/**
* 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 org.apache.hadoop.yarn.server.webproxy;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.util.ShutdownHookManager;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.yarn.YarnException;
import org.apache.hadoop.yarn.YarnUncaughtExceptionHandler;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.service.CompositeService;
/**
* ProxyServer will sit in between the end user and AppMaster
* web interfaces.
*/
public class WebAppProxyServer extends CompositeService {
/**
* Priority of the ResourceManager shutdown hook.
*/
public static final int SHUTDOWN_HOOK_PRIORITY = 30;
private static final Log LOG = LogFactory.getLog(WebAppProxyServer.class);
private WebAppProxy proxy = null;
public WebAppProxyServer() {
super(WebAppProxyServer.class.getName());
}
@Override
public synchronized void init(Configuration conf) {
Configuration config = new YarnConfiguration(conf);
try {
doSecureLogin(conf);
} catch(IOException ie) {
throw new YarnException("Proxy Server Failed to login", ie);
}
proxy = new WebAppProxy();
addService(proxy);
super.init(config);
}
/**
* Log in as the Kerberose principal designated for the proxy
* @param conf the configuration holding this information in it.
* @throws IOException on any error.
*/
protected void doSecureLogin(Configuration conf) throws IOException {
SecurityUtil.login(conf, YarnConfiguration.PROXY_KEYTAB,
YarnConfiguration.PROXY_PRINCIPAL);
}
/**
* Wait for service to finish.
* (Normally, it runs forever.)
*/
private void join() {
proxy.join();
}
public static void main(String[] args) {
Thread.setDefaultUncaughtExceptionHandler(new YarnUncaughtExceptionHandler());
StringUtils.startupShutdownMessage(WebAppProxyServer.class, args, LOG);
try {
WebAppProxyServer proxy = new WebAppProxyServer();
ShutdownHookManager.get().addShutdownHook(
new CompositeServiceShutdownHook(proxy),
SHUTDOWN_HOOK_PRIORITY);
YarnConfiguration conf = new YarnConfiguration();
proxy.init(conf);
proxy.start();
proxy.join();
} catch (Throwable t) {
LOG.fatal("Error starting Proxy server", t);
System.exit(-1);
}
}
}