Sync with state-sync
Instructions for joining Juno networks with statesync
State-sync is a module built into the Cosmos SDK to allow validators to rapidly join the network by syncing your node with a snapshot enabled RPC from a trusted block height.
This greatly reduces the time required for a validator or sentry to sync with the network from days to minutes. The limitations of this are that there is not a full transaction history, just the most recent state that the state-sync RPC has stored. An advantage of state-sync is that the database is very small in comparison to a fully synced node, therefore using state-sync to resync your node to the network can help keep running costs lower by minimising storage usage.
By syncing to the network with state-sync, a node can avoid having to go through all the upgrade procedures and can sync with the most recent binary only.
Polkachu operate and maintain a snapshot RPC for the
The state-sync configuration is as follows:
# snapshot-interval specifies the block interval at which local state sync snapshots are
# taken (0 to disable). Must be a multiple of pruning-keep-every.
snapshot-interval = 2000
# snapshot-keep-recent specifies the number of recent snapshots to keep and serve (0 to keep all).
snapshot-keep-recent = 10
SNAP_RPCvariable to the polkachu snapshot RPC
LATEST_HEIGHTfrom the snapshot RPC, set the state-sync
BLOCK_HEIGHTand fetch the
TRUST_HASHfrom the snapshot RPC. The
BLOCK_HEIGHTto sync is determined by subtracting the snapshot-interval from the
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)
Check variables to ensure they have been set
echo $LATEST_HEIGHT $BLOCK_HEIGHT $TRUST_HASH
# output should be something similar to:
# 1002969 1000969 0B532538F74C946B82D1697704B25F2D8E12D989766B30AF5F8730A7A7A94CDB
Set the required variables in
sed -i.bak -E "s|^(enable[[:space:]]+=[[:space:]]+).*$|\1true| ; \
s|^(rpc_servers[[:space:]]+=[[:space:]]+).*$|\1\"$SNAP_RPC,$SNAP_RPC\"| ; \
s|^(trust_height[[:space:]]+=[[:space:]]+).*$|\1$BLOCK_HEIGHT| ; \
Stop the node and reset the node database
sudo systemctl stop cosmovisor
junod tendermint unsafe-reset-all --home $HOME/.juno
Restart node and check logs
sudo systemctl restart cosmovisor && journalctl -fu cosmovisor -o cat