Version: 3.5 (unsupported)

Getting Started with Helm Charts (ScalarDL Ledger and Auditor / Auditor mode)

This document explains how to get started with ScalarDL Ledger and Auditor using Helm Chart on a Kubernetes cluster as a test environment. Here, we assume that you already have a Mac or Linux environment for testing. We use Minikube in this document, but the steps we will show should work in any Kubernetes cluster.

Requirement

You need to subscribe to ScalarDL Ledger and ScalarDL Auditor in the AWS Marketplace or Azure Marketplace to get the following container images.

AWS Marketplace
- scalar-ledger
- scalar-ledger-envoy
- scalardl-schema-loader-ledger
- scalar-auditor
- scalar-auditor-envoy
- scalardl-schema-loader-auditor
Azure Marketplace
- scalar-ledger
- scalar-auditor
- scalardl-envoy
- scalardl-schema-loader

Please refer to the following documents for more details.

Note

To make Byzantine fault detection with auditing work properly, Ledger and Auditor should be deployed and managed in different administrative domains. However, in this guide, we will deploy Ledger and Auditor in the same Kubernetes cluster to make the test easier.

What we create

We will deploy the following components on a Kubernetes cluster as follows.

+-----------------------------------------------------------------------------------------------------------------------------+
| [Kubernetes Cluster]                                                                                                        |
|                                             [Pod]                                      [Pod]                   [Pod]        |
|                                                                                                                             |
|                                           +-------+                                 +---------+                             |
|                                     +---> | Envoy | ---+                      +---> | Ledger  | ---+                        |
|                                     |     +-------+    |                      |     +---------+    |                        |
|                                     |                  |                      |                    |                        |
|                      +---------+    |     +-------+    |     +-----------+    |     +---------+    |     +---------------+  |
|                +---> | Service | ---+---> | Envoy | ---+---> |  Service  | ---+---> | Ledger  | ---+---> |  PostgreSQL   |  |
|                |     | (Envoy) |    |     +-------+    |     | (Ledger)  |    |     +---------+    |     | (For Ledger)  |  |
|                |     +---------+    |                  |     +-----------+    |                    |     +---------------+  |
|                |                    |     +-------+    |                      |     +---------+    |                        |
|                |                    +---> | Envoy | ---+                      +---> | Ledger  | ---+                        |
|  +--------+    |                          +-------+                                 +---------+                             |
|  | Client | ---+                                                                                                            |
|  +--------+    |                          +-------+                                 +---------+                             |
|                |                    +---> | Envoy | ---+                      +---> | Auditor | ---+                        |
|                |                    |     +-------+    |                      |     +---------+    |                        |
|                |                    |                  |                      |                    |                        |
|                |     +---------+    |     +-------+    |     +-----------+    |     +---------+    |     +---------------+  |
|                +---> | Service | ---+---> | Envoy | ---+---> |  Service  | ---+---> | Auditor | ---+---> |  PostgreSQL   |  |
|                      | (Envoy) |    |     +-------+    |     | (Auditor) |    |     +---------+    |     | (For Auditor) |  |
|                      +---------+    |                  |     +-----------+    |                    |     +---------------+  |
|                                     |     +-------+    |                      |     +---------+    |                        |
|                                     +---> | Envoy | ---+                      +---> | Auditor | ---+                        |
|                                           +-------+                                 +---------+                             |
|                                                                                                                             |
+-----------------------------------------------------------------------------------------------------------------------------+

Step 1. Start a Kubernetes cluster

First, you need to prepare a Kubernetes cluster. If you use a minikube environment, please refer to the Getting Started with Scalar Helm Charts. If you have already started a Kubernetes cluster, you can skip this step.

Step 2. Start PostgreSQL containers

ScalarDL Ledger and Auditor use some kind of database system as a backend database. In this document, we use PostgreSQL.

You can deploy PostgreSQL on the Kubernetes cluster as follows.

Add the Bitnami helm repository.

helm repo add bitnami https://charts.bitnami.com/bitnami

Deploy PostgreSQL for Ledger.

helm install postgresql-ledger bitnami/postgresql \
  --set auth.postgresPassword=postgres \
  --set primary.persistence.enabled=false

Deploy PostgreSQL for Auditor.

helm install postgresql-auditor bitnami/postgresql \
  --set auth.postgresPassword=postgres \
  --set primary.persistence.enabled=false

Check if the PostgreSQL containers are running.

kubectl get pod

[Command execution result]

NAME                   READY   STATUS    RESTARTS   AGE
postgresql-auditor-0   1/1     Running   0          11s
postgresql-ledger-0    1/1     Running   0          16s

Step 3. Create a working directory

We will create some configuration files and key/certificate files locally. So, create a working directory for them.

Create a working directory.
```
mkdir -p ~/scalardl-test/certs/
```

Step 4. Create key/certificate files

Note: In this guide, we will use self-sign certificates for the test. However, it is strongly recommended that these certificates NOT be used in production.

Change the working directory to ~/scalardl-test/certs/ directory.
```
cd ~/scalardl-test/certs/
```

Create a JSON file that includes Ledger information.

cat << 'EOF' > ~/scalardl-test/certs/ledger.json
{
    "CN": "ledger",
    "hosts": ["example.com","*.example.com"],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "O": "ledger",
            "OU": "test team",
            "L": "Shinjuku",
            "ST": "Tokyo",
            "C": "JP"
        }
    ]
}
EOF

Create a JSON file that includes Auditor information.

cat << 'EOF' > ~/scalardl-test/certs/auditor.json
{
    "CN": "auditor",
    "hosts": ["example.com","*.example.com"],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "O": "auditor",
            "OU": "test team",
            "L": "Shinjuku",
            "ST": "Tokyo",
            "C": "JP"
        }
    ]
}
EOF

Create a JSON file that includes Client information.

cat << 'EOF' > ~/scalardl-test/certs/client.json
{
    "CN": "client",
    "hosts": ["example.com","*.example.com"],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "O": "client",
            "OU": "test team",
            "L": "Shinjuku",
            "ST": "Tokyo",
            "C": "JP"
        }
    ]
}
EOF

Create key/certificate files for the Ledger.

cfssl selfsign "" ./ledger.json | cfssljson -bare ledger

Create key/certificate files for the Auditor.

cfssl selfsign "" ./auditor.json | cfssljson -bare auditor

Create key/certificate files for the Client.

cfssl selfsign "" ./client.json | cfssljson -bare client

Confirm key/certificate files are created.

ls -1

[Command execution result]

auditor-key.pem
auditor.csr
auditor.json
auditor.pem
client-key.pem
client.csr
client.json
client.pem
ledger-key.pem
ledger.csr
ledger.json
ledger.pem

Step 5. Create DB schemas for ScalarDL Ledger using Helm Charts

We will deploy two ScalarDL Schema Loader pods on the Kubernetes cluster using Helm Charts.
The ScalarDL Schema Loader will create the DB schemas for ScalarDL Ledger and Auditor in PostgreSQL.

Change the working directory to ~/scalardl-test/.
```
cd ~/scalardl-test/
```

Add the Scalar helm repository.

helm repo add scalar-labs https://scalar-labs.github.io/helm-charts

Create a secret resource to pull the ScalarDL container images from AWS/Azure Marketplace.

AWS Marketplace

kubectl create secret docker-registry reg-ecr-mp-secrets \
  --docker-server=709825985650.dkr.ecr.us-east-1.amazonaws.com \
  --docker-username=AWS \
  --docker-password=$(aws ecr get-login-password --region us-east-1)

Azure Marketplace

kubectl create secret docker-registry reg-acr-secrets \
  --docker-server=<your private container registry login server> \
  --docker-username=<Service principal ID> \
  --docker-password=<Service principal password>

Please refer to the following documents for more details.

Create a custom values file for ScalarDL Schema Loader for Ledger (schema-loader-ledger-custom-values.yaml).

AWS Marketplace

cat << 'EOF' > ~/scalardl-test/schema-loader-ledger-custom-values.yaml
schemaLoading:
  schemaType: "ledger"
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalardl-schema-loader-ledger"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"
  databaseProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
  secretName: "ledger-credentials-secret"
EOF

Azure Marketplace

cat << 'EOF' > ~/scalardl-test/schema-loader-ledger-custom-values.yaml
schemaLoading:
  schemaType: "ledger"
  image:
    repository: "<your private container registry>/scalarinc/scalardl-schema-loader"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"
  databaseProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
  secretName: "ledger-credentials-secret"
EOF

Create a custom values file for ScalarDL Schema Loader for Auditor (schema-loader-auditor-custom-values.yaml).

AWS Marketplace

cat << 'EOF' > ~/scalardl-test/schema-loader-auditor-custom-values.yaml
schemaLoading:
  schemaType: "auditor"
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalardl-schema-loader-auditor"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"
  databaseProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
  secretName: "auditor-credentials-secret"
EOF

Azure Marketplace

cat << 'EOF' > ~/scalardl-test/schema-loader-auditor-custom-values.yaml
schemaLoading:
  schemaType: "auditor"
  image:
    repository: "<your private container registry>/scalarinc/scalardl-schema-loader"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"
  databaseProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
  secretName: "auditor-credentials-secret"
EOF

Create a secret resource that includes a username and password for PostgreSQL for Ledger.

kubectl create secret generic ledger-credentials-secret \
  --from-literal=SCALAR_DL_LEDGER_POSTGRES_USERNAME=postgres \
  --from-literal=SCALAR_DL_LEDGER_POSTGRES_PASSWORD=postgres

Create a secret resource that includes a username and password for PostgreSQL for Auditor.

kubectl create secret generic auditor-credentials-secret \
  --from-literal=SCALAR_DL_AUDITOR_POSTGRES_USERNAME=postgres \
  --from-literal=SCALAR_DL_AUDITOR_POSTGRES_PASSWORD=postgres

Deploy the ScalarDL Schema Loader for Ledger.

helm install schema-loader-ledger scalar-labs/schema-loading -f ./schema-loader-ledger-custom-values.yaml

Deploy the ScalarDL Schema Loader for Auditor.

helm install schema-loader-auditor scalar-labs/schema-loading -f ./schema-loader-auditor-custom-values.yaml

Check if the ScalarDL Schema Loader pods are deployed and completed.

kubectl get pod

[Command execution result]

NAME                                         READY   STATUS      RESTARTS   AGE
postgresql-auditor-0                         1/1     Running     0          2m56s
postgresql-ledger-0                          1/1     Running     0          3m1s
schema-loader-auditor-schema-loading-dvc5r   0/1     Completed   0          6s
schema-loader-ledger-schema-loading-mtllb    0/1     Completed   0          10s

If the ScalarDL Schema Loader pods are ContainerCreating or Running, wait for the process will be completed (The STATUS will be Completed).

Step 6. Deploy ScalarDL Ledger and Auditor on the Kubernetes cluster using Helm Charts

Create a custom values file for ScalarDL Ledger (scalardl-ledger-custom-values.yaml).

AWS Marketplace

cat << 'EOF' > ~/scalardl-test/scalardl-ledger-custom-values.yaml
envoy:
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalar-ledger-envoy"
    version: "1.3.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"

ledger:
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalar-ledger"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"
  ledgerProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
    scalar.dl.ledger.proof.enabled=true
    scalar.dl.ledger.auditor.enabled=true
    scalar.dl.ledger.proof.private_key_path=/keys/private-key
  secretName: "ledger-credentials-secret"
  extraVolumes:
    - name: "ledger-keys"
      secret:
        secretName: "ledger-keys"
  extraVolumeMounts:
    - name: "ledger-keys"
      mountPath: "/keys"
      readOnly: true
EOF

Azure Marketplace

cat << 'EOF' > ~/scalardl-test/scalardl-ledger-custom-values.yaml
envoy:
  image:
    repository: "<your private container registry>/scalarinc/scalardl-envoy"
    version: "1.3.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"

ledger:
  image:
    repository: "<your private container registry>/scalarinc/scalar-ledger"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"
  ledgerProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_LEDGER_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
    scalar.dl.ledger.proof.enabled=true
    scalar.dl.ledger.proof.private_key_path=/keys/private-key
  secretName: "ledger-credentials-secret"
  extraVolumes:
    - name: "ledger-keys"
      secret:
        secretName: "ledger-keys"
  extraVolumeMounts:
    - name: "ledger-keys"
      mountPath: "/keys"
      readOnly: true
EOF

Create a custom values file for ScalarDL Auditor (scalardl-auditor-custom-values.yaml).

AWS Marketplace

cat << 'EOF' > ~/scalardl-test/scalardl-auditor-custom-values.yaml
envoy:
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalar-auditor-envoy"
    version: "1.3.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"

auditor:
  image:
    repository: "709825985650.dkr.ecr.us-east-1.amazonaws.com/scalar/scalar-auditor"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-ecr-mp-secrets"
  auditorProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
    scalar.dl.auditor.ledger.host=scalardl-ledger-envoy.default.svc.cluster.local
    scalar.dl.auditor.cert_path=/keys/certificate
    scalar.dl.auditor.private_key_path=/keys/private-key
  secretName: "auditor-credentials-secret"
  extraVolumes:
    - name: "auditor-keys"
      secret:
        secretName: "auditor-keys"
  extraVolumeMounts:
    - name: "auditor-keys"
      mountPath: "/keys"
      readOnly: true
EOF

Azure Marketplace

cat << 'EOF' > ~/scalardl-test/scalardl-auditor-custom-values.yaml
envoy:
  image:
    repository: "<your private container registry>/scalarinc/scalardl-envoy"
    version: "1.3.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"

auditor:
  image:
    repository: "<your private container registry>/scalarinc/scalar-auditor"
    version: "3.6.0"
  imagePullSecrets:
    - name: "reg-acr-secrets"
  auditorProperties: |
    scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
    scalar.db.username={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_USERNAME "" }}
    scalar.db.password={{ default .Env.SCALAR_DL_AUDITOR_POSTGRES_PASSWORD "" }}
    scalar.db.storage=jdbc
    scalar.dl.auditor.ledger.host=scalardl-ledger-envoy.default.svc.cluster.local
    scalar.dl.auditor.cert_path=/keys/certificate
    scalar.dl.auditor.private_key_path=/keys/private-key
  secretName: "auditor-credentials-secret"
  extraVolumes:
    - name: "auditor-keys"
      secret:
        secretName: "auditor-keys"
  extraVolumeMounts:
    - name: "auditor-keys"
      mountPath: "/keys"
      readOnly: true
EOF

Create secret resource ledger-keys.

kubectl create secret generic ledger-keys --from-file=certificate=./certs/ledger.pem --from-file=private-key=./certs/ledger-key.pem

Create secret resource auditor-keys.

kubectl create secret generic auditor-keys --from-file=certificate=./certs/auditor.pem --from-file=private-key=./certs/auditor-key.pem

Deploy the ScalarDL Ledger.

helm install scalardl-ledger scalar-labs/scalardl -f ./scalardl-ledger-custom-values.yaml

Deploy the ScalarDL Auditor.

helm install scalardl-auditor scalar-labs/scalardl-audit -f ./scalardl-auditor-custom-values.yaml

Check if the ScalarDL Ledger and Auditor pods are deployed.

kubectl get pod

[Command execution result]

NAME                                         READY   STATUS      RESTARTS   AGE
postgresql-auditor-0                         1/1     Running     0          14m
postgresql-ledger-0                          1/1     Running     0          14m
scalardl-auditor-auditor-5b885ff4c8-fwkpf    1/1     Running     0          18s
scalardl-auditor-auditor-5b885ff4c8-g69cb    1/1     Running     0          18s
scalardl-auditor-auditor-5b885ff4c8-nsmnq    1/1     Running     0          18s
scalardl-auditor-envoy-689bcbdf65-5mn6v      1/1     Running     0          18s
scalardl-auditor-envoy-689bcbdf65-fpq8j      1/1     Running     0          18s
scalardl-auditor-envoy-689bcbdf65-lsz2t      1/1     Running     0          18s
scalardl-ledger-envoy-547bbf7546-n7p5x       1/1     Running     0          26s
scalardl-ledger-envoy-547bbf7546-p8nwp       1/1     Running     0          26s
scalardl-ledger-envoy-547bbf7546-pskpb       1/1     Running     0          26s
scalardl-ledger-ledger-6db5dc8774-5zsbj      1/1     Running     0          26s
scalardl-ledger-ledger-6db5dc8774-vnmrw      1/1     Running     0          26s
scalardl-ledger-ledger-6db5dc8774-wpjvs      1/1     Running     0          26s
schema-loader-auditor-schema-loading-dvc5r   0/1     Completed   0          11m
schema-loader-ledger-schema-loading-mtllb    0/1     Completed   0          11m

If the ScalarDL Ledger and Auditor pods are deployed properly, you can see the STATUS are Running.

Check if the ScalarDL Ledger and Auditor services are deployed.

kubectl get svc

[Command execution result]

NAME                             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                         AGE
kubernetes                       ClusterIP   10.96.0.1        <none>        443/TCP                         47d
postgresql-auditor               ClusterIP   10.107.9.78      <none>        5432/TCP                        15m
postgresql-auditor-hl            ClusterIP   None             <none>        5432/TCP                        15m
postgresql-ledger                ClusterIP   10.108.241.181   <none>        5432/TCP                        15m
postgresql-ledger-hl             ClusterIP   None             <none>        5432/TCP                        15m
scalardl-auditor-envoy           ClusterIP   10.100.61.202    <none>        40051/TCP,40052/TCP             55s
scalardl-auditor-envoy-metrics   ClusterIP   10.99.6.227      <none>        9001/TCP                        55s
scalardl-auditor-headless        ClusterIP   None             <none>        40051/TCP,40053/TCP,40052/TCP   55s
scalardl-auditor-metrics         ClusterIP   10.108.1.147     <none>        8080/TCP                        55s
scalardl-ledger-envoy            ClusterIP   10.101.191.116   <none>        50051/TCP,50052/TCP             61s
scalardl-ledger-envoy-metrics    ClusterIP   10.106.52.103    <none>        9001/TCP                        61s
scalardl-ledger-headless         ClusterIP   None             <none>        50051/TCP,50053/TCP,50052/TCP   61s
scalardl-ledger-metrics          ClusterIP   10.99.122.106    <none>        8080/TCP                        61s

If the ScalarDL Ledger and Auditor services are deployed properly, you can see private IP addresses in the CLUSTER-IP column. (Note: scalardl-ledger-headless and scalardl-auditor-headless have no CLUSTER-IP.)

Step 7. Start a Client container

We will use certificate files in a Client container. So, we create a secret resource and mount it to a Client container.

Create secret resource client-keys.

kubectl create secret generic client-keys --from-file=certificate=./certs/client.pem --from-file=private-key=./certs/client-key.pem

Start a Client container on the Kubernetes cluster.

cat << 'EOF' | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: "scalardl-client"
spec:
  containers:
    - name: scalardl-client
      image: eclipse-temurin:8
      command: ['sleep']
      args: ['inf']
      volumeMounts:
        - name: "ledger-keys"
          mountPath: "/keys/ledger"
          readOnly: true
        - name: "auditor-keys"
          mountPath: "/keys/auditor"
          readOnly: true
        - name: "client-keys"
          mountPath: "/keys/client"
          readOnly: true
  volumes:
    - name: "ledger-keys"
      secret:
        secretName: "ledger-keys"
    - name: "auditor-keys"
      secret:
        secretName: "auditor-keys"
    - name: "client-keys"
      secret:
        secretName: "client-keys"
  restartPolicy: Never 
EOF

Check if the Client container is running.

kubectl get pod scalardl-client

[Command execution result]

NAME              READY   STATUS    RESTARTS   AGE
scalardl-client   1/1     Running   0          4s

Step 8. Run ScalarDL sample contracts in the Client container

The following explains the minimum steps. If you want to know more details about ScalarDL Ledger and Auditor, please refer to the following documents.

When you use Auditor, you need to register the certificate for the Ledger and Auditor before starting the client application. Ledger needs to register its certificate to Auditor, and Auditor needs to register its certificate to Ledger.

Run bash in the Client container.
```
kubectl exec -it scalardl-client -- bash
```
After this step, run each command in the Client container.
Install the git, curl and unzip commands in the Client container.
```
apt update && apt install -y git curl unzip
```

Clone ScalarDL Java Client SDK git repository.

git clone https://github.com/scalar-labs/scalardl-java-client-sdk.git

Change the directory to scalardl-java-client-sdk/.
```
cd scalardl-java-client-sdk/
```
```
pwd
```
[Command execution result]
```
/scalardl-java-client-sdk
```
Change branch to arbitrary version.
```
git checkout -b v3.6.0 refs/tags/v3.6.0
```
```
git branch
```
[Command execution result]
```
  master
* v3.6.0
```
If you want to use another version, please specify the version (tag) you want to use. You need to use the same version of ScalarDL Ledger and ScalarDL Java Client SDK.
Build the sample contracts.
```
./gradlew assemble
```
Download CLI tools of ScalarDL from ScalarDL Java Client SDK Releases.
```
curl -OL https://github.com/scalar-labs/scalardl-java-client-sdk/releases/download/v3.6.0/scalardl-java-client-sdk-3.6.0.zip
```
You need to use the same version of CLI tools and ScalarDL Ledger.
Unzip the scalardl-java-client-sdk-3.6.0.zip file.
```
unzip ./scalardl-java-client-sdk-3.6.0.zip
```

Create a configuration file (ledger.as.client.properties) to register the certificate of Ledger to Auditor.

cat << 'EOF' > ledger.as.client.properties
# Ledger
scalar.dl.client.server.host=scalardl-ledger-envoy.default.svc.cluster.local

# Auditor
scalar.dl.client.auditor.enabled=true
scalar.dl.client.auditor.host=scalardl-auditor-envoy.default.svc.cluster.local

# Certificate
scalar.dl.client.cert_holder_id=ledger
scalar.dl.client.cert_path=/keys/ledger/certificate
scalar.dl.client.private_key_path=/keys/ledger/private-key
EOF

Create a configuration file (auditor.as.client.properties) to register the certificate of Auditor to Ledger.

cat << 'EOF' > auditor.as.client.properties
# Ledger
scalar.dl.client.server.host=scalardl-ledger-envoy.default.svc.cluster.local

# Auditor
scalar.dl.client.auditor.enabled=true
scalar.dl.client.auditor.host=scalardl-auditor-envoy.default.svc.cluster.local

# Certificate
scalar.dl.client.cert_holder_id=auditor
scalar.dl.client.cert_path=/keys/auditor/certificate
scalar.dl.client.private_key_path=/keys/auditor/private-key
EOF

Create a configuration file (client.properties) to access ScalarDL Ledger on the Kubernetes cluster.

cat << 'EOF' > client.properties
# Ledger
scalar.dl.client.server.host=scalardl-ledger-envoy.default.svc.cluster.local

# Auditor
scalar.dl.client.auditor.enabled=true
scalar.dl.client.auditor.host=scalardl-auditor-envoy.default.svc.cluster.local

# Certificate
scalar.dl.client.cert_holder_id=client
scalar.dl.client.cert_path=/keys/client/certificate
scalar.dl.client.private_key_path=/keys/client/private-key
EOF

./scalardl-java-client-sdk-3.6.0/bin/register-cert --properties ./ledger.as.client.properties

./scalardl-java-client-sdk-3.6.0/bin/register-cert --properties ./auditor.as.client.properties

./scalardl-java-client-sdk-3.6.0/bin/register-cert --properties ./client.properties

./scalardl-java-client-sdk-3.6.0/bin/register-contract --properties ./client.properties --contract-id StateUpdater --contract-binary-name com.org1.contract.StateUpdater --contract-class-file ./build/classes/java/main/com/org1/contract/StateUpdater.class

./scalardl-java-client-sdk-3.6.0/bin/register-contract --properties ./client.properties --contract-id StateReader --contract-binary-name com.org1.contract.StateReader --contract-class-file ./build/classes/java/main/com/org1/contract/StateReader.class

./scalardl-java-client-sdk-3.6.0/bin/register-contract --properties ./client.properties --contract-id validate-ledger --contract-binary-name com.scalar.dl.client.contract.ValidateLedger --contract-class-file ./build/classes/java/main/com/scalar/dl/client/contract/ValidateLedger.class

Execute the contract StateUpdater.

./scalardl-java-client-sdk-3.6.0/bin/execute-contract --properties ./client.properties --contract-id StateUpdater --contract-argument '{"asset_id": "test_asset", "state": 3}'

This sample contract updates the state (value) of the asset named test_asset to 3.

Execute the contract StateReader.
```
./scalardl-java-client-sdk-3.6.0/bin/execute-contract --properties ./client.properties --contract-id StateReader --contract-argument '{"asset_id": "test_asset"}'
```
[Command execution result]
```
Contract result:
{
  "id" : "test_asset",
  "age" : 0,
  "output" : {
    "state" : 3
  }
}
```
- Reference information
  - If the asset data is not tampered with, the contract execution request (execute-contract command) returns OK as a result.
  - If the asset data is tampered with (e.g. the state value in the DB is tampered with), the contract execution request (execute-contract command) returns a value other than OK (e.g. INCONSISTENT_STATES) as a result, like the following.
    [Command execution result (If the asset data is tampered with)]
    { "status_code" : "INCONSISTENT_STATES", "error_message" : "The results from Ledger and Auditor don't match" }
    - In this way, the ScalarDL can detect data tampering.

Execute a validation request for the asset.

./scalardl-java-client-sdk-3.6.0/bin/validate-ledger --properties ./client.properties --asset-id "test_asset"

[Command execution result]

{
  "status_code" : "OK",
  "Ledger" : {
    "id" : "test_asset",
    "age" : 0,
    "nonce" : "3533427d-03cf-41d1-bf95-4d31eb0cb24d",
    "hash" : "FiquvtPMKLlxKf4VGoccSAGsi9ptn4ozYVVTwdSzEQ0=",
    "signature" : "MEYCIQDiiXqzw6K+Ml4uvn8rK43o5wHWESU3hoXnZPi6/OeKVwIhAM+tFBcapl6zg47Uq0Uc8nVNGWNHZLBDBGve3F0xkzTR"
  },
  "Auditor" : {
    "id" : "test_asset",
    "age" : 0,
    "nonce" : "3533427d-03cf-41d1-bf95-4d31eb0cb24d",
    "hash" : "FiquvtPMKLlxKf4VGoccSAGsi9ptn4ozYVVTwdSzEQ0=",
    "signature" : "MEUCIQDLsfUR2PmxSvfpL3YvHJUkz00RDpjCdctkroZKXE8d5QIgH73FQH2e11jfnynD00Pp9DrIG1vYizxDsvxUsMPo9IU="
  }
}

Reference information
- If the asset data is not tampered with, the validation request (validate-ledger command) returns OK as a result.
- If the asset data is tampered with (e.g. the state value in the DB is tampered with), the validation request (validate-ledger command) returns a value other than OK (e.g. INVALID_OUTPUT) as a result, like the following.
  [Command execution result (If the asset data is tampered with)]
```
{
  "status_code" : "INCONSISTENT_STATES",
  "error_message" : "The results from Ledger and Auditor don't match"
}
```
  - In this way, the ScalarDL Ledger can detect data tampering.

Step 9. Delete all resources

After completing the ScalarDL Ledger tests on the Kubernetes cluster, remove all resources.

Uninstall ScalarDL Ledger, ScalarDL Schema Loader, and PostgreSQL.

helm uninstall scalardl-ledger schema-loader-ledger postgresql-ledger scalardl-auditor schema-loader-auditor postgresql-auditor

Remove the Client container.

kubectl delete pod scalardl-client --force --grace-period 0

Remove the working directory and sample files (configuration file, key, and certificate).
```
cd ~
```
```
rm -rf ~/scalardl-test/
```

Requirement​

Note​

What we create​

Step 1. Start a Kubernetes cluster​

Step 2. Start PostgreSQL containers​

Step 3. Create a working directory​

Step 4. Create key/certificate files​

Step 5. Create DB schemas for ScalarDL Ledger using Helm Charts

Step 6. Deploy ScalarDL Ledger and Auditor on the Kubernetes cluster using Helm Charts​

Step 7. Start a Client container​

Step 8. Run ScalarDL sample contracts in the Client container​

Step 9. Delete all resources​

Further reading​

Requirement

Note

What we create

Step 1. Start a Kubernetes cluster

Step 2. Start PostgreSQL containers

Step 3. Create a working directory

Step 4. Create key/certificate files

Step 6. Deploy ScalarDL Ledger and Auditor on the Kubernetes cluster using Helm Charts

Step 7. Start a Client container

Step 8. Run ScalarDL sample contracts in the Client container

Step 9. Delete all resources

Further reading