As a cluster administrator, you can expand the available node port range. If your cluster uses of a large number of node ports, you might need to increase the number of available ports.
The default port range is 30000-32767. You can never reduce the port range, even if you first expand it beyond the default range.
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Your cluster infrastructure must allow access to the ports that you specify within the expanded range. For example, if you expand the node port range to
30000-32900, the inclusive port range of32768-32900must be allowed by your firewall or packet filtering configuration.