create plausible clickhouse database

clickhouse/.gitignore

@@ -0,0 +1,2 @@
+charts/
+!charts/databases/

clickhouse/charts/databases/.helmignore

@@ -0,0 +1,23 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

clickhouse/charts/databases/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: clickhouse databases
+description: declare clickhouse databases
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "0.0.0"

clickhouse/charts/databases/templates/init-databases-job.yaml

@@ -0,0 +1,83 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: clickhouse-db-init
+  labels:
+    app.kubernetes.io/name: clickhouse-db-init
+    app.kubernetes.io/instance: {{ .Release.Name }}
+spec:
+  template:
+    spec:
+      restartPolicy: OnFailure
+      containers:
+        - name: clickhouse-init
+          image: clickhouse/clickhouse-client:latest
+          command: ["bash", "-c"]
+          args:
+            - |
+              echo "⏳ Waiting for ClickHouse..."
+              until clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                -q "SELECT 1" >/dev/null 2>&1; do
+                sleep 2
+              done
+              echo "✅ ClickHouse ready"
+
+              {{- if .Values.databases }}
+              echo "➡️ Creating declared databases & users..."
+              clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                --multiquery < /config/init.sql
+              {{- end }}
+
+              echo "➡️ Generating list of databases to drop..."
+              clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                -q "
+                  SELECT concat('DROP DATABASE IF EXISTS ', name, ';')
+                  FROM system.databases
+                  WHERE name NOT IN (
+                    'system',
+                    'information_schema',
+                    'INFORMATION_SCHEMA',
+                    'default'
+                    {{- if .Values.databases }}
+                      {{- range $db := .Values.databases }}
+                        , '{{ $db }}'
+                      {{- end }}
+                    {{- end }}
+                  );
+                " > /tmp/to_drop.sql
+
+              if [ -s /tmp/to_drop.sql ]; then
+                echo "➡️ Dropping leftover databases:"
+                cat /tmp/to_drop.sql
+
+                clickhouse-client \
+                  --host {{ .Values.clickhouse.host }} \
+                  --port {{ .Values.clickhouse.port }} \
+                  --user {{ .Values.clickhouse.adminUser }} \
+                  --password "{{ .Values.clickhouse.adminPassword }}" \
+                  --multiquery < /tmp/to_drop.sql
+
+              else
+                echo "✔️ No databases to drop."
+              fi
+
+              echo "🎉 Initialization completed"
+          volumeMounts:
+            - name: init-sql
+              mountPath: /config
+      volumes:
+        - name: init-sql
+          configMap:
+            name: clickhouse-init-sql

clickhouse/charts/databases/templates/init-sql-configmap.yaml

@@ -0,0 +1,24 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: clickhouse-init-sql
+data:
+  init.sql: |
+    -- This file is auto-generated by Helm
+    -- Databases and users initialization
+
+    {{- range $db := .Values.databases }}
+
+    -- Database: {{ $db }}
+    CREATE DATABASE IF NOT EXISTS {{ $db }};
+
+    -- User: {{ $db }}
+    CREATE USER IF NOT EXISTS {{ $db }}
+      IDENTIFIED BY '{{ $db }}arcodange';
+
+    -- Privileges
+    GRANT CREATE, SELECT, INSERT, ALTER, DROP
+      ON {{ $db }}.*
+      TO {{ $db }};
+
+    {{- end }}

clickhouse/charts/databases/values.yaml

@@ -0,0 +1,8 @@
+clickhouse:
+  host: clickhouse.tools
+  port: 9000
+  adminUser: arcodange
+  adminPassword: clickhousearcodange
+
+databases:
+  - plausible

clickhouse/kustomization.yaml

@@ -1,12 +1,17 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
+helmGlobals:
+ chartHome: charts
+
 helmCharts:
 - name: clickhouse
   repo: https://charts.pascaliske.dev
   version: 0.4.0
   releaseName: clickhouse
   valuesFile: clickhouseValues.yaml
+- name: databases
+  releaseName: clickhouse-databases
 
 patches:
   - target: