Switch Networks

By default, an Algorand installation is configured to run on MainNet. For most users, this is the desired outcome. Developers, however, need access to TestNet or BetaNet networks. This guide describes switching between networks.

Replacing the Genesis file

Every Algorand node has a data directory that is used to store the ledger and other configuration information. As part of this configuration, a genesis.json file is used. The genesis.json file specifies the initial state of the blockchain - its β€˜genesis block’. This is a JSON formatted file with the schema for the blockchain. It contains the network name and id, the protocol version and list of allocated addresses to start the chain with. Each address contains a list of things like address status and the amount of Algos owned by the address.

As part of the installer, a genesisfiles directory is created under the node's installed location for binaries. This directory contains additional directories for each of the Algorand networks: BetaNet, TestNet, and MainNet. These directories contain the genesis.json file for each of the Algorand networks (eg ~/node/genesisfiles/mainnet/genesis.json).

Info

The genesis file for Debian and RPM installs are stored in the /var/lib/algorand/genesis/ directory.

The network can be switched by either replacing the current genesis file located in the data directory with the specific network genesis.json or by creating a new data directory and copying the specific network genesis.json file to the new data directory. Replacing the current genesis file will not destroy the current network data, but will prevent running multiple networks on the same node. To run multipe networks at the same time multiple data directories are required.

Using a new Data Directory

To construct a new data directory follow the steps described below that depend on the type of install that was used with the current node.

Mac OS or Other Linux Distros

Assume the node binaries are currently installed in ~/node and the data directory is set to ~/node/data. Create the new data directory for the network that is being switched to. (eg ~/node/testnetdata).

cd ~/node
./goal node stop -d data
mkdir testnetdata 
cp ~/node/genesisfiles/testnet/genesis.json ~/node/testnetdata
Startup the new node using the -d option to point at the new network.

./goal node start -d ~/node/testnetdata

The node will restart and begin communicating with the TestNet network. It will need to sync with the network which will take time. Run the following command to check the current sync status.

./goal node status -d ~/node/testnetdata

At this point, the original network can be stared as well using the standard data directory.

Debian or RPM installs

For Debian and RPM installs the data directory is set to /var/lib/algorand. With these installs, the genesis files are stored in /var/lib/algorand/genesis/. Create the new data directory for the network that is being switched to. (eg /var/lib/algorand_testnet).

ALGORAND_DATA=/var/lib/algorand_testnet
sudo mkdir -p ${ALGORAND_DATA}
Copy the specific network genesis file to the new directory and set the ownership to the algorand account.

sudo cp -p /var/lib/algorand/genesis/devnet/genesis.json ${ALGORAND_DATA}/genesis.json
sudo cp -p /var/lib/algorand/system.json ${ALGORAND_DATA}/system.json
sudo chown -R algorand ${ALGORAND_DATA}

Use systemctl to enable the process and start it.

sudo systemctl enable [email protected]$(systemd-escape ${ALGORAND_DATA})
sudo systemctl start [email protected]$(systemd-escape ${ALGORAND_DATA})
The process can be disabled or stopped using systemctl commands.

sudo systemctl stop [email protected]$(systemd-escape ${ALGORAND_DATA})
sudo systemctl disable [email protected]$(systemd-escape ${ALGORAND_DATA})

DNS Configuration for betanet

For the betanet network, when installing a new node or relay, make the following modification to the config.json file located in the node's data directory. First, if there is not a config.json, make a copy of the config.json.example file.

cp config.json.example config.json
Then edit the config.json file and replace the line
"DNSBootstrapID": "<network>.algorand.network",
with
"DNSBootstrapID": "<network>.algodev.network",
This modification to the DNSBootstrapID is only required for the betanet network.