5.12.2. Zookeeper Server process

This host-level alert is triggered if the ZooKeeper server process cannot be determined to be up and listening on the network for the configured critical threshold, given in seconds. It uses the Nagios check_tcp plugin.

5.12.2.1. Potential causes

The ZooKeeper server process is down on the host.
The ZooKeeper server process is up and running but not listening on the correct network port (default 2181).
The Nagios server cannot connect to the ZooKeeper server through the network.

5.12.2.2. Possible remedies

Check for any errors in the ZooKeeper logs (/var/log/hbase/) and restart the ZooKeeper process using Ambari Web.
Run the netstat-tuplpn command to check if the ZooKeeper server process is bound to the correct network port.
Use ping to check the network connection between the Nagios server and the ZooKeeper server.

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