chore: use env vars in my db-init

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/.dockerignore

@@ -0,0 +1 @@
+node_modules

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/.env.example

@@ -0,0 +1,3 @@
+MONGO_INITDB_DATABASE=app
+MONGO_INITDB_ROOT_USERNAME=root
+MONGO_INITDB_ROOT_PASSWORD=pass

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/README.md

@@ -0,0 +1,4 @@
+# How to run it
+
+1. `cp .env.example .env`
+2. `docker compose up -d`

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/compose.yaml

@@ -21,9 +21,9 @@ services:
         exec docker-entrypoint.sh $$@
     command: mongod --bind_ip_all --replSet rs0 --keyFile /data/replica.key
     environment:
-      MONGO_INITDB_DATABASE: app
-      MONGO_INITDB_ROOT_USERNAME: root
-      MONGO_INITDB_ROOT_PASSWORD: pass
+      MONGO_INITDB_DATABASE: ${MONGO_INITDB_DATABASE}
+      MONGO_INITDB_ROOT_USERNAME: ${MONGO_INITDB_ROOT_USERNAME}
+      MONGO_INITDB_ROOT_PASSWORD: ${MONGO_INITDB_ROOT_PASSWORD}
     healthcheck:
       test: ["CMD", "mongosh", "--eval", "db.adminCommand('ping')"]
       interval: 5s
@@ -37,7 +37,7 @@ services:
       db:
         condition: service_healthy
     command: >
-      mongosh --username root --password pass --host db:27017 --eval
+      mongosh --username ${MONGO_INITDB_ROOT_USERNAME} --password ${MONGO_INITDB_ROOT_PASSWORD} --host db:27017 --eval
       '
       rs.initiate( {
          _id : "rs0",

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/index.mjs

@@ -1,12 +1,25 @@
 // @ts-check
 
 import mongoose from "mongoose";
+import { config } from "dotenv";
+import { join } from "path";
 
-mongoose.connect("mongodb://root:pass@db:27017", {
+config({
+  path: [join(process.cwd(), ".env")],
+});
+
+const {
+  MONGO_INITDB_DATABASE,
+  MONGO_INITDB_ROOT_USERNAME,
+  MONGO_INITDB_ROOT_PASSWORD,
+} = process.env;
+const connectionString = `mongodb://${MONGO_INITDB_ROOT_USERNAME}:${MONGO_INITDB_ROOT_PASSWORD}@db:27017`;
+
+mongoose.connect(connectionString, {
   replicaSet: "rs0",
   autoIndex: true,
   autoCreate: true,
-  dbName: "app",
+  dbName: MONGO_INITDB_DATABASE,
 });
 
 const catSchema = new mongoose.Schema({

docker-compose-files/mongodb/mongodb-cluster/single-node-cluster/package.json

@@ -10,6 +10,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "dotenv": "^16.4.5",
     "mongoose": "^8.6.1"
   }
 }