$host", $nr + 1);
|
|
die "logfile '$next' already exists\n" if -e $next;
|
|
system("touch $next");
|
|
}
|
|
|
|
sub _allowed_logdelete {
|
|
my ($cmd, $res) = @_;
|
|
my $min = -1;
|
|
my @paths = glob("$mars/resource-$res/replay-*") or die "cannot find any replay symlinks\n";
|
|
foreach my $path (@paths) {
|
|
my $target = readlink($path) or die "cannot read symlink '$path'\n";
|
|
my $nr = $target;
|
|
$nr =~ s/^log-([0-9]+)-.*$/$1/;
|
|
$min = $nr if ($nr < $min || $min < 0);
|
|
}
|
|
print "max allowed deletable logfile number: $min\n";
|
|
return $min;
|
|
}
|
|
|
|
sub _create_delete {
|
|
my ($target) = @_;
|
|
my $nr = 0;
|
|
my @paths = glob("$mars/todo-global/delete-*");
|
|
if(@paths) {
|
|
my $last = pop(@paths);
|
|
$nr = $last;
|
|
$nr =~ s/^.*delete-([0-9]+)$/$1/;
|
|
}
|
|
my $new = sprintf("$mars/todo-global/delete-%09d", $nr + 1);
|
|
print "create symlink $new -> $target\n";
|
|
symlink($target, $new);
|
|
}
|
|
|
|
sub logdelete_res {
|
|
my ($cmd, $res) = @_;
|
|
my @paths = glob("$mars/resource-$res/log-*") or die "cannot find any logfiles\n";
|
|
@paths = sort(@paths);
|
|
my $max = _allowed_logdelete(@_);
|
|
|
|
my $nr = 0;
|
|
for (;;) {
|
|
my $first = shift(@paths);
|
|
last unless $first;
|
|
$nr = $first;
|
|
$nr =~ s/^.*log-([0-9]+)-.+$/$1/;
|
|
last unless $nr < $max;
|
|
|
|
print "chosen '$first' for deletion\n";
|
|
|
|
_create_delete($first);
|
|
}
|
|
print "removing left-over version symlinks...\n";
|
|
foreach my $versionlink (glob("$mars/resource-$res/version-*")) {
|
|
my $nrv = $versionlink;
|
|
$nrv =~ s/^.*\/version-([0-9]+)-.+$/$1/;
|
|
next unless $nrv < $nr - 1;
|
|
_create_delete($versionlink);
|
|
}
|
|
}
|
|
|
|
sub attach_res {
|
|
my ($cmd, $res) = @_;
|
|
my $detach = ($cmd eq "detach");
|
|
my $path = "$mars/resource-$res/todo-$host/attach";
|
|
_switch($cmd, $res, $path, !$detach);
|
|
}
|
|
|
|
sub connect_res {
|
|
my ($cmd, $res) = @_;
|
|
my $disconnect = ($cmd eq "disconnect");
|
|
my @paths = glob("$mars/resource-$res/todo-*/");
|
|
for my $path (@paths) {
|
|
_switch($cmd, $res, "$path/connect", !$disconnect);
|
|
}
|
|
}
|
|
|
|
sub connect_local_res {
|
|
my ($cmd, $res) = @_;
|
|
my $disconnect = ($cmd eq "disconnect-local");
|
|
my $path = "$mars/resource-$res/todo-$host/connect";
|
|
_switch($cmd, $res, $path, !$disconnect);
|
|
}
|
|
|
|
sub pause_sync_res {
|
|
my ($cmd, $res) = @_;
|
|
my $pause = ($cmd eq "pause-sync");
|
|
my @paths = glob("$mars/resource-$res/todo-*/");
|
|
for my $path (@paths) {
|
|
_switch($cmd, $res, "$path/sync", !$pause);
|
|
}
|
|
}
|
|
|
|
sub pause_sync_local_res {
|
|
my ($cmd, $res) = @_;
|
|
my $pause = ($cmd eq "pause-sync-local");
|
|
my $path = "$mars/resource-$res/todo-$host/sync";
|
|
_switch($cmd, $res, $path, !$pause);
|
|
}
|
|
|
|
sub pause_replay_res {
|
|
my ($cmd, $res) = @_;
|
|
my $pause = ($cmd eq "pause-replay");
|
|
my @paths = glob("$mars/resource-$res/todo-*/");
|
|
for my $path (@paths) {
|
|
_switch($cmd, $res, "$path/allow-replay", !$pause);
|
|
}
|
|
}
|
|
|
|
sub pause_replay_local_res {
|
|
my ($cmd, $res) = @_;
|
|
my $pause = ($cmd eq "pause-replay-local");
|
|
my $path = "$mars/resource-$res/todo-$host/allow-replay";
|
|
_switch($cmd, $res, $path, !$pause);
|
|
}
|
|
|
|
sub up_res {
|
|
my ($cmd, $res) = @_;
|
|
my $down = ($cmd eq "down");
|
|
if($down) {
|
|
pause_replay_res("pause-replay", $res);
|
|
pause_sync_res("pause-sync", $res);
|
|
connect_res("disconnect", $res);
|
|
attach_res("detach", $res);
|
|
} else {
|
|
attach_res("attach", $res);
|
|
connect_res("connect", $res);
|
|
pause_sync_res("resume-sync", $res);
|
|
pause_replay_res("resume-replay", $res);
|
|
}
|
|
}
|
|
|
|
sub fake_local_res {
|
|
my ($cmd, $res) = @_;
|
|
my $path = "$mars/resource-$res/todo-$host/sync";
|
|
_switch($cmd, $res, $path, 0);
|
|
#check_status($res, "copy-syncstatus-$host", 0);
|
|
my $size = readlink("$mars/resource-$res/size") or die "cannot read size\n";
|
|
my $target = "$mars/resource-$res/syncstatus-$host";
|
|
symlink($size, "$target.tmp") or die "cannot create faked syncstatus\n";
|
|
rename("$target.tmp", $target) or die "cannot reaname symlink\n";
|
|
}
|
|
|
|
sub _primary_res {
|
|
my ($res, $host, $pri, $old) = @_;
|
|
my $tmp = "$mars/resource-$res/.tmp.primary";
|
|
system("rm -f $tmp");
|
|
symlink($host, $tmp) or die "cannot create new primary symlink\n";
|
|
rename($tmp, $pri) or die "cannot install new primary symlink\n";
|
|
print "primary changed from '$old' to '$host'\n";
|
|
}
|
|
|
|
sub primary_res {
|
|
my ($cmd, $res) = @_;
|
|
my $sec = ($cmd eq "secondary");
|
|
my $pri = "$mars/resource-$res/primary";
|
|
my $old = readlink($pri) or die "cannot determine current primary\n";
|
|
if($sec) {
|
|
die "for safety reasons, switching to secondary is only allowed when I ($host) am primary\n" if($old ne $host);
|
|
$host = "(none)";
|
|
} elsif($old eq $host) {
|
|
print "I am already primary.\n";
|
|
exit(0);
|
|
} elsif($force) {
|
|
print "FORCING myself ($host) to primary...\n";
|
|
} else { # try to switch myself to primary
|
|
print "trying to switch $host to primary...\n";
|
|
check_sync_finished($res, $host);
|
|
check_todo($res, "connect", 1, 1);
|
|
_primary_res($res, "(none)", $pri, $old) unless $old eq "(none)";
|
|
check_primary_gone($res);
|
|
check_splitbrain($res, $host, -1);
|
|
}
|
|
_primary_res($res, $host, $pri, $old);
|
|
}
|
|
|
|
sub invalidate_res {
|
|
my ($cmd, $res) = @_;
|
|
check_not_primary(@_);
|
|
my $old_replay = readlink("$mars/resource-$res/replay-$host") or die "cannot read my own replay status symlink\n";
|
|
$old_replay =~ s/^([^,]+),.*/$1/;
|
|
my $repl = "$mars/resource-$res/todo-$host/allow-replay";
|
|
my $was_on = readlink($repl);
|
|
if ($was_on) {
|
|
_switch("pause-replay-local", $res, $repl, 0);
|
|
_trigger();
|
|
print "waiting...\n";
|
|
sleep(15);
|
|
}
|
|
my $dst = "$mars/resource-$res/syncstatus-$host";
|
|
system("rm -f $dst");
|
|
symlink("0", $dst) or die "cannot create invalidation symlink '$dst'\n";
|
|
my $primary = readlink("$mars/resource-$res/primary") or die "cannot determine primary\n";
|
|
my $replay = readlink("$mars/resource-$res/replay-$primary") or die "cannot read replay status of primary '$primary'\n";
|
|
$replay =~ s/,[0-9]+,[0-9]+$/,0,0/;
|
|
_set_replaylink("$mars/resource-$res", $replay, $primary);
|
|
if ($was_on) {
|
|
_trigger();
|
|
print "waiting...\n";
|
|
sleep(15);
|
|
_switch("resume-replay-local", $res, $repl, 1);
|
|
}
|
|
}
|
|
|
|
sub resize_res {
|
|
my ($cmd, $res) = @_;
|
|
check_primary(@_);
|
|
my @actsizes = glob("$mars/resource-$res/actsize-*");
|
|
die "resource $res has no actsize-* symlinks\n" unless @actsizes;
|
|
my $lnk = "$mars/resource-$res/size";
|
|
my $old_size = readlink($lnk) or die "cannot read symlink '$lnk'\n";
|
|
my $min_size = 0;
|
|
foreach my $actsize (@actsizes) {
|
|
my $this_size = readlink($actsize) or die "cannot read symlink '$actsize'\n";
|
|
if (!$min_size || $this_size < $min_size) {
|
|
$min_size = $this_size;
|
|
}
|
|
}
|
|
print "old_size=$old_size\n";
|
|
print "new_size=$min_size\n";
|
|
die "only increases of the size are possible\n" if $min_size <= $old_size && !$force;
|
|
foreach my $switch (glob("$mars/resource-$res/todo-*/sync")) {
|
|
my $this_switch = readlink($switch);
|
|
die "cannot read symlink '$switch'\n" unless defined($this_switch);
|
|
die "sync on '$switch' is switched on -- use marsadm pause-sync to stop\n" unless !$this_switch;
|
|
}
|
|
my @syncsizes = glob("$mars/resource-$res/syncstatus-$host");
|
|
foreach my $syncsize (@syncsizes) {
|
|
my $this_size = readlink($syncsize) or die "cannot read symlink '$syncsize'\n";
|
|
die "sync on $syncsize has not yet finished: $this_size != $old_size (DANGEROUS FIX: if you know what you are doing, marsadm fake-sync can 'fix' it -- but this may need a full-sync afterwards)\n" unless $this_size == $old_size;
|
|
}
|
|
foreach my $syncsize (@syncsizes) {
|
|
my $this_size = readlink($syncsize) or die "cannot read symlink '$syncsize'\n";
|
|
unlink("$syncsize.new");
|
|
symlink($min_size, "$syncsize.new") or die "cannot create size symlink '$syncsize.new'\n";
|
|
rename("$syncsize.new", $syncsize) or die "cannot create size symlink '$syncsize'\n";;
|
|
}
|
|
unlink("$lnk.new");
|
|
symlink($min_size, "$lnk.new") or die "cannot create size symlink '$lnk.new'\n";
|
|
rename("$lnk.new", $lnk) or die "cannot create size symlink '$lnk'\n";;
|
|
}
|
|
|
|
sub role_cmd {
|
|
my ($cmd, $res) = @_;
|
|
my $pri = "$mars/resource-$res/primary";
|
|
my $old = readlink($pri) or die "cannot determine current primary\n";
|
|
if($old eq $host) {
|
|
print "primary\n";
|
|
} else {
|
|
print "secondary\n";
|
|
}
|
|
}
|
|
|
|
sub helplist {
|
|
my $temp;
|
|
$temp = shift;
|
|
print "ERROR: $temp" if ($temp);
|
|
print "
|
|
marsadm <command> [<resource>] [<option>]
|
|
|
|
<command> =
|
|
cluster : create-cluster join-cluster leave-cluster
|
|
resource : create-resource join-resource leave-resource
|
|
primary secondary invalidate
|
|
up down
|
|
replication: connect disconnect connect-local disconnect-local
|
|
replay : pause-replay resume-replay pause-replay-local resume-replay-local
|
|
sync : pause-sync resume-sync pause-sync-local resume-sync-local fake-sync
|
|
logfile : log-rotate log-delete log-delete-all
|
|
device : attach detach
|
|
internal : help version
|
|
|
|
<resource> = name of resource or \"all\" for all resources
|
|
|
|
<option> = special by command
|
|
|
|
Advanced information are also available here: http://http://wiki.intranet.1and1.com/bin/view/PO/ProjektTEC1603
|
|
\n";
|
|
exit 0;
|
|
}
|
|
|
|
sub version {
|
|
print "$0 $Id\n";
|
|
#print "my IP is $ip\n";
|
|
exit 0;
|
|
}
|
|
|
|
##################################################################
|
|
my %cmd_table =
|
|
(
|
|
# new keywords
|
|
"create-cluster" => \&create_cluster,
|
|
"join-cluster" => \&join_cluster,
|
|
"leave-cluster" => \&leave_cluster,
|
|
"create-resource" => \&create_res,
|
|
"join-resource" => \&create_res,
|
|
"leave-resource" => \&leave_res,
|
|
"log-rotate" => \&logrotate_res,
|
|
"log-delete" => \&logdelete_res,
|
|
"log-delete-all" => \&logdelete_res,
|
|
"fake-sync" => \&fake_local_res,
|
|
|
|
# compatible keywords
|
|
"attach" => \&attach_res,
|
|
"detach" => \&attach_res,
|
|
"connect" => \&connect_res,
|
|
"disconnect" => \&connect_res,
|
|
"connect-local" => \&connect_local_res,
|
|
"disconnect-local" => \&connect_local_res,
|
|
"syncer" => \&ignore_cmd,
|
|
"up" => \&up_res,
|
|
"down" => \&up_res,
|
|
"primary" => \&primary_res,
|
|
"secondary" => \&primary_res,
|
|
"invalidate" => \&invalidate_res,
|
|
"invalidate-remote" => \&forbidden_cmd,
|
|
"resize" => \&resize_res,
|
|
"create-md" => \&senseless_cmd,
|
|
"get-gi" => \&ignore_cmd,
|
|
"show-gi" => \&ignore_cmd,
|
|
"dump-md" => \&senseless_cmd,
|
|
"outdate" => \&ignore_cmd,
|
|
"adjust" => \&ignore_cmd,
|
|
"wait-connect" => \&nyi_cmd,
|
|
"role" => \&role_cmd,
|
|
"state" => \&role_cmd,
|
|
"cstate" => \&nyi_cmd,
|
|
"status" => \&nyi_cmd,
|
|
"dump" => \&senseless_cmd,
|
|
"verify" => \&nyi_cmd,
|
|
"pause-sync" => \&pause_sync_res,
|
|
"resume-sync" => \&pause_sync_res,
|
|
"pause-sync-local" => \&pause_sync_local_res,
|
|
"resume-sync-local" => \&pause_sync_local_res,
|
|
"pause-replay" => \&pause_replay_res,
|
|
"resume-replay" => \&pause_replay_res,
|
|
"pause-replay-local" => \&pause_replay_local_res,
|
|
"resume-replay-local" => \&pause_replay_local_res,
|
|
"new-current-uuid" => \&senseless_cmd,
|
|
"dstate" => \&nyi_cmd,
|
|
"hidden-commands" => \&ignore_cmd,
|
|
);
|
|
|
|
my @args;
|
|
|
|
foreach my $arg (@ARGV) {
|
|
if($arg eq "--force") {
|
|
$force++;
|
|
next;
|
|
}
|
|
if($arg =~ s/^force-//) {
|
|
$force++;
|
|
}
|
|
push @args, $arg;
|
|
}
|
|
|
|
my $cmd = shift @args || helplist "command argument is missing\n";
|
|
|
|
if($cmd =~ m/^help$/ || $cmd =~ m/^h$/) {
|
|
helplist;
|
|
}
|
|
|
|
if($cmd =~ m/^version$/ || $cmd =~ m/^v$/) {
|
|
version;
|
|
}
|
|
|
|
die "only root may use this tool\n" if $< != 0; # getpid() seems to be missing in perlfunc
|
|
helplist "unknown command $cmd\n" if !exists $cmd_table{$cmd};
|
|
|
|
my $res = "";
|
|
unless($cmd =~ m/^(create|leave)-cluster$/) {
|
|
$res = shift @args || helplist "resource argument is missing\n";
|
|
check_id($res);
|
|
}
|
|
|
|
|
|
print "using FORCE option -- hopefully you know what you do!\n" if $force;
|
|
|
|
sub do_res {
|
|
my $cmd = shift;
|
|
my $res = shift;
|
|
|
|
$res = check_res($res) unless $cmd =~ m/^(join|create|leave)-cluster|create-resource$/;
|
|
check_res_member($res) unless $cmd =~ m/^(join|create)-(cluster|resource)|leave-cluster$/;
|
|
|
|
my $func = $cmd_table{$cmd};
|
|
&{$func}($cmd, $res, @_);
|
|
}
|
|
|
|
if($res eq "all") {
|
|
foreach $res (glob("$mars/resource-*")) {
|
|
next unless -e "$res/data-$host";
|
|
$res =~ s/^.*\/resource-(.*)$/$1/;
|
|
print "--------- resource $res\n";
|
|
do_res($cmd, $res, @args);
|
|
}
|
|
} else {
|
|
do_res($cmd, $res, @args);
|
|
}
|
|
|
|
_trigger();
|