diff --git a/README.md b/README.md index a358b4c..df473a8 100644 --- a/README.md +++ b/README.md @@ -83,6 +83,7 @@ Table of Contents: | **[Deploy Memos app](containers/memos-terraform/)**
A journaling application with its database deployed with Terraform | Terraform | [Terraform] | | **[Metabase on VPC](containers/vpc-metabase/README.md)**
A Metabase instance running in a private network with a PostgreSQL database. | N/A | [Terraform] | | **[MongoDB® on VPC](containers/vpc-mongodb/README.md)**
A MongoDB® instance running in a private network with a sample application connecting to it. | TypeScript on Deno | [Terraform] | +| **[pg-connection-retry](containers/pg-connection-retry/README.md)**
A Node.js container that retries its VPC connection to a Postgres database on startup. | Node.js | [Terraform] | ### ⚙️ Jobs diff --git a/containers/pg-connection-retry/.dockerignore b/containers/pg-connection-retry/.dockerignore new file mode 100644 index 0000000..996b853 --- /dev/null +++ b/containers/pg-connection-retry/.dockerignore @@ -0,0 +1,5 @@ +node_modules +.git +*.tfstate +*.tfstate.* +.terraform/ diff --git a/containers/pg-connection-retry/.gitignore b/containers/pg-connection-retry/.gitignore new file mode 100644 index 0000000..9ab0508 --- /dev/null +++ b/containers/pg-connection-retry/.gitignore @@ -0,0 +1,47 @@ +# Node.js +node_modules/ + +# Local .terraform directories +.terraform/ + +# .tfstate files +*.tfstate +*.tfstate.* + +# Crash log files +crash.log +crash.*.log + +# Exclude all .tfvars files, which are likely to contain sensitive data, such as +# password, private keys, and other secrets. These should not be part of version +# control as they are data points which are potentially sensitive and subject +# to change depending on the environment. +*.tfvars +*.tfvars.json + +# Ignore override files as they are usually used to override resources locally and so +# are not checked in +override.tf +override.tf.json +*_override.tf +*_override.tf.json + +# Ignore transient lock info files created by terraform apply +.terraform.tfstate.lock.info + +# Include override files you do wish to add to version control using negated pattern +# !example_override.tf + +# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan +# example: *tfplan* + +# Ignore CLI configuration files +.terraformrc +terraform.rc + +# Optional: ignore graph output files generated by `terraform graph` +# *.dot + +# Optional: ignore plan files saved before destroying Terraform configuration +# Uncomment the line below if you want to ignore planout files. +# planout diff --git a/containers/pg-connection-retry/Dockerfile b/containers/pg-connection-retry/Dockerfile new file mode 100644 index 0000000..c03c559 --- /dev/null +++ b/containers/pg-connection-retry/Dockerfile @@ -0,0 +1,11 @@ +FROM node:22-slim + +WORKDIR /app + +COPY package.json package-lock.json* ./ +RUN npm install --omit=dev + +COPY . . + +EXPOSE 8080 +CMD ["node", "index.js"] diff --git a/containers/pg-connection-retry/README.md b/containers/pg-connection-retry/README.md new file mode 100644 index 0000000..4190d86 --- /dev/null +++ b/containers/pg-connection-retry/README.md @@ -0,0 +1,100 @@ +# pg-connection-retry + +A minimal Node.js example demonstrating how to make a Scaleway Serverless Container resilient to VPC connection delays when it starts. + +## Context + +Sometimes, when a Serverless Container is reloaded, it spawns **before** its VPC connection is fully ready. This is a known issue on the VPC side. Until it is fixed, applications need to **retry** their database connection on startup rather than crashing immediately. + +This example shows a simple Express app that: + +1. Tries to connect to a Postgres database on startup. +2. Retries every 5 seconds (up to 12 times) if the connection fails. +3. Only starts the HTTP server once a connection is established. + +## How it works + +- The app uses the [`pg`](https://node-postgres.com/) library and a standard libpq connection (via `PGHOST`, `PGPORT`, `PGDATABASE`, `PGUSER`, `PGPASSWORD` environment variables — no hardcoded credentials). +- `waitForDatabase()` runs a `SELECT 1` query in a retry loop before starting the Express server. +- If all retries are exhausted, the process exits with a non-zero code so the container platform can restart it. + +## Files + +| File | Description | +|----------------|--------------------------------------------------------------------------------| +| `index.js` | The Node.js application with retry logic | +| `package.json` | Dependencies (`express`, `pg`) | +| `Dockerfile` | Builds the container image | +| `main.tf` | Terraform config: RDB instance, VPC, private network, and Serverless Container | +| `variables.tf` | Terraform input variables | +| `providers.tf` | Terraform provider configuration | +| `outputs.tf` | Terraform outputs (container endpoint) | + +## Prerequisites + +- A Scaleway account +- [Terraform](https://developer.hashicorp.com/terraform/install) or [OpenTofu](https://opentofu.org/) installed +- [Docker](https://docs.docker.com/get-docker/) installed +- [Scaleway CLI](https://www.scaleway.com/en/docs/scaleway-cli/) installed and authenticated + +## Deploy + +### 1. Build and push the container image + +Log in to the Scaleway Container Registry: + +```bash +scw registry login +``` + +Build and push the image: + +```bash +docker build -t rg.fr-par.scw.cloud/examples/pg-connection-retry:latest . +docker push rg.fr-par.scw.cloud/examples/pg-connection-retry:latest +``` + +### 2. Deploy with Terraform + +Set the required variables (e.g. via environment variables): + +```bash +export TF_VAR_db_admin_password="your-secure-admin-password" +export TF_VAR_db_password="your-secure-app-password" +export TF_VAR_registry_image="rg.fr-par.scw.cloud/examples/pg-connection-retry:latest" +``` + +Apply the Terraform configuration: + +```bash +tofu init +tofu apply +``` + +### 3. Access the container + +After the deployment, you can find the container endpoint in the output: + +```bash +tofu output container_public_endpoint +``` + +You can test the connection: + +```bash +CONTAINER_URL=$(tofu output -raw container_public_endpoint) + +# Health check +curl $CONTAINER_URL/ + +# Database ping +curl $CONTAINER_URL/ping +``` + +## Cleaning Up + +Destroy the Terraform-managed infrastructure when you're done: + +```bash +tofu destroy +``` diff --git a/containers/pg-connection-retry/index.js b/containers/pg-connection-retry/index.js new file mode 100644 index 0000000..d7ddc54 --- /dev/null +++ b/containers/pg-connection-retry/index.js @@ -0,0 +1,78 @@ +const express = require("express"); +const { Pool } = require("pg"); + +const app = express(); +const port = process.env.PORT || 8080; + +// Retry configuration +const RETRY_INTERVAL_MS = 5000; // Wait between retries +const MAX_RETRIES = 12; // Give up after ~1 minute + +// pg reads standard libpq environment variables (PGHOST, PGPORT, etc.) +// which are injected by the Scaleway Container. +const pool = new Pool(); + +pool.on("error", (err) => { + console.error("Unexpected error on idle client:", err.message); +}); + +// SQLSTATE error classes that indicate the connection is gone: +// 08xxx – Connection Exception +// 53xxx – Insufficient Resources +// 57xxx – Operator Intervention +function isConnectionError(err) { + return err.code && /^(08|53|57)/.test(err.code); +} + +function sleep(ms) { + return new Promise((resolve) => setTimeout(resolve, ms)); +} + +// Try to establish a connection to the database, retrying until it succeeds +// or MAX_RETRIES is reached. This handles the case where the VPC connection +// is not fully ready when the container starts. +async function waitForDatabase() { + for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) { + try { + await pool.query("SELECT 1"); + console.log("Database connection established."); + return true; + } catch (err) { + console.error( + `Connection attempt ${attempt}/${MAX_RETRIES} failed: ${err.message}` + ); + if (attempt < MAX_RETRIES) { + await sleep(RETRY_INTERVAL_MS); + } + } + } + return false; +} + +app.get("/", (req, res) => { + res.json({ status: true }); +}); + +app.get("/ping", async (req, res) => { + try { + await pool.query("SELECT 1"); + res.json({ status: true }); + } catch (err) { + console.error("Ping failed:", err.message); + res.status(500).json({ status: false, error: err.message }); + } +}); + +async function main() { + const connected = await waitForDatabase(); + if (!connected) { + console.error("Could not connect to the database, exiting."); + process.exit(1); + } + + app.listen(port, () => { + console.log(`Server listening on port ${port}`); + }); +} + +main(); diff --git a/containers/pg-connection-retry/main.tf b/containers/pg-connection-retry/main.tf new file mode 100644 index 0000000..45a8b75 --- /dev/null +++ b/containers/pg-connection-retry/main.tf @@ -0,0 +1,100 @@ +locals { + name = "pg-connection-retry" + db_postgres_version = "16" + base_tags = ["pg-connection-retry", "vpc"] +} + +resource "scaleway_vpc" "main" { + name = local.name +} + +resource "scaleway_vpc_private_network" "main" { + name = local.name + vpc_id = scaleway_vpc.main.id +} + +resource "scaleway_rdb_instance" "main" { + name = "db-${local.name}" + tags = concat(local.base_tags, ["pg-${local.db_postgres_version}"]) + + node_type = "db-play2-nano" + + is_ha_cluster = false + private_network { + pn_id = scaleway_vpc_private_network.main.id + enable_ipam = true + } + + encryption_at_rest = true + volume_size_in_gb = 10 + volume_type = "sbs_5k" + + engine = "PostgreSQL-${local.db_postgres_version}" + + user_name = var.db_admin_username + password = var.db_admin_password +} + +resource "scaleway_rdb_database" "main" { + instance_id = scaleway_rdb_instance.main.id + name = local.name +} + +resource "scaleway_rdb_user" "main" { + instance_id = scaleway_rdb_instance.main.id + + name = var.db_username + password = var.db_password +} + +resource "scaleway_rdb_privilege" "main" { + instance_id = scaleway_rdb_instance.main.id + user_name = scaleway_rdb_user.main.name + database_name = scaleway_rdb_database.main.name + permission = "all" +} + +resource "scaleway_container_namespace" "main" { + name = local.name + description = "Namespace for the pg-connection-retry container" + tags = local.base_tags +} + +locals { + db_endpoint = scaleway_rdb_instance.main.private_network[0] + rdb_instance_id = split("/", scaleway_rdb_instance.main.id)[1] # To remove the `/` prefix +} + +resource "scaleway_container" "main" { + name = local.name + description = "Node.js container that retries its VPC connection to a Postgres DB" + tags = local.base_tags + + namespace_id = scaleway_container_namespace.main.id + image = var.registry_image + + private_network_id = scaleway_vpc_private_network.main.id + + cpu_limit = 1000 + memory_limit_bytes = 1024 * 1024 * 1024 # 1 GB + sandbox = "v1" + + https_connections_only = true + port = 8080 + + max_scale = 1 # No real need to have more than one instance running + + environment_variables = { + # Within a private network, we can refer to resources using their internal hostname. + # The format is `..internal`. + PGHOST = "${local.rdb_instance_id}.${scaleway_vpc_private_network.main.name}.internal" + PGPORT = local.db_endpoint.port + + PGDATABASE = scaleway_rdb_database.main.name + PGUSER = scaleway_rdb_user.main.name # Referencing the user directly to create a Terraform dependency + } + + secret_environment_variables = { + PGPASSWORD = var.db_password + } +} diff --git a/containers/pg-connection-retry/outputs.tf b/containers/pg-connection-retry/outputs.tf new file mode 100644 index 0000000..229c600 --- /dev/null +++ b/containers/pg-connection-retry/outputs.tf @@ -0,0 +1,4 @@ +output "container_public_endpoint" { + description = "Public HTTPS endpoint of the deployed container" + value = "https://${scaleway_container.main.domain_name}" +} diff --git a/containers/pg-connection-retry/package-lock.json b/containers/pg-connection-retry/package-lock.json new file mode 100644 index 0000000..130c3c9 --- /dev/null +++ b/containers/pg-connection-retry/package-lock.json @@ -0,0 +1,976 @@ +{ + "name": "pg_connection_retry", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "pg_connection_retry", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "express": "^4.21.2", + "pg": "^8.13.1" + } + }, + "node_modules/accepts": { + "version": "1.3.8", + "resolved": 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b/containers/pg-connection-retry/package.json new file mode 100644 index 0000000..32d18f9 --- /dev/null +++ b/containers/pg-connection-retry/package.json @@ -0,0 +1,15 @@ +{ + "name": "pg_connection_retry", + "version": "1.0.0", + "description": "Serverless Containers example that retries its VPC connection to a Postgres DB.", + "license": "ISC", + "type": "commonjs", + "main": "index.js", + "scripts": { + "start": "node index.js" + }, + "dependencies": { + "express": "^4.21.2", + "pg": "^8.13.1" + } +} diff --git a/containers/pg-connection-retry/providers.tf b/containers/pg-connection-retry/providers.tf new file mode 100644 index 0000000..9de2322 --- /dev/null +++ b/containers/pg-connection-retry/providers.tf @@ -0,0 +1,8 @@ +terraform { + required_providers { + scaleway = { + source = "scaleway/scaleway" + version = "~> 2.78" + } + } +} diff --git a/containers/pg-connection-retry/variables.tf b/containers/pg-connection-retry/variables.tf new file mode 100644 index 0000000..14baaa9 --- /dev/null +++ b/containers/pg-connection-retry/variables.tf @@ -0,0 +1,28 @@ +variable "db_admin_username" { + description = "Admin username for the RDB instance" + type = string + default = "admin" +} + +variable "db_admin_password" { + description = "Admin password for the RDB instance" + type = string + sensitive = true +} + +variable "db_username" { + description = "Username for the application database user" + type = string + default = "app" +} + +variable "db_password" { + description = "Password for the application database user" + type = string + sensitive = true +} + +variable "registry_image" { + description = "Full reference of the container image to deploy (e.g. rg.fr-par.scw.cloud/namespace/name:tag)" + type = string +}