Category Archives: Software

How to debug typescript app in VS Code? In VS Code goto Debug -> Add Configuration… and add following configuration to launch.json 2. cd to the directory where app.ts is located and from there run $ /usr/local/bin/node –nolazy -r ts-node/register … Continue reading →

Hyperledger Fabric (HL Fabric for short) provides an installation script that be found at https://raw.githubusercontent.com/hyperledger/fabric/master/scripts/bootstrap.sh Running it like ./bootstrap.sh does 3 things: It will create a directory named bin and install Fabric binaries in it It will also create a … Continue reading →

Woke up yesterday all excited that today I will add a nodejs sample showing how to use ABAC (Attribute Based Access Control) in Hyperledger Fabric and submit a pull request. Here is how it went. Things needed to be done: … Continue reading →

By default Fabric will use the version tagged latest. To use another version (known as image_tag in docker parlance) edit the docker-compose.yaml like so image:hyperledger/fabric-ca-tools:1.3.0 above will tell docker to use the image tagged 1.3.0 see: https://stackoverflow.com/questions/33816456/how-to-tag-docker-image-with-docker-compose https://docs.docker.com/compose/compose-file/#image

I left the balance-transfer app running on my server for a few days and now the disk space is full. $ df -h –total Filesystem Size Used Avail Use% Mounted on udev 1.7G 0 1.7G 0% /dev tmpfs 342M 36M … Continue reading →

This post is meant to outline the sad state of software development in some big corporations. Its hard to put numbers but very roughly speaking for every changeset: Only 10% of the time is spent in coding the actual meat … Continue reading →

why use it?https://unix.stackexchange.com/questions/479/keep-ssh-sessions-running-after-disconnectionanother good alternative is to use nohup (instead of tmux esp. when you want to copy-paste) but with it remember to delete the log files. seehttps://unix.stackexchange.com/questions/45913/is-there-a-way-to-redirect-nohup-output-to-a-log-file-other-than-nohup-out for how to direct the output to a file other than nohup.out … Continue reading →

Best paper on blockchain: https://nvlpubs.nist.gov/nistpubs/ir/2018/NIST.IR.8202.pdf Start by watching this video. Then read these two articles: Blockchain Part I Blockchain Part II and the original bitcoin article. Stop. Do not read more – you will learn more by reading and understanding … Continue reading →

Functional comparison of Blockchain and Git Blockchain Git Single source of truth ✔ ✔ Know who committed a change ✔ ✔ Track history of an asset ✔ ✔ (asset could be a file) Consensus ✔ ✔ (code review + unit … Continue reading →

ran into several issues while trying to install hyperldger fabric on a fresh mac following the instructions at https://hyperledger-fabric.readthedocs.io/en/release-1.2/install.html. writing this post to remember how to fix the errors in future. There are two issues in above: git is not installed … Continue reading →