Consensus node ​

This guide covers how to set up a consensus node on Celestia. Consensus nodes allow you to sync the entire blockchain history in the Celestia consensus layer.

Minimum hardware requirements ​

The following minimum hardware requirements are recommended for running a consensus node:

• Memory: 16 GB RAM
• CPU: Quad-Core
• Disk: 2 TB SSD Storage
• Bandwidth: 1 Gbps for Download/1 Gbps for Upload

Set up a consensus node ​

The following tutorial is done on an Ubuntu Linux 20.04 (LTS) x64 instance machine.

Set up the dependencies ​

Follow the instructions on installing dependencies.

Install celestia-app ​

Follow the tutorial on installing celestia-app.

Set up the P2P networks ​

To initialize the network, pick a "node-name" that describes your node. Keep in mind that this might change if a new testnet is deployed.

celestia-appd init "node-name" --chain-id celestia

celestia-appd init "node-name" --chain-id celestia

celestia-appd init "node-name" --chain-id mocha-4

celestia-appd init "node-name" --chain-id mocha-4

celestia-appd init "node-name" --chain-id arabica-11

celestia-appd init "node-name" --chain-id arabica-11

Download the genesis.json file:

celestia-appd download-genesis celestia

celestia-appd download-genesis celestia

celestia-appd download-genesis mocha-4

celestia-appd download-genesis mocha-4

celestia-appd download-genesis arabica-11

celestia-appd download-genesis arabica-11

Set seeds in the $HOME/.celestia-app/config/config.toml file:

SEEDS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/celestia/seeds.txt | tr '\n' ',')
echo $SEEDS
sed -i.bak -e "s/^seeds *=.*/seeds = \"$SEEDS\"/" $HOME/.celestia-app/config/config.toml

SEEDS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/celestia/seeds.txt | tr '\n' ',')
echo $SEEDS
sed -i.bak -e "s/^seeds *=.*/seeds = \"$SEEDS\"/" $HOME/.celestia-app/config/config.toml

SEEDS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/mocha-4/seeds.txt | tr '\n' ',')
echo $SEEDS
sed -i.bak -e "s/^seeds *=.*/seeds = \"$SEEDS\"/" $HOME/.celestia-app/config/config.toml

SEEDS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/mocha-4/seeds.txt | tr '\n' ',')
echo $SEEDS
sed -i.bak -e "s/^seeds *=.*/seeds = \"$SEEDS\"/" $HOME/.celestia-app/config/config.toml

# For Arabica, you can set seeds manually in the
# `$HOME/.celestia-app/config/config.toml` file:
# Comma separated list of seed nodes to connect to
seeds = ""

# For Arabica, you can set seeds manually in the
# `$HOME/.celestia-app/config/config.toml` file:
# Comma separated list of seed nodes to connect to
seeds = ""

PERSISTENT_PEERS=$(curl -s https://raw.githubusercontent.com/cosmos/chain-registry/master/celestia/chain.json | jq -r '.peers.persistent_peers[].address' | tr '\n' ',' | sed 's/,$/\n/')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

PERSISTENT_PEERS=$(curl -s https://raw.githubusercontent.com/cosmos/chain-registry/master/celestia/chain.json | jq -r '.peers.persistent_peers[].address' | tr '\n' ',' | sed 's/,$/\n/')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

PERSISTENT_PEERS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/mocha-4/peers.txt | tr '\n' ',')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

PERSISTENT_PEERS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/mocha-4/peers.txt | tr '\n' ',')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

PERSISTENT_PEERS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/arabica-11/peers.txt | tr '\n' ',')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

PERSISTENT_PEERS=$(curl -sL https://raw.githubusercontent.com/celestiaorg/networks/master/arabica-11/peers.txt | tr '\n' ',')
echo $PERSISTENT_PEERS
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$PERSISTENT_PEERS\"/" $HOME/.celestia-app/config/config.toml

Storage and pruning configurations ​

Optional: Connect a consensus node to a bridge node ​

If your consensus node is being connected to a celestia-node bridge node, you will need to enable transaction indexing and retain all block data. This can be achieved with the following settings in your config.toml.

Enable transaction indexing ​

indexer = "kv"

indexer = "kv"

Retain all block data ​

And in your app.toml, min-retain-blocks should remain as the default setting of 0:

min-retain-blocks = 0 # retain all block data, this is default setting

min-retain-blocks = 0 # retain all block data, this is default setting

Query transactions by hash ​

To query transactions using their hash, transaction indexing must be turned on. Set the indexer to "kv" in your config.toml:

indexer = "kv"

indexer = "kv"

Optional: Access historical state ​

If you want to query the historical state — for example, you might want to know the balance of a Celestia wallet at a given height in the past — you should run an archive node with pruning = "nothing" in your app.toml. Note that this configuration is resource-intensive and will require significant storage:

pruning = "nothing"

pruning = "nothing"

Save on storage requirements ​

If you want to save on storage requirements, consider using pruning = "everything" in your app.toml to prune everything. If you select "everything" or "default", but still want to keep the block data, you can do so by not changing the default value of min-retain-blocks = 0 in your app.toml. A value of 0 for min-retain-blocks will keep all block data. This will prune snapshots of the state, but it will keep block data:

pruning = "everything"
min-retain-blocks = 0 # this is the default setting

pruning = "everything"
min-retain-blocks = 0 # this is the default setting

Sync types ​

Option 1: Block sync ​

By default, a consensus node will sync using block sync; which will request, validate and execute every block up to the head of the blockchain. This is the most secure mechanism yet the slowest (taking up to weeks depending on the height of the blockchain).

There are two alternatives for quicker syncing.

Option 2: State sync ​

State sync uses light client verification to verify state snapshots from peers and then apply them. State sync relies on weak subjectivity; a trusted header (specifically the hash and height) must be provided. This can be found by querying a trusted RPC endpoint (/block). RPC endpoints are also required for retrieving light blocks. These can be found in the docs here under the respective networks or from the chain-registry.

In $HOME/.celestia-app/config/config.toml, set

rpc_servers = ""
trust_height = 0
trust_hash = ""

rpc_servers = ""
trust_height = 0
trust_hash = ""

And also set statesync to true:

#######################################################
###         State Sync Configuration Options        ###
#######################################################
[statesync]
enable = true

#######################################################
###         State Sync Configuration Options        ###
#######################################################
[statesync]
enable = true

To their respective fields. At least two different rpc endpoints should be provided. The more, the greater the chance of detecting any fraudulent behavior.

Once setup, you should be ready to start the node as normal. In the logs, you should see: Discovering snapshots. This may take a few minutes before snapshots are found depending on the network topology.

Option 3: Quick sync ​

Quick sync effectively downloads the entire data directory from a third-party provider meaning the node has all the application and blockchain state as the node it was copied from.

Run the following command to quick-sync from a snapshot:

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">celestia.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">celestia.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">mocha-4.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">mocha-4.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">arabica-11.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

cd $HOME
rm -rf ~/.celestia-app/data
mkdir -p ~/.celestia-app/data
SNAP_NAME=$(curl -s https://snaps.qubelabs.io/celestia/ | \
    egrep -o ">arabica-11.*tar" | tr -d ">")
aria2c -x 16 -s 16 -o celestia-snap.tar "https://snaps.qubelabs.io/celestia/${SNAP_NAME}"
tar xf celestia-snap.tar -C ~/.celestia-app/data/

Start the consensus node ​

If you are running celestia-app v1.x.x:

celestia-appd start

celestia-appd start

If you are running celestia-app >= v2.0.0: then you'll want to start the node with a --v2-upgrade-height that is dependent on the network. The --v2-upgrade-height flag is only needed during the v2 upgrade height so after your node has executed the upgrade (e.g. you see the log upgraded from app version 1 to 2), you don't need to provide this flag for future celestia-appd start invocations.

celestia-appd start --v2-upgrade-height 2371495

celestia-appd start --v2-upgrade-height 2371495

celestia-appd start --v2-upgrade-height 2585031

celestia-appd start --v2-upgrade-height 2585031

celestia-appd start --v2-upgrade-height 1751707

celestia-appd start --v2-upgrade-height 1751707

Optional: If you would like celestia-app to run as a background process, you can follow the SystemD tutorial.

Extra resources for consensus nodes ​

Optional: Reset network ​

This will delete all data folders so we can start fresh:

celestia-appd tendermint unsafe-reset-all --home $HOME/.celestia-app

celestia-appd tendermint unsafe-reset-all --home $HOME/.celestia-app

Optional: Configure an RPC endpoint ​

You can configure your consensus node to be a public RPC endpoint. This allows it to accept connections from data availability nodes and serve requests for the data availability API.

Expose RPC ​

By default, the RPC service listens on localhost which means it can't be accessed from other machines. To make the RPC service available publicly, you need to bind it to a public IP or 0.0.0.0 (which means listening on all available network interfaces).

You can do this by editing the config.toml file:

sed -i 's#"tcp://127.0.0.1:26657"#"tcp://0.0.0.0:26657"#g' ~/.celestia-app/config/config.toml

sed -i 's#"tcp://127.0.0.1:26657"#"tcp://0.0.0.0:26657"#g' ~/.celestia-app/config/config.toml

This command replaces the localhost IP address with 0.0.0.0, making the RPC service listen on all available network interfaces.

Note on external-address ​

The external-address field in the configuration is used when your node is behind a NAT and you need to advertise a different address for peers to dial. Populating this field is not necessary for making the RPC endpoint public.

EXTERNAL-ADDRESS=$(wget -qO- eth0.me)
sed -i.bak -e "s/^external-address = ""/external-address = "$EXTERNAL-ADDRESS:26656"/" \
    $HOME/.celestia-app/config/config.toml

EXTERNAL-ADDRESS=$(wget -qO- eth0.me)
sed -i.bak -e "s/^external-address = ""/external-address = "$EXTERNAL-ADDRESS:26656"/" \
    $HOME/.celestia-app/config/config.toml

Restart the node ​

After making these changes, restart celestia-appd to load the new configurations.

Optional: Transaction indexer configuration options ​

This section guides you on how to configure your config.toml file in celestia-app to select which transactions to index. Depending on the application's configuration, a node operator may decide which transactions to index.

The available options are:

1. null: This option disables indexing. If you don't need to query transactions, you can choose this option to save space.
2. kv (default): This is the simplest indexer, backed by key-value storage (defaults to levelDB; see DBBackend). When kv is chosen, tx.height and tx.hash will always be indexed. This option is suitable for basic queries on transactions.
3. psql: This indexer is backed by PostgreSQL. When psql is chosen, tx.height and tx.hash will always be indexed. This option is suitable for complex queries on transactions.

An example to set the value to kv in config.toml is:

indexer = "kv"

indexer = "kv"

Remember to restart celestia-appd after making changes to the configuration to load the new settings.

Optional: Discard ABCI responses configuration ​

This section will guide you on how to configure your config.toml file in celestia-app to manage the storage of ABCI responses. ABCI responses are the results of executing transactions and are used for /block_results RPC queries and to reindex events in the command-line tool.

The discard_abci_responses option allows you to control whether these responses are persisted in the state store:

• false (default): ABCI responses are stored in the state store. This ensures that ABCI responses are available for /block_results RPC queries and for reindexing events. However, it can consume a significant amount of disk space.
• true: ABCI responses are not stored in the state store. This can save a considerable amount of disk space, but /block_results RPC queries and event reindexing will not be available.

An example to set the value to false in config.toml is:

discard_abci_responses = false

discard_abci_responses = false

Remember to restart celestia-appd after making changes to the configuration to load the new settings.

FAQ ​

+2/3 committed an invalid block: wrong Block.Header.Version ​

If you encounter an error like:

2024-04-25 14:48:24 6:48PM ERR CONSENSUS FAILURE!!! err="+2/3 committed an invalid block: wrong Block.Header.Version. Expected {11 1}, got {11 2}" module=consensus stack="goroutine 214 [running]:\nruntime/debug.Stack()\n\t/usr/local/go/src/runtime/debug/stack.go:24 +0x64\ngithub.com/tendermint/tendermint/consensus.(*State).receiveRoutine.func2()\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:746 +0x44\npanic({0x1b91180?, 0x400153b240?})\n\t/usr/local/go/src/runtime/panic.go:770 +0x124\ngithub.com/tendermint/tendermint/consensus.(*State).finalizeCommit(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:1637 +0xd30\ngithub.com/tendermint/tendermint/consensus.(*State).tryFinalizeCommit(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:1606 +0x26c\ngithub.com/tendermint/tendermint/consensus.(*State).handleCompleteProposal(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:2001 +0x2d8\ngithub.com/tendermint/tendermint/consensus.(*State).handleMsg(0x400065ea88, {{0x2b30a00, 0x400143e048}, {0x40002a61b0, 0x28}})\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:856 +0x1c8\ngithub.com/tendermint/tendermint/consensus.(*State).receiveRoutine(0x400065ea88, 0x0)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:782 +0x2c4\ncreated by github.com/tendermint/tendermint/consensus.(*State).OnStart in goroutine 169\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:391 +0x110\n"

2024-04-25 14:48:24 6:48PM ERR CONSENSUS FAILURE!!! err="+2/3 committed an invalid block: wrong Block.Header.Version. Expected {11 1}, got {11 2}" module=consensus stack="goroutine 214 [running]:\nruntime/debug.Stack()\n\t/usr/local/go/src/runtime/debug/stack.go:24 +0x64\ngithub.com/tendermint/tendermint/consensus.(*State).receiveRoutine.func2()\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:746 +0x44\npanic({0x1b91180?, 0x400153b240?})\n\t/usr/local/go/src/runtime/panic.go:770 +0x124\ngithub.com/tendermint/tendermint/consensus.(*State).finalizeCommit(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:1637 +0xd30\ngithub.com/tendermint/tendermint/consensus.(*State).tryFinalizeCommit(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:1606 +0x26c\ngithub.com/tendermint/tendermint/consensus.(*State).handleCompleteProposal(0x400065ea88, 0x3)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:2001 +0x2d8\ngithub.com/tendermint/tendermint/consensus.(*State).handleMsg(0x400065ea88, {{0x2b30a00, 0x400143e048}, {0x40002a61b0, 0x28}})\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:856 +0x1c8\ngithub.com/tendermint/tendermint/consensus.(*State).receiveRoutine(0x400065ea88, 0x0)\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:782 +0x2c4\ncreated by github.com/tendermint/tendermint/consensus.(*State).OnStart in goroutine 169\n\t/go/pkg/mod/github.com/celestiaorg/[email protected]/consensus/state.go:391 +0x110\n"

then it is likely that the network has upgraded to a new app version but your consensus node was not prepared for the upgrade. To fix this, you'll need to:

1. Remove DBs from your CELESTIA_HOME directory via: celestia-appd tendermint reset-state.
2. Remove the data/application.db inside your CELESTIA_HOME directory.
3. Download the latest binary for your network.
4. Restart your consensus node with the relevant --v2-upgrade-height for the network you're running on.