Deploying a rollup to Avail

🌞 Introduction

Avail DA offers scalable data availability that underpins the Avail ecosystem and ensures instantaneous and reliable data integrity, enabling rollups to grow, through the use of cutting-edge zero knowledge and KZG Polynomial commitments.

This tutorial serves as a comprehensive guide for deploying your GM world rollup on Avail's data availability (DA) network.

Before proceeding, ensure that you have completed the GM World rollup setup.

Note : If you want to go through gm world setup docs for more information, you can refer GM world rollup tutorial, which covers setting up a local sovereign gm-world rollup and connecting it to a local (mock) DA node.

🪶 Running an Avail light node

Before you can start your rollup node, you need to initiate, sync, and possibly fund a light node on Turing Testnet which is the test network of Avail

• Local development
• Turing Testnet

🚀 Using Turing Testnet

• To fund your wallet address for using Turing Testnet: get AVAIL tokens from the faucet
• Paste your mnemonic in the identity.toml file by creating a identity.toml with the following command: touch identity.toml Example:

avail_secret_uri = '<paste your mnemonic here>'

Running just an Avail light node is enough for Turing testnet. Run the Avail light node using the following command

cargo run --release -- --network turing --app-id 1 --clean --identity identity.toml

If you want to sync Avail light node with your desired block number, you can add the following config in your config.yaml file from here

http_server_host = '127.0.0.1'
http_server_port = 8000
port = 38000
sync_start_block = 322264

After successfully starting a light node, it's time to start posting the batches of blocks of data that your rollup generates.

🧹 Cleaning previous chain history

From the GM world rollup tutorial, you should already have the gmd binary and the $HOME/.gm directory.

To clear old rollup data:

rm -r $(which gmd) && rm -rf $HOME/.gm

🏗️ Building your rollup

Now we need to rebuild our rollup by simply running the existing init.sh script:

cd $HOME/gm && bash init.sh

This process creates a new $HOME/.gm directory and a new gmd binary. Next, we need to connect our rollup to the running Avail light node.

🛠️ Configuring flags for DA

Now we're prepared to initiate our rollup and establish a connection with the Avail light node. The gmd start command requires two DA configuration flags:

• --rollkit.da_start_height
• --rollkit.da_address

TIP

Optionally, you could also set the --rollkit.da_block_time flag. This should be set to the finality time of the DA layer, not its actual block time, as Rollkit does not handle reorganization logic. The default value is 15 seconds.

Let's determine what to provide for each of them.

First, let's query the DA Layer start height using an RPC endpoint provided by Avail Labs. For local, it would be - https://localhost:8000/v1/latest_block, and for Turing Testnet - https://avail-turing-rpc.publicnode.com

Here is an example for the local development (replace URL for Turing Testnet if needed):

DA_BLOCK_HEIGHT=$(curl https://localhost:8000/v1/latest_block | jq -r '.result.block.header.height')
echo -e "\n Your DA_BLOCK_HEIGHT is $DA_BLOCK_HEIGHT \n"

You will see the output like this:

 Your DA_BLOCK_HEIGHT is 35

🔥 Running your rollup connected to an avail light node

Now let's run our rollup node with all DA flags:

    gmd start \
    --rollkit.aggregator \
    --rollkit.da_address="grpc://localhost:3000" \   
    --rollkit.da_start_height $DA_BLOCK_HEIGHT \
    --minimum-gas-prices="0.1stake"

Now, the rollup is running and posting blocks (aggregated in batches) to Avail. You can view your rollup by finding your account on Turing testnet

INFO

For details on configuring gas prices specifically for the DA network, see our DA Network Gas Price Guide. This is separate from the --minimum-gas-prices="0.025stake" setting, which is used for rollup network operations.

🎉 Next steps

Congratulations! You've built a local rollup that posts to Avail's testnets as well as locally. Well done! Now, go forth and build something great! Good luck!