hl-fabric-operator

README

Kubernetes Operator for Hyperledger Fabric

• What is this?
• Who made this?
• License
• Requirements
• Quick start
• Overview
  • Strawman
  • CRD
  • CLI
• State machine
• Network architecture
• Go over the samples
  • Simple
  • Simple Raft-TLS
  • Scaled Raft-TLS
  • Scaled Kafka
  • Updating chaincodes
  • Updating channels
  • Adding new peer organizations
  • Adding new peers to organizations
• Trouble shooting
  • Important remarks
• Known issues
• Conclusion

What is this?

This repository contains a Kubernetes Operator to:

• Configure and launch the whole HL Fabric network or part of it, either:
  • A simple one, one peer per organization and Solo orderer
  • Or scaled up one, multiple peers per organization and Kafka or Raft orderer
• Populate the network declaratively:
  • Create the channels, join peers to channels, update channels for Anchor peers
  • Install/Instantiate all chaincodes, or some of them, or upgrade them to newer version
• Add new peer organizations to an already running network declaratively

HL Fabric operator is a wrapper around our previous work PIVT Helm charts and makes running and operating Hyperledger Fabric in Kubernetes even more easier.

Not all functionality provided by PIVT Helm charts are covered, but HL Fabric operator is completely compatible with PIVT Helm charts. This means any uncovered functionality can still be utilized by directly using PIVT Helm charts.

Who made this?

This is made by the original author of PIVT Helm charts; Hakan Eryargi (a.k.a. r a f t).

This work started as an experimental/PoC hobby project but turned out to be quite complete and functional.

License

This work is licensed under the same license with HL Fabric; Apache License 2.0.

Requirements

• A running Kubernetes cluster, Minikube should also work, but not tested
• Argo Controller 2.4.0+ (Argo CLI is not needed but can be handy for debugging)
• Minio, only required for adding new peer organizations
• AWS EKS users please also apply this fix

Quick start

Please refer to release notes for installing the operator and the CLI.

Overview

Strawman

Below is the strawman diagram for HL Fabric Operator:

CRD

FabricNetwork CRD (Custom Resource Definition) spec consists of four sections:

Top level

Here the sources of configtx, chaincode, genesis block and crypto material are defined. They can be either Kubernetes Secrets and/or ConfigMaps or references to local file system. References to local file system is only possible when using CLI tool.

hostAliases is provided for communication with external peers/orderers. If useActualDomains is true, Fabric Operator will still create internal hostAliases and append to this one.

forceState forces the Fabric Operator to set the the state of FabricNetwork to given state and continue. See Trouble shooting section for how to use.

  # source of the configtx.yaml file. either a Kubernetes Secret or a file.
  configtx:
    file: configtx.yaml # see CLI for usage
    # secret: hlf-configtx.yaml

  chaincode:
    version: "1.0"
    language: node
    folder: ../chaincode # see CLI for usage
    # configMaps: implied list

  # source of the genesis block. either a Kubernetes Secret or a file.
  # if none provided Fabric Operator will create the genesis block
  genesis: {}
    # file: # see CLI for usage
    # secret: hlf-genesis.block

  # source of the crypto materials. either a Kubernetes Secret or a folder.
  # if none provided Fabric Operator will create the crypto materials via cryptogen tool.
  # the secret contains TAR archived crypto material
  crypto-config: {}
    # folder: ./crypto-config
    # secret: hlf-crypto-config

  # adds additional DNS entries to /etc/hosts files of pods
  # this is provided for communication with external peers/orderers
  # if useActualDomains is true, Fabric Operator will still create internal hostAliases and append to this one
  hostAliases: 
  
  # forces Fabric Operator to set the the state of FabricNetwork to given state and continue. 
  # use with caution. see troubleshooting section for how to use.
  forceState: 

Topology

Topology of the Fabric network managed by Fabric Operator. This part also contains some top level properties which is applied to whole network. crypto-config.yaml is derived from this part.

  # topology of the Fabric network managed by Fabric Operator
  # also contains some top level properties which is applied to whole network
  topology:
    # Hyperledger Fabric Version
    version: 1.4.9  
    # TLS enabled?
    tlsEnabled: true
    # use actual domain names like peer0.atlantis.com instead of internal service names
    useActualDomains: true

    # Orderer and Peer organizations topology
    # crypto-config.yaml will be derived from this part
    ordererOrgs:
      - name: Pivt
        domain: pivt.nl
        hosts:
          - orderer0
    peerOrgs:
      - name: Karga
        domain: aptalkarga.tr
        peerCount: 1
      - name: Nevergreen
        domain: nevergreen.nl
        peerCount: 1
      - name: Atlantis
        domain: atlantis.com
        peerCount: 1

Network

This part defines how network is populated regarding channels and chaincodes. This part is identical to network.yaml in PIVT Helm charts.

  network:
    # used to create genesis block and by peer-org-flow to parse consortiums
    genesisProfile: OrdererGenesis
    # used to create genesis block 
    systemChannelID: testchainid

    # defines which organizations will join to which channels
    channels:
      - name: common
        # all peers in these organizations will join the channel
        orgs: [Karga, Nevergreen, Atlantis]
      - name: private-karga-atlantis
        # all peers in these organizations will join the channel
        orgs: [Karga, Atlantis]

    # defines which chaincodes will be installed to which organizations
    chaincodes:
      - name: very-simple
        # if defined, this will override the global chaincode.version value
        # version: # "2.0" 
        # chaincode will be installed to all peers in these organizations
        orgs: [Karga, Nevergreen, Atlantis]
        # at which channels are we instantiating/upgrading chaincode?
        channels:
        - name: common
          # chaincode will be instantiated/upgraded using the first peer in the first organization
          # chaincode will be invoked on all peers in these organizations
          orgs: [Karga, Nevergreen, Atlantis]
          policy: OR('KargaMSP.member','NevergreenMSP.member','AtlantisMSP.member')
          
      - name: even-simpler
        # if defined, this will override the global chaincode.language value
        language: golang
        orgs: [Karga, Atlantis]
        channels:
        - name: private-karga-atlantis
          orgs: [Karga, Atlantis]
          policy: OR('KargaMSP.member','AtlantisMSP.member')

Additional settings

This part contains additional settings passed to relevant PIVT Helm charts. See each chart's values.yaml file for details.

  hlf-kube: 
    peer:
      docker:
        dind: 
          # use a side car docker in docker container? required for Kubernetes versions 1.19+ 
          enabled: true
  channel-flow: {}
  chaincode-flow: {}
  peer-org-flow: {}

CLI

Fabric Operator CLI is a supplementary tool for interacting with Fabric Operator.

It’s not required for normal operation of Fabric Operator but provided as a tool for convenience.

It performs client-side validation and creates necessary resources in Kubernetes on the fly.

By using CLI, it's possible to specify supplementary inputs as references to the local file system. For example if chaincode.folder is provided in the FabricNetwork CRD like below, CLI will create chaincode ConfigMaps before submitting the FabricNetwork to Kubernetes.

chaincode:
  folder: ../chaincode

CLI uses local kubectl settings: it uses KUBECONFIG environment variable if set, otherwise it uses ~/.kube/config.

Many CLI commands use the same semantics with kubectl. For example:

-n, --namespace string
-A, --all-namespaces

State machine

Below diagram shows the state machine of HL Fabric Operator:

Network architecture

Please refer to Network Architecture section in the PIVT repo.

Go over samples

Samples provided assumes CLI tool is used. All samples are based on the samples of PIVT Helm charts.

Simple

A solo orderer network with one peer per organization.

Launch the network:

rfabric create samples/simple/fabric-network.yaml

Output:

created configtx Secret hlf-configtx.yaml
created chaincode ConfigMap hlf-chaincode--very-simple
created chaincode ConfigMap hlf-chaincode--even-simpler
created new FabricNetwork simple in namespace default

So what happened? CLI noticed the references to configtx and chaincodes are local file system references, it created the relevant Secret and ConfigMaps, updated the FabricNetwork to use the created Secret/ConfigMaps and submitted to Kubernetes.

Fabric operator will now create a Helm release for hlf-kube, wait until it's ready, then will start channel Argo flow, wait until it's completed, then will start chaincode Argo flow, wait until it's completed, then FabricNetwork will be ready.

Watch the process by either:

kubectl get FabricNetwork simple -o yaml --watch

or

watch rfabric list

You will see the FabricNetwork will go over a couple of states:

New
HelmChartInstalled
HelmChartReady
ChannelFlowSubmitted
ChannelFlowCompleted
ChaincodeFlowSubmitted
ChaincodeFlowCompleted
Ready

Congratulations! You now have a running HL Fabric network in Kubernetes! Channels created, peer orgs joined to channels and chaincodes are installed and instantiated.

Delete the FabricNetwork and all resources:

rfabric delete simple

Simple Raft-TLS

A one organization Raft orderer network with one peer per organization.

rfabric create samples/simple-raft-tls/fabric-network.yaml

Watch the process by either:

kubectl get FabricNetwork simple-raft-tls -o yaml --watch

or

watch rfabric list

This time FabricNetwork will go over slightly different states:

New
HelmChartInstalled
HelmChartNeedsUpdate -> New step
HelmChartReady
ChannelFlowSubmitted
ChannelFlowCompleted
ChaincodeFlowSubmitted
ChaincodeFlowCompleted
Ready

This time Fabric operator noticed useActualDomains is set to true, so it first created the Helm release for hlf-kube, then collected hostAliases and then updated the Helm release with the hostAliases. The next steps remains the same. It will start channel Argo flow, wait until it's completed, then will start chaincode Argo flow, wait until it's completed, then FabricNetwork will be ready.

Congratulations! You now have a running HL Fabric network in Kubernetes with Raft orderer and TLS is enabled! Channels created, peer orgs joined to channels and chaincodes are installed and instantiated.

Delete the FabricNetwork and all resources:

rfabric delete simple-raft-tls

Scaled Raft-TLS

Scaled up network based on three Raft orderer nodes spanning two Orderer organizations and two peers per organization.

rfabric create samples/scaled-raft-tls/fabric-network.yaml

Same as Simple Raft-TLS sample. It will go over the same steps.

Delete the FabricNetwork and all resources:

rfabric delete scaled-raft-tls

Scaled Kafka

Scaled up network based on three Kafka orderer nodes and two peers per organization.

rfabric create samples/scaled-kafka/fabric-network.yaml

This will also launch Kafka and Zookeeper pods because of the setting passed to hlf-kube Helm chart:

  hlf-kube: 
    hlf-kafka:
      enabled: true

See hlf-kube Helm chart's values.yaml for further configuration options of Kafka and Zookeper pods.

Delete the FabricNetwork and all resources:

rfabric delete scaled-kafka

Updating chaincodes

Launch any of the samples above and wait until they are ready.

Let's assume you have updated the chaincode source codes. You can actually update them anyway.

Update the top level chaincode version to 2.0.

  chaincode:
    version: "2.0"

Then update the FabricNetwork with CLI:

rfabric update samples/simple/fabric-network.yaml

Fabric Operator will start the chaincode Argo flow and both chaincodes will be updated to version 2.0.

You can also update individuals chaincodes. For example, below change will only update chaincode very-simple to version 3.0.

    chaincodes:
      - name: very-simple
        version: "3.0" 

Updating channels

Let's create another channel called common-2.

Add the below profile to configtx.yaml:

    common-2:
        Consortium: TheConsortium
        <<: *ChannelDefaults
        Application:
            <<: *ApplicationDefaults
            Organizations:
                - *Karga
                - *Nevergreen
                - *Atlantis

And below to channels part of FabricNetwork CRD:

    channels:
      - name: common-2
        # all peers in these organizations will join the channel
        orgs: [Karga, Nevergreen, Atlantis]

Then update the FabricNetwork with CLI:

rfabric update samples/simple/fabric-network.yaml

Fabric Operator will start the channel Argo flow which will create the channel common-2 and add all peers in the mentioned organizations to channel common-2.

Adding new peer organizations

To add new peer organizations, you need to configure Argo to use some artifactory. Minio is the simplest way. Please make sure you can run an Argo provided artifact sample before proceeding.

First launch the simple network and wait until it's ready:

rfabric create samples/simple/fabric-network.yaml

Then update the FabricNetwork with the provided extended definition.

rfabric update samples/simple/extended/fabric-network.yaml

Fabric Operator will start the peer-org Argo flow which will add missing organizations to consortiums and add missing organizations to existing channels as defined in network section. Then channel Argo flow will be started and create missing channels. And finally chaincode Argo flow will be run.

See the adding new peer organizations section in PIVT Helm charts repo for details.

Note, if you are not running the majority of organizations and policy requires majority, adding new peer organizations will fail. However, you can still use Fabric Operator to do the heavy lifting:

• You can make Fabric Operator prepare and sign config updates for both user and orderer channels but prevent sending the update to orderer nodes (So, you can send config updates to other parties and they can proceed)
• You can make Fabric Operator start from provided signed config updates
• Or you can do both

See the extending cross cluster raft orderer network sub section in PIVT Helm charts repo for details.

You can extend the Raft and Kafka orderer networks in the same way. But in Raft orderer networks, (more precisely if useActualDomains is true) persistence should be enabled. The pods will restart due to update of hostAliases and they will lose all data if persistence is not enabled.

Adding new peers to organizations

Just increase the peerCount in the topology section and make an update.

    peerOrgs:
      - name: Karga
        domain: aptalkarga.tr
        peerCount: 2 # --> Increase this one

Trouble shooting

When something goes wrong, logs are your best friend.

If it's Argo workflow failing, you can check details with argo logs <workflow-name> [pod-name] command.

Fabric Operator does not re-submit Argo workflows if they fail, since:

• The retry mechanism is baked into Argo workflows, guarding the flows against temporary failures: example
• Otherwise, if the underlying issue is not resolved, re-submitting the Argo workflow will just consume cluster resources for nothing

Fix the issue, and force the Fabric Operator to continue by setting the forceState field in the FabricNetwork. Use with caution this option. See the state-machine for how to use this feature.

For example, you can force channel-flow run again by setting forceState to HelmChartReady:

forceState: HelmChartReady

Or force chaincode-flow run again by setting forceState to ChannelFlowCompleted:

forceState: ChannelFlowCompleted

Remember, if you are stuck, any time you can use Fabric tools or PIVT Helm charts directly to fix the issue and set forceState to Ready:

forceState: Ready

Important remarks

When persistance is enabled for any component, deleting the FabricNetwork with CLI or deleting the Helm chart directly, will NOT delete PersistentVolumeClaims. This can result in unexpected behaviour, like orderer nodes cannot initiliaze correctly or cannot elect a leader.

So, make sure you delete the relevant PersistentVolumeClaims after deleting a FabricNetwork.

Known issues

None for now.

Conclusion

So happy BlockChaining in Kubernetes :)

And don't forget the first rule of BlockChain club:

"Do not use BlockChain unless absolutely necessary!"

Hakan Eryargi (r a f t)