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1 .Challenges and Solutions of
Using Kubernetes for
Blockchain Applications
2 .Blockchain Technology
Blockchain can do for business what the internet did for communication
Every second of every day, businesses exchange value with suppliers,
partners, customers and others. By value, we mean goods, services, money,
data and more.
Each exchange of value is a transaction. Successful transactions need to be
fast, precise and easily agreed on by parties participating in the transaction.
Blockchain for business provides a way to execute many more of these
transactions — a much better way.
-- ibm.com
3 .What is unique about blockchain?
• Decentralized, shared, tamper-evident
ledger — once recorded, transactions
cannot be altered
• All parties must give consensus before a
new transaction is added to the ledger
4 .Differences of Chains
• Transaction visibility
• Public/Open
• Private/Permissioned
• Consensus methods
• PoW (Work)
• PoS (Stake)
• PoET (Elapsed Time by intel)
• PoA (Authority)
5 .Hyperledger Fabric
• One of the 10 Hyperledger projects
• Open source
• Permission based
• Consortium
• Consensus (PoA like)
• Orderering service
• Components are containerized & available on
Docker Hub
• Repo https://github.com/hyperledger/fabric
• To try, use Fabric Cello, Ansible Agent
6 .Why use K8S for fabric
• Fabric was designed & developed to run in a
container environment from very beginning
• Fabric network is decentralized like any other
blockchain networks, you can stand up your own
nodes anywhere in the world, then join the
network with permission
• Start up small, then scale up or down when you
want to for the resources such as CPU, Memory
and storage.
7 .Challenges & Solutions - 1
Getting a k8s cluster from different vendors differ
8 .Challenges & Solutions - 2
Getting the kubeconfig file is where things really going
dramatically different.
• Download link
• Vendor specific client tool instead of kubectl
• Manual copy/paste
9 .Challenges & Solutions - 3
Persistent volume capabilities
Access Modes:
ReadWriteOnce
ReadOnlyMany
ReadWriteMany
Setup your own Persistent Class for your own
app
10 .Challenges & Solutions - 4
Finding Pods using their names - DNS search and
communication
Solution: Use service
11 .Challenges & Solutions - 5
K8S Dashboard access, from easy to somewhat so weird
approaches,
Link after provision
Proxy
No user interface, all command line
12 .Challenges & Solutions - 6
Docker issues
• Docker in docker issue
• Container side-by-side requirement from app
using daemon set to create dind container for endpoint.
13 .Challenges & Solutions - 7
Application deployment
• Sequence control
• For an application, there can be many services,
how the services depend on each other, what is the
start up sequence, in many applications, it is quite
important
Solution: Use deployment tools such as Ansible or
InitContainer (may not work in some cases)
14 .Good news
K8S conformance program
• Not only from API perspective, but also from
usability perspective
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