Question

我正在构建一个连接到PostgreSQL数据库的新Sails.js应用程序。在我使用sails generate model products创建新模型之前，该应用程序过去运行得很好。现在，当应用程序尝试启动时，我遇到以下错误：

server_1      | [nodemon] starting `node app.js`
server_1      |  info: ·• Auto-migrating...  (alter)
server_1      |  info:    Hold tight, this could take a moment.
server_1      | Troubleshooting tips:
server_1      |
server_1      |  -> Is your Postgresql configuration correct?  Maybe your `poolSize` configuration is set too high? e.g. If your Postgresql database only supports 20 concurrent connections, you should make sure you have your `poolSize` set as something < 20 (see http://stackoverflow.com/a/27387928/486547). The default `poolSize` is 10. To override default settings, specify the desired properties on the relevant Postgresql "connection" config object where the host/port/database/etc. are configured. If you're using Sails, this is generally located in `config/datastores.js`, or wherever your environment-specific database configuration is set.
server_1      |
server_1      |  -> Maybe your `poolSize` configuration is set too high? e.g. If your Postgresql database only supports 20 concurrent connections, you should make sure you have your `poolSize` set as something < 20 (see http://stackoverflow.com/a/27387928/486547). The default `poolSize` is 10.
server_1      |
server_1      |  -> Do you have multiple Sails instances sharing the same Postgresql database? Each Sails instance may use up to the configured `poolSize` # of connections. Assuming all of the Sails instances are just copies of one another (a reasonable best practice) we can calculate the actual # of Postgresql connections used (C) by multiplying the configured `poolSize` (P) by the number of Sails instances (N). If the actual number of connections (C) exceeds the total # of **AVAILABLE** connections to your Postgresql database (V), then you have problems.  If this applies to you, try reducing your `poolSize` configuration. A reasonable `poolSize` setting would be V/N.

为响应此错误，我将poolSize密钥添加到了datastores.js文件中，如下所示：

module.exports.datastores = {

  default: {
    adapter: 'sails-postgresql',
    url: 'postgresql://postgres@postgresql:5432/web-service',
    poolSize: 1
  },
};

它仍然引发相同的错误。应用程序和数据库都在Docker环境中运行。这是我的docker-compose.yml的样子：

version: '3.4'

services:
  server:
    image: web-service
    build: .
    environment:
      NODE_ENV: development
      IS_DEV_MACHINE: "yes"
    ports:
      - 1338:1337 # HOST_PORT is 1338 to avoid conflicts with other Sails.js apps running on host
    volumes:
      - ../:/usr/src/app
    entrypoint: nodemon

  postgresql:
    image: bitnami/postgresql:9.6
    ports:
      - 5433:5432 # HOST_PORT is 5433 to avoid conflicts with other PostgreSQL instances running on host
    volumes:
      - ../database:/bitnami

我似乎在任何地方都找不到解决方案。关于此主题的其他StackOverflow线程已经有一年多没有得到解答了。任何帮助表示赞赏。

Answer 1

我设法通过从bitnami：postgresql：9.6 Docker映像切换到postgres：9.6解决了该错误。显然postgres：9.6接受100个连接（似乎比Bitnami图像接受的连接更多）。即使我从datastores.js中删除poolSize: 1，Sail也不会再引发poolSize错误。这就是我的docker-compose.yml文件现在的样子

version: '3.4'

services:
  server:
    image: web-service
    build: .
    environment:
      NODE_ENV: development
      IS_DEV_MACHINE: "yes"
    ports:
      - 1338:1337 # HOST_PORT is 1338 to avoid conflicts with other Sails.js apps running on host
    volumes:
      - ../:/usr/src/app
    entrypoint: nodemon

  postgresql:
    image: postgres:9.6
    environment:
      POSTGRES_USER: admin
      POSTGRES_PASSWORD: admin
    ports:
      - 5433:5432 # HOST_PORT is 5433 to avoid conflicts with other PostgreSQL instances running on host
    volumes:
      - ../database:/var/lib/postgresql/data

连接到在Docker容器中运行的数据库时，sails-postgresql“ poolSize”的错误太高

1 个答案: