红帽全球峰会9.9. 故障排除
请注意，当运行集群时，您应该会在两个集群节点的日志中看到类似如下的消息：
INFO [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-10,shared=udp) ISPN000094: Received new cluster view: [node1/keycloak|1] (2) [node1/keycloak, node2/keycloak]
INFO [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-10,shared=udp) ISPN000094: Received new cluster view: [node1/keycloak|1] (2) [node1/keycloak, node2/keycloak]Copy to Clipboard Copied! Toggle word wrap Toggle overflow 如果您只看到提到的一个节点，您的集群主机可能无法连接在一起。
通常，最好在私有网络上具有集群节点，而无需防火墙以用于它们之间的通信。防火墙只能对您的网络的公共访问点启用。如果出于某种原因，您仍需要在集群节点上启用防火墙，则需要打开一些端口。默认值为 UDP 端口 55200 和多播端口 45688，多播地址为 230.0.0.4。请注意，如果您想要为 JGroups 堆栈启用诊断等其他功能，您可能需要打开更多端口。Red Hat Single Sign-On 将大多数集群工作委托给 Infinispan/JGroups。有关更多信息，请参阅 JBoss EAP 配置指南中的 JGroups。
- 如果您对故障转移支持（高可用性）、驱除、过期和缓存调整感兴趣，请参阅 第 10 章 服务器缓存配置。
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