我有一个依赖于MSSQL的服务（一个ASP.NET Core Web应用程序）。这些服务使用Docker compose进行编排，我希望docker compose在运行我的服务之前首先启动数据库并等待其准备就绪。为此，我正在定义docker-compose.yml：
version: '3.7'
services:
sql.data:
container_name: db_service
image: microsoft/mssql-server-linux:2017-latest
healthcheck:
test: ["CMD", "/opt/mssql-tools/bin/sqlcmd", "-S", "http://localhost:1433", "-U", "sa", "-P", "Pass_word", "-Q", "SELECT 1", "||", "exit 1"]
my_service:
container_name: my_service_container
image: ${DOCKER_REGISTRY-}my_service
build:
context: .
dockerfile: MyService/Dockerfile
depends_on:
- sql.data
通过这个健康检查，Docker Compose 不会等待数据库服务准备就绪，而是立即启动my_service。如预期的那样，my_service在连接数据库时失败。其中一部分日志如下：
Recreating db_service ... done
Recreating my_service_container ... done
Attaching to db_service, my_service_container
my_service_container | info: ...Context[0]
my_service_container | Migrating database associated with context Context
my_service_container | info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
my_service_container | Entity Framework Core 3.1.1 initialized 'Context' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: MigrationsAssembly=MyService
my_service_container | fail: Context[0]
my_service_container | An error occurred while migrating the database used on context Context
my_service_container | Microsoft.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 40 - Could not open a connection to SQL Server)
...
exception details
...
my_service_container | ClientConnectionId:00000000-0000-0000-0000-000000000000
my_service_container exited with code 0
db_service | 2020-03-05 05:45:51.82 Server Microsoft SQL Server 2017 (RTM-CU13) (KB4466404) - 14.0.3048.4 (X64)
Nov 30 2018 12:57:58
Copyright (C) 2017 Microsoft Corporation
Developer Edition (64-bit) on Linux (Ubuntu 16.04.5 LTS)
2020-03-05 05:45:51.82 Server UTC adjustment: 0:00
2020-03-05 05:45:51.82 Server (c) Microsoft Corporation.
2020-03-05 05:45:51.82 Server All rights reserved.
2020-03-05 05:45:51.82 Server Server process ID is 4120.
2020-03-05 05:45:51.82 Server Logging SQL Server messages in file '/var/opt/mssql/log/errorlog'.
2020-03-05 05:45:51.82 Server Registry startup parameters:
-d /var/opt/mssql/data/master.mdf
-l /var/opt/mssql/data/mastlog.ldf
-e /var/opt/mssql/log/errorlog
根据日志显示，Docker Compose首先启动了数据库，但在运行我的服务之前并没有等待它变为就绪。
我尝试了不同的语法来使用 healthcheck，例如:
test: /opt/mssql-tools/bin/sqlcmd -S http://localhost:1433 -U sa -P ${SA_PASSWORD} -Q "SELECT 1" || exit 1
但是两者都没有按预期工作。
我已在以下在线来源中检查，但使用任何一种都无法解决问题：
这个功能在版本3.7中是否得到支持？因为这个令人困惑的评论
问题
有什么好的方法可以等待MSSQL服务启动吗？