How to get PeerID or local node identity in bash script to enable running other node using it as bootnode in a command in script?

Question

I want to write a script that runs node01, node02, node03 in relay chain network setup.

How do I get local node identity generated from running node 01? Also I am confused on how the first validator node decides the order to use keys from chain-spec. Chain is either substrate/polkadot/rococo-local

./target/release/polkadot \
--base-path /data/node01 \
--chain ./customSpecRaw.json \
--port 30333 \
--ws-port 9944 \
--rpc-port 9933 \
--no-telemetry \
--validator \
--rpc-methods Unsafe \  

var local_id = ??
echo "Run node02"

./target/release/polkadot  --base-path /data/node02   --chain ./customSpecRaw.json   --port 30334   --ws-external --ws-port 9945   --rpc-external --rpc-port 9934 --rpc-cors all  --no-telemetry --validator   --rpc-methods Unsafe --name MyNode02   --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/$local_id

Please help me in writing a script that uses node1's peerID to run other validator nodes

Answer 1

You can boot your node with:

--node-key 0000000000000000000000000000000000000000000000000000000000000000

Then copy the id from your terminal and paste/hardcode it into your script. Because you specify a node key, it won't change.

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If you don't want to use 00.. as your node key. You can generate yours from subkey. And use it while booting your node.

subkey generate-node-key --file node-key

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Or you could specify the --node-key-file xxx. If xxx doesn't exist, then the node will create it for you. And use the curl http://127.0.0.1:9933 -X POST -H "Content-Type:application/json" -d '{"jsonrpc":"2.0","method":"system_localPeerId","params":[],"id":1}' to get the peer id, then use it.