After rebooting the ZCM appliance, the services seems to stop working (ZCC unresponsive) after a few minutes. This may be caused by a problem with Zookeeper. The zookeeper.log shows the following errors:
[09 Jan 2024 16:15:07] [DEBUG] Accepted socket connection from /192.168.16.10:36930 (org.apache.zookeeper.server.NIOServerCnxnFactory:272)
[09 Jan 2024 16:15:07] [WARN] Close of session 0x0 (org.apache.zookeeper.server.NIOServerCnxn:380)
java.io.IOException: ZooKeeperServer not running
at org.apache.zookeeper.server.NIOServerCnxn.readLength(NIOServerCnxn.java:554)
at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:339)
at org.apache.zookeeper.server.NIOServerCnxnFactory$IOWorkRequest.doWork(NIOServerCnxnFactory.java:508)
at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:154)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
[09 Jan 2024 16:15:07] [DEBUG] Closed socket connection for client /192.168.16.10:36930 (no session established for client) (org.apache.zookeeper.server.NIOServerCnxn:626)
[09 Jan 2024 16:15:07] [DEBUG] Accepted socket connection from /127.0.0.1:40050 (org.apache.zookeeper.server.NIOServerCnxnFactory:272)
[09 Jan 2024 16:15:07] [WARN] Close of session 0x0 (org.apache.zookeeper.server.NIOServerCnxn:380)
java.io.IOException: ZooKeeperServer not running
at org.apache.zookeeper.server.NIOServerCnxn.readLength(NIOServerCnxn.java:554)
at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:339)
at org.apache.zookeeper.server.NIOServerCnxnFactory$IOWorkRequest.doWork(NIOServerCnxnFactory.java:508)
at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:154)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
[09 Jan 2024 16:15:07] [DEBUG] Closed socket connection for client /127.0.0.1:40050 (no session established for client) (org.apache.zookeeper.server.NIOServerCnxn:626)
This problem can be resolved by removing any 127.0.0.2 loopback address defined in '/etc/hosts' file. The 127.0.0.1 loopback address can remain. After doing so, reboot the appliance server.
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