rig major updates

rig/examples/data/addons/postgres.sh

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+# PostgreSQL for this overlay: plain manifests, one replica on a PVC, password generated once and kept.
+# Notes: ../README.md
+set -euo pipefail
+cd "${RIG_CTRL:?run it through rig: bash ctrl/addons.sh install}"
+
+source ./lib/config.sh
+load_config
+
+K="kubectl --context ${KUBECONTEXT}"
+NS="${DATA_NAMESPACE:-data}"
+
+$K get namespace "$NS" >/dev/null 2>&1 || $K create namespace "$NS"
+
+# The password is generated once and then left alone, so re-running this does
+# not rotate the credential out from under whatever is already connected.
+if $K get secret -n "$NS" postgres >/dev/null 2>&1; then
+    echo "  secret exists, keeping the current password"
+else
+    password=$(head -c 18 /dev/urandom | base64 | tr -d '/+=' | head -c 24)
+    $K create secret generic postgres -n "$NS" \
+        --from-literal=POSTGRES_DB="${POSTGRES_DB:-postgres}" \
+        --from-literal=POSTGRES_USER="${POSTGRES_USER:-postgres}" \
+        --from-literal=POSTGRES_PASSWORD="$password" >/dev/null
+    echo "  generated a password (read it back with the command printed below)"
+fi
+
+echo "  applying manifests"
+$K apply -n "$NS" -f - >/dev/null <<YAML
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: postgres-data
+spec:
+  accessModes: [ReadWriteOnce]
+  resources:
+    requests:
+      storage: ${POSTGRES_STORAGE:-2Gi}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  selector:
+    app: postgres
+  ports:
+    - port: 5432
+      targetPort: 5432
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  replicas: 1
+  # One volume, one writer. Rolling would start a second pod against the same
+  # PVC before the first exits, and Postgres refuses to share a data directory.
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: postgres
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: ${POSTGRES_IMAGE}
+          envFrom:
+            - secretRef:
+                name: postgres
+          env:
+            # The image initialises into the volume root otherwise, and a
+            # lost+found from the PVC makes it refuse to initdb.
+            - name: PGDATA
+              value: /var/lib/postgresql/data/pgdata
+          ports:
+            - containerPort: 5432
+          volumeMounts:
+            - name: data
+              mountPath: /var/lib/postgresql/data
+          readinessProbe:
+            exec:
+              command: ["sh", "-c", "pg_isready -U \$POSTGRES_USER -d \$POSTGRES_DB"]
+            initialDelaySeconds: 5
+            periodSeconds: 5
+          livenessProbe:
+            exec:
+              command: ["sh", "-c", "pg_isready -U \$POSTGRES_USER -d \$POSTGRES_DB"]
+            initialDelaySeconds: 30
+            periodSeconds: 15
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: postgres-data
+YAML
+
+echo "  waiting for postgres..."
+$K rollout status deployment/postgres -n "$NS" --timeout=240s
+
+echo "  in-cluster: postgres.${NS}.svc.cluster.local:5432"
+echo "  password:   kubectl --context ${KUBECONTEXT} -n ${NS} get secret postgres -o jsonpath='{.data.POSTGRES_PASSWORD}' | base64 -d"