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Running a node (Lighthouse/Geth) on Dencun devnet-12

Docker Compose setup for running a Lighthouse/Geth node on Dencun devnet-12. Builds docker images from Dencun devnet-12 branches of Lighthouse and Geth.

Run with Docker

docker-compose up --build

If you've previously used this repo to run earlier devnets, you'll need to remove old containers and volumes with the below command first:

docker-compose rm -v

To rebuild the image from the latest commits, run docker-compose build --no-cache, then start the containers with docker-compose up.

Configuration Options

Below are configurations that can be added to the .env file in the project directory:

# Overrides the EL P2P port, default 30303
EL_P2P_PORT=30303

# Overrides the EL log level, default: 3
EL_LOG_LEVEL=4

# Overrides the CL P2P port, default: 9000
CL_P2P_PORT=9300

# Overrides the CL log level, default: info
CL_LOG_LEVEL=debug

# Add option to checkpoint sync from a remote BN
CHECKPOINT_SYNC_URL=http://host.docker.internal:5053

How to test

Request devnet-12 eth

Request some devnet eth from one of the faucets here: https://dencun-devnet-12.ethpandaops.io/

Sending Blobs

Nethermind's SendBlobs

Nethermind's SendBlobs tool can be found here.

# Usage: docker run ghcr.io/flcl42/send-blobs:latest <rpc_url> <num_of_blobs> <private_key> <receiver-address>
# Example:
docker run ghcr.io/flcl42/send-blobs:latest http://localhost:8545 5 0x0000000000000000000000000000000000000000000000000000000000000000 0x000000000000000000000000000000000000f1c1

Blob-utils

To build blob-utils:

git clone https://github.com/Inphi/blob-utils.git
cd blob-utils
go build

# for Mac with Apple M1/M2 chips, build with these flags:
CGO_CFLAGS="-O -D__BLST_PORTABLE__" CGO_CFLAGS_ALLOW="-O -D__BLST_PORTABLE__" go build

To send a blob, replace your_private_key with your private key.

./blob-utils tx --rpc-url http://localhost:8545 \
    --blob-file <(echo hello) \
    --to 0x0000000000000000000000000000000000000000 \
    --private-key <your_private_key> \
    --gas-limit 210000 \
    --chain-id 7011893062 \
    --priority-gas-price 200000000 \
    --max-fee-per-blob-gas 300000000

Downloading a blob via Beacon API

# look up by slot
curl http://localhost:5052/eth/v1/beacon/blob_sidecars/68267 | jq .

References