FunctionX Node State-Sync

Our State-Sync Server Setup

Our app.toml settings related to state-sync is as follows. This is for you information only. You do not need to follow the same setup on your node.

# Prune Type
pruning = "custom"

# Prune Strategy
pruning-keep-every = 2000

# State-Sync Snapshot Strategy
snapshot-interval = 2000
snapshot-keep-recent = 5

Our state-sync RPC server for FunctionX is:

https://functionx-rpc.polkachu.com:443

Instruction

We assume that you use Cosmovisor to manage your node. If you do not use Cosmovisor, you will need to customize the following instruction slightly.

Create a reusable shell script such as state_sync.sh with the following code. The code will fetch important state-sync information (such as block height and trust hash) from our server and update your config.toml file accordingly.

#!/bin/bash

SNAP_RPC="https://functionx-rpc.polkachu.com:443"

LATEST_HEIGHT=$(curl -s $SNAP_RPC/block | jq -r .result.block.header.height); \
BLOCK_HEIGHT=$((LATEST_HEIGHT - 2000)); \
TRUST_HASH=$(curl -s "$SNAP_RPC/block?height=$BLOCK_HEIGHT" | jq -r .result.block_id.hash)

sed -i.bak -E "s|^(enable[[:space:]]+=[[:space:]]+).*$|\1true| ; \
s|^(rpc_servers[[:space:]]+=[[:space:]]+).*$|\1\"$SNAP_RPC,$SNAP_RPC\"| ; \
s|^(trust_height[[:space:]]+=[[:space:]]+).*$|\1$BLOCK_HEIGHT| ; \
s|^(trust_hash[[:space:]]+=[[:space:]]+).*$|\1\"$TRUST_HASH\"|" $HOME/.fxcore/config/config.toml

Grant user the privilege to execute script and then run the script:

chmod 700 state_sync.sh
./state_sync.sh

Stop the node:

sudo service functionx stop

Reset the node

# Reset node state
fxcored tendermint unsafe-reset-all --home $HOME/.fxcore --keep-addr-book

Restart the node:

sudo service functionx start

If everything goes well, your node should start syncing within 10 minutes.

ALTERNATIVE ROUTE: We also have FunctionX Snapshot Service to help you bootstrap a node.

Trouble-Shooting

I am not able to connect with the state-sync server

First, visit our state-sync server landing page to ensure it is not down.

Second, add Polkachu's state-sync server as your peer. You can find Polkachu's peer info here.

I am able to connect, but immediately get AppHash errors