Upgrading chaincode in Hyperledger Fabric

Pre-requisites

Hyperledger Fabric network deployed, network.yaml configuration file already set and chaincode is installed and instantiated.

Modifying configuration file

Refer this guide for details on editing the configuration file.

The network.yaml file should contain the specific network.organizations.services.peers.chaincode.arguments, network.organizations.services.peers.chaincode.version and network.organizations.services.peers.chaincode.name variables which are used as arguments while upgrading the chaincode.

For reference, following snippet shows that section of network.yaml

---
network:
  ..
  ..
  organizations:
    - organization:
      name: manufacturer
      ..
      .. 
      services:
        peers:
        - peer:
          name: peer0          
          ..
          chaincode:
            name: "chaincode_name" #This has to be replaced with the name of the chaincode
            version: "chaincode_version" # This has to be different than the current version
            maindirectory: "chaincode_main"  #The main directory where chaincode is needed to be placed
            repository:
              username: "git_username"          # Git Service user who has rights to check-in in all branches
              password: "git_password"
              url: "github.com/hyperledger-labs/blockchain-automation-framework.git"
              branch: develop
              path: "chaincode_src"   #The path to the chaincode 
            arguments: 'chaincode_args' #Arguments to be passed along with the chaincode parameters
            endorsements: "" #Endorsements (if any) provided along with the chaincode

Run playbook

The playbook chaincode-upgrade.yaml is used to upgrade chaincode to a new version in the existing fabric network. This can be done by using the following command

    ansible-playbook platforms/hyperledger-fabric/configuration/chaincode-upgrade.yaml --extra-vars "@path-to-network.yaml"

NOTE: The Chaincode should be upgraded for all participants of the channel.