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I'm currently running a bitcoin full node and would like to run the omni full node as well separately. I want to have 2 different datadir and I guess I need the omni full node to use a different port (from 8333) but i'm not sure which one to choose? Is there some rules for port?
What about the 8332 port for RPC communications. Do I need to change it for omni also?
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You can specify the rpcport in your bitcoin.conf. You should only need to change it for either Bitcoin or Omni, not for both.
As for selecting a port number, it's largely arbitrary. Just make sure it's not being used by another program on the machine. Additionally, if you choose a port below <= 1024, you will need super user access to run the program, so I would suggest picking something higher.
