To build a private chain, it is necessary to deploy at least one fullnode running by SR to produces blocks, and any number of fullnodes to synchronize blocks and broadcast transactions. Only one SR node and one fullnode are set up in this example.

Preparation

• Oracle JDK 1.8
• Create at least two TRON network address and save the address and private key. You can use tronweb or wallet-cli or Tronlink to create address.

Deployment Guide

The process of building a node on private chain is the same as that on mainnet. The difference is the content of the node configuration file. The most important step to build a private chain is to modify the configuration items in the configuration file, so that the nodes can form a private network for node discovery, block synchronization and broadcast transactions.

1. Create deployment directory
   Create deployment directory, it is recommended to put the two fullnodes in different directories.
   $ mkdir SR $ mkdir FullNode
2. Obtain FullNode.jar, then put it into the SR and FullNode directories respectively.

   $ cp FullNode.jar ./SR
   $ cp FullNode.jar ./FullNode
   

3. Obtain the node's config file private_net_config.conf, and put it into the SR and FullNode directories respectively, and modify the file names respectively to supernode.conf, fullnode.conf.

   $ cp private_net_config.conf ./SR/supernode.conf
   $ cp private_net_config.conf ./FullNode/fullnode.conf
   

4. Modify the configuration file of each node

5. Modify the port in the configuration file, and configure the SR and FullNode with different port numbers. Note that this step is required if SR and FullNode are running on the same machine, otherwise, this step can be skipped.

   • listen.port ： p2p listen port
   • http port： Http listen port
   • rpc port： rpc listen port

6. Startup the node

   • Fullnode that produces blocks

     $ java -Xmx6g -XX:+HeapDumpOnOutOfMemoryError -jar FullNode.jar  --witness  -c supernode.conf
     

   • Fullnode

     $ java -Xmx6g -XX:+HeapDumpOnOutOfMemoryError -jar FullNode.jar  -c fullnode.conf
     

7. Modify the dynamic parameters of the private chain

   In order to be the same as the main network environment, the dynamic parameters of the private chain need to be modified to be consistent with those of the main network. The modification of dynamic parameters can be done through proposals. The SR account can use tronweb or wallet-cli or fullnode http API wallet/proposalcreateto create proposals, wallet/proposalapprove to approve proposals.

   The following are the dynamic parameters and values sorted out according to the proposals passed by the mainnet successively. SR can directly use the following commands to create a proposal to complete the modification of all the dynamic parameters of the private chain at one time.

   javascript=

   var TronWeb = require('tronweb');
   var tronWeb = new TronWeb({
           fullHost: 'http://localhost:16887',
           privateKey: 'c741f5c0224020d7ccaf4617a33cc099ac13240f150cf35f496db5bfc7d220dc'
       })
   
   var unsignedProposal1Txn = await tronWeb.transactionBuilder.createProposal([{"key":9,"value":1},{"key":10,"value":1},{"key":11,"value":280},{"key":19,"value":90000000000},{"key":15,"value":1},{"key":18,"value":1},{"key":16,"value":1},{"key":20,"value":1},{"key":26,"value":1},{"key":30,"value":1},{"key":5,"value":16000000},{"key":31,"value":160000000},{"key":32,"value":1},{"key":39,"value":1},{"key":41,"value":1},{"key":3,"value":1000},{"key":47,"value":10000000000},{"key":49,"value":1},{"key":13,"value":80},{"key":7,"value":1000000},{"key":61,"value":1500},{"key":63,"value":1}],"41D0B69631440F0A494BB51F7EEE68FF5C593C00F0")
   var signedProposal1Txn = await tronWeb.trx.sign(unsignedProposal1Txn, "c741f5c0224020d7ccaf4617a33cc099ac13240f150cf35f496db5bfc7d220dc");
   var receipt1 = await tronWeb.trx.sendRawTransaction(signedProposal1Txn);
   
   setTimeout(async function() { 
           console.log("Vote proposal!") 
           var unsignedVoteP1Txn = await tronWeb.transactionBuilder.voteProposal(1, true, tronWeb.defaultAddress.hex)
           var signedVoteP1Txn = await tronWeb.trx.sign(unsignedVoteP1Txn, "c741f5c0224020d7ccaf4617a33cc099ac13240f150cf35f496db5bfc7d220dc");
           var rtn1 = await tronWeb.trx.sendRawTransaction(signedVoteP1Txn);
       }, 1000)