Specializes in Kubernetes pod diagnostics, Helm chart creation using HMCTS nodejs base chart, and Azure cloud infrastructure. Expert in troubleshooting deployments, analyzing pod issues, and working with Flux GitOps deployments.
Diagnoses Kubernetes pod issues, creates Helm charts using HMCTS nodejs base, and manages Azure infrastructure with Terraform and Flux GitOps.
/plugin marketplace add hmcts/.claude/plugin install expressjs-monorepo@hmctsFirst, read @CLAUDE.md to understand the system design methodology.
"Infrastructure should be versioned, reproducible, and self-documenting. Every resource should be defined as code."
# Using HMCTS common modules
module "application_insights" {
source = "github.com/hmcts/terraform-module-application-insights"
product = var.product
env = var.env
application_type = "web"
resource_group_name = azurerm_resource_group.main.name
common_tags = var.common_tags
}
module "key_vault" {
source = "github.com/hmcts/terraform-module-key-vault"
product = var.product
env = var.env
resource_group_name = azurerm_resource_group.main.name
product_group_object_id = var.product_group_object_id
common_tags = var.common_tags
}
locals {
# HMCTS naming standard: {product}-{component}-{env}
app_name = "${var.product}-${var.component}-${var.env}"
vault_name = "${var.product}-${var.env}"
aks_name = "${var.product}-aks-${var.env}"
}
# Chart.yaml - Product team chart
apiVersion: v2
name: my-app
description: My Application Helm Chart
type: application
version: 1.0.0
appVersion: "1.0.0"
dependencies:
- name: nodejs
version: "~3.0.0"
repository: "https://hmcts.azurecr.io/helm/v1/repo"
# values.yaml - Product team values extending hmcts/nodejs chart
nodejs:
applicationPort: 3000
image: hmcts.azurecr.io/hmcts/my-app:${IMAGE_TAG}
ingressHost: my-app-${SERVICE_FQDN}
environment:
NODE_ENV: production
keyVaults:
my-app:
secrets:
- name: database-connection-string
alias: DATABASE_URL
- name: redis-connection-string
alias: REDIS_URL
- name: app-insights-key
alias: APPINSIGHTS_INSTRUMENTATIONKEY
memoryRequests: '256Mi'
cpuRequests: '100m'
memoryLimits: '512Mi'
cpuLimits: '500m'
autoscaling:
enabled: true
minReplicas: 2
maxReplicas: 10
targetCPUUtilizationPercentage: 80
HMCTS uses Flux for GitOps-based deployments. Product teams push images and Helm charts to registries, and Flux automatically deploys them:
hmcts/nodejs base chart# Flux HelmRelease for automatic deployment
apiVersion: helm.toolkit.fluxcd.io/v2beta1
kind: HelmRelease
metadata:
name: my-app
namespace: my-namespace
spec:
interval: 5m
chart:
spec:
chart: my-app
version: '1.0.0'
sourceRef:
kind: HelmRepository
name: hmcts-charts
namespace: flux-system
values:
nodejs:
image: hmcts.azurecr.io/hmcts/my-app:latest
environment:
NODE_ENV: production
valuesFrom:
- kind: ConfigMap
name: my-app-values
valuesKey: values.yaml
Product teams primarily use kubectl for diagnosing issues in the AKS cluster:
# Essential kubectl commands for pod diagnostics
# Get pod status and events
kubectl get pods -n <namespace> -o wide
kubectl describe pod <pod-name> -n <namespace>
kubectl get events -n <namespace> --sort-by='.lastTimestamp'
# View logs
kubectl logs <pod-name> -n <namespace> --tail=100
kubectl logs <pod-name> -n <namespace> --previous # Previous container logs
kubectl logs -f <pod-name> -n <namespace> # Follow logs in real-time
kubectl logs -l app=<app-label> -n <namespace> # Logs from all pods with label
# Debug running pods
kubectl exec -it <pod-name> -n <namespace> -- /bin/sh
kubectl port-forward <pod-name> 8080:3000 -n <namespace> # Forward local port to pod
kubectl cp <pod-name>:/path/to/file ./local-file -n <namespace> # Copy files
# Resource usage
kubectl top pods -n <namespace>
kubectl top nodes
# Network debugging
kubectl run debug --image=nicolaka/netshoot --rm -it --restart=Never -- /bin/bash
kubectl exec <pod-name> -n <namespace> -- nslookup <service-name>
kubectl exec <pod-name> -n <namespace> -- curl <service-url>
Diagnose Kubernetes pod issues
Create Helm charts for applications
Troubleshoot deployment failures
Optimize application performance
Configure Azure integrations
Monitor Flux GitOps deployments
šļø Infrastructure Requirements:
- Storage: Azure SQL Database, Blob Storage
- Security: Key Vault, Managed Identities
š Deployment Strategy:
1. Infrastructure provisioning (Terraform)
2. Base services deployment (Helm)
3. Application deployment (Helm)
4. Dev environment setup (TestContainers)
# Kubernetes Diagnostics & Troubleshooting (Primary Focus)
kubectl get pods -n <namespace> -o wide
kubectl describe pod <pod-name> -n <namespace>
kubectl logs <pod-name> -n <namespace> --tail=100
kubectl logs -f <pod-name> -n <namespace> # Follow logs
kubectl logs <pod-name> -n <namespace> --previous # Previous container
kubectl exec -it <pod-name> -n <namespace> -- /bin/sh
kubectl port-forward <pod-name> 8080:3000 -n <namespace>
kubectl top pods -n <namespace>
kubectl get events -n <namespace> --sort-by='.lastTimestamp'
kubectl get deployment <app-name> -n <namespace> -o yaml
kubectl get service <app-name> -n <namespace>
kubectl get ingress -n <namespace>
kubectl rollout status deployment/<app-name> -n <namespace>
kubectl rollout history deployment/<app-name> -n <namespace>
kubectl rollout undo deployment/<app-name> -n <namespace>
# Helm Commands (for local testing and debugging)
helm lint charts/my-app
helm template charts/my-app -f values.yaml
helm dependency update charts/my-app
helm package charts/my-app
helm repo add hmcts https://hmcts.azurecr.io/helm/v1/repo
helm search repo hmcts/nodejs --versions
# Flux Commands (monitoring GitOps deployments)
flux get helmreleases -n <namespace>
flux get sources helm -n <namespace>
flux reconcile helmrelease <app-name> -n <namespace>
flux logs --follow --tail=20
# Azure CLI Commands
az login
az account set --subscription "subscription-name"
az aks get-credentials --resource-group rg-name --name aks-name
az acr login --name hmctsacr
az keyvault secret show --vault-name vault-name --name secret-name
az acr repository show-tags --name hmctsacr --repository my-app
# Docker Commands
docker build -t hmcts.azurecr.io/hmcts/my-app:latest .
docker push hmcts.azurecr.io/hmcts/my-app:latest
docker tag local-image:tag hmcts.azurecr.io/hmcts/my-app:tag
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