What is blockfile_000000 Blockfiles of Blockchain?

Blocks of a blockchain are stored in physical files. Since they are very static once created, there is no need to store them in database.

Hyperledger Fabric combines multiple blocks into a single blockfile, and stores it in the /var/hyperledger/production/ledgersData/chains/chains directory on the peer container.

Since each channel has its own block, blockfiles are stored in sub-directories, one per channel. You can view and download blockfiles as shown below.

$ docker exec peer0.org1.example.com ls -l 
   /var/hyperledger/production/ledgersData/chains/chains/mychannel
-rw-r----- 1 root root 31232 Apr  1 16:11 blockfile_000000

$ docker cp peer0.org1.example.com:\
   /var/hyperledger/production/ledgersData/chains/chains/mychannel\
   blockfile_000000 .
   
$ more blockfile_000000

...
OrdererMSP-----BEGIN CERTIFICATE-----
MIICDDCCAbOgAwIBAgIRAK30hdRcBxQJYNPqPkiFo3IwCgYIKoZIzj0EAwIwaTEL
MAkGA1UEBhMCVVMxEzARBgNVBAgTCkNhbGlmb3JuaWExFjAUBgNVBAcTDVNhbiBG
...

As you can see, the blockfile is also in binary format, you need a tool to parse it.

 

⇒ Setup Node.js for WYFA Tests

⇐ Read Block Data in Blockchain

⇑ WYFA (Writing Your First Application)

⇑⇑ Hyperledger Tutorials