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feat(GKE): add multitenant quickstart (#633)
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‎gke/quickstart/multitenant/backend.yaml‎

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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# [START gke_quickstart_multitenant_backend]
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: backend-configmap
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namespace: backend-team
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labels:
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app: backend
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data:
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go.mod: |
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module multitenant
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go 1.22
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require github.com/go-sql-driver/mysql v1.8.1
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require filippo.io/edwards25519 v1.1.0 // indirect
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go.sum: |
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filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
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filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
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github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
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github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
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backend.go: |
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package main
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import (
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"database/sql"
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"os"
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_ "github.com/go-sql-driver/mysql"
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)
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func main() {
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mux := http.NewServeMux()
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mux.HandleFunc("/", frontend)
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port := "8080"
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log.Printf("Server listening on port %s", port)
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log.Fatal(http.ListenAndServe(":"+port, mux))
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}
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func frontend(w http.ResponseWriter, r *http.Request) {
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log.Printf("Serving request: %s", r.URL.Path)
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host, _ := os.Hostname()
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fmt.Fprintf(w, "Backend!\n")
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fmt.Fprintf(w, "Hostname: %s\n", host)
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// Open database using cloud-sql-proxy sidecar
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db, err := sql.Open("mysql", "multitenant-app@tcp/multitenant-app")
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if err != nil {
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fmt.Fprintf(w, "Error: %v\n", err)
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return
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}
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// Create metadata Table if not exists
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_, err = db.Exec("CREATE TABLE IF NOT EXISTS metadata (metadata_key varchar(255) NOT NULL, metadata_value varchar(255) NOT NULL, PRIMARY KEY (metadata_key))")
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if err != nil {
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fmt.Fprintf(w, "Error: %v\n", err)
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return
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}
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// Pick random primary color
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var color string
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randInt := rand.Intn(3) + 1
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switch {
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case randInt == 1:
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color = "red"
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case randInt == 2:
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color = "green"
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case randInt == 3:
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color = "blue"
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}
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// Set color in database
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_, err = db.Exec(fmt.Sprintf("REPLACE INTO metadata (metadata_key, metadata_value) VALUES ('color', '%s')", color))
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if err != nil {
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fmt.Fprintf(w, "Error: %v\n", err)
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return
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}
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fmt.Fprintf(w, "Set Color: %s\n", color)
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}
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: backendweb
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namespace: backend-team
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labels:
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app: backend
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spec:
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selector:
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matchLabels:
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app: backend
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tier: web
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template:
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metadata:
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labels:
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app: backend
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tier: web
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spec:
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containers:
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- name: backend-container
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image: golang:1.22
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command: ["go"]
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args: ["run", "."]
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workingDir: "/tmp/backend"
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volumeMounts:
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- name: backend-configmap
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mountPath: /tmp/backend/
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readOnly: true
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- name: cloud-sql-proxy
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image: gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.11.4
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args:
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- "--structured-logs"
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- "--port=3306"
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- "$(CONNECTION_NAME_KEY)"
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securityContext:
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runAsNonRoot: true
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env:
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- name: CONNECTION_NAME_KEY
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valueFrom:
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configMapKeyRef:
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name: database-configmap
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key: CONNECTION_NAME
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volumes:
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- name: backend-configmap
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configMap: { name: backend-configmap }
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: backendweb
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namespace: backend-team
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labels:
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app: backend
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annotations:
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networking.gke.io/load-balancer-type: "Internal" # Remove to create an external loadbalancer
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spec:
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selector:
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app: backend
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tier: web
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ports:
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- port: 80
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targetPort: 8080
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type: LoadBalancer
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# [END gke_quickstart_multitenant_backend]

‎gke/quickstart/multitenant/frontend.yaml‎

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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# [START gke_quickstart_multitenant_frontend]
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: frontend-configmap
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namespace: frontend-team
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labels:
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app: frontend
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data:
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go.mod: |
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module multitenant
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go 1.22
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require github.com/go-sql-driver/mysql v1.8.1
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require filippo.io/edwards25519 v1.1.0 // indirect
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go.sum: |
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filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
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filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
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github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
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github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
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frontend.go: |
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package main
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import (
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"database/sql"
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"fmt"
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"log"
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"net/http"
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"os"
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_ "github.com/go-sql-driver/mysql"
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)
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func main() {
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mux := http.NewServeMux()
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mux.HandleFunc("/", frontend)
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port := "8080"
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log.Printf("Server listening on port %s", port)
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log.Fatal(http.ListenAndServe(":"+port, mux))
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}
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func frontend(w http.ResponseWriter, r *http.Request) {
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log.Printf("Serving request: %s", r.URL.Path)
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host, _ := os.Hostname()
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fmt.Fprintf(w, "Frontend!\n")
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fmt.Fprintf(w, "Hostname: %s\n", host)
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// Open database using cloud-sql-proxy sidecar
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db, err := sql.Open("mysql", "multitenant-app@tcp/multitenant-app")
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if err != nil {
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fmt.Fprint(w, "Error: %v\n", err)
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return
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}
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// Retrieve color from the database
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var color string
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err = db.QueryRow("SELECT metadata_value FROM metadata WHERE metadata_key='color'").Scan(&color)
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switch {
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case err == sql.ErrNoRows:
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fmt.Fprintf(w, "Error: color not found in database\n")
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case err != nil:
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fmt.Fprintf(w, "Error: %v\n", err)
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default:
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fmt.Fprintf(w, "Got Color: %s\n", color)
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}
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}
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: frontendweb
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namespace: frontend-team
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labels:
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app: frontend
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spec:
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selector:
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matchLabels:
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app: frontend
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tier: web
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template:
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metadata:
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labels:
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app: frontend
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tier: web
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spec:
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containers:
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- name: frontend-container
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image: golang:1.22
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command: ["go"]
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args: ["run", "."]
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workingDir: "/tmp/frontend"
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volumeMounts:
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- name: frontend-configmap
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mountPath: /tmp/frontend/
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readOnly: true
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- name: cloud-sql-proxy
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image: gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.11.4
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args:
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- "--structured-logs"
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- "--port=3306"
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- "$(CONNECTION_NAME_KEY)"
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securityContext:
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runAsNonRoot: true
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env:
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- name: CONNECTION_NAME_KEY
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valueFrom:
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configMapKeyRef:
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name: database-configmap
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key: CONNECTION_NAME
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volumes:
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- name: frontend-configmap
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configMap: { name: frontend-configmap }
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: frontendweb
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namespace: frontend-team
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labels:
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app: frontend
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annotations:
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networking.gke.io/load-balancer-type: "Internal" # Remove to create an external loadbalancer
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spec:
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selector:
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app: frontend
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tier: web
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ports:
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- port: 80
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targetPort: 8080
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type: LoadBalancer
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# [END gke_quickstart_multitenant_frontend]

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