Troubleshooting server cluster configuration

  • What am I looking for when I verify the lists of Host and Server Names from DB on the page?

    When you view the two lists of host IP addresses and server names, make sure all servers in your cluster are listed there.

    • If any of the servers are missing, you need to check that the Weblogic server is running and pointing to the database expected.

    • If you see an unexpected machine in the lists, some unknown Weblogic server is pulling [‘stealing’] the database connection from your database. This can cause data inconsistency. Therefore, you need to detach the Weblogic server from your database, and then run the SQL command delete from appserver against your the BPMainDB database, and restart all the servers.

  • Why are some of the servers shown only with their Cache information but not with their server names?

    Some of the servers may be seen according to their Cache information, but not their server names. Server Name and Server Port information derives from the database. This view means that the servers are sharing same database.

  • What if the Cache Port column indicates a port number other than the default 8088?

    By default, the Cache port number is 8088. This is the port number through which the cache services communicate with each other. A different port number does not necessarily mean there is a problem, but consistency across Weblogic servers is good practice.

  • What does it mean when the Cache Start Time column is blank, or there is a big interval between 2 cache start times?

    • Cache Start Time column is blank:

      If there is a No shown under the Cache Is Clustered column, and if the Cache Port and Cache Start Time columns show no values, the cache service is probably down.

    • Large interval between two cache start times:

      If you see a large interval between any two cache start times, the most recent time probably means there is a service restart, possible a sign of a problem

  • How do I interpret ‘yes’ or ‘no’ under the Synchronized column?

    This column indicates the results of the synchronization test across a cluster.

    If the value is Yes, the cluster is synchronized. If the value is No for one or more cluster, you need to investigate the problem.