# Installing a Validator Node

This page will guide you through the process of installing and updating a validator node.

After preparing the user permissions, the script configurations, and the keys, the actual node installation can begin. The Validator script is a multi-purpose tool for managing your node, it is accessible to Mainnet, Devnet or Testnet.

Following these few steps, we will work on installing the MultiversX Network validator node to get it up and running on your local machine.

For installation, one must start the scripts by:

cd ~/mx-chain-scripts./script.sh

After that, a menu will appear with the following options. Select the option 1 to install the node.

 1) install 2) observing_squad 3) upgrade 4) upgrade_squad 5) upgrade_proxy 6) remove_db 7) start 8) stop 9) cleanup 10) github_pull 11) add_nodes 12) get_logs 13) benchmark 14) quit Please select an action:1
note

As an alternative, the installation can be triggered by executing the following command:

~/mx-chain-scripts/script.sh start
• When asked, indicate the number of nodes you want to run, i.e. 1
• When asked, indicate the name of your validator, i.e. Valar
• Quit the menu without starting (we need keys first) by using 14 - quit

Create a new folder "VALIDATOR_KEYS" to serve as a local backup when updating:

cd ~mkdir -p ~/VALIDATOR_KEYS

Generate a certificate file containing your Validator key by running the keygenerator:

./elrond-utils/keygenerator

Copy the generated validatorKey.pem file to the config folder of your node(s), and repeat for each node.

    cp validatorKey.pem ~/elrond-nodes/node-0/config/
tip

Each node needs its unique validatorKey.pem file

Then copy the validatorKey.pem file - in ZIP form - to the $HOME/VALIDATOR_KEYS/ folder . This is important for your node to be able to restart correctly after an upgrade. zip node-0.zip validatorKey.pemmv node-0.zip$HOME/VALIDATOR_KEYS/

Repeat the above process for all your “n” nodes. When complete, please refer to our Key management section for instructions about how to properly backup and protect your keys.

### Start the node(s)​

~/mx-chain-scripts/script.sh start

### Start the node visual interface​

Once the node has started, you can check its progress, using the TermUI interface. Navigate to your $HOME/elrond-utils directory and start the TermUI, one for each of your nodes: cd$HOME/elrond-utils./termui -address localhost:8080
tip

Your first node is called node-0 and it is a REST API that will run on port 8080 by default. The next node is node-1on port 8081, and so on.

Upgrade your node by running the script and selecting either of these options:

• 10 - github_pull downloads the latest version of the scripts
• 3 - upgrade
• 7 - start
• 14 - quit
~/mx-chain-scripts/script.sh

These are the basic steps. Please carefully read the on-screen instructions, refer to the scripts readme file. You can also ask any questions in the MultiversX Validators chat

Your private keys are needed to run your node. Losing them means losing control of your node. A 3rd party gaining access to them could result in loss of funds.

Find them in \$HOME/elrond-nodes/node-0/config [be mindful of your “n” nodes]

info

Create a safe backup for them on storage outside of the server running your node(s).

## Migration from old scripts​

Before the release of the current mx-chain-scripts, there were the elrond-go-scripts-testnet, elrond-go-scripts-devnet and elrond-go-scripts-mainnet for setting up nodes on the testnet, devnet and mainnet respectively. Those three repositories have been deprecated because elrond-go-scripts can be used to manage nodes regardless of their target network (testnet, devnet or mainnet).

If one wants to migrate from the old scripts to the new ones, it is generally possible to do so while preserving the validator keys, current node installation, DB and logs. These are the steps to be followed:

• clone the mx-chain-scripts repo near the old one (elrond-go-scripts-testnet/elrond-go-scripts-devnet/elrond-go-scripts-mainnet); assuming the old scripts were located in the home directory, run the following:
cd ~git clone https://github.com/multiversx/mx-chain-scripts
• configure the new scripts as described in the sections above;
• make sure you set the new ENVIRONMENT variable declared within ~/mx-chain-scripts/config/variables.cfg; it must contain one of "testnet", "devnet" or "mainnet";
• call the migrate operation on the scripts:
cd ~/mx-chain-scripts./script.sh migrate

Be careful as to not mix the previous installation network with the new one. This might lead to unpredictable results.

## Choosing a custom configuration tag or branch​

caution

This option should be only used when debugging or testing in advance of a pre-release tag. Use this on your own risk!

The power of the scripts set has been leveraged with a new addition: the possibility to tell the scripts a specified tag or branch (not recommended using a branch due to the fact that an unsigned commit might bring malicious code or configs)

To accomplish this, edit the variables.cfg file

cd ~/mx-chain-scripts/confignano variables.cfg

locate the OVERRIDE_CONFIGVER option and input a value there, something like tags/T1.3.14.0. The tags/ prefix will tell the scripts to use the tag and not search a branch called T1.3.14.0. Call the upgrade command on the scripts to install the desired configuration version.

Resetting the value to "" will make the scripts to use the released version.

caution

The OVERRIDE_CONFIGVER is not backed up when calling github_pull operation.