Category Archives: Software

Generating random passwords

Posted on February 3, 2020 by Siddharth Jain

[software] here is a useful command to generate a random password from the command line change the last argument to change the length of the password

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How to change the maximum file size you can upload to wordpress

Posted on January 31, 2020 by Siddharth Jain

Spent a lot of time figuring this out and trying out different things suggested by different sites so thought would make a note of it. Its actually quite simple once you know what you need to do. All you need … Continue reading →

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Understanding Docker Volumes

Posted on November 5, 2019 by Siddharth Jain

Docker volumes are a complicated beast. They can be created using the `docker volume create` command or in the docker-compose.yaml file under the volumes section. E.g.: What this does is create persistent storage on the host that 1. does not … Continue reading →

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Cryptogen 1.4.3 Bugs

Posted on October 23, 2019 by Siddharth Jain

As is common for Fabric, the cryptogen utility (1.4.3) has various bugs as of this writing: The most important bug is that the admincerts folder is empty. see https://jira.hyperledger.org/browse/FAB-16933 The next bug (FAB-16936) is that if you are enabling Node … Continue reading →

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Understanding Node OUs in Fabric

Posted on October 23, 2019 by Siddharth Jain

ever seen this in configtx.yaml and wondered what it means? Let me try to explain. Taking this example in configtx.yaml: Policies:   Readers:   Type: Signature   Rule: “OR(‘Org1MSP.admin’, ‘Org1MSP.peer’, ‘Org1MSP.client’)“   Writers:   Type: Signature   Rule: “OR(‘Org1MSP.admin’, ‘Org1MSP.client’)“ … Continue reading →

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Hyperledger Fabric Commercial Paper Sample

Posted on October 22, 2019 by Siddharth Jain

V1.4 of Fabric introduces the commercial-paper sample which is supposed to be the flagship sample showing Fabric development. I had a chance to study it today and I must say it is so ridiculous that I didn’t know whether to … Continue reading →

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Installing MySQL on brand new Ubuntu VM

Posted on October 18, 2019 by Siddharth Jain

https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-18-04 siddjain@engblog:~$ sudo apt update Hit:1 http://azure.archive.ubuntu.com/ubuntu bionic InRelease Get:2 http://azure.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB] Get:3 http://azure.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] Get:5 http://azure.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [753 kB] Get:6 http://azure.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en [271 kB] … Continue reading →

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What blockchain platform should you use to develop a permissioned blockchain?

Posted on August 28, 2019 by Siddharth Jain

When I started my blockchain journey I was shocked to find as many as 21 platforms for developing blockchain applications on some article I read on the web. That immediately sent my head spinning. What platform should I choose to … Continue reading →

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Worst Programs Ever

Posted on June 29, 2019 by Siddharth Jain

Worst Build Tool: MavenWorst IDE: IntelliJ (will not even consider Eclipse)Worst Document Editor: MS Word

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Hyperledger Fabric: Running fabric-ca-server with LDAP

Posted on May 8, 2019 by Siddharth Jain

Background Fabric-ca-server’s main purpose is to act as a CA (certificate authority) that can be used to obtain X509 public cert and private key – something needed in order to write records to fabric ledger. Why? because every entry is … Continue reading →

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