Local relay chain setup

Prerequisites

First, clone the polkadot repository:

git clone https://github.com/paritytech/polkadot.git

Then, download the raw raw-local-chainspec.json chain-spec file here and put it in the root of the cloned polkadot repository.

At the time of writing this, the Pendulum parachain is using Polkadot dependencies of version v0.9.29. So for compatibility purposes, you need to check out the respective branch before building the node.

# Checkout correct branch
git checkout release-v0.9.29
# Build polkadot node
cargo build --release

Running the relay chain validators

From inside the cloned polkadot repository (after building the node):

Run relay-chain validator 1

./target/release/polkadot \
--alice \
--validator \
--base-path /tmp/relay/alice \
--chain ./raw-local-chainspec.json \
--port 30333 \
--ws-port 9944

If you ran this validator before and you would like to start afresh from genesis, then you would need to remove the folder /tmp/relay first (and similarly for the following validator and collator nodes in this tutorial).

Check the logs for the node identity of Alice (see line 4) and copy it to your clipboard

...
⏱ Loaded block-time = 6s from block 0x7035c844a493bb0324763d592fa3dec2ca68ee0d88ad0513e322e02a209e625e
👶 Creating empty BABE epoch changes on what appears to be first startup.
🏷 Local node identity is: 12D3KooWMXKd3SybDBuDC8zLbSxzjy7dSNz9gvumFbkxoUEJY4H3 # COPY THIS ID
📦 Highest known block at #0Run relay-chain validator 2
...

Run relay-chain validator 2 (with copied node ID)

./target/release/polkadot \
--bob \
--validator \
--base-path /tmp/relay/bob \
--chain ./raw-local-chainspec.json \
--bootnodes /ip4/127.0.0.1/tcp/30333/p2p/<Alice_NODE_ID> \ # REPLACE ME WITH COPIED ID
--port 30334 \
--ws-port 9945