MultiCast Address and Port

本文档介绍了如何为WebLogic集群配置多播地址和端口,包括选择合适的多播地址、避免与其他集群冲突的方法,以及多层架构下通过防火墙的多播设置等关键信息。

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MulticastTest tool:
[url]http://download.oracle.com/docs/cd/E11035_01/wls100/admin_ref/utils.html#wp1199798[/url]

Setting up WebLogic Clusters
[url]http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/setup.html#wp700950[/url]

Cluster Multicast Address and Port
Identify the address and port you will dedicate to multicast communications for your cluster. A multicast address is an IP address between 224.0.0.0 and 239.255.255.255.

Note: The default multicast value used by WebLogic Server is 239.192.0.0. You should not use any multicast address with the value x.0.0.1.

Server instances in a cluster communicate with each other using multicast?athey use multicast to announce their services, and to issue periodic heartbeats that indicate continued availability.

The multicast address for a cluster should not be used for any purpose other than cluster communications. If the machine where the cluster multicast address exists hosts or is accessed by cluster-external programs that use multicast communication, make sure that those multicast communications use a different port than the cluster multicast port.

Multicast and Multiple Clusters
Multiple clusters on a network may share a multicast address and multicast port combination if necessary.

Multicast and Multi-Tier Clusters
If you are setting up the Recommended Multi-Tier Architecture, described in Cluster Architectures, with a firewall between the clusters, you will need two dedicated multicast addresses: one for the presentation (servlet) cluster and one for the object cluster. Using two multicast addresses ensures that the firewall does not interfere with cluster communication.

Multicast and Multiple Clusters
[b]Multiple clusters on a network may share a multicast address and multicast port combination if necessary.[/b]

Troubleshooting Multicast Configuration
[url]http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/multicast_configuration.html[/url]


Connect cluster instead of sperate managed servers:
[url]http://fixunix.com/weblogic/220928-clustering-set-up-question.html[/url]


WebLogic Server Communication in a Cluster
[url]http://blog.youkuaiyun.com/pyliu8621/archive/2005/03/08/314920.aspx[/url]
#include "udpsocket.h" #include <QHostAddress> #include <QNetworkInterface> #include <QDebug> UdpSocket::UdpSocket(quint16 port, QObject *parent) : QObject(parent) { m_udpSocket = new QUdpSocket(this); // 启用广播选项 m_udpSocket->setSocketOption(QUdpSocket::BroadcastSocketOption, 1); // 绑定本地端口 if (!m_udpSocket->bind(port, QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint)) { qWarning() << "Failed to bind UDP socket on port" << port; } else { qDebug() << "UDP socket bound to port" << port; } connect(m_udpSocket, &QUdpSocket::readyRead, this, &UdpSocket::onReadyRead); } UdpSocket::~UdpSocket() { m_udpSocket->close(); delete m_udpSocket; } void UdpSocket::setBroadcastEnabled(bool enabled) { m_udpSocket->setSocketOption(QUdpSocket::BroadcastSocketOption, enabled ? 1 : 0); } void UdpSocket::sendData(const QByteArray &data, const QString &host, quint16 port) { qint64 sent = m_udpSocket->writeDatagram(data, QHostAddress(host), port); if (sent == -1) { qWarning() << "Failed to send UDP datagram to" << host << ":" << port; } else { qDebug() << "Sent" << sent << "bytes to" << host << ":" << port; } } void UdpSocket::broadcastData(const QByteArray &data, quint16 port) { // 使用IPv4广播地址 qint64 sent = m_udpSocket->writeDatagram(data, QHostAddress::Broadcast, port); if (sent == -1) { qWarning() << "Failed to broadcast UDP datagram on port" << port; } else { qDebug() << "Broadcasted" << sent << "bytes on port" << port; } } bool UdpSocket::joinMulticastGroup(const QString &multicastAddress) { QHostAddress address(multicastAddress); if (!address.isMulticast()) { qWarning() << multicastAddress << "is not a multicast address"; return false; } return m_udpSocket->joinMulticastGroup(address); } void UdpSocket::onReadyRead() { while (m_udpSocket->hasPendingDatagrams()) { QByteArray datagram; datagram.resize(m_udpSocket->pendingDatagramSize()); QHostAddress sender; quint16 senderPort; m_udpSocket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort); emit dataReceived(datagram, sender.toString(), senderPort); } } 把这个里面的信号槽改成qt4.8.6能用的
最新发布
07-04
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