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Start/Stop Hyperledger Fabric Dev Environment
How to start and stop Hyplerledger Fabric Dev Environment? You can follow this tutorial to start and stop Hyplerledger Fabric on Ubuntu. 1. Make sure the Docker Engine is running: $ ps -e | grep dockerd 17939 ? 00:39:58 dockerd $ docker info Containers: 6 Running: 4 Paused: 0 Stopped: 2 Images: 88 S...
2021-04-04, ∼1441🔥, 0💬

Verify World State in CouchDB
How to Verify World State in CouchDB container? Since peer0.org1.example.com uses the couchdb container to store the world state, you can check the current states of all assets managed by the chaincode. 1. Get database name for the chaincode "fabcar": $ curl http://localhost:5984/_all_dbs ["_replica...
2020-02-20, ∼1439🔥, 0💬

"docker image pull" - Pull Image
How to pull an image from the remote registry to the local repository with "docker image pull" command? If you know the name of a Docker image, you can pull it from the remote registry to your local repository using the "docker image pull", or "docker pull" command. 1. Run "docker image pull" comman...
2019-04-22, ∼1439🔥, 0💬

Business Network Source Code Architecture
What Is Business Network Source Code Architecture? Business Network Source Code Architecture can be summarized in the following diagram: Hyperledger Composer offers tools to help you developing hyperledger application, called business network, with following source code files: Model Files (*.cto) - ...
2022-02-19, ∼1436🔥, 0💬

Build the BYFN Network Manually
How to build the BYFN (Build Your First Network) manually? You build the BYFN network automatically with the "./byfn.sh up" script command. But if you want to learn how to build it manually, you need to complete the following steps: 1. Review and revise crypto-config.yaml configuration file, which c...
2020-10-26, ∼1436🔥, 0💬

Prepare User Identity for Isabella
How to Prepare User Identity for Isabella? If Isabella wants to run any application to use the chaincode running the PaperNet, you to prepare a user identity for her. An identity of an application user consists of a private key and a public key certificate issue by the CA node of the PaperNet. Norma...
2019-11-21, ∼1436🔥, 0💬

ERROR(OPF-030) - unique-identifier Not Found
How to fix the "ERROR(OPF-030) - The unique-identifier ... was not found" error? When you validate a EPUB 2.0 package with EpubCheck, you may see the following error: C:\fyicenter&gt; java -jar epubcheck.jar Error-Unique-ID-Not-Found-2.0. epubValidating using EPUB version 2.0.1 rules. ERROR(OPF-...
2022-11-04, ∼1433🔥, 0💬

Peer and CouchDB Container Dependency
Which Peer container depends which CouchDB container in BYFN network? If you are running BYFN (Build Your First Network) with the CouchDB option, the Peer and CouchDB Container Dependency is defined in the "docker-compose-couch.yaml" file. $ cd ~/hyperledger-binaries/fabric- samples/first-network$ m...
2020-07-03, ∼1431🔥, 1💬

"docker container exec" - Execute Command on Running Container
How to Execute an extra Command on a Running Container using the "docker container exec" command? Since Linux system is a multi-tasking system, you can send an extra command to be executed on a running Alpine container. 1. Check the container status to make it is still running. fyicenter$ docker con...
2019-02-17, ∼1431🔥, 0💬

Hyperledger Composer Access Control File
What Is Hyperledger Composer Access Control (*.acl)? A Hyperledger Composer Access Control file is a source code file that define access control rules of which participant can access which assets and execute which transactions. A access control file uses the Access Control Language (ACL) and the .ac...
2020-11-22, ∼1430🔥, 0💬

"docker start/stop" - Start and Stop Docker Containers
How to run "docker start/stop" - Start and Stop Docker Containers for BYFN (Build Your First Network)? If you have your BYFN Docker containers deployed to the Docker Engine, you can use the "docker start/stop" command to manage them. 1. Look at the status of all deployed Docker containers: $ docker ...
2020-10-10, ∼1430🔥, 0💬

"docker container rm" - Remove Container
How to remove a container from the Docker Engine with "docker container rm" command? If a container is no longer needed, you can remove it from the Docker Engine to save space using the "docker container rm" command. 1. Run "docker container list --all" command. You see 2 containers created from the...
2019-04-12, ∼1430🔥, 0💬

FYIcenter JSON to XML Converter
FYIcenter JSON to XML Converter is an online tool that converts a JSON text string to an XML document. JSOM object property names are limited to ASCII characters only.
2017-12-05, ∼1430🔥, 1💬

💬 2017-12-05 Chad: Love it!

"configtxgen" Command - Build *MSPanchors.tx
How to run "configtxgen" command to build a transaction message to define the anchor peer in each organization in BYFN (Build Your First Network)? You can follow this tutorial to run "configtxgen" command to build a transaction message to define the anchor peer in each organization in BYFN. The "con...
2020-10-20, ∼1429🔥, 0💬

Instantiate PaperNet Chaincode (Smart Contract)
How to Instantiate the PaperNet Chaincode (Smart Contract), papercontract.js? Now that papercontract chaincode containing the CommercialPaper chaincode is installed on the required PaperNet peers, you, as administrator, can make it available to different network channels, so that it can be invoked b...
2019-12-02, ∼1428🔥, 0💬

Deploy ca.example.com Manually
How to Deploy ca.example.com as a Docker container manually? You can follow this tutorial to Deploy ca.example.com as a Docker container manually. 1. Verify the configuration of the ca.example.com container defined in the docker-compose.yml file: $ cd ~/hyperledger-binaries/fabric- samples/basic-netw...
2020-03-25, ∼1423🔥, 0💬

"participant" CTO Statement Syntax
What is the syntax of the "participant" CTO Statement The "participant" CTO statement declares a participant data type to represent someone who can interact with the business network under access control rules. Here is the syntax of a "participant" statement: [abstract] participant type_name [identi...
2021-08-01, ∼1421🔥, 0💬

Blockchain Data Files on Peer Container
Where is the location of Blockchain Data Files on a Peer Container? We known that each peer container needs to maintain a copy of the ledger data for each channel it joined. Ledger data is divided into 2 parts: World State and Blockchain. The World State data is stored in a database, like Go LevelDB...
2020-05-29, ∼1421🔥, 0💬

Switch Default Peer on BYFN CLI Container
How to switch the default peer on BYFN CLI Container? I want to join peer0.org2.example.com to the channel. You can follow this tutorial to switch the default peer to peer0.org2.example.com and join it to BYFN "mychannel" channel. 1. Switch the default peer by changing environment variables: bash-4....
2020-09-30, ∼1419🔥, 0💬

Clean Up Docker Engine for WYFA
How to Clean Up Docker Engine to run the WYFA (Writing Your First Application) tutorial? You can follow these steps to setup the Clean Up Docker Engine to run the WYFA (Writing Your First Application) tutorial. 1. Stop existing Hyperledger Fabric Networks on your local host by stopping all Docker co...
2020-02-29, ∼1415🔥, 0💬

Python Modules for MySQL Database
Where to find tutorials on Python modules for MySQL database? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team on Python modules for MySQL database. MySQL Database Server Connection Information "mysql.connector" Module by mysql.com Change Data with...
2021-11-13, ∼1411🔥, 0💬

Install Composer Prerequisites on Ubuntu
How to install Hyplerledger Composer Prerequisites on Ubuntu? The best way to install Hyplerledger Composer Prerequisites on Ubuntu is to download and run the prereqs-ubuntu.sh script. 1. Verify your Ubuntu version: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: U...
2021-05-04, ∼1410🔥, 0💬

Docker Components and Architecture
What are the components of Docker and how they related to each other? Docker consists of several main components: Docker Server (also called Docker Daemon, Docker Server, "dockerd") - The background process that manages Docker containers and handles container objects. The daemon listens for requests...
2019-05-28, ∼1409🔥, 0💬

Install Hyperledger Composer on UBuntu
How to install Hyplerledger Composer on Ubuntu? You can follow this tutorial to install Hyplerledger Composer on Ubuntu 1. Install Hyplerledger Composer CLI: $ sudo npm install -g composer-cli ... installation messages ... $ composer --version v0.20.8 2. Install Hyplerledger Composer REST API Server...
2021-05-04, ∼1403🔥, 0💬

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