sui start

The sui start command starts a local Sui network. It can run in two modes: persisted state (using existing genesis) or ephemeral state (regenerated each run).

Synopsis

sui start [OPTIONS]

Options

--network.config

path

Config directory containing network configuration. If not specified and no genesis exists, a new one is auto-generated in ~/.sui/sui_config/

--force-regenesis

boolean

Create new genesis each run without persisting state. Only use when you want to start from scratch every time

--with-faucet

string

Start a faucet with specified host:port (e.g., 0.0.0.0:9123). Default: 0.0.0.0:9123 if flag is provided without value. Use --with-faucet=HOST:PORT for custom values

--with-indexer

url

Start an indexer with PostgreSQL database. Three modes:

Not specified: No indexer
--with-indexer: Temporary local database in config directory
--with-indexer=<URL>: Use provided PostgreSQL database URL. Use --with-indexer=postgres://... for custom database

--with-consistent-store

string

Start a Consistent Store at specified host:port. Default: 0.0.0.0:9124 if flag is provided. Automatically enabled when --with-graphql is set. Use --with-consistent-store=HOST:PORT for custom values

--with-graphql

string

Start a GraphQL server at specified host:port. Default: 0.0.0.0:9125 if flag is provided. Automatically enables indexer and consistent store if not already set. Use --with-graphql=HOST:PORT for custom values

--fullnode-rpc-port

u16

default:"9000"

Port to start the Fullnode RPC server on

--epoch-duration-ms

u64

Set the epoch duration in milliseconds. Can only be used with --force-regenesis or when no genesis exists. Default: 60000ms (1 minute) with --force-regenesis

--data-ingestion-dir

path

Directory to dump executed checkpoints as files. Incompatible with --no-full-node. Defaults to temporary directory if --with-indexer is set

--no-full-node

boolean

Start the network without a fullnode

--committee-size

usize

Set number of validators in the network. Only applies when generating new genesis (with --force-regenesis or no existing genesis)

Description

By default, sui start starts a local network from the genesis blob that exists in the Sui config directory. If no genesis exists, it will generate one automatically. The network includes:

Validator nodes (default: 4 validators)
Optional fullnode (default: enabled)
Optional faucet service
Optional indexer with PostgreSQL
Optional GraphQL server
Optional consistent store

Operational Modes

1. Persisted Mode (Default)

State is preserved between runs:

# First run - generates genesis
sui start

# Stop with Ctrl+C

# Second run - uses existing genesis, state persists
sui start

2. Ephemeral Mode

New genesis each run, no state persistence:

sui start --force-regenesis

With --force-regenesis, all state is lost when the network stops. Use only for testing.

3. Custom Config Directory

Use a specific network configuration:

sui start --network.config /path/to/network-config

Starting Services

Faucet

Start with a local faucet:

# Default port (9123)
sui start --with-faucet

# Custom host and port
sui start --with-faucet=127.0.0.1:5000

# Custom port, all interfaces
sui start --with-faucet=0.0.0.0:5000

Faucet endpoints:

# Request tokens
curl -X POST http://127.0.0.1:9123/gas \
  -H 'Content-Type: application/json' \
  -d '{"FixedAmountRequest": {"recipient": "0xADDRESS"}}'

# Or via CLI
sui client faucet --url http://127.0.0.1:9123

Default faucet amount: 200 SUI (200,000,000,000 MIST)

Indexer

Start with an indexer:

# Temporary local database
sui start --with-indexer

# External PostgreSQL database
sui start --with-indexer=postgres://user:pass@localhost:5432/sui_indexer

Indexer requires PostgreSQL. The local database option automatically manages a temporary PostgreSQL instance.

GraphQL Server

Start with GraphQL API:

# Default port (9125), auto-enables indexer and consistent store
sui start --with-graphql

# Custom host and port
sui start --with-graphql=0.0.0.0:8080

# With custom indexer database
sui start \
  --with-graphql \
  --with-indexer=postgres://user:pass@localhost/sui

GraphQL endpoint: http://127.0.0.1:9125/graphql GraphQL IDE: http://127.0.0.1:9125 (if not disabled)

Consistent Store

Start with consistent state storage:

# Default port (9124)
sui start --with-consistent-store

# Custom host and port
sui start --with-consistent-store=127.0.0.1:8000

Endpoint: http://127.0.0.1:9124

Full Stack Local Development

Start all services for complete local development:

sui start \
  --with-faucet \
  --with-indexer \
  --with-graphql \
  --epoch-duration-ms 30000

This provides:

RPC: http://127.0.0.1:9000
Faucet: http://127.0.0.1:9123
GraphQL: http://127.0.0.1:9125
Consistent Store: http://127.0.0.1:9124
Epoch Duration: 30 seconds

Network Configuration

Default Setup

When sui start runs without existing genesis:

Validators: 4 validators (or --committee-size value)
Fullnode: 1 fullnode on port 9000
Epoch Duration: 60 seconds with --force-regenesis
Config Directory: ~/.sui/sui_config/

Custom Validators

# 7-validator network
sui start --force-regenesis --committee-size 7

Custom Epoch Duration

# 5-minute epochs
sui start --force-regenesis --epoch-duration-ms 300000

# 1-hour epochs
sui start --epoch-duration-ms 3600000

Epoch duration can only be set when generating new genesis (--force-regenesis) or when no genesis exists.

No Fullnode Mode

Run only validators without fullnode:

sui start --no-full-node

Without a fullnode, you cannot:

Submit transactions via RPC
Query chain state
Run indexer or GraphQL

Data Ingestion

Capture checkpoint data to files:

sui start --data-ingestion-dir ./checkpoints

Checkpoint files are written to the specified directory for analysis or replay.

Protocol Config Overrides

Override protocol parameters for local testing:

# Enable overrides
export SUI_PROTOCOL_CONFIG_OVERRIDE_ENABLE=1

# Set specific parameters
export SUI_PROTOCOL_CONFIG_OVERRIDE_min_checkpoint_interval_ms=1000
export SUI_PROTOCOL_CONFIG_OVERRIDE_max_transactions_per_checkpoint=10000

# Start network
sui start --force-regenesis

Protocol config must match across all nodes. Changing these values outside local networks is dangerous and may break the network.

Connecting Clients

After starting the network, configure clients to connect:

# Add local network environment
sui client new-env --alias local --rpc http://127.0.0.1:9000

# Switch to local network
sui client switch --env local

# Verify connection
sui client active-env
sui client chain-identifier

Workflow Examples

Quick Testing

# Start ephemeral network with faucet
sui start --force-regenesis --with-faucet

# In another terminal
sui client switch --env local
sui client faucet
sui client balance

# Test your dapp...

# Stop with Ctrl+C - all state is lost

Persistent Development

# First time - generates genesis
sui start --with-faucet --epoch-duration-ms 60000

# Stop with Ctrl+C

# Later - state persists
sui start --with-faucet

# Same objects, accounts, and state remain

Full Development Stack

# Start complete stack
sui start \
  --with-faucet \
  --with-indexer \
  --with-graphql \
  --epoch-duration-ms 30000 \
  --committee-size 4

# Configure client
sui client new-env --alias devnet-local --rpc http://127.0.0.1:9000
sui client switch --env devnet-local

# Request tokens
sui client faucet

# Query via GraphQL
curl http://127.0.0.1:9125/graphql -H 'Content-Type: application/json' -d '{
  "query": "{ chainIdentifier }"
}'

Multi-Validator Testing

# Create 7-validator network with fast epochs
sui start \
  --force-regenesis \
  --committee-size 7 \
  --epoch-duration-ms 30000 \
  --with-faucet

# Test validator behavior, epoch transitions, etc.

Health Monitoring

The network runs a health check loop:

Interval: Every 3 seconds
Unhealthy threshold: 3 consecutive failures
Auto-shutdown: On persistent health check failures

Monitor logs for:

INFO sui::start: Cluster started
INFO sui::start: Fullnode RPC URL: http://127.0.0.1:9000

Stopping the Network

Gracefully stop the network:

# Press Ctrl+C
^C
INFO sui::start: Received Ctrl+C, shutting down...
INFO sui::start: Shutting down RPC services...

Force kill (not recommended):

# If Ctrl+C doesn't work
kill -9 $(pgrep sui)

Port Usage

Default ports used by sui start:

Service	Default Port	Flag
Fullnode RPC	9000	`--fullnode-rpc-port`
Faucet	9123	`--with-faucet`
Consistent Store	9124	`--with-consistent-store`
GraphQL	9125	`--with-graphql`
Validator 0	8080+	(in network config)

Ensure these ports are available before starting.

Troubleshooting

Port Already in Use

Error: Address already in use Solution:

# Use different ports
sui start \
  --fullnode-rpc-port 9001 \
  --with-faucet=0.0.0.0:9124 \
  --with-graphql=0.0.0.0:9126

# Or kill existing process
lsof -ti:9000 | xargs kill

Genesis Conflict

Error: Cannot use --epoch-duration-ms with existing genesis Solution:

# Either use --force-regenesis
sui start --force-regenesis --epoch-duration-ms 120000

# Or delete existing genesis
rm -rf ~/.sui/sui_config/
sui start --epoch-duration-ms 120000

PostgreSQL Issues

Error: Failed to start indexer Solution:

# Check PostgreSQL is installed (for external DB)
psql --version

# Use temporary local database
sui start --with-indexer  # No URL parameter

# Or provide correct database URL
sui start --with-indexer=postgres://localhost/sui_indexer

Network Won’t Start

Error: Validators fail health checks Solution:

# Check logs for specific errors
RUST_LOG=debug sui start --force-regenesis

# Clear all state and try again
rm -rf ~/.sui/sui_config/
sui start

Faucet Not Working

Error: Faucet requests fail Solution:

# Verify faucet is running
curl http://127.0.0.1:9123/health

# Check faucet has funds (persisted mode)
sui client balance --address <FAUCET_ADDRESS>

# Or restart with --force-regenesis to get fresh faucet
sui start --force-regenesis --with-faucet

Advanced Configuration

Using Pre-Generated Genesis

# Generate genesis separately
sui genesis --working-dir ./my-network --with-faucet

# Start using that genesis
sui start --network.config ./my-network --with-faucet

External PostgreSQL for Indexer

# Set up database
createdb sui_indexer
psql sui_indexer -c 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp"'

# Start with indexer
sui start \
  --with-indexer=postgres://localhost/sui_indexer \
  --with-graphql

Development with Auto-Restart

Use watchexec or similar tools:

# Install watchexec
cargo install watchexec-cli

# Auto-restart on source changes
watchexec -r -e rs,toml -- sui start --force-regenesis

Performance Tuning

For faster local testing:

sui start \
  --force-regenesis \
  --committee-size 1 \
  --epoch-duration-ms 10000

For production-like testing:

sui start \
  --committee-size 7 \
  --epoch-duration-ms 86400000 \
  --with-indexer \
  --with-graphql

Overview

Commands

​Synopsis

​Options

​Description

​Operational Modes

​1. Persisted Mode (Default)

​2. Ephemeral Mode

​3. Custom Config Directory

​Starting Services

​Faucet

​Indexer

​GraphQL Server

​Consistent Store

​Full Stack Local Development

​Network Configuration

​Default Setup

​Custom Validators

​Custom Epoch Duration

​No Fullnode Mode

​Data Ingestion

​Protocol Config Overrides

​Connecting Clients

​Workflow Examples

​Quick Testing

​Persistent Development

​Full Development Stack

​Multi-Validator Testing

​Health Monitoring

​Stopping the Network

​Port Usage

​Troubleshooting

​Port Already in Use

​Genesis Conflict

​PostgreSQL Issues

​Network Won’t Start

​Faucet Not Working

​Advanced Configuration

​Using Pre-Generated Genesis

​External PostgreSQL for Indexer

​Development with Auto-Restart

​Performance Tuning

​See Also

Build docs developers (and LLMs) love

Synopsis

Options

Description

Operational Modes

1. Persisted Mode (Default)

2. Ephemeral Mode

3. Custom Config Directory

Starting Services

Faucet

Indexer

GraphQL Server

Consistent Store

Full Stack Local Development

Network Configuration

Default Setup

Custom Validators

Custom Epoch Duration

No Fullnode Mode

Data Ingestion

Protocol Config Overrides

Connecting Clients

Workflow Examples

Quick Testing

Persistent Development

Full Development Stack

Multi-Validator Testing

Health Monitoring

Stopping the Network

Port Usage

Troubleshooting

Port Already in Use

Genesis Conflict

PostgreSQL Issues

Network Won’t Start

Faucet Not Working

Advanced Configuration

Using Pre-Generated Genesis

External PostgreSQL for Indexer

Development with Auto-Restart

Performance Tuning

See Also