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Setting Up a Network For Development

This document covers setting up a network on your local machine for development using Docker containers.

All commands should be run from within the Vagrant environment described in Setting Up Development Environment. See Logging Control for information on controlling logging output from the peer and chaincodes.

Note: When running with security enabled, follow the security setup instructions described in Chaincode Development to set up the CA server and log in registered users before sending chaincode transactions. In this case peers started using Docker images need to point to the correct CA address (default is localhost). CA addresses have to be specified in openchain.yaml variables paddr of eca, tca and tlsca.

Setting up Docker image

To create a Docker image for the hyperledger/fabric, first clean out any active containers (hyperledger-peer and chaincode) using docker ps -a and docker rm commands. Second, remove any old images with docker images and docker rmi commands. Careful: do not remove any other images (like busybox or openblockchain/baseimage) as they are needed for a correct execution.

Now we are ready to build a new docker image:

    cd $GOPATH/src/github.com/hyperledger/fabric/core/container
    go test -run BuildImage_Peer

Check the available images again with docker images, and you should see hyperledger-peer image.

Starting up validating peers

From the Vagrant environment, find out which IP address your docker0 interface is on with ip add command. For example,

vagrant@vagrant-ubuntu-trusty-64:/opt/gopath/src/github.com/hyperledger/fabric$ ip add

<<< detail removed >>>

3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:ad:be:70:cb brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:adff:febe:70cb/64 scope link
       valid_lft forever preferred_lft forever

Your output might contain something like inet 172.17.0.1/16 scope global docker0. That means docker0 interface is on IP address 172.17.0.1. Use that IP address for the CORE_VM_ENDPOINT option. For more information on the environment variables, see core.yaml configuration file in the fabric repository.

The ID value of CORE_PEER_ID must be lowercase since we use the ID as part of chaincode containers we build, and docker does not accept uppercase. The ID must also be unique for each validating peer.

By default, we are using a consensus plugin called NOOPS, which doesn't really do consensus. If you want to use some other consensus plugin, see Using Consensus Plugin section at the end of the document.

Start up the first validating peer:

docker run --rm -it -e CORE_VM_ENDPOINT=http://172.17.0.1:4243 -e CORE_PEER_ID=vp0 -e CORE_PEER_ADDRESSAUTODETECT=true hyperledger-peer fabric peer

If started with security, enviroment variables regarding security enabling, CA address and peer's ID and password have to be changed:

docker run --rm -it -e CORE_VM_ENDPOINT=http://172.17.0.1:4243 -e CORE_PEER_ID=vp0 -e CORE_PEER_ADDRESSAUTODETECT=true -e CORE_SECURITY_ENABLED=true -e CORE_SECURITY_PRIVACY=true -e CORE_PEER_PKI_ECA_PADDR=172.17.0.1:50051 -e CORE_PEER_PKI_TCA_PADDR=172.17.0.1:50051 -e CORE_PEER_PKI_TLSCA_PADDR=172.17.0.1:50051 -e CORE_SECURITY_ENROLLID=vp0 -e CORE_SECURITY_ENROLLSECRET=XX  hyperledger-peer fabric peer

Additionally, validating peer (enrollID vp0 and enrollSecret XX) has to be added to membersrvc.yaml file (in fabric/membersrvc).

####Start up the second validating peer: We need to get the IP address of the first validating peer, which will act as the root node that the new peer will connect to. The address is printed out on the terminal window of the first peer (eg 172.17.0.2). We'll use "vp2" as the ID for the second validating peer.

docker run --rm -it -e CORE_VM_ENDPOINT=http://172.17.0.1:4243 -e CORE_PEER_ID=vp1 -e CORE_PEER_ADDRESSAUTODETECT=true -e CORE_PEER_DISCOVERY_ROOTNODE=172.17.0.2:30303 hyperledger-peer fabric peer

You can start up a few more validating peers in the similar manner as you wish. Remember to change the ID.

Deploy, Invoke, and Query a Chaincode

Note: When security is enabled, modify the CLI commands to deploy, invoke, or query a chaincode to pass the username of a logged in user. To log in a registered user through the CLI or the REST API, follow the security setup instructions described here. On the CLI the username is passed with the -u parameter.

We deploy chaincode to the network with CLI. We can use the sample chaincode to test the network. You may find the chaincode here $GOPATH/src/github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02

Now deploy the chaincode to the network. We can deploy to any validating peer by specifying CORE_PEER_ADDRESS:

cd $GOPATH/src/github.com/hyperledger/fabric
CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode deploy -p github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02 -c '{"Function":"init", "Args": ["a","100", "b", "200"]}'

With security enabled, modify the command as follows:

CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode deploy -u jim -p github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02 -c '{"Function":"init", "Args": ["a","100", "b", "200"]}'

You can watch for the message "Received build request for chaincode spec" on the output screen of all validating peers.

On successful completion, the above command will print the "name" assigned to the deployed chaincode. This "name" is used as the value of the "-n" parameter in invoke and query commands described below. For example the value of "name" could be

bb540edfc1ee2ac0f5e2ec6000677f4cd1c6728046d5e32dede7fea11a42f86a6943b76a8f9154f4792032551ed320871ff7b7076047e4184292e01e3421889c

In a script the name can be captured for subsequent use. For example, run

NAME=`CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode deploy ...`

and then replace <name_value_returned_from_deploy_command> in the examples below with $NAME.

We can run an invoke transaction to move 10 units from 'a' to 'b':

CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode invoke -n <name_value_returned_from_deploy_command> -c '{"Function": "invoke", "Args": ["a", "b", "10"]}'

With security enabled, modify the command as follows:

CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode invoke -u jim -n <name_value_returned_from_deploy_command> -c '{"Function": "invoke", "Args": ["a", "b", "10"]}'

We can also run a query to see the current value 'a' has:

CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode query -l golang -n <name_value_returned_from_deploy_command> -c '{"Function": "query", "Args": ["a"]}'

With security enabled, modify the command as follows:

CORE_PEER_ADDRESS=172.17.0.2:30303 ./peer chaincode query -u jim -l golang -n <name_value_returned_from_deploy_command> -c '{"Function": "query", "Args": ["a"]}'

Using Consensus Plugin

A consensus plugin might require some specific configuration that you need to set up. For example, to use Byzantine consensus plugin provided as part of the fabric, perform the following configuration:

  1. In core.yaml, set the peer.validator.consensus value to obcpbft
  2. In core.yaml, make sure the peer.id is set sequentially as vpX where X is an integer that starts from 0 and goes to N-1. For example, with 4 validating peers, set the peer.id tovp0, vp1, vp2, vp3.
  3. In consensus/obcpbft/config.yaml, set the general.mode value to either classic, batch, or sieve, and the general.N value to the number of validating peers on the network (if you do batch, also set general.batchsize to the number of transactions per batch)
  4. In consensus/obcpbft/config.yaml, optionally set timer values for the batch period (general.timeout.batch), the acceptable delay between request and execution (general.timeout.request), and for view-change (general.timeout.viewchange)

See core.yaml and consensus/obcpbft/config.yaml for more detail.

All of these setting may be overriden via the command line environment variables, eg. CORE_PEER_VALIDATOR_CONSENSUS=pbft or CORE_PBFT_GENERAL_MODE=sieve