Connection terminated due to connection timeout error

首先检查已报告的 TypeORM、pg、Azure Database for PostgreSQL 和 AKS 配置，然后比较 Standard_B4ms 与 Standard_D4as_v5 SKU 之间的行为。调查连接超时的堆栈跟踪，以及 Azure Accelerated Networking 可能存在的差异。完成的标准是确定一个可复现的原因，以及经过验证的配置或依赖项修复方案。

We are using NestJS with TypeORM v0.3.25 and pg v8.11.3

Our TypeOrm config is:

const baseOrmConfig: PostgresConnectionOptions & TypeOrmModuleOptions = {
  type: 'postgres',
  host: process.env.DATABASE_HOST ?? 'localhost',
  port: process.env.DATABASE_PORT !== undefined ? Number(process.env.DATABASE_PORT) : 5432,
  username: process.env.DATABASE_USERNAME ?? 'postgres',
  password: process.env.DATABASE_PASSWORD ?? 'password',
  synchronize: false,
  logging: ['error'],
  autoLoadEntities: true,
  ssl: process.env.DATABASE_HOST !== undefined,
  extra: {
    // setting this to 0 to disable auto-disconnect cspell: disable-next-line
    idleTimeoutMillis: 60_000,
    keepAlive: true,
    keepAliveInitialDelayMillis: 60_000,
    max: 10,
    connectionTimeoutMillis: 30_000, // number of milliseconds to wait for connection
  },
};

We host this service on a Azure Kubernetes Service cluster, and are making connections to an Azure Database for PostgreSQL Flexible Server.

Recently, we upgraded our AKS Node SKUs from Standard_B4ms to Standard_D4as_v5, and started seeing a lot of the foll. error:

Error: Connection terminated due to connection timeout 
  at Client.<anonymous> (/usr/src/app/node_modules/pg-pool/index.js:251:17) 
  at Client.patchedClientConnectCallback (/usr/src/app/node_modules/@opentelemetry/instrumentation-pg/build/src/utils.js:309:12) 
  at /usr/src/app/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:55 
  at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14) 
  at SentryContextManager.with (/usr/src/app/node_modules/@opentelemetry/context-async-hooks/build/src/AsyncLocalStorageContextManager.js:33:40) 
  at SentryContextManager.with (/usr/src/app/node_modules/@sentry/opentelemetry/build/cjs/index.js:1430:24) 
  at Client.contextWrapper [as _connectionCallback] (/usr/src/app/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:32) 
  at Connection.<anonymous> (/usr/src/app/node_modules/pg/lib/client.js:145:18) 
  at Object.onceWrapper (node:events:632:28) 
  at Connection.emit (node:events:518:28) {   [cause]: Error: Connection terminated unexpectedly 
  at Connection.<anonymous> (/usr/src/app/node_modules/pg/lib/client.js:132:73) 
  at Object.onceWrapper (node:events:632:28) 
  at Connection.emit (node:events:518:28) 
  at Socket.<anonymous> (/usr/src/app/node_modules/pg/lib/connection.js:63:12) 
  at Socket.emit (node:events:518:28) 
  at TCP.<anonymous> (node:net:346:12) 
at TCP.callbackTrampoline (node:internal/async_hooks:130:17) } 

We reverted to using the Standard_B4ms SKU and the errors stopped. However, we do need to upgrade our SKUs. We did not have this error on our setup before this.

Any ideas what could be causing this error, and how we could fix this? The only possible explanation we could have found was that it could be related to Azure Accelerated Networking, but have no proof.