Evmos can dump the entire application state to a JSON file. This, besides upgrades, can be useful for manual analysis of the state at a given height.
Export state with:
evmosd export > new_genesis.json
You can also export state from a particular height (at the end of processing the block of that height):
evmosd export --height [height] > new_genesis.json
If you plan to start a new network for 0 height (i.e genesis) from the exported state,
export with the
evmosd export --height [height] --for-zero-height > new_genesis.json
Manually Migrate State
If you want to migrate state manually, e.g. for local testing purpose. Note that for regular chain upgrades, a manual state migration is not required.
After exporting your state into a json file,
you can replace the old
cp -f genesis.json new_genesis.json
mv new_genesis.json genesis.json
At this point, you might want to run a script to update the exported genesis into a genesis state that is compatible with your new version.
You can use the
migrate command to
migrate from a given version to the next one (eg:
evmosd migrate TARGET_VERSION GENESIS_FILE --chain-id=<new_chain_id> --genesis-time=<yyyy-mm-ddThh:mm:ssZ>