mysql - 使用 EB CLI 运行本地 java/mysql 容器堆栈返回 : nc: bad address 'mysql-server'

Question

所以，我有一个 docker-compose 堆栈，它有 2 个容器:一个 MySQL5.7 服务器和一个连接到 MySQL 服务器的 Spring Boot 应用程序。

最终我想将此堆栈部署到 Elastic Beanstalk 中的多 Docker 容器环境中。

但首先要重要的是。我为堆栈编写了以下 Docker Compose 文件:

docker-compose.yml:

version: '3'

services:
  mysql-server:
    container_name: mysql-server-container
    image: mysql/mysql-server:5.7
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: packages
      MYSQL_USER: user
      MYSQL_PASSWORD: test
      MYSQL_ROOT_HOST: '%'
    restart: always

  saver:
    container_name: saver-poc-container
    image: travelpaq1/saver-poc:latest
    ports:
      - 3000:8080
    environment:
      DB_HOST: jdbc:mysql://mysql-server
      DB_USER: user
      DB_PASSWORD: test
    depends_on:
      - mysql-server

其中mysql-server服务使用官方MySQL5.7 docker镜像，saver服务的镜像如下:

保护程序应用Dockerfile:

FROM openjdk:8-jdk-alpine
VOLUME /tmp
RUN apk add --no-cache bash
COPY wait-for-it.sh wait-for-it.sh
RUN chmod +x wait-for-it.sh
ARG JAR_FILE
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["./wait-for-it.sh", "--timeout=60",  "mysql-server:3306", "--", "java", "-jar", "app.jar"]

您可以注意到我正在使用 wait-for-it在启动应用程序容器之前等待数据库容器完全初始化。

所以，如果我运行 docker-compose up 一切都会正常!

现在，问题是: 正如我之前提到的，我想在 Elastic Beanstalk 的多 Docker 容器环境中运行此堆栈。 Elastic Beanstalk 不支持使用 Docker Composer 文件进行部署，而是使用名为 Dockerrun.aws.json 的文件。我用过container-transform获取与我的 docker-compose.yml 等效的 Dockerrun.aws.json 文件。文件本身如下:

{
    "AWSEBDockerrunVersion": 2,
    "containerDefinitions": [
        {
            "environment": [
                {
                    "name": "MYSQL_ROOT_PASSWORD",
                    "value": "root"
                },
                {
                    "name": "MYSQL_DATABASE",
                    "value": "packages"
                },
                {
                    "name": "MYSQL_USER",
                    "value": "user"
                },
                {
                    "name": "MYSQL_PASSWORD",
                    "value": "test"
                },
                {
                    "name": "MYSQL_ROOT_HOST",
                    "value": "%"
                }
            ],
            "essential": true,
            "image": "mysql/mysql-server:5.7",
            "name": "mysql-server"
        },
        {
            "environment": [
                {
                    "name": "DB_HOST",
                    "value": "jdbc:mysql://mysql-server"
                },
                {
                    "name": "DB_USER",
                    "value": "user"
                },
                {
                    "name": "DB_PASSWORD",
                    "value": "test"
                }
            ],
            "essential": true,
            "image": "travelpaq1/saver-poc:latest",
            "name": "saver",
            "portMappings": [
                {
                    "containerPort": 8080,
                    "hostPort": 3000
                }
            ]
        }
    ],
    "family": "",
    "volumes": []
}

EB CLI支持使用 eb local run 在本地运行堆栈。但是当我运行它时，我得到以下日志:

Creating elasticbeanstalk_mysqlserver_1 ... done
Creating elasticbeanstalk_saver_1       ... done
Attaching to elasticbeanstalk_mysqlserver_1, elasticbeanstalk_saver_1
mysqlserver_1  | [Entrypoint] MySQL Docker Image 5.7.26-1.1.11
saver_1        | wait-for-it.sh: waiting 60 seconds for mysql-server:3306
saver_1        | nc: bad address 'mysql-server'
mysqlserver_1  | [Entrypoint] Initializing database
saver_1        | nc: bad address 'mysql-server'
saver_1        | nc: bad address 'mysql-server'
saver_1        | nc: bad address 'mysql-server'
saver_1        | nc: bad address 'mysql-server'
saver_1        | nc: bad address 'mysql-server'
mysqlserver_1  | [Entrypoint] Database initialized
mysqlserver_1  | Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
mysqlserver_1  | Warning: Unable to load '/usr/share/zoneinfo/leapseconds' as time zone. Skipping it.
saver_1        | nc: bad address 'mysql-server'
mysqlserver_1  | Warning: Unable to load '/usr/share/zoneinfo/tzdata.zi' as time zone. Skipping it.
mysqlserver_1  | Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.
mysqlserver_1  | Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it.
mysqlserver_1  | 
mysqlserver_1  | [Entrypoint] ignoring /docker-entrypoint-initdb.d/*
mysqlserver_1  | 
saver_1        | nc: bad address 'mysql-server'
mysqlserver_1  | [Entrypoint] Server shut down
mysqlserver_1  | 
mysqlserver_1  | [Entrypoint] MySQL init process done. Ready for start up.
mysqlserver_1  | 
mysqlserver_1  | [Entrypoint] Starting MySQL 5.7.26-1.1.11
saver_1        | nc: bad address 'mysql-server'
saver_1        | nc: bad address 'mysql-server'
...

它只是不断打印

saver_1        | nc: bad address 'mysql-server'

最终，等待超时到期，并且保护程序应用程序无法启动，因为它无法连接到数据库。

如您所见，数据库服务容器已初始化，wait-for-it 似乎已开始运行，但 saver_1 服务无法解析mysql-server 对应数据库服务容器的地址(我猜它指的是 wait-for-it 尝试测试的地址 mysql-server:3306)

那么，可能是什么问题呢？如何让应用服务容器解析数据库服务容器 URL？我对 Elastic Beanstalk 中的多 Docker 容器环境不太熟悉。

Answer 1

这只是我的一个愚蠢的错误。

我在 saver 应用容器的容器定义中缺少 links 属性，以允许容器相互“对话”，如下所示:

"links": [
    "mysql-server"
],

我可以删除该问题，但它可能作为在 Elastic Beanstalk 中部署 docker 堆栈的摘要有用。