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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.

    
  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.
    
  4. Modify the configuration file of each node
Config ItemSR FullnodeFullNodeDescription
localwitnessThe private key of witness addressPlease do not fill in dataGenerating blocks requires signing with a private key
genesis.block.witnessesWitness addressThe same as SR node'sGenesis block related configuration
genesis.block.AssetsPreset TRX for specific accounts. Write the pre-prepared address and specify its TRX balance as neededThe same as SR node'sGenesis block related configuration
p2p.versionany positive integer except for 11111the same as SR node'sOnly nodes of the same p2p version can shake hands successfully
seed.nodePlease do not fill in dataChange the seed.node ip.list in the configuration file to the IP address and the port (`listen.port`) of the SREnables fullnode to establish connection with SR node and synchronize data
needSyncCheckfalsetrueSet the first SR’s needSyncCheck to false, other SRs true
node.discovery.enabletruetrueIf it is false, the current node will not be discovered by other nodes
block.proposalExpireTime600000The same as SR node'sThe default proposal effective time is 3 days: 259200000 (ms), if you want to quickly pass the proposal, you can set this item to a smaller value, such as 10 minutes, that is, 600000ms
block.maintenanceTimeInterval300000The same as SR node'sThe defaul maintenance time interval is 6 hours: 21600000 (ms), if you want to pass the proposal quickly, you can set this item to a smaller value, such as five minutes, that is, 300000ms.
committee.allowSameTokenName11Allow same token name
committee.allowTvmTransferTrc1011Allow tvm transfer TRC10
  1. 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
  2. Startup the node
    • Fullnode that produces blocks
      
    • Fullnode
      
  3. 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/proposalcreate`](🔗)to 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.