[pve-ha-manager.git] / PVE / HA / Manager.pm

package PVE::HA::Manager;

use strict;
use warnings;
use Digest::MD5 qw(md5_base64);

use Data::Dumper;

use PVE::HA::NodeStatus;

sub new {
    my ($this, $haenv) = @_;

    my $class = ref($this) || $this;

    my $ms = $haenv->read_manager_status();

    $ms->{master_node} = $haenv->nodename();

    my $ns = PVE::HA::NodeStatus->new($haenv, $ms->{node_status} || {});

    # fixme: use separate class  PVE::HA::ServiceStatus
    my $ss = $ms->{service_status} || {};

    my $self = bless {
	haenv => $haenv,
	ms => $ms, # master status
	ns => $ns, # PVE::HA::NodeStatus
	ss => $ss, # service status
    }, $class;

    return $self;
}

sub cleanup {
    my ($self) = @_;

    # todo: ?
}

sub flush_master_status {
    my ($self) = @_;

    my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});

    $ms->{node_status} = $ns->{status};
    $ms->{service_status} = $ss;

    $haenv->write_manager_status($ms);
} 

# Attention: must be idempotent (alway return the same result for same input!)
sub select_service_node {
    my ($self, $service_conf) = @_;

    my $ns = $self->{ns};
    
    my $pref_node = $service_conf->{node};

    return $pref_node if $ns->node_is_online($pref_node);

    my $online_nodes = $ns->list_online_nodes();

    return shift @$online_nodes;
}

my $uid_counter = 0;

my $valid_service_states = {
    stopped => 1,
    request_stop => 1,
    started => 1,
    fence => 1,
    move => 1,
    migrate => 1,
    error => 1,
};

my $change_service_state = sub {
    my ($self, $sid, $new_state, %params) = @_;

    my ($haenv, $ss) = ($self->{haenv}, $self->{ss});

    my $sd = $ss->{$sid} || die "no such service '$sid";

    my $old_state = $sd->{state};

    die "no state change" if $old_state eq $new_state; # just to be sure

    die "invalid CRM service state '$new_state'\n" if !$valid_service_states->{$new_state};

    my $changes = '';
    foreach my $k (keys %params) {
	my $v = $params{$k};
	next if defined($sd->{$k}) && $sd->{$k} eq $v;
	$changes .= ", " if $changes;
	$changes .= "$k = $v";
	$sd->{$k} = $v;
    }
    
    $sd->{state} = $new_state;
    $uid_counter++;
    $sd->{uid} = md5_base64($new_state . $$ . time() . $uid_counter);

    # fixme: cleanup state (remove unused values)

    $changes = " ($changes)" if $changes;
    $haenv->log('info', "service '$sid': state changed to '$new_state' $changes\n");
};

# read LRM status for all active nodes 
sub read_lrm_status {
    my ($self) = @_;

    my $nodes = $self->{ns}->list_online_nodes();
    my $haenv = $self->{haenv};

    my $res = {};

    foreach my $node (@$nodes) {
	my $ls = $haenv->read_lrm_status($node);
	foreach my $uid (keys %$ls) {
	    next if $res->{$uid}; # should not happen
	    $res->{$uid} = $ls->{$uid};
	}
    }

    return $res;
}

# read new crm commands and save them into crm master status
sub update_crm_commands {
    my ($self) = @_;

    my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});

    my $cmdlist = $haenv->read_crm_commands();
    
    foreach my $cmd (split(/\n/, $cmdlist)) {
	chomp $cmd;

	if ($cmd =~ m/^migrate\s+(\S+)\s+(\S+)$/) {
	    my ($sid, $node) = ($1, $2); 
	    if (my $sd = $ss->{$sid}) {
		if (!$ns->node_is_online($node)) {
		    $haenv->log('err', "crm command error - node not online: $cmd");
		} else {
		    if ($node eq $sd->{node}) {
			$haenv->log('info', "ignore crm command - service already on target node: $cmd");
		    } else { 
			$haenv->log('info', "got crm command: $cmd");
			$ss->{$sid}->{cmd} = [ 'migrate', $node];
		    }
		}
	    } else {
		$haenv->log('err', "crm command error - no such service: $cmd");
	    }

	} else {
	    $haenv->log('err', "unable to parse crm command: $cmd");
	}
    }

}

sub manage {
    my ($self) = @_;

    my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});

    $ns->update($haenv->get_node_info());

    if (!$ns->node_is_online($haenv->nodename())) {
	$haenv->log('info', "master seems offline\n");
	return;
    }

    my $lrm_status = $self->read_lrm_status();

    my $sc = $haenv->read_service_config();

    # compute new service status

    # add new service
    foreach my $sid (keys %$sc) {
	next if $ss->{$sid}; # already there
	$haenv->log('info', "Adding new service '$sid'\n");
	# assume we are running to avoid relocate running service at add
	$ss->{$sid} = { state => 'started', node => $sc->{$sid}->{node}};
    }

    $self->update_crm_commands();

    for (;;) {
	my $repeat = 0;

	foreach my $sid (keys %$ss) {
	    my $sd = $ss->{$sid};
	    my $cd = $sc->{$sid} || { state => 'disabled' };

	    my $lrm_res = $sd->{uid} ? $lrm_status->{$sd->{uid}} : undef;

	    my $last_state = $sd->{state};

	    if ($last_state eq 'stopped') {

		$self->next_state_stopped($sid, $cd, $sd);

	    } elsif ($last_state eq 'started') {

		$self->next_state_started($sid, $cd, $sd);

	    } elsif ($last_state eq 'migrate') {

		# check result from LRM daemon
		if ($lrm_res) {
		    my $exit_code = $lrm_res->{exit_code};
		    if ($exit_code == 0) {
			&$change_service_state($self, $sid, 'started', node => $sd->{target});
		    } else {
			$haenv->log('err', "service '$sid' - migration failed (exit code $exit_code)");
			&$change_service_state($self, $sid, 'started', node => $sd->{node});
		    }
		}

	    } elsif ($last_state eq 'move') {

		#die "implement me";

	    } elsif ($last_state eq 'fence') {

		# do nothing here - wait until fenced

	    } elsif ($last_state eq 'request_stop') {

		# check result from LRM daemon
		if ($lrm_res) {
		    my $exit_code = $lrm_res->{exit_code};
		    if ($exit_code == 0) {
			&$change_service_state($self, $sid, 'stopped');
		    } else {
			&$change_service_state($self, $sid, 'error'); # fixme: what state?
		    }
		}

	    } elsif ($last_state eq 'error') {

		# fixme: 

	    } else {

		die "unknown service state '$last_state'";
	    }

	    $repeat = 1 if $sd->{state} ne $last_state;
	}

	# handle fencing
	my $fenced_nodes = {};
	foreach my $sid (keys %$ss) {
	    my $sd = $ss->{$sid};
	    next if $sd->{state} ne 'fence';

	    if (!defined($fenced_nodes->{$sd->{node}})) {
		$fenced_nodes->{$sd->{node}} = $ns->fence_node($sd->{node}) || 0;
	    }

	    next if !$fenced_nodes->{$sd->{node}};

	    # node fence was sucessful - mark service as stopped
	    &$change_service_state($self, $sid, 'stopped');	    
	}

	last if !$repeat;
    }

    # remove stale services
    # fixme:

    $self->flush_master_status();
}

# functions to compute next service states
# $cd: service configuration data (read only)
# $sd: service status data (read only)
#
# Note: use change_service_state() to alter state
#

sub next_state_stopped {
    my ($self, $sid, $cd, $sd) = @_;

    my $haenv = $self->{haenv};
    my $ns = $self->{ns};

    if ($sd->{node} ne $cd->{node}) {
	# this can happen if we fence a node with active migrations
	# hack: modify $sd (normally this should be considered read-only)
	$haenv->log('info', "fixup service '$sid' location ($sd->{node} => $cd->{node}");
	$sd->{node} = $cd->{node}; 
    }

    if ($sd->{cmd}) {
	my ($cmd, $target) = @{$sd->{cmd}};
	delete $sd->{cmd};

	if ($cmd eq 'migrate') {
	    if (!$ns->node_is_online($target)) {
		$haenv->log('err', "ignore service '$sid' migrate request - node '$target' not online");
	    } elsif ($sd->{node} eq $target) {
		$haenv->log('info', "ignore service '$sid' migrate request - service already on node '$target'");
	    } else {
		$haenv->change_service_location($sid, $target);
		$cd->{node} = $sd->{node} = $target; # fixme: $sd is read-only??!!	    
		$haenv->log('info', "migrate service '$sid' to node '$target' (stopped)");
	    }
	} else {
	    $haenv->log('err', "unknown command '$cmd' for service '$sid'"); 
	}
    } 

    if ($cd->{state} eq 'disabled') {
	# do nothing
	return;
    } 

    if ($cd->{state} eq 'enabled') {
	if (my $node = $self->select_service_node($cd)) {
	    if ($node && ($sd->{node} ne $node)) {
		$haenv->change_service_location($sid, $node);
	    }
	    &$change_service_state($self, $sid, 'started', node => $node);
	} else {
	    # fixme: warn 
	}

	return;
    }

    $haenv->log('err', "service '$sid' - unknown state '$cd->{state}' in service configuration");
}

sub next_state_started {
    my ($self, $sid, $cd, $sd) = @_;

    my $haenv = $self->{haenv};
    my $ns = $self->{ns};

    if (!$ns->node_is_online($sd->{node})) {

	&$change_service_state($self, $sid, 'fence');
	return;
    }
	
    if ($cd->{state} eq 'disabled') {
	&$change_service_state($self, $sid, 'request_stop');
	return;
    }

    if ($cd->{state} eq 'enabled') {
	my $node = $self->select_service_node($cd);

	if ($sd->{cmd}) {
	    my ($cmd, $target) = @{$sd->{cmd}};
	    delete $sd->{cmd};

	    if ($cmd eq 'migrate') {
		if (!$ns->node_is_online($target)) {
		    $haenv->log('err', "ignore service '$sid' migrate request - node '$target' not online");
		} elsif ($sd->{node} eq $target) {
		    $haenv->log('info', "ignore service '$sid' migrate request - service already on node '$target'");
		} else {
		    $node = $target;
		}
	    } else {
		$haenv->log('err', "unknown command '$cmd' for service '$sid'"); 
	    }
	}

	if ($node && ($sd->{node} ne $node)) {
	    $haenv->log('info', "migrate service '$sid' to node '$node' (running)");
	    &$change_service_state($self, $sid, 'migrate', node => $sd->{node}, target => $node);
	} else {
	    # do nothing
	}

	return;
    } 

    $haenv->log('err', "service '$sid' - unknown state '$cd->{state}' in service configuration");
}

1;
Commit	Line	Data
c0bbd038 DM	1	package PVE::HA::Manager;
	2
	3	use strict;
	4	use warnings;
c4a221bc	5	use Digest::MD5 qw(md5_base64);
c0bbd038 DM	6
	7	use Data::Dumper;
	8
	9	use PVE::HA::NodeStatus;
	10
	11	sub new {
8f0bb968	12	my ($this, $haenv) = @_;
c0bbd038 DM	13
	14	my $class = ref($this) \|\| $this;
	15
8f0bb968 DM	16	my $ms = $haenv->read_manager_status();
	17
	18	$ms->{master_node} = $haenv->nodename();
	19
	20	my $ns = PVE::HA::NodeStatus->new($haenv, $ms->{node_status} \|\| {});
	21
59fd7207 DM	22	# fixme: use separate class PVE::HA::ServiceStatus
	23	my $ss = $ms->{service_status} \|\| {};
	24
c0bbd038	25	my $self = bless {
8f0bb968 DM	26	haenv => $haenv,
	27	ms => $ms, # master status
	28	ns => $ns, # PVE::HA::NodeStatus
59fd7207	29	ss => $ss, # service status
c0bbd038 DM	30	}, $class;
	31
	32	return $self;
	33	}
	34
d84da043 DM	35	sub cleanup {
	36	my ($self) = @_;
	37
	38	# todo: ?
	39	}
	40
8f0bb968	41	sub flush_master_status {
c0bbd038 DM	42	my ($self) = @_;
c0bbd038 DM	43
59fd7207	44	my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});
c0bbd038	45
8f0bb968	46	$ms->{node_status} = $ns->{status};
59fd7207 DM	47	$ms->{service_status} = $ss;
59fd7207 DM	48
8f0bb968 DM	49	$haenv->write_manager_status($ms);
8f0bb968 DM	50	}
c0bbd038	51
819c61f0	52	# Attention: must be idempotent (alway return the same result for same input!)
f7ccd1b3 DM	53	sub select_service_node {
	54	my ($self, $service_conf) = @_;
	55
	56	my $ns = $self->{ns};
	57
	58	my $pref_node = $service_conf->{node};
	59
	60	return $pref_node if $ns->node_is_online($pref_node);
	61
	62	my $online_nodes = $ns->list_online_nodes();
	63
	64	return shift @$online_nodes;
	65	}
	66
c4a221bc DM	67	my $uid_counter = 0;
c4a221bc DM	68
618fbeda DM	69	my $valid_service_states = {
	70	stopped => 1,
	71	request_stop => 1,
	72	started => 1,
	73	fence => 1,
8456bde2	74	move => 1,
618fbeda DM	75	migrate => 1,
	76	error => 1,
	77	};
	78
4e01bc86 DM	79	my $change_service_state = sub {
	80	my ($self, $sid, $new_state, %params) = @_;
	81
	82	my ($haenv, $ss) = ($self->{haenv}, $self->{ss});
	83
	84	my $sd = $ss->{$sid} \|\| die "no such service '$sid";
	85
	86	my $old_state = $sd->{state};
	87
	88	die "no state change" if $old_state eq $new_state; # just to be sure
	89
618fbeda DM	90	die "invalid CRM service state '$new_state'\n" if !$valid_service_states->{$new_state};
618fbeda DM	91
4e01bc86 DM	92	my $changes = '';
	93	foreach my $k (keys %params) {
	94	my $v = $params{$k};
	95	next if defined($sd->{$k}) && $sd->{$k} eq $v;
	96	$changes .= ", " if $changes;
	97	$changes .= "$k = $v";
	98	$sd->{$k} = $v;
	99	}
	100
	101	$sd->{state} = $new_state;
c4a221bc DM	102	$uid_counter++;
c4a221bc DM	103	$sd->{uid} = md5_base64($new_state . $$ . time() . $uid_counter);
4e01bc86 DM	104
	105	# fixme: cleanup state (remove unused values)
	106
	107	$changes = " ($changes)" if $changes;
	108	$haenv->log('info', "service '$sid': state changed to '$new_state' $changes\n");
	109	};
	110
332170bd	111	# read LRM status for all active nodes
c4a221bc	112	sub read_lrm_status {
332170bd	113	my ($self) = @_;
c4a221bc	114
332170bd	115	my $nodes = $self->{ns}->list_online_nodes();
c4a221bc DM	116	my $haenv = $self->{haenv};
	117
	118	my $res = {};
	119
332170bd	120	foreach my $node (@$nodes) {
c4a221bc DM	121	my $ls = $haenv->read_lrm_status($node);
	122	foreach my $uid (keys %$ls) {
	123	next if $res->{$uid}; # should not happen
	124	$res->{$uid} = $ls->{$uid};
	125	}
	126	}
	127
	128	return $res;
	129	}
	130
aa98a844 DM	131	# read new crm commands and save them into crm master status
	132	sub update_crm_commands {
	133	my ($self) = @_;
	134
	135	my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});
	136
	137	my $cmdlist = $haenv->read_crm_commands();
	138
	139	foreach my $cmd (split(/\n/, $cmdlist)) {
	140	chomp $cmd;
	141
	142	if ($cmd =~ m/^migrate\s+(\S+)\s+(\S+)$/) {
	143	my ($sid, $node) = ($1, $2);
	144	if (my $sd = $ss->{$sid}) {
	145	if (!$ns->node_is_online($node)) {
	146	$haenv->log('err', "crm command error - node not online: $cmd");
	147	} else {
	148	if ($node eq $sd->{node}) {
	149	$haenv->log('info', "ignore crm command - service already on target node: $cmd");
	150	} else {
	151	$haenv->log('info', "got crm command: $cmd");
	152	$ss->{$sid}->{cmd} = [ 'migrate', $node];
	153	}
	154	}
	155	} else {
	156	$haenv->log('err', "crm command error - no such service: $cmd");
	157	}
	158
	159	} else {
	160	$haenv->log('err', "unable to parse crm command: $cmd");
	161	}
	162	}
	163
	164	}
	165
8f0bb968 DM	166	sub manage {
8f0bb968 DM	167	my ($self) = @_;
c0bbd038	168
59fd7207	169	my ($haenv, $ms, $ns, $ss) = ($self->{haenv}, $self->{ms}, $self->{ns}, $self->{ss});
c0bbd038	170
332170bd	171	$ns->update($haenv->get_node_info());
c79442f2 DM	172
	173	if (!$ns->node_is_online($haenv->nodename())) {
	174	$haenv->log('info', "master seems offline\n");
	175	return;
	176	}
	177
332170bd	178	my $lrm_status = $self->read_lrm_status();
c4a221bc	179
f7ccd1b3 DM	180	my $sc = $haenv->read_service_config();
	181
	182	# compute new service status
	183
	184	# add new service
	185	foreach my $sid (keys %$sc) {
	186	next if $ss->{$sid}; # already there
	187	$haenv->log('info', "Adding new service '$sid'\n");
	188	# assume we are running to avoid relocate running service at add
8456bde2	189	$ss->{$sid} = { state => 'started', node => $sc->{$sid}->{node}};
f7ccd1b3 DM	190	}
f7ccd1b3 DM	191
aa98a844 DM	192	$self->update_crm_commands();
aa98a844 DM	193
c79442f2 DM	194	for (;;) {
c79442f2 DM	195	my $repeat = 0;
f7ccd1b3	196
c79442f2 DM	197	foreach my $sid (keys %$ss) {
	198	my $sd = $ss->{$sid};
	199	my $cd = $sc->{$sid} \|\| { state => 'disabled' };
f7ccd1b3	200
a875fbe8 DM	201	my $lrm_res = $sd->{uid} ? $lrm_status->{$sd->{uid}} : undef;
a875fbe8 DM	202
c79442f2 DM	203	my $last_state = $sd->{state};
	204
	205	if ($last_state eq 'stopped') {
	206
a875fbe8	207	$self->next_state_stopped($sid, $cd, $sd);
f7ccd1b3	208
c79442f2	209	} elsif ($last_state eq 'started') {
f7ccd1b3	210
a875fbe8	211	$self->next_state_started($sid, $cd, $sd);
f7ccd1b3	212
c79442f2	213	} elsif ($last_state eq 'migrate') {
f7ccd1b3	214
e88469ba DM	215	# check result from LRM daemon
	216	if ($lrm_res) {
	217	my $exit_code = $lrm_res->{exit_code};
	218	if ($exit_code == 0) {
	219	&$change_service_state($self, $sid, 'started', node => $sd->{target});
	220	} else {
	221	$haenv->log('err', "service '$sid' - migration failed (exit code $exit_code)");
	222	&$change_service_state($self, $sid, 'started', node => $sd->{node});
	223	}
	224	}
f7ccd1b3	225
8456bde2 DM	226	} elsif ($last_state eq 'move') {
	227
	228	#die "implement me";
	229
c79442f2	230	} elsif ($last_state eq 'fence') {
f7ccd1b3	231
21e37ed4	232	# do nothing here - wait until fenced
f7ccd1b3	233
c79442f2	234	} elsif ($last_state eq 'request_stop') {
f7ccd1b3	235
a875fbe8 DM	236	# check result from LRM daemon
	237	if ($lrm_res) {
	238	my $exit_code = $lrm_res->{exit_code};
618fbeda DM	239	if ($exit_code == 0) {
	240	&$change_service_state($self, $sid, 'stopped');
	241	} else {
	242	&$change_service_state($self, $sid, 'error'); # fixme: what state?
	243	}
618fbeda DM	244	}
618fbeda DM	245
e88469ba DM	246	} elsif ($last_state eq 'error') {
	247
	248	# fixme:
	249
a875fbe8 DM	250	} else {
	251
	252	die "unknown service state '$last_state'";
618fbeda	253	}
21e37ed4	254
c79442f2	255	$repeat = 1 if $sd->{state} ne $last_state;
f7ccd1b3 DM	256	}
f7ccd1b3 DM	257
21e37ed4 DM	258	# handle fencing
	259	my $fenced_nodes = {};
	260	foreach my $sid (keys %$ss) {
	261	my $sd = $ss->{$sid};
	262	next if $sd->{state} ne 'fence';
	263
	264	if (!defined($fenced_nodes->{$sd->{node}})) {
	265	$fenced_nodes->{$sd->{node}} = $ns->fence_node($sd->{node}) \|\| 0;
	266	}
	267
	268	next if !$fenced_nodes->{$sd->{node}};
	269
	270	# node fence was sucessful - mark service as stopped
	271	&$change_service_state($self, $sid, 'stopped');
	272	}
	273
c79442f2	274	last if !$repeat;
f7ccd1b3	275	}
f7ccd1b3 DM	276
	277	# remove stale services
	278	# fixme:
	279
8f0bb968	280	$self->flush_master_status();
c0bbd038 DM	281	}
c0bbd038 DM	282
a875fbe8 DM	283	# functions to compute next service states
	284	# $cd: service configuration data (read only)
	285	# $sd: service status data (read only)
	286	#
	287	# Note: use change_service_state() to alter state
	288	#
	289
	290	sub next_state_stopped {
	291	my ($self, $sid, $cd, $sd) = @_;
	292
	293	my $haenv = $self->{haenv};
e88469ba	294	my $ns = $self->{ns};
a875fbe8	295
ff6f1c5c DM	296	if ($sd->{node} ne $cd->{node}) {
	297	# this can happen if we fence a node with active migrations
	298	# hack: modify $sd (normally this should be considered read-only)
	299	$haenv->log('info', "fixup service '$sid' location ($sd->{node} => $cd->{node}");
	300	$sd->{node} = $cd->{node};
	301	}
	302
94b7ebe2 DM	303	if ($sd->{cmd}) {
	304	my ($cmd, $target) = @{$sd->{cmd}};
	305	delete $sd->{cmd};
	306
	307	if ($cmd eq 'migrate') {
	308	if (!$ns->node_is_online($target)) {
	309	$haenv->log('err', "ignore service '$sid' migrate request - node '$target' not online");
e88469ba DM	310	} elsif ($sd->{node} eq $target) {
e88469ba DM	311	$haenv->log('info', "ignore service '$sid' migrate request - service already on node '$target'");
94b7ebe2 DM	312	} else {
	313	$haenv->change_service_location($sid, $target);
	314	$cd->{node} = $sd->{node} = $target; # fixme: $sd is read-only??!!
	315	$haenv->log('info', "migrate service '$sid' to node '$target' (stopped)");
	316	}
	317	} else {
	318	$haenv->log('err', "unknown command '$cmd' for service '$sid'");
	319	}
	320	}
	321
a875fbe8 DM	322	if ($cd->{state} eq 'disabled') {
a875fbe8 DM	323	# do nothing
e88469ba DM	324	return;
	325	}
	326
	327	if ($cd->{state} eq 'enabled') {
a875fbe8 DM	328	if (my $node = $self->select_service_node($cd)) {
	329	if ($node && ($sd->{node} ne $node)) {
	330	$haenv->change_service_location($sid, $node);
	331	}
	332	&$change_service_state($self, $sid, 'started', node => $node);
	333	} else {
	334	# fixme: warn
	335	}
e88469ba DM	336
e88469ba DM	337	return;
a875fbe8	338	}
e88469ba DM	339
e88469ba DM	340	$haenv->log('err', "service '$sid' - unknown state '$cd->{state}' in service configuration");
a875fbe8 DM	341	}
	342
	343	sub next_state_started {
	344	my ($self, $sid, $cd, $sd) = @_;
	345
	346	my $haenv = $self->{haenv};
	347	my $ns = $self->{ns};
	348
	349	if (!$ns->node_is_online($sd->{node})) {
	350
	351	&$change_service_state($self, $sid, 'fence');
e88469ba DM	352	return;
e88469ba DM	353	}
a875fbe8	354
e88469ba DM	355	if ($cd->{state} eq 'disabled') {
	356	&$change_service_state($self, $sid, 'request_stop');
	357	return;
	358	}
	359
	360	if ($cd->{state} eq 'enabled') {
	361	my $node = $self->select_service_node($cd);
	362
	363	if ($sd->{cmd}) {
	364	my ($cmd, $target) = @{$sd->{cmd}};
	365	delete $sd->{cmd};
	366
	367	if ($cmd eq 'migrate') {
	368	if (!$ns->node_is_online($target)) {
	369	$haenv->log('err', "ignore service '$sid' migrate request - node '$target' not online");
	370	} elsif ($sd->{node} eq $target) {
	371	$haenv->log('info', "ignore service '$sid' migrate request - service already on node '$target'");
	372	} else {
	373	$node = $target;
	374	}
a875fbe8	375	} else {
e88469ba	376	$haenv->log('err', "unknown command '$cmd' for service '$sid'");
a875fbe8	377	}
e88469ba DM	378	}
	379
	380	if ($node && ($sd->{node} ne $node)) {
	381	$haenv->log('info', "migrate service '$sid' to node '$node' (running)");
	382	&$change_service_state($self, $sid, 'migrate', node => $sd->{node}, target => $node);
a875fbe8	383	} else {
e88469ba	384	# do nothing
a875fbe8	385	}
e88469ba DM	386
	387	return;
	388	}
	389
	390	$haenv->log('err', "service '$sid' - unknown state '$cd->{state}' in service configuration");
a875fbe8	391	}
c0bbd038 DM	392
c0bbd038 DM	393	1;