Running A Performant Sei Node (RPC)

In this guide, we’ll explore how to run an RPC node on Sei.

Sei is the fastest Layer-1 blockchain with its quick finality and short block times (clocking in at ~400ms). For those same reasons, a good hardware setup is crucial for running a performant node.​

In this specific guide, we’re considering Sei’s unique features and specifically configuring an RPC node in a performance-optimized way to maximize the efficiency of your hardware.

We will deviate from standard Cosmos SDK/Tendermint node setup guides in the following ways:​

• Configure the machine with RAID 0
• Build the Sei binary with support for seiDB as the backend database
• Tune system-level settings using tuned-adm

Selecting a Server

​Before you can get started, you must order a server from a hosting provider or use your own hardware. We recommend bare-metal, i.e., an isolated server with no virtualization. Some typical providers include:​

• Vultr
• OVH
• Hetzner
• Mevspace

The minimum recommended specs are:​

​Next, you will need to configure your disks with RAID 0. RAID 0, also known as striping, improves performance by splitting data across two or more disks, allowing for parallel read/write operations, which can significantly speed up data access times. Some providers offer this configuration option at the time of ordering; with others, you will need to do so manually once your server is provided. Here are sample procedures for OVH Cloud and Hetzner.​

Lastly, this guide assumes that you are installing Ubuntu as the operating system, preferably the latest LTS release, 22.04. ​

Installing Prerequisites

You will need the following:

• jq
• go
• build-essential
• curl
• wget

First, update repositories and upgrade packages:

sudo apt update && sudo apt upgrade

​Install pre-requisites:

sudo apt install jq build-essential tree curl wget

​Install go 1.21.1:

sudo rm -rf /usr/local/go sudo curl -Ls https://go.dev/dl/go1.21.1.linux-amd64.tar.gz | sudo tar -C /usr/local -xz
echo "" >> $HOME/.profile
echo 'export GOPATH=$HOME/go' >> $HOME/.profile 
echo 'export GOBIN=$GOPATH/bin' >> $HOME/.profile
echo 'export PATH=$PATH:/usr/local/go/bin:$GOBIN' >> $HOME/.profile 
source $HOME/.profile`

​Confirm installation:​

go version

​The output should indicate Go 1.21.1 is installed successfully.

Installing Sei​

1. Building the Binary

​Now that your server has been provisioned and prerequisites are installed, we can proceed to install Sei.​

First, clone the Sei GitHub repository:​

git -C $HOME clone https://github.com/sei-protocol/sei-chain

​cd into it and check out the release currently in use by the Pacific-1 mainnet:

cd $HOME/sei-chain
release=$(curl -s https://chains.cosmos.directory/sei | jq -r '.chain.codebase.recommended_version')
git checkout $release

​Finally, install the seid binary to your $HOME/go/bin/ directory:

​Confirm the installation:

seid version --long | head

​You should see output similar to the below:

name: sei
server_name: <appd>
version: xxxxxxxxxxxxxxxxxx
commit: xxxxxxxxxxxxxxxxxxxx
build_tags: netgo ledger,
go: go version go1.21.1 linux/amd64

​2. Initialise Sei

Now it’s time to initialize a home directory for Sei. The home directory is where configuration files, databases, and any key materials will be stored.​

seid init <node_moniker> --chain-id=pacific-1

​This will create a directory structure similar to:

.sei
├── config
│   ├── app.toml
│   ├── client.toml
│   ├── config.toml
│   ├── genesis.json
│   ├── node_key.json
│   └── priv_validator_key.json
└── data
    └── priv_validator_state.json
└── wasm
    └── wasm

​To verify:

tree $HOME/.sei

3. Preparing Configurations

Now, we need to retrieve the correct genesis.json file of the mainnet (chain-id: pacific-1); this is the initial configuration file for the chain and includes parameters such as initial validators and balances, chain-id, and other network-level parameters. It’s essentially the “genesis block” of the chain.​

To do so:​

wget -O $HOME/.sei/config/genesis.json https://raw.githubusercontent.com/sei-protocol/testnet/main/pacific-1/genesis.json

Enable sei-db:

sed -i 's/^sc-enable[[:space:]]*=.*$/sc-enable = true/; s/^ss-enable[[:space:]]*=.*$/ss-enable = true/' $HOME/.sei/config/app.toml

​Depending on your specific use case, you may wish to turn transaction indexing off. Transaction indexing is a feature that enables users of the RPC to query transactions based on tags, which is beneficial for applications requiring transaction search capabilities. However, it increases storage and resource usage. Validator nodes, for example, do not need this, but it is often necessary for various applications.​

Consider your specific use case and whether you want to turn transaction indexing off; the default is ON.

If you choose to disable it:

sed -i 's/indexer = \["kv"\]/indexer = ["null"]/g' $HOME/.sei/config/config.toml

​4. Installing Systemd Service

​Finally, we will use systemd as a process manager for Sei. It will be responsible for starting, stopping, and restarting it in case of failures.

Copy and paste the following into your terminal:​

cat << EOF | sudo tee /etc/systemd/system/test.service
[Unit]
Description=Sei Daemon (cosmovisor)
After=network-online.target
​
[Service]
User=$USER
ExecStart=$HOME/go/bin/seid start --home $HOME/.sei
Restart=on-failure
RestartSec=3
LimitNOFILE=infinity
​
[Install]
WantedBy=multi-user.target
EOF

​Verify the systemd unit:

cat /etc/systemd/system/seid.service

​The output should look like this:

[Unit]
Description=Sei Daemon
After=network-online.target
​
[Service]
User=<your_user>
ExecStart=<your_user_home>/go/bin/seid start -home /home/ubuntu/.sei
Restart=on-failure
RestartSec=3
LimitNOFILE=infinity
[Install]
​
WantedBy=multi-user.target

​System-Level Performance Tuning

​Once you’ve selected your server and successfully installed Sei we will use the tuned-adm package to fine-tune kernel-level configurations. tuned-adm is a system tuning daemon for Linux that can modify system settings to achieve better performance. It has several pre-built tuning models; we find the ‘throughput-performance’ profile to be the most effective. First, install tuned-adm and required packages:​

sudo apt install tuned tuned-utils tuned-utils-systemtap

​Adjust the existing throughput-performance profile to decrease the likelihood of moving memory to swap:​

sudo sed -i 's/^vm\.swappiness=10$/vm.swappiness=1/' /usr/lib/tuned/throughput-performance/tuned.conf

​Enable the profile:

sudo tuned-adm profile throughput-performance

​Verify that the profile is now active:​

tuned-adm active

​Syncing Sei and Starting the Service

​Finally, we’re ready to start the Sei node!

We’ll use the state-sync feature to fetch a recent snapshot from a peer on the network, allowing us to quickly catch up to the chain head. state-sync operates by querying peers for any snapshots taken within a certain time frame, then downloading one for bootstrapping.​

First, we need to define a trusted height, which is a delimiter, after which block we consider snapshots trusted and acceptable for downloading:

peers_stateSync=94b63fddfc78230f51aeb7ac34b9fb86bd042a77@sei-state-sync.p2p.brocha.in:30615,20e1000e88125698264454a884812746c2eb4807@seeds.lavenderfive.com:11956

​Then modify the $HOME/.sei/config.toml file to reflect this, and enable statesync:

sed -i.bak -e "s|^enable *=.*|enable = true|" $HOME/.sei/config/config.toml
sed -i.bak -e "s|^use-p2p *=.*|use-p2p = true|" $HOME/.sei/config/config.toml
sed -i.bak -e "s|^trust-height *=.*|trust-height = $trusted_height|" $HOME/.sei/config/config.toml
sed -i.bak -e "s|^trust-hash *=.*|trust-hash = \"$trusted_hash\"|" $HOME/.sei/config/config.toml
sed -i.bak -e "s|^bootstrap-peers *=.*|bootstrap-peers = \"$peers_stateSync\"|" $HOME/.sei/config/config.toml

​Start your node and observe logs:​

sudo systemctl daemon-reload
sudo systemctl start seid && journalctl -fu seid -o cat

​Occasionally, state-sync can fail. If you’re not finding any snapshots or experiencing errors otherwise, you can retry:​

cd $HOME/.sei/data
sudo systemctl stop seid
rm -rf application.db cs.wal snapshots blockstore.db evidence.db state.db ../wasm
sudo systemctl start seid && journalctl -fu seid -o cat

​Congrats! You’re now running your very own Sei RPC.

DISCLAIMER: This is not financial advice. Staking, delegation, and cryptocurrencies involve a high degree of risk, and there is always the possibility of loss, including the failure of all staked digital assets. Additionally, delegators are at risk of slashing in case of security or liveness faults on some protocols. We advise you to do your due diligence before choosing a validator.