Getting Started with Helm Charts (ScalarDL Ledger and Auditor with TLS by Using cert-manager / Auditor Mode)
This tutorial explains how to get started with ScalarDL Ledger and ScalarDL Auditor with TLS configurations by using Helm Charts and cert-manager on a Kubernetes cluster as a test environment. Before starting, you should already have a Mac or Linux environment for testing. In addition, although this tutorial mentions using minikube, the steps described should work in any Kubernetes cluster.
Requirements​
- You need to have a license key (trial license or commercial license) for ScalarDL. If you don't have a license key, please contact us.
- You need to use ScalarDL 3.9 or later, which supports TLS.
To make Byzantine-fault detection with auditing work properly, ScalarDL Ledger and ScalarDL Auditor should be deployed and managed in different administrative domains. However, in this tutorial, we will deploy ScalarDL Ledger and ScalarDL Auditor in the same Kubernetes cluster to make the test easier.
What you'll create​
In this tutorial, you'll deploy the following components on a Kubernetes cluster in the following way:
+-----------------------------------------------------------------------------------------------------------------------------+
| [Kubernetes Cluster] |
| [Pod] [Pod] [Pod] |
| |
| +-------+ +---------+ |
| +---> | Envoy | ---+ +---> | Ledger | ---+ |
| | +-------+ | | +---------+ | |
| | | | | |
| +---------+ | +-------+ | +-----------+ | +---------+ | +---------------+ |
| +---> | Service | ---+---> | Envoy | ---+---> | Service | ---+---> | Ledger | ---+---> | PostgreSQL | |
| | | (Envoy) | | +-------+ | | (Ledger) | | +---------+ | | (For Ledger) | |
| | +---------+ | | +-----------+ | | +---------------+ |
| [Pod] | | +-------+ | | +---------+ | |
| | +---> | Envoy | ---+ +---> | Ledger | ---+ |
| +--------+ | +-------+ +---------+ |
| | Client | ---+ |
| +--------+ | +-------+ +---------+ |
| | +---> | Envoy | ---+ +---> | Auditor | ---+ |
| | | +-------+ | | +---------+ | |
| | | | | | |
| | +---------+ | +-------+ | +-----------+ | +---------+ | +---------------+ |
| +---> | Service | ---+---> | Envoy | ---+---> | Service | ---+---> | Auditor | ---+---> | PostgreSQL | |
| | (Envoy) | | +-------+ | | (Auditor) | | +---------+ | | (For Auditor) | |
| +---------+ | | +-----------+ | | +---------------+ |
| | +-------+ | | +---------+ | |
| +---> | Envoy | ---+ +---> | Auditor | ---+ |
| +-------+ +---------+ |
| |
| +--------------------------------------------------------------------------+ +---------------------+ |
| | cert-manager (create private key and certificate for Envoy and ScalarDL) | | Issuer (Private CA) | |
| +--------------------------------------------------------------------------+ +---------------------+ |
| |
+-----------------------------------------------------------------------------------------------------------------------------+
cert-manager automatically creates the following private key and certificate files for TLS connections.
+----------------------+
+---> | For Scalar Envoy |
| +----------------------+
| | tls.key |
| | tls.crt |
| +----------------------+
|
+-------------------------+ | +----------------------+
| Issuer (Self-signed CA) | ---(Sign certificates)---+---> | For ScalarDL Ledger |
+-------------------------+ | +----------------------+
| tls.key | | | tls.key |
| tls.crt | | | tls.crt |
| ca.crt | | +----------------------+
+-------------------------+ |
| +----------------------+
+---> | For ScalarDL Auditor |
+----------------------+
| tls.key |
| tls.crt |
+----------------------+
Scalar Helm Charts automatically mount each private key and certificate file for Envoy and ScalarDL as follows to enable TLS in each connection. You'll manually mount a root CA certificate file on the client.
+------------------------------------------------+ +--------------------------------------+
+-------(Normal request)-----> | Envoy for ScalarDL Ledger | ---> | ScalarDL Ledger |
| +------------------------------------------------+ +--------------------------------------+
| +---(Recovery request)---> | tls.key | ---> | tls.key |
| | | tls.crt | | tls.crt |
| | | ca.crt (to verify tls.crt of ScalarDL Ledger) | | ca.crt (to check health) |
| | +------------------------------------------------+ +--------------------------------------+
+---------------------------------------+ | |
| Client | ---+ |
+---------------------------------------+ | +------------------------------------------------------------------------------------------------------------------------------+
| ca.crt (to verify tls.crt of Envoy) | | |
+---------------------------------------+ | |
| +------------------------------------------------+ +--------------------------------------+ |
+-------(Normal request)-----> | Envoy for ScalarDL Auditor | ---> | ScalarDL Auditor | ---+
+------------------------------------------------+ +--------------------------------------+
| tls.key | | tls.key |
| tls.crt | | tls.crt |
| ca.crt (to verify tls.crt of ScalarDL Auditor) | | ca.crt (to check health) |
+------------------------------------------------+ | ca.crt (to verify tls.crt of Envoy) |
+--------------------------------------+
The following connections exist amongst the ScalarDL-related components:
Client - Envoy for ScalarDL Ledger: When you execute a ScalarDL API function, the client accesses Envoy for ScalarDL Ledger.Client - Envoy for ScalarDL Auditor: When you execute a ScalarDL API function, the client accesses Envoy for ScalarDL Auditor.Envoy for ScalarDL Ledger - ScalarDL Ledger: Envoy works as an L7 (gRPC) load balancer in front of ScalarDL Ledger.Envoy for ScalarDL Auditor - ScalarDL Auditor: Envoy works as an L7 (gRPC) load balancer in front of ScalarDL Auditor.ScalarDL Auditor - Envoy for ScalarDL Ledger (ScalarDL Ledger): When ScalarDL needs to run the recovery process to keep data consistent, ScalarDL Auditor runs the request against ScalarDL Ledger via Envoy.
Step 1. Start a Kubernetes cluster and install tools​
You need to prepare a Kubernetes cluster and install some tools (kubectl, helm, cfssl, and cfssljson). For more details on how to install them, see Getting Started with Scalar Helm Charts.
Step 2. Start the PostgreSQL containers​
ScalarDL Ledger and ScalarDL Auditor must use some type of database system as a backend database. In this tutorial, you'll 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 \
-n default -
Deploy PostgreSQL for Auditor.
helm install postgresql-auditor bitnami/postgresql \
--set auth.postgresPassword=postgres \
--set primary.persistence.enabled=false \
-n default -
Check if the PostgreSQL containers are running.
kubectl get pod -n default[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​
You'll create some configuration files and private key and certificate files locally. Be sure to create a working directory for those files.
-
Create a working directory.
mkdir -p ${HOME}/scalardl-test/
Step 4. Deploy cert-manager and issuer resource​
This tutorial uses cert-manager to issue and manage private keys and certificates. You can deploy cert-manager on the Kubernetes cluster as follows:
-
Add the Jetstack helm repository.
helm repo add jetstack https://charts.jetstack.io -
Deploy cert-manager.
helm install cert-manager jetstack/cert-manager \
--create-namespace \
--set installCRDs=true \
-n cert-manager -
Check if the cert-manager containers are running.
kubectl get pod -n cert-manager[Command execution result]
NAME READY STATUS RESTARTS AGE
cert-manager-6dc66985d4-6lvtt 1/1 Running 0 26s
cert-manager-cainjector-c7d4dbdd9-xlrpn 1/1 Running 0 26s
cert-manager-webhook-847d7676c9-ckcz2 1/1 Running 0 26s -
Change the working directory to
${HOME}/scalardl-test/.cd ${HOME}/scalardl-test/ -
Create a custom values file for private CA (
private-ca-custom-values.yaml).cat << 'EOF' > ${HOME}/scalardl-test/private-ca-custom-values.yaml
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
name: self-signed-issuer
spec:
selfSigned: {}
---
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
name: self-signed-ca-cert
spec:
isCA: true
commonName: self-signed-ca
secretName: self-signed-ca-cert-secret
privateKey:
algorithm: ECDSA
size: 256
issuerRef:
name: self-signed-issuer
kind: Issuer
group: cert-manager.io
---
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
name: self-signed-ca
spec:
ca:
secretName: self-signed-ca-cert-secret
EOF -
Deploy self-signed CA.
kubectl apply -f ./private-ca-custom-values.yaml -
Check if the issuer resources are
True.kubectl get issuer[Command execution result]
NAME READY AGE
self-signed-ca True 6s
self-signed-issuer True 6s
Step 5. Create database schemas for ScalarDL Ledger and ScalarDL Auditor by using Helm Charts​
You'll deploy two ScalarDL Schema Loader pods on the Kubernetes cluster by using Helm Charts. The ScalarDL Schema Loader will create the database schemas for ScalarDL Ledger and Auditor in PostgreSQL.
-
Add the Scalar Helm Charts repository.
helm repo add scalar-labs https://scalar-labs.github.io/helm-charts -
Create a custom values file for ScalarDL Schema Loader for Ledger (
schema-loader-ledger-custom-values.yaml).cat << 'EOF' > ${HOME}/scalardl-test/schema-loader-ledger-custom-values.yaml
schemaLoading:
schemaType: "ledger"
databaseProperties: |
scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
scalar.db.username=${env:SCALAR_DL_LEDGER_POSTGRES_USERNAME}
scalar.db.password=${env:SCALAR_DL_LEDGER_POSTGRES_PASSWORD}
scalar.db.storage=jdbc
secretName: "schema-ledger-credentials-secret"
EOF -
Create a custom values file for ScalarDL Schema Loader for Auditor (
schema-loader-auditor-custom-values.yaml).cat << 'EOF' > ${HOME}/scalardl-test/schema-loader-auditor-custom-values.yaml
schemaLoading:
schemaType: "auditor"
databaseProperties: |
scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
scalar.db.username=${env:SCALAR_DL_AUDITOR_POSTGRES_USERNAME}
scalar.db.password=${env:SCALAR_DL_AUDITOR_POSTGRES_PASSWORD}
scalar.db.storage=jdbc
secretName: "schema-auditor-credentials-secret"
EOF -
Create a secret resource named
schema-ledger-credentials-secretthat includes a username and password for PostgreSQL for ScalarDL Ledger.kubectl create secret generic schema-ledger-credentials-secret \
--from-literal=SCALAR_DL_LEDGER_POSTGRES_USERNAME=postgres \
--from-literal=SCALAR_DL_LEDGER_POSTGRES_PASSWORD=postgres \
-n default -
Create a secret resource named
schema-auditor-credentials-secretthat includes a username and password for PostgreSQL for ScalarDL Auditor.kubectl create secret generic schema-auditor-credentials-secret \
--from-literal=SCALAR_DL_AUDITOR_POSTGRES_USERNAME=postgres \
--from-literal=SCALAR_DL_AUDITOR_POSTGRES_PASSWORD=postgres \
-n default -
Set the chart version of ScalarDL Schema Loader.
SCALAR_DL_VERSION=3.9.1
SCALAR_DL_SCHEMA_LOADER_CHART_VERSION=$(helm search repo scalar-labs/schema-loading -l | grep -F "${SCALAR_DL_VERSION}" | awk '{print $2}' | sort --version-sort -r | head -n 1) -
Deploy ScalarDL Schema Loader for ScalarDL Ledger.
helm install schema-loader-ledger scalar-labs/schema-loading -f ${HOME}/scalardl-test/schema-loader-ledger-custom-values.yaml --version ${SCALAR_DL_SCHEMA_LOADER_CHART_VERSION} -n default -
Deploy ScalarDL Schema Loader for ScalarDL Auditor.
helm install schema-loader-auditor scalar-labs/schema-loading -f ${HOME}/scalardl-test/schema-loader-auditor-custom-values.yaml --version ${SCALAR_DL_SCHEMA_LOADER_CHART_VERSION} -n default -
Check if the ScalarDL Schema Loader pods are deployed with the status
Completed.kubectl get pod -n default[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 10sIf the status of the ScalarDL Schema Loader pods are ContainerCreating or Running, wait for the
STATUScolumn for those pods to show asCompleted.
Step 6. Deploy ScalarDL Ledger and ScalarDL Auditor on the Kubernetes cluster by using Helm Charts​
-
Set your license key and certificate as environment variables. If you don't have a license key, please contact us. For details about the value of
<CERT_PEM_FOR_YOUR_SCALAR_DL_LEDGER_LICENSE_KEY>and<CERT_PEM_FOR_YOUR_SCALAR_DL_AUDITOR_LICENSE_KEY>, see How to Configure a Product License Key.SCALAR_DL_LEDGER_LICENSE_KEY='<YOUR_SCALAR_DL_LEDGER_LICENSE_KEY>'
SCALAR_DL_LEDGER_LICENSE_CHECK_CERT_PEM='<CERT_PEM_FOR_YOUR_SCALAR_DL_LEDGER_LICENSE_KEY>'
SCALAR_DL_AUDITOR_LICENSE_KEY='<YOUR_SCALAR_DL_AUDITOR_LICENSE_KEY>'
SCALAR_DL_AUDITOR_LICENSE_CHECK_CERT_PEM='<CERT_PEM_FOR_YOUR_SCALAR_DL_AUDITOR_LICENSE_KEY>' -
Create a custom values file for ScalarDL Ledger (
scalardl-ledger-custom-values.yaml).cat << 'EOF' > ${HOME}/scalardl-test/scalardl-ledger-custom-values.yaml
envoy:
tls:
downstream:
enabled: true
certManager:
enabled: true
issuerRef:
name: self-signed-ca
dnsNames:
- envoy.scalar.example.com
upstream:
enabled: true
overrideAuthority: "ledger.scalardl.example.com"
ledger:
image:
repository: "ghcr.io/scalar-labs/scalardl-ledger-byol"
ledgerProperties: |
### Storage configurations
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:postgresql://postgresql-ledger.default.svc.cluster.local:5432/postgres
scalar.db.username=${env:SCALAR_DL_LEDGER_POSTGRES_USERNAME}
scalar.db.password=${env:SCALAR_DL_LEDGER_POSTGRES_PASSWORD}
### Ledger configurations
scalar.dl.ledger.proof.enabled=true
scalar.dl.ledger.auditor.enabled=true
scalar.dl.ledger.authentication.method=hmac
scalar.dl.ledger.authentication.hmac.cipher_key=${env:SCALAR_DL_LEDGER_HMAC_CIPHER_KEY}
scalar.dl.ledger.servers.authentication.hmac.secret_key=${env:SCALAR_DL_LEDGER_HMAC_SECRET_KEY}
### TLS configurations
scalar.dl.ledger.server.tls.enabled=true
scalar.dl.ledger.server.tls.cert_chain_path=/tls/scalardl-ledger/certs/tls.crt
scalar.dl.ledger.server.tls.private_key_path=/tls/scalardl-ledger/certs/tls.key
### License key configurations
scalar.dl.licensing.license_key=${env:SCALAR_DL_LEDGER_LICENSE_KEY}
scalar.dl.licensing.license_check_cert_pem=${env:SCALAR_DL_LEDGER_LICENSE_CHECK_CERT_PEM}
tls:
enabled: true
overrideAuthority: "ledger.scalardl.example.com"
certManager:
enabled: true
issuerRef:
name: self-signed-ca
dnsNames:
- ledger.scalardl.example.com
secretName: "ledger-credentials-secret"
EOF -
Create a custom values file for ScalarDL Auditor (
scalardl-auditor-custom-values.yaml).cat << 'EOF' > ${HOME}/scalardl-test/scalardl-auditor-custom-values.yaml
envoy:
tls:
downstream:
enabled: true
certManager:
enabled: true
issuerRef:
name: self-signed-ca
dnsNames:
- envoy.scalar.example.com
upstream:
enabled: true
overrideAuthority: "auditor.scalardl.example.com"
auditor:
image:
repository: "ghcr.io/scalar-labs/scalardl-auditor-byol"
auditorProperties: |
### Storage configurations
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:postgresql://postgresql-auditor.default.svc.cluster.local:5432/postgres
scalar.db.username=${env:SCALAR_DL_AUDITOR_POSTGRES_USERNAME}
scalar.db.password=${env:SCALAR_DL_AUDITOR_POSTGRES_PASSWORD}
### Auditor configurations
scalar.dl.auditor.ledger.host=scalardl-ledger-envoy.default.svc.cluster.local
scalar.dl.auditor.authentication.method=hmac
scalar.dl.auditor.authentication.hmac.cipher_key=${env:SCALAR_DL_AUDITOR_HMAC_CIPHER_KEY}
scalar.dl.auditor.servers.authentication.hmac.secret_key=${env:SCALAR_DL_AUDITOR_HMAC_SECRET_KEY}
### TLS configurations
scalar.dl.auditor.server.tls.enabled=true
scalar.dl.auditor.server.tls.cert_chain_path=/tls/scalardl-auditor/certs/tls.crt
scalar.dl.auditor.server.tls.private_key_path=/tls/scalardl-auditor/certs/tls.key
scalar.dl.auditor.tls.enabled=true
scalar.dl.auditor.tls.ca_root_cert_path=/tls/scalardl-ledger/certs/ca.crt
scalar.dl.auditor.tls.override_authority=envoy.scalar.example.com
### License key configurations
scalar.dl.licensing.license_key=${env:SCALAR_DL_AUDITOR_LICENSE_KEY}
scalar.dl.licensing.license_check_cert_pem=${env:SCALAR_DL_AUDITOR_LICENSE_CHECK_CERT_PEM}
tls:
enabled: true
overrideAuthority: "auditor.scalardl.example.com"
certManager:
enabled: true
issuerRef:
name: self-signed-ca
dnsNames:
- auditor.scalardl.example.com
secretName: "auditor-credentials-secret"
EOF -
Create a secret resource named
ledger-credentials-secretthat includes credentials and a license key.kubectl create secret generic ledger-credentials-secret \
--from-literal=SCALAR_DL_LEDGER_POSTGRES_USERNAME=postgres \
--from-literal=SCALAR_DL_LEDGER_POSTGRES_PASSWORD=postgres \
--from-literal=SCALAR_DL_LEDGER_HMAC_CIPHER_KEY=ledger-hmac-cipher-key \
--from-literal=SCALAR_DL_LEDGER_HMAC_SECRET_KEY=scalardl-hmac-secret-key \
--from-literal=SCALAR_DL_LEDGER_LICENSE_KEY="${SCALAR_DL_LEDGER_LICENSE_KEY}" \
--from-file=SCALAR_DL_LEDGER_LICENSE_CHECK_CERT_PEM=<(echo ${SCALAR_DL_LEDGER_LICENSE_CHECK_CERT_PEM} | sed 's/\\n/\
/g') \
-n default -
Create a secret resource named
auditor-credentials-secretthat includes credentials and a license key.kubectl create secret generic auditor-credentials-secret \
--from-literal=SCALAR_DL_AUDITOR_POSTGRES_USERNAME=postgres \
--from-literal=SCALAR_DL_AUDITOR_POSTGRES_PASSWORD=postgres \
--from-literal=SCALAR_DL_AUDITOR_HMAC_CIPHER_KEY=auditor-hmac-cipher-key \
--from-literal=SCALAR_DL_AUDITOR_HMAC_SECRET_KEY=scalardl-hmac-secret-key \
--from-literal=SCALAR_DL_AUDITOR_LICENSE_KEY="${SCALAR_DL_AUDITOR_LICENSE_KEY}" \
--from-file=SCALAR_DL_AUDITOR_LICENSE_CHECK_CERT_PEM=<(echo ${SCALAR_DL_AUDITOR_LICENSE_CHECK_CERT_PEM} | sed 's/\\n/\
/g') \
-n default -
Create a secret resource named
auditor-keysto disable thedigital-signatureauthentication method. In this tutorial, you'll use thehmacauthentication method instead ofdigital-signature.kubectl create secret generic auditor-keys \
--from-literal=tls.key=dummy-data-to-disable-digital-signature-method \
--from-literal=certificate=dummy-data-to-disable-digital-signature-method \
-n defaultNote: If you use
hmacas an authentication method, you have to create a dummy secretauditor-keyto disabledigital-signatureon the Helm Chart side. -
Set the chart version of ScalarDL Ledger and ScalarDL Auditor.
SCALAR_DL_LEDGER_CHART_VERSION=$(helm search repo scalar-labs/scalardl -l | grep -v -e "scalar-labs/scalardl-audit" | grep -F "${SCALAR_DL_VERSION}" | awk '{print $2}' | sort --version-sort -r | head -n 1)
SCALAR_DL_AUDITOR_CHART_VERSION=$(helm search repo scalar-labs/scalardl-audit -l | grep -F "${SCALAR_DL_VERSION}" | awk '{print $2}' | sort --version-sort -r | head -n 1) -
Deploy ScalarDL Ledger.
helm install scalardl-ledger scalar-labs/scalardl -f ${HOME}/scalardl-test/scalardl-ledger-custom-values.yaml --version ${SCALAR_DL_LEDGER_CHART_VERSION} -n default -
Deploy ScalarDL Auditor.
helm install scalardl-auditor scalar-labs/scalardl-audit -f ${HOME}/scalardl-test/scalardl-auditor-custom-values.yaml --version ${SCALAR_DL_AUDITOR_CHART_VERSION} -n default -
Check if the ScalarDL Ledger and ScalarDL Auditor pods are deployed.
kubectl get pod -n default[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 11mIf the ScalarDL Ledger and ScalarDL Auditor pods are deployed properly, the
STATUScolumn for those pods will be displayed asRunning. -
Check if the ScalarDL Ledger and ScalarDL Auditor services are deployed.
kubectl get svc -n default[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 61sIf the ScalarDL Ledger and ScalarDL Auditor services are deployed properly, you can see private IP addresses in the
CLUSTER-IPcolumn.
The CLUSTER-IP values for scalardl-ledger-headless, scalardl-auditor-headless, postgresql-ledger-hl, and postgresql-auditor-hl are None since they have no IP addresses.
Step 7. Start a client container​
You'll use the CA certificate file in a client container. Therefore, you'll need to create a secret resource and mount it to the client container.
-
Create a secret resource named
client-ca-cert.kubectl create secret generic client-ca-cert --from-file=ca.crt=<(kubectl get secret self-signed-ca-cert-secret -o "jsonpath={.data['ca\.crt']}" | base64 -d) -n default -
Create a manifest file for a client pod (
scalardl-client-pod.yaml).cat << 'EOF' > ${HOME}/scalardl-test/scalardl-client-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: "scalardl-client"
spec:
containers:
- name: scalardl-client
image: eclipse-temurin:8
command: ['sleep']
args: ['inf']
env:
- name: SCALAR_DL_VERSION
value: SCALAR_DL_CLIENT_POD_SCALAR_DL_VERSION
volumeMounts:
- name: "client-ca-cert"
mountPath: "/certs/"
readOnly: true
volumes:
- name: "client-ca-cert"
secret:
secretName: "client-ca-cert"
restartPolicy: Never
EOF -
Set the ScalarDL version in the manifest file.
sed -i s/SCALAR_DL_CLIENT_POD_SCALAR_DL_VERSION/${SCALAR_DL_VERSION}/ ${HOME}/scalardl-test/scalardl-client-pod.yaml -
Deploy the client pod.
kubectl apply -f ${HOME}/scalardl-test/scalardl-client-pod.yaml -n default -
Check if the client container is running.
kubectl get pod scalardl-client -n default[Command execution result]
NAME READY STATUS RESTARTS AGE
scalardl-client 1/1 Running 0 4s
Step 8. Run ScalarDL sample contracts in the client container​
The following explains the minimum steps needed to run sample contracts. For more details about ScalarDL Ledger and ScalarDL Auditor, see the following:
-
Run bash in the client container.
kubectl exec -it scalardl-client -n default -- bashThe commands in the following steps must be run in the client container.
-
Install the git, curl, and unzip commands in the client container.
apt update && apt install -y git curl unzip -
Clone the ScalarDL Java Client SDK git repository.
git clone https://github.com/scalar-labs/scalardl-java-client-sdk.git -
Change the working directory to
scalardl-java-client-sdk/.cd scalardl-java-client-sdk/pwd[Command execution result]
/scalardl-java-client-sdk -
Change the branch to the version you're using.
git checkout -b v${SCALAR_DL_VERSION} refs/tags/v${SCALAR_DL_VERSION} -
Build the sample contracts.
./gradlew assemble -
Download the CLI tools for ScalarDL from ScalarDL Java Client SDK Releases.
curl -OL https://github.com/scalar-labs/scalardl-java-client-sdk/releases/download/v${SCALAR_DL_VERSION}/scalardl-java-client-sdk-${SCALAR_DL_VERSION}.zip -
Unzip the
scalardl-java-client-sdk-${SCALAR_DL_VERSION}.zipfile.unzip ./scalardl-java-client-sdk-${SCALAR_DL_VERSION}.zip -
Create a configuration file named
client.propertiesto access ScalarDL Ledger and ScalarDL Auditor on the Kubernetes cluster.cat << 'EOF' > client.properties
# Ledger configuration
scalar.dl.client.server.host=scalardl-ledger-envoy.default.svc.cluster.local
scalar.dl.client.tls.enabled=true
scalar.dl.client.tls.ca_root_cert_path=/certs/ca.crt
scalar.dl.client.tls.override_authority=envoy.scalar.example.com
# Auditor configuration
scalar.dl.client.auditor.enabled=true
scalar.dl.client.auditor.host=scalardl-auditor-envoy.default.svc.cluster.local
scalar.dl.client.auditor.tls.enabled=true
scalar.dl.client.auditor.tls.ca_root_cert_path=/certs/ca.crt
scalar.dl.client.auditor.tls.override_authority=envoy.scalar.example.com
# Client configuration
scalar.dl.client.authentication_method=hmac
scalar.dl.client.entity.id=client
scalar.dl.client.entity.identity.hmac.secret_key=scalardl-hmac-client-secert-key
EOF -
Register the client secret.
./scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl register-secret --config ./client.properties -
Register the sample contract
StateUpdater../scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl register-contract --config ./client.properties --contract-id StateUpdater --contract-binary-name com.org1.contract.StateUpdater --contract-class-file ./build/classes/java/main/com/org1/contract/StateUpdater.class -
Register the sample contract
StateReader../scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl register-contract --config ./client.properties --contract-id StateReader --contract-binary-name com.org1.contract.StateReader --contract-class-file ./build/classes/java/main/com/org1/contract/StateReader.class -
Register the contract
ValidateLedgerto execute a validate request../scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl register-contract --config ./client.properties --contract-id validate-ledger --contract-binary-name com.scalar.dl.client.contract.ValidateLedger --contract-class-file ./build/classes/java/main/com/scalar/dl/client/contract/ValidateLedger.class -
Execute the contract
StateUpdater../scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl execute-contract --config ./client.properties --contract-id StateUpdater --contract-argument '{"asset_id": "test_asset", "state": 3}'This sample contract updates the
state(value) of the asset namedtest_assetto3. -
Execute the contract
StateReader../scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl execute-contract --config ./client.properties --contract-id StateReader --contract-argument '{"asset_id": "test_asset"}'[Command execution result]
Contract result:
{
"id" : "test_asset",
"age" : 0,
"output" : {
"state" : 3
}
}Reference​
-
If the asset data is not tampered with, running the
execute-contractcommand to request contract execution will returnOKas a result. -
If the asset data is tampered with (for example, if the
statevalue in the database is tampered with), running theexecute-contractcommand to request contract execution will return a value other thanOK(for example,INCONSISTENT_STATES) as a result. See the following as an example for how ScalarDL detects data tampering.[Command execution result (if the asset data is tampered with)]
{
"status_code" : "INCONSISTENT_STATES",
"error_message" : "The results from Ledger and Auditor don't match"
}
-
-
Execute a validation request for the asset.
./scalardl-java-client-sdk-${SCALAR_DL_VERSION}/bin/scalardl validate-ledger --config ./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​
-
If the asset data is not tampered with, running the
validate-ledgercommand to request validation will returnOKas the result. -
If the asset data is tampered with (for example, if the
statevalue in the database is tampered with), running thevalidate-ledgercommand to request validation will return a value other thanOK(for example,INVALID_OUTPUT) as a result. See the following as an example for how ScalarDL detects data tampering.[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"
}
-
-
Exit from the client container.
exit
Step 9. Delete all resources​
After completing the ScalarDL Ledger and ScalarDL Auditor tests on the Kubernetes cluster, remove all resources.
-
Uninstall ScalarDL Ledger, ScalarDL Auditor, ScalarDL Schema Loader, and PostgreSQL.
helm uninstall -n default scalardl-ledger schema-loader-ledger postgresql-ledger scalardl-auditor schema-loader-auditor postgresql-auditor -
Remove the self-signed CA.
kubectl delete -f ./private-ca-custom-values.yaml -
Uninstall cert-manager.
helm uninstall -n cert-manager cert-manager -
Remove the client container.
kubectl delete pod scalardl-client --grace-period 0 -n default -
Remove the secret resources.
kubectl delete secrets self-signed-ca-cert-secret schema-ledger-credentials-secret schema-auditor-credentials-secret scalardl-ledger-tls-cert scalardl-ledger-envoy-tls-cert scalardl-auditor-tls-cert scalardl-auditor-envoy-tls-cert ledger-credentials-secret auditor-credentials-secret client-ca-cert auditor-keys -
Remove the namespace
cert-manager.kubectl delete ns cert-manager -
Remove the working directory and sample files (configuration files).
cd ${HOME}rm -rf ${HOME}/scalardl-test/
Further reading​
You can see how to get started with monitoring or logging for Scalar products in the following tutorials: