# Node start

Follow the commands below to start a Onefinity validator node with the configuration from the `config` folder. Make sure you use the correct validator key or multisig key (`allValidatorsKey.pem`).

## Single Key Validator

```
./node --profile-mode --log-save --log-level *:DEBUG --log-logger-name --log-correlation 
--use-health-service 
--rest-api-interface localhost:9501 
--working-directory ~/working-dir/validator 
--config-external ./config/external_validator.toml 
--config ./config/config_validator.toml
--validator-key-pem-file ./config/validatorKey.pem
```

## Multi-key Validator

```
./node --profile-mode --log-save --log-level *:DEBUG --log-logger-name --log-correlation 
--use-health-service 
--rest-api-interface localhost:9501 
--sk-index 1 
--working-directory ~/working-dir/validator 
--config-external ./config/external_validator.toml 
--config ./config/config_validator.toml
--all-validator-keys-pem-file ./config/allValidatorsKey.pem
```

## Observer

```
./node --profile-mode --log-save --log-level *:INFO --log-logger-name --log-correlation --use-health-service --rest-api-interface localhost:8080 --working-directory ~/working-dir --config-external ./config/external_observer.toml --config ./config/config_observer.toml
```


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```
GET https://docs.onefinity.network/validators/node-start.md?ask=<question>
```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.