/*************************************************************************
* Copyright 2009-2012 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
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*
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*
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*
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* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
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* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
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* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
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* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.walrus.storage;
import java.io.File;
import java.util.concurrent.ExecutionException;
import org.apache.log4j.Logger;
import com.eucalyptus.component.Component;
import com.eucalyptus.component.Components;
import com.eucalyptus.util.EucalyptusCloudException;
import com.eucalyptus.walrus.WalrusBackend;
import com.eucalyptus.walrus.entities.DRBDInfo;
import com.eucalyptus.walrus.entities.WalrusInfo;
import com.eucalyptus.walrus.util.WalrusProperties;
import edu.ucsb.eucalyptus.util.SystemUtil;
public class DRBDStorageManager extends FileSystemStorageManager {
private static Logger LOG = Logger.getLogger(DRBDStorageManager.class);
private static final String PRIMARY_ROLE = "Primary";
private static final String SECONDARY_ROLE = "Secondary";
private static final String DSTATE_UPTODATE = "UpToDate";
private static final String DSTATE_UNKNOWN = "Unknown";
private static final String CSTATE_WFCONNECTION = "WFConnection";
private static final String CSTATE_CONNECTED = "Connected";
public DRBDStorageManager() {}
private String getConnectionStatus() throws ExecutionException, EucalyptusCloudException {
String returnValue = SystemUtil.run(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "cstate", DRBDInfo.getDRBDInfo().getResource()});
if (returnValue.length() == 0) {
throw new EucalyptusCloudException("Unable to get connection status for resource: " + DRBDInfo.getDRBDInfo().getResource());
}
return returnValue;
}
private String getDataStatus() throws ExecutionException, EucalyptusCloudException {
String returnValue = SystemUtil.run(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "dstate", DRBDInfo.getDRBDInfo().getResource()});
if (returnValue.length() == 0) {
throw new EucalyptusCloudException("Unable to get data status for resource: " + DRBDInfo.getDRBDInfo().getResource());
}
return returnValue;
}
/**
* @return
* @throws ExecutionException
* @throws EucalyptusCloudException
*/
private String getRole() throws ExecutionException, EucalyptusCloudException {
String returnValue = SystemUtil.run(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "role", DRBDInfo.getDRBDInfo().getResource()});
if (returnValue.length() == 0) {
throw new EucalyptusCloudException("Unable to get role for resource: " + DRBDInfo.getDRBDInfo().getResource());
}
return returnValue;
}
/* This method does not check if resource is already primary */
/**
* @throws ExecutionException
* @throws EucalyptusCloudException
*/
private void makePrimary() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "primary", DRBDInfo.getDRBDInfo().getResource()}) != 0) {
throw new EucalyptusCloudException("Unable to make resource " + DRBDInfo.getDRBDInfo().getResource() + " primary");
}
}
/* This method does not check if resource is already secondary */
/**
* @throws ExecutionException
* @throws EucalyptusCloudException
*/
private void makeSecondary() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "secondary", DRBDInfo.getDRBDInfo().getResource()}) != 0) {
throw new EucalyptusCloudException("Unable to make resource " + DRBDInfo.getDRBDInfo().getResource() + " secondary");
}
}
private void connectResource() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "connect", DRBDInfo.getDRBDInfo().getResource()}) != 0) {
throw new EucalyptusCloudException("Unable to connect resource: " + DRBDInfo.getDRBDInfo().getResource());
}
}
private void disconnectResource() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "disconnect", DRBDInfo.getDRBDInfo().getResource()}) != 0) {
throw new EucalyptusCloudException("Unable to disconnect resource: " + DRBDInfo.getDRBDInfo().getResource());
}
}
// create config
private void generateConfig() {
}
private void mountPrimary() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {"mount", DRBDInfo.getDRBDInfo().getBlockDevice()}) != 0) {
throw new EucalyptusCloudException("Unable to mount " + DRBDInfo.getDRBDInfo().getBlockDevice() + " as "
+ WalrusInfo.getWalrusInfo().getStorageDir());
}
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "chown", "eucalyptus:eucalyptus",
WalrusInfo.getWalrusInfo().getStorageDir()}) != 0) {
throw new EucalyptusCloudException("Unable to change perms on: " + WalrusInfo.getWalrusInfo().getStorageDir());
}
SystemUtil.setEucaReadWriteOnly(WalrusInfo.getWalrusInfo().getStorageDir());
}
private void unmountPrimary() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {"umount", DRBDInfo.getDRBDInfo().getBlockDevice()}) != 0) {
throw new EucalyptusCloudException("Unable to unmount " + DRBDInfo.getDRBDInfo().getBlockDevice());
}
}
/**
* We use /proc/mounts because EUCA_ROOT_WRAPPER uses a syscall and does not update /etc/mtab
*
* @return
* @throws ExecutionException
*/
private boolean isMounted() throws EucalyptusCloudException {
String returnValue = SystemUtil.run(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "cat", "/proc/mounts"});
if (returnValue.length() > 0) {
if (returnValue.contains(DRBDInfo.getDRBDInfo().getBlockDevice())) {
return true;
}
}
return false;
}
private boolean isPrimary() throws EucalyptusCloudException, ExecutionException {
String roleString = getRole();
String[] roleParts = roleString.split("/");
if (roleParts.length > 1) {
if (roleParts[0].startsWith(PRIMARY_ROLE)) {
return true;
} else {
return false;
}
} else {
throw new EucalyptusCloudException("Unable to parse role.");
}
}
private boolean isSecondary() throws EucalyptusCloudException, ExecutionException {
String roleString = getRole();
String[] roleParts = roleString.split("/");
if (roleParts.length > 1) {
if (roleParts[0].startsWith(SECONDARY_ROLE)) {
return true;
} else {
return false;
}
} else {
throw new EucalyptusCloudException("Unable to parse role.");
}
}
private boolean isPeerPrimary() throws EucalyptusCloudException, ExecutionException {
String roleString = getRole();
String[] roleParts = roleString.split("/");
if (roleParts.length > 1) {
if (roleParts[1].startsWith(PRIMARY_ROLE)) {
return true;
} else {
return false;
}
} else {
throw new EucalyptusCloudException("Unable to parse role.");
}
}
private boolean isPeerSecondary() throws EucalyptusCloudException, ExecutionException {
String roleString = getRole();
String[] roleParts = roleString.split("/");
if (roleParts.length > 1) {
if (roleParts[1].startsWith(SECONDARY_ROLE)) {
return true;
} else {
return false;
}
} else {
throw new EucalyptusCloudException("Unable to parse role.");
}
}
private boolean isConnected() throws ExecutionException, EucalyptusCloudException {
String cstateString = getConnectionStatus();
if ((cstateString != null) && cstateString.startsWith(CSTATE_CONNECTED)) {
return true;
} else {
return false;
}
}
private boolean isUpToDate() throws EucalyptusCloudException, ExecutionException {
String dstateString = getDataStatus();
String[] dstateParts = dstateString.split("/");
if (dstateParts.length > 1) {
if (dstateParts[0].startsWith(DSTATE_UPTODATE) && (dstateParts[1].startsWith(DSTATE_UPTODATE))) {
return true;
} else {
return false;
}
} else {
throw new EucalyptusCloudException("Unable to get resource dstate.");
}
}
private void checkLocalDisk() throws EucalyptusCloudException {
String blockDevice = DRBDInfo.getDRBDInfo().getBlockDevice();
File mount = new File(blockDevice);
if (!mount.exists()) {
throw new EucalyptusCloudException("Block device " + blockDevice + " not found.");
}
String storageDir = WalrusInfo.getWalrusInfo().getStorageDir();
File root = new File(storageDir);
if (!root.exists()) {
throw new EucalyptusCloudException("Storage directory " + storageDir + " not found.");
}
}
public void becomeMaster() throws EucalyptusCloudException, ExecutionException {
checkLocalDisk();
// role, cstate, dstate
if (!isPrimary()) {
// make primary
if (isPeerPrimary()) {
throw new EucalyptusCloudException("Peer is primary and I am supposed to be master! Unable to proceed!");
}
makePrimary();
}
if (!isConnected()) {
try {
connectResource();
} catch (Exception e) {
LOG.error(e);
}
}
// mount
if (!isMounted()) {
try {
mountPrimary();
} catch (Exception e) {
// undo
LOG.error(e, e);
if (isPrimary()) {
makeSecondary();
}
throw new EucalyptusCloudException("Unable to mount primary: " + e);
}
}
// verify state
if (!isPrimary()) {
throw new EucalyptusCloudException("Unable to make resource primary.");
}
}
public void becomeSlave() throws EucalyptusCloudException, ExecutionException {
checkLocalDisk();
// check mount point, block device, role, cstate, dstate
if (isMounted()) {
unmountPrimary();
}
if (!isSecondary()) {
// make secondary
makeSecondary();
}
if (!isConnected()) {
try {
connectResource();
} catch (Exception e) {
LOG.error(e);
}
}
// verify state
if (!isSecondary()) {
throw new EucalyptusCloudException("Unable to make resource secondary.");
}
if (!isPeerPrimary()) {
LOG.warn("Warning! Peer is not primary. No usable component?");
}
}
// check status
public void secondaryDrasticRecovery() throws ExecutionException, EucalyptusCloudException {
if (SystemUtil.runAndGetCode(new String[] {WalrusProperties.EUCA_ROOT_WRAPPER, "drbdadm", "--", "--discard-my-data", "connect",
DRBDInfo.getDRBDInfo().getResource()}) != 0) {
throw new EucalyptusCloudException("Unable to recover from split brain for resource: " + DRBDInfo.getDRBDInfo().getResource());
}
}
@Override
public void enable() throws EucalyptusCloudException {
try {
becomeMaster();
} catch (ExecutionException e) {
throw new EucalyptusCloudException(e);
}
}
@Override
public void disable() throws EucalyptusCloudException {
try {
becomeSlave();
} catch (ExecutionException e) {
throw new EucalyptusCloudException(e);
}
}
// verify consistency
@Override
public void check() throws EucalyptusCloudException {
try {
boolean notConnected = false;
if (!isConnected()) {
try {
connectResource();
} catch (Exception e) {
LOG.error(e);
}
}
if (Component.State.ENABLED.equals(Components.lookup(WalrusBackend.class).getState())) {
if (!isPrimary() || !isMounted()) {
throw new EucalyptusCloudException("I am the master, but not DRBD primary. Please make me primary. Aborting!");
}
} else {
if ((isConnected()) && (!isUpToDate())) {
throw new EucalyptusCloudException("Resource connected but not up to date!");
}
if (Component.State.DISABLED.equals(Components.lookup(WalrusBackend.class).getState())) {
if (!isSecondary()) {
LOG.warn("I am the slave, but not DRBD secondary. Trying to become secondary...");
if (isMounted()) {
unmountPrimary();
}
// make secondary
makeSecondary();
if (!isSecondary()) {
throw new EucalyptusCloudException("Attempt to set secondary failed. Unable to proceed!");
}
}
}
}
} catch (ExecutionException ex) {
throw new EucalyptusCloudException(ex);
}
}
@Override
public void start() throws EucalyptusCloudException {
try {
becomeSlave();
} catch (ExecutionException e) {
throw new EucalyptusCloudException(e);
}
}
@Override
public void stop() throws EucalyptusCloudException {
try {
if (isMounted()) {
unmountPrimary();
}
if (!isSecondary()) {
// make secondary
makeSecondary();
}
} catch (ExecutionException ex) {
throw new EucalyptusCloudException(ex);
}
}
}