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Our State Sync server setup

State Sync allows a new node to join the network by fetching a snapshot of the application state at a recent height instead of fetching and replaying all historical blocks. Since the application state is generally much smaller than the blocks, and restoring it is much faster than replaying blocks, this can reduce the time to sync with the network from days to minutes.
Our `app.toml` settings related to state-sync is as follows 
# 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 
https://celestia-rpc.tienthuattoan.com

Stop the service and reset the data

sudo systemctl stop celestia-appd
cp $HOME/.celestia-app/data/priv_validator_state.json $HOME/.celestia-app/priv_validator_state.json.backup
celestia-appd tendermint unsafe-reset-all --keep-addr-book --home $HOME/.celestia-app
Get and configure the state sync information 
SNAP_RPC="https://celestia-rpc.tienthuattoan.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/.celestia-app/config/config.toml
  
mv $HOME/.celestia-app/priv_validator_state.json.backup $HOME/.celestia-app/data/priv_validator_state.json

Restart the service

sudo systemctl restart celestia-appd
sudo journalctl -u celestia-appd -f