// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.ha;
import java.util.List;
import java.util.Map;
import javax.ejb.Local;
import javax.naming.ConfigurationException;
import org.apache.log4j.Logger;
import com.cloud.agent.AgentManager;
import com.cloud.agent.api.FenceAnswer;
import com.cloud.agent.api.FenceCommand;
import com.cloud.exception.AgentUnavailableException;
import com.cloud.exception.OperationTimedoutException;
import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.host.dao.HostDao;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.resource.ResourceManager;
import com.cloud.utils.component.Inject;
import com.cloud.vm.VMInstanceVO;
@Local(value=FenceBuilder.class)
public class KVMFencer implements FenceBuilder {
private static final Logger s_logger = Logger.getLogger(KVMFencer.class);
String _name;
@Inject HostDao _hostDao;
@Inject AgentManager _agentMgr;
@Inject ResourceManager _resourceMgr;
@Override
public boolean configure(String name, Map<String, Object> params)
throws ConfigurationException {
// TODO Auto-generated method stub
_name = name;
return true;
}
@Override
public String getName() {
return _name;
}
@Override
public boolean start() {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean stop() {
// TODO Auto-generated method stub
return true;
}
public KVMFencer() {
super();
}
@Override
public Boolean fenceOff(VMInstanceVO vm, HostVO host) {
if (host.getHypervisorType() != HypervisorType.KVM) {
s_logger.debug("Don't know how to fence non kvm hosts " + host.getHypervisorType());
return null;
}
List<HostVO> hosts = _resourceMgr.listAllHostsInCluster(host.getClusterId());
FenceCommand fence = new FenceCommand(vm, host);
for (HostVO h : hosts) {
if (h.getHypervisorType() == HypervisorType.KVM) {
if( h.getStatus() != Status.Up ) {
continue;
}
if( h.getId() == host.getId() ) {
continue;
}
FenceAnswer answer;
try {
answer = (FenceAnswer)_agentMgr.send(h.getId(), fence);
} catch (AgentUnavailableException e) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Moving on to the next host because " + h.toString() + " is unavailable");
}
continue;
} catch (OperationTimedoutException e) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Moving on to the next host because " + h.toString() + " is unavailable");
}
continue;
}
if (answer != null && answer.getResult()) {
return true;
}
}
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Unable to fence off " + vm.toString() + " on " + host.toString());
}
return false;
}
}