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12 DevOps principles read today

DevOps means a concept to bring Development team and operation team together. So that you can speed up the deployment process. Before you start learning the tools you need to understand core principles.
The useful DevOps Principles to know for your project and interviewsTo deliver rapidly without affecting qualityCommunication and Collaboration are the key ideas in DevOps conceptMultiple deploys are possible- if code in Development team automatedOnce you commit the repository, it tests the code automatically against the automated test scriptsIf Build is successfully passed, it installs automatically in Testing environment When infrastructure is automated, it installs automatically to other serversMinor changes takes place in isolation, that means , it creates separate server to deploy minor changesSpeed in Devops, organizations to better serve their customers and compete more effectively in the market.Quality and Security teams are part of DevOpsAutomating the process, much better pro…

Blockchain real story useful beginner to professional

Satoshi Nakamoto created first Blockchain project wished Bitcoin to be secure, anonymous and could work with no centralized intermediary. To achieve that, Nakamoto combined public key cryptography, a distributed ledger, and a consensus algorithm.
  • Nakamoto combined public key cryptography, a distributed ledger, and a consensus algorithm. 
  • The groundwork for each component was painfully laid by people before him, such as Wei Dai, Nick Szabo, Hal Finney, and Adam Back, 
  • The Blockchain can sometimes refer to the combination of all three components or just the distributed ledger
Blockchain ideas
Blockchain ideas

As the name aptly describes, at the heart of the Blockchain there is a chain of blocks, each block containing read-only data that represents monetary transactions. Every time a new block is written, you need to reference the block that immediately precedes it – so at any given point, you can track down the chain up to the very first block created.

How blockchain design works

  • The Blockchain is by design a decentralized and autonomous system, and sometimes more than one block gets created. 
  • To keep the integrity of its ledger, a consensus mechanism is used that considers that the longest chain is always the most trustworthy (it will be mentioned later why that is the case) and nodes can only be allowed to blocks to the chain if they solve an arbitrary mathematical puzzle (also more on that later).

Quiz on blockchain

Messages or transactions are exchanged between nodes through a peer-to-peer network, and there are two types of participants: those who generate transactions and "spend coins" and those who gather and record these operations.

To incentivize the processing nodes, the system rewards them with new brand new coins. so they not only do record keeping but also "make currency."

How technology works

Because of the intended strong analogy to precious metal mining, these particular nodes are called "miners."

This can appear trivial, but keep in mind that when you send something digital – a music file, or written document or picture — you are always making copies. Moreover, although, is not a real problem with files, is a big, big problem with digital currencies.


For a digital currency to work it is crucial that once you give it to someone, the money is not in your possession anymore, and you cannot give this same money to someone else.

This does not happen with wire transfers, for instance, because the financial institutions record and share a ledger of all the money that enters and exits their systems.

However, that is a centralized solution that depends that you trust an organization always to keep their "word."

The real process

Every transaction made in the Bitcoin network is directed to a pending transaction list. The transaction itself is a simple message that senders sign with a cryptographic key with an amount, as well as the sender's and recipient's addresses.
  • A node authenticates and integrates these transactions in the blockchain. 
  • It is useful to recall that every block references the block that came before. 
  • The new block has to have a hash value that equals all data it is trying to add to the chain, PLUS all data already stored in past blocks of the blockchain. 

Top blockchain books

Since the subsequent hashes are always dependent on the previous, that makes the blockchain tamper-proof. Remember that for anyone to change any value – even a single bit – in the already calculated block, means that he would need to update the hashes of every subsequent block.

This is heavily time-consuming and makes it harder to modify past blocks of Blockchain. The deeper the block down the "height," the more difficult.

How secure is it?

  1. The records on a blockchain are secured through cryptography. 
  2. Network participants have their own private keys that are assigned to the transactions they make and act as a personal digital signature. If a record is altered, the signature will become invalid and the peer network will know right away that something has happened. 
  3. Early notification is crucial to preventing further damage.

Blockchain Resources

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Hyperledger Fabric Real Interview Questions Read Today

I am practicing Hyperledger. This is one of the top listed blockchains. This architecture follows R3 Corda specifications. Sharing the interview questions with you that I have prepared for my interview.

Though Ethereum leads in the real-time applications. The latest Hyperledger version is now ready for production applications. It has now become stable for production applications.
The Hyperledger now backed by IBM. But, it is still an open source. These interview questions help you to read quickly. The below set of interview questions help you like a tutorial on Hyperledger fabric. Hyperledger Fabric Interview Questions1). What are Nodes?
In Hyperledger the communication entities are called Nodes.

2). What are the three different types of Nodes?
- Client Node
- Peer Node
- Order Node
The Client node initiates transactions. The peer node commits the transaction. The order node guarantees the delivery.

3). What is Channel?
A channel in Hyperledger is the subnet of the main blockchain. You c…