Joining Mainnet
General instructions to join the Juno mainnet after network genesis.
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General instructions to join the Juno mainnet after network genesis.
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To get up and running with the junod binary, please follow the instructions .
The Juno Network has undergone several upgrades since the network inception on October 1st 2021. There was a hard fork after the network was attaked with a smart contract vulnerability on July 28th 2022.
The second is the current mainnet "Juno Phoenix 2" which raised Juno from the ashes on July 28th 2022.
The correct version of the binary for mainnet at genesis (Phoenix) was v9.0.0.
Releases after genesis can be found in the mainnet repo.
The minimum recommended hardware requirements for running a validator for the Juno mainnet are:
4 Cores (modern CPU's)
32GB RAM
1TB of storage (SSD or NVME)
These specifications are the minimum recommended. As Juno Network is a smart contract platform, it can at times be very demanding on hardware. Low spec validators WILL get stuck on difficult to process blocks.
If you are running less than 32GB RAM, we recommend adding a swap on NVME storage to help process large and complex blocks.
Note that the mainnet will accumulate data as the blockchain continues. This means that you will need to expand your storage as the blockchain database gets larger with time.
For this guide, we will be using shell variables. This will enable the use of the client commands verbatim. It is important to remember that shell commands are only valid for the current shell session, and if the shell session is closed, the shell variables will need to be re-defined.
If you want variables to persist for multiple sessions, then set them explicitly in your shell .profile, as you did for the Go environment variables.
To clear a variable binding, use unset $VARIABLE_NAME. Shell variables should be named with ALL CAPS.
The current Juno Network chain-id is juno-1. Set the CHAIN_ID:
Choose your <moniker-name>, this can be any name of your choosing and will identify your validator in the explorer. Set the MONIKER_NAME:
These instructions will direct you on how to initialize your node, synchronize to the network and upgrade your node to a validator.
This will generate the following files in ~/.juno/config/
genesis.json
node_key.json
priv_validator_key.json
This will replace the genesis file created using junod init command with the mainnet genesis.json.
We can set the seeds by retrieving the list of seeds from the cosmoscontracts/mainnet repo and using sed to inject into ~/.juno/config/config.toml:
For RPC nodes and Validator nodes we recommend setting the following minimum-gas-prices. As we are a permissionless wasm chain, this setting will help protect against contract spam and potential wasm contract attack vectors.
In $HOME/.juno/config/app.toml, set minimum gas prices:
Either create a new key pair, or restore an existing wallet for your validator:
Replace <key-name> with a key name of your choosing.
After creating a new key, the key information and seed phrase will be shown. It is essential to write this seed phrase down and keep it in a safe place. The seed phrase is the only way to restore your keys.
You will require some Juno tokens to bond to your validator. To be in the active set you will need to have enough tokens to be in the top 150 validators by delegation weight.
If syncing a node from the "Phoenix 2" genesis, the initial "invariant checks" will take many hours to complete. If you want to skip invariant checks, thart the node with --x-crisis-skip-assert-invariants flag. This will still take around 30+ minutes to start the node.
There are methods to sync a node to the network:
From genesis and following the Mainnet Upgrades path
After starting the junod daemon, the chain will begin to sync to the network. The time to sync to the network will vary depending on your setup and the current size of the blockchain, but could take a very long time. To query the status of your node:
If this command returns true then your node is still catching up. If it returns false then your node has caught up to the network current block and you are safe to proceed to upgrade to a validator node.
When syncing from genesis, you will need to perform upgrades while catching up to the head. juno-1 upgrades are detailed in Mainnet Upgrades along with a description of each type of upgrade.
Do not attempt to upgrade your node to a validator until the node is fully in sync as per the previous step.
To upgrade the node to a validator, you will need to submit a create-validator transaction:
There are certain files that you need to backup to be able to restore your validator if, for some reason, it damaged or lost in some way. Please make a secure backup of the following files located in ~/.juno/config/:
priv_validator_key.json
node_key.json
It is recommended that you encrypt the backup of these files.
Download the the "Phoenix" geneis file. The following instructions download the genesis file hosted by .
If you do not have any Juno tokens for you validator you can purchase tokens on , , or .
Follow instructions to setup cosmovisor and start the node.
During the syncing process you will need to install binary upgrades at the correct height. Please refer to for further information.
