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CouchDB Server Admin Web Portal
What is CouchDB Server Admin Web Portal? If you are running BYFN (Build Your First Network) with the CouchDB option, the World State of each peer node is stored a CouchDB server running as Docker container. The CouchDB server supports an admin web portal that allows you manage the CouchDB server, it...
2019-04-19, 344👍, 0💬

Install Docker CE on Ubuntu with "apt"
How to install Docker CE (Community Edition) on Ubuntu with "apt"? You can follow this tutorial to install Docker CE (Community Edition) on Ubuntu with the "apt" tool. 1. Get your Ubuntu codename with "lsb_release" command. $ lsb_release -cs bionic 2. Get your system architecture name with "arch" or...
2019-04-18, 187👍, 0💬

Impact of Stopping Chaincode Container
What is the impact of stopping a chaincode container of a peer? We know that if a Peer has chaincode installed, it will run it as chaincode container to help the channel to perform a transaction on the chaincode. If you stop a chaincode container of a peer who is not a required member of the chainco...
2019-04-17, 306👍, 0💬

Auto-Start of Required Chaincode Container
Why a chaincode container is automatically started? A chaincode container will be automatically started, if a chaincode is invoked and the chaincode container's peer is a required peer for the chaincode. Let's continue with the previous tutorial to see this behavior. 6. Stop the chaincode container ...
2019-04-17, 295👍, 0💬

Not All Member Peers Run Chaincode
How to find out which member peers are running a given chaincode? When a chaincode is instantiated on a channel, you don't need all member peers to install the chaincode and run it. But we have to have some member peers to install and run it. Otherwise, no transactions can be performed on this chain...
2019-04-17, 287👍, 0💬

"docker container list --all" - List All Containers
How to list all containers on the Docker Engine with "docker container list --all" command? The default "docker container list" or "docker ps" command lists only running containers. If you want to see all containers including those that were stopped, you need to use the "--all" option. Here is a lis...
2019-04-16, 312👍, 0💬

Instantiate Chaincode on BYFN Channel
How to Instantiate Chaincode on BYFN Channel? You can follow this tutorial to Instantiate Chaincode on BYFN Channel manually. 1. Verify the installed chaincode: $ docker exec -it cli bash bash-4.4# echo $CORE_PEER_ADDRESS peer0.org2.example.com:7051 bash-4.4# peer chaincode list --installed Get inst...
2019-04-14, 2858👍, 0💬

Hyperledger Composer Playground
Where to find tutorials on Hyperledger Composer Playground. Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team on Hyperledger Composer Playground. What Is Hyperledger Composer Playground Start Hyperledger Composer Playground What Is Basic Sample Busi...
2019-04-13, 245👍, 0💬

Update Anchor Peer of Each BYFN Organization
How to Update Anchor Peer of Each BYFN Organization? You can follow this tutorial to Update Anchor Peer of Each BYFN Organization. 1. Update the default peer as the anchor peer: bash-4.4# echo $CORE_PEER_ADDRESS peer0.org2.example.com:7051 bash-4.4# peer channel update -o orderer.example.com:7050 -c...
2019-04-13, 695👍, 0💬

Install Chaincode on BYFN Peers
How to install chaincode on BYFN peers? You can follow this tutorial to install chaincode on BYFN peers manually. 1. Verify the chaincode source file on the BYFN CLI container: $ docker exec -it cli bash bash-4.4# bash-4.4# echo $GOPATH /opt/gopath bash-4.4# ls -l $GOPATH/src/github.com/chainco de/ch...
2019-04-13, 407👍, 0💬

BYFN Chaincode - chaincode_example02.go
What is the chaincode in Golang used in BYFN (Build Your First Network)? The chaincode in Golang used in BYFN (Build Your First Network) is located in the chaincode_example02.go file and localed in hyperledger-binaries/fabric-sa mples/chaincode/chaincode_exam ple02/go/directory: $ cd hyperledger-bina...
2019-04-13, 348👍, 0💬

Docker Client (or CLI) on Ubuntu
Where to find tutorials on Docker Client (or CLI) for Ubuntu systems? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team as Introduction to Docker Client (or CLI) for Ubuntu systems. What Is Docker Client (or CLI) on Ubuntu "docker container" - Manag...
2019-04-12, 222👍, 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, 257👍, 0💬

Azure AD B2C "id_token" from Google
Where to find an Azure AD B2C "id_token" example from Google as an external identity provider? Here is an Azure AD B2C "id_token" example from Google as an external identity provider: Header: { "typ": "JWT", "alg": "RS256", "kid": "X5eXk4xyojNFum1kl2Ytv8dlNP4-c 57dO6QGTVBwaNk"} Claims: { "exp": 1547...
2019-04-11, 401👍, 0💬

What Is Ledger Peer Operation RESTful API
What is Ledger Peer Operation RESTful API? Ledger Peer Operation RESTful API is RESTful Web service provided by a ledger peer. It is different than and separated from the primary ledger Web service provided by the ledger peer. Ledger Peer Operation RESTful API exposes the following functionalities: ...
2019-04-11, 297👍, 0💬

"docker container create" - Create Container
How to create a new container from an image with "docker container create" command? You can create a new container from an image with "docker container create" command by giving the image name. 1. Get the image name with the "docker image list" command. $ docker image list | grep hello-world hello-w...
2019-04-06, 274👍, 0💬

What Is Docker Client (or CLI) on Ubuntu
What is Docker Client, or CLI (Command Line Interface), on Ubuntu? Docker Client, or CLI (Command Line Interface), on Ubuntu is a command line tool that allows you to manage the Docker environment, including the Docker Engine, Containers, Images, and Registries. Here is a list of commands you can ru...
2019-04-06, 247👍, 0💬

"docker image" - Manage Images
How to manage images with "docker image" commands? A Docker image is a binary file used to build containers. Images are used to store and ship applications. You can use "docker image" commands to manage Docker images. Here is a list of sub-commands supported by "docker image": $ docker image --help ...
2019-04-05, 218👍, 0💬

Build Implicit Flow with Azure AD v2
How to implement the OpenID Implicit Flow with Azure AD v2.0 service? If you want to implement the OpenID Implicit Flow in your Web application to use Azure AD service, you should follow these steps: 1. Building the Azure AD v2.0 Sign-on authentication request: Register your Web application to the A...
2019-04-03, 419👍, 0💬

Azure AD v2 id_token Decoded Example
Where to find an Azure AD v2.0 id_token decoded example? Here is an example of an "id_token" value returned from Azure AD v2.0 after Base64URL decoded: Header = { "typ": "JWT", "alg": "RS256", "kid": "1LTMzakihiRla_8z2BEJVXeWMqo" } Body = { "ver": "2.0", "iss": "https://login.microsoftonline .com/918...
2019-04-03, 377👍, 0💬

Azure AD v2 id_token Is Smaller
Where Azure AD v2.0 id_token is smaller than v1.0? Azure AD v2.0 id_token is smaller than v1.0, because the number of default claims (properties) are reduced in Azure AD v2.0 id_tokens as shown in the table below: Azure AD v2.0 Azure AD v1.0 ver=2.0 ver=1.0 rh iss iss sub sub aud aud exp exp iat iat...
2019-04-03, 360👍, 0💬

Dump Azure AD v2.0 Authentication Response
How to build a PHP script to dump Azure AD 2.0 Authentication Response? If you are use the Azure-AD-Authentication-Reques t-Test.htmltest Web form, you need to write a server side script to dump the Azure AD Authentication Response. Here is an example of PHP script, openID_receiver.php, that dumps a...
2019-04-03, 358👍, 0💬

Decode Azure AD v2 id_token
How to decode the id_token value received from Azure AD v2.0 authentication response? According to the "RFC 7519 - JWT (JSON Web Token)" standard, the "id_token" value received from Azure AD authentication response should be decoded as below: Splitting the encoded string into 3 components: Header, B...
2019-04-03, 353👍, 0💬

What Is Alpine Linux Docker Image
What is Alpine Linux Docker Image? Alpine Linux Docker Image is a minimal Docker image of the Alpine Linux operating system. with only 5 MB in size. You can use Alpine Linux as the base image to build new Docker images for your own applications. Main features of Alpine Linux are: SMALL - Alpine Linu...
2019-04-03, 302👍, 0💬

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