vault-agent-systemb.yaml

# Base Deployment for HashiCorp Vault example - system-b context
#
# Deploys the following containers
# - init container: with a dummy echo statement
# - base container: named "showcase", executes a script, stored in ConfigMap and appends some logs
# - sidecar container: named "showcase-sidecar", tail/follows the log file 
#
# The app binds a Secret as env variable and file mount. This show cases the circumstance, 
# that mounted secrets will be updated, env however not
#
# Difference to HashiCorp Vault specifica
# - Using annotation to inject the secrets directly from Vault
# - using service accounts to interact with Vault, service account is bound to a Vault role and policy
apiVersion: v1
kind: Secret
metadata:
  name: vault-demo-creds-01
  namespace: vault-test2
stringData:
  username: dummy
  password: dummy-value 
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: showcase-vault-scripts
  namespace: vault-test2
data:
  secrets-output.sh: |
    echo "secrets-output.sh script"
    while [ true ]; do
      
      echo "$(date '+%Y-%m-%d %H:%M:%S'): [From Main container] ...waiting..." >> /logs/test.log; 

      echo "[Main container] ...waiting..."
      
      #echo "Mounted:"
      #echo "username=$(cat /secrets/showcase/username)"
      #echo "password=$(cat /secrets/showcase/password)"

      echo "Env:"
      echo "...sourcing env-file (dev) with content from Vault..."
      source /vault/secrets/db-env
      #echo "...sourcing env-file (system-b) with content from Vault..."
      #source /vault/secrets/db2-env
      env | grep -i db

      echo "-------------------------------------------"

      sleep 15
    done;  
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: showcase-vault-deployment
  namespace: vault-test2
  labels:
    app: showcase-vault
spec:
  replicas: 1
  selector:
    matchLabels:
      app: showcase-vault
  template:
    metadata:
      labels:
        app: showcase-vault
      annotations:        
        # Enable Vault Agent Injection
        vault.hashicorp.com/agent-inject: "true"        
        vault.hashicorp.com/agent-inject-status: "update"   
        # The secrets will be mounted as volumes with path /vault/secrets/...     
        #vault.hashicorp.com/agent-inject-secret-db-id: "system-a/dev/db_userid"        
        #vault.hashicorp.com/agent-inject-secret-db-pw: "system-a/dev/db_password"        
        # Inject the Vault secret into a file '/vault/secrets/db.cfg'
        vault.hashicorp.com/agent-inject-secret-db.cfg: "secret/dev/system-b"   
        vault.hashicorp.com/agent-inject-template-db.cfg: |          
          {{- with secret "secret/dev/system-b" -}}
          {{ .Data.data.db_userid }}
          {{- end }}    
        # Create a file to be sourced, which sets env variables
        vault.hashicorp.com/agent-inject-secret-db-env: "secret/dev/system-b"   
        vault.hashicorp.com/agent-inject-template-db-env: |          
          {{- with secret "secret/dev/system-b" -}}
          {{ range $k, $v := .Data.data }}
          export {{ $k }}="{{ $v }}"
          {{ end }}     
          {{- end }}       
        vault.hashicorp.com/role: "role-system-b-dev"
    spec:
      # Specific sa, relevant for Vault interaction
      serviceAccountName: sa-system-b-dev
      containers:
      - name: showcase-vault
        image: busybox:1.28
        command: ['sh', '-c', '/scripts/secrets-output.sh']
        volumeMounts:
          # Mount for the logs, shared with sidecar
          - name: logs
            mountPath: /logs
          # Mount from ConfigMap holding a script
          - name: showcase-scripts-configmap
            mountPath: /scripts
      volumes:
        - name: logs
          emptyDir: {}
        - name: showcase-scripts-configmap
          configMap:
            name: showcase-vault-scripts
            defaultMode: 0777