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After searching for a while, didn’t find any post regarding this.

I know running node for testnet and mainnet use different configuring files, and on the cardano developer portal, they are showing the same port. But can I run both testnet and mainnet relay node on background (I assume I’d need to change the port number)? Do I need to make two different cardano-run process?

In that case, it is ok when I run cardano-cli commands just change different network, like testnet-magic ***/–mainnet? Is the rest command the same? I currently run the testnet as a systemd service, I can definitely just go ahead and run a mainnet node as another service on the background, but I want to ask before head, in case I would messed up the configurations on my server.

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Yes, you would need two separate cardano-node processes, each with their own configuration and their own disk storage directory.

When using cardano-cli you will need to connect to the correct local domain socket for the network you want to connect to.

Eg for mainnet:

export CARDANO_NODE_SOCKET_PATH=/path/to/mainnet/db/node.socket
cardano-cli ....

or for testnet:

export CARDANO_NODE_SOCKET_PATH=/path/to/testnet/db/node.socket
cardano-cli ....
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  • Thanks for your answer! If I do that, every time I switch between testnet and mainnet, I need to update this socket variable CARDANO_NODE_SOCKET_PATH, it there a way that it can be done automatically? I see some others suggest use two different linux accounts, it's essentially the same as changing this socket environment variable to me.
    – Cyrus
    Commented Apr 22, 2022 at 13:48
  • You can write two trivial bash scripts, with -mainnet and -testnet in the names and setting the CARDANO_NODE_SOCKET_PATH.
    – Erik de Castro Lopo
    Commented Apr 23, 2022 at 4:03

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