Setup geth interactive JavaScript console - Blockchain as a Service

Download geth according to your platform.
- MAC OS: geth_v2.2.0_darwin_amd64.tar.gz
- Ubuntu: geth_v2.2.0_ubuntu_amd64.tar.gz
Get the Quorum node’s username username and password password. If you have not configured a username and password, you can configure it following the steps in Node Security Management.
Get the Quorum node’s RPC service address noderpcaddress, you can find this information in the Access Endpoint column of My Nodes table.
Connect to the node RPC service port using your node’s username and password to launch the geth JavaScript interactive console.
```
geth attach http://${username}:${userpassword}@${noderpcaddress}
```
You can read the Ethereum Management API and Ethernet DAPP API to get more information for using the geth JavaScript interactive console.