54 lines
3.1 KiB
Markdown
54 lines
3.1 KiB
Markdown
---
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order: false
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---
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# simapp
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simapp is an application built using the Cosmos SDK for testing and educational purposes.
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## Running testnets with `simd`
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If you want to spin up a quick testnet with your friends, you can follow these steps.
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Unless otherwise noted, every step must be done by everyone who wants to participate
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in this testnet.
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1. From the root directory of the Cosmos SDK repository, run `$ make build`. This will build the
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`simd` binary inside a new `build` directory. The following instructions are run from inside
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the `build` directory.
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2. If you've run `simd` before, you may need to reset your database before starting a new
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testnet. You can reset your database with the following command: `$ ./simd unsafe-reset-all`.
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3. `$ ./simd init [moniker] --chain-id [chain-id]`. This will initialize a new working directory
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at the default location `~/.simapp`. You need to provide a "moniker" and a "chain id". These
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two names can be anything, but you will need to use the same "chain id" in the following steps.
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4. `$ ./simd keys add [key_name]`. This will create a new key, with a name of your choosing.
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Save the output of this command somewhere; you'll need the address generated here later.
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5. `$ ./simd add-genesis-account [key_name] [amount]`, where `key_name` is the same key name as
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before; and `amount` is something like `10000000000000000000000000stake`.
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6. `$ ./simd gentx [key_name] [amount] --chain-id [chain-id]`. This will create the genesis
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transaction for your new chain. Here `amount` should be at least `1000000000stake`. If you
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provide too much or too little, you will encounter an error when starting your node.
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7. Now, one person needs to create the genesis file `genesis.json` using the genesis transactions
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from every participant, by gathering all the genesis transactions under `config/gentx` and then
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calling `$ ./simd collect-gentxs`. This will create a new `genesis.json` file that includes data
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from all the validators (we sometimes call it the "super genesis file" to distinguish it from
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single-validator genesis files).
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8. Once you've received the super genesis file, overwrite your original `genesis.json` file with
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the new super `genesis.json`.
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9. Modify your `config/config.toml` (in the simapp working directory) to include the other participants as
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persistent peers:
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```
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# Comma separated list of nodes to keep persistent connections to
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persistent_peers = "[validator_address]@[ip_address]:[port],[validator_address]@[ip_address]:[port]"
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```
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You can find `validator_address` by running `$ ./simd tendermint show-node-id`. The output will
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be the hex-encoded `validator_address`. The default `port` is 26656.
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10. Now you can start your nodes: `$ ./simd start`.
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Now you have a small testnet that you can use to try out changes to the Cosmos SDK or Tendermint!
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NOTE: Sometimes creating the network through the `collect-gentxs` will fail, and validators will start
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in a funny state (and then panic). If this happens, you can try to create and start the network first
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with a single validator and then add additional validators using a `create-validator` transaction.
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