我有一个 docker compose 文件，如下所示：
1
795version: "3.9"
services:
mysqldb:
image: mysql:5.7
container_name: mysqlcontainer
command: --default-authentication-plugin=mysql_native_password
volumes:
- ./db/init.sql:/docker-entrypoint-initdb.d/0_init.sql
ports:
- 3306:3306
expose:
- 3306
environment:
MYSQL_DATABASE: "todos"
MYSQL_USER: "admin"
MYSQL_PASSWORD: "password"
MYSQL_ROOT_PASSWORD: "password"
SERVICE_TAGS: dev
SERVICE_NAME: mysqldb
restart: on-failure
networks:
- internalnet
expressapp:
container_name: api
build: .
image: expressapp:1.0
ports:
- "3001:3001"
expose:
- "3001"
environment:
DB_HOST: mysqldb
DB_PORT: 3306
DB_USER: "admin"
DB_PASSWORD: "password"
DB_NAME: todos
DB_CONNECTION_LIMIT: 20
SERVICE_TAGS: dev
SERVICE_NAME: expressapp
PORT: 3001
depends_on:
- mysqldb
networks:
- internalnet
networks:
internalnet:
driver: bridge
volumes:
database:
如果我使用 docker compose up -d 命令启动容器并使用 ps 命令检查正在运行的容器，我将得到以下输出：
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 9f338b733a1c expressapp:1.0 "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 0.0.0.0:3001->3001/tcp api edef8027dc0a mysql:5.7 "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysqlcontainer
但是当我尝试向服务器发出 API 请求时，我收到以下错误消息：
"There was an error processing your request: connect ECONNREFUSED 172.24.0.2:3306"
为什么是因为我将 DB_HOST 变量设置为 mysql 服务名称？
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出现此问题的原因可能是
expressapp在mysql可用于查询之前启动。要控制服务启动顺序，您可以将
healthcheck添加到mysqldb服务：healthcheck: test: mysql ${MYSQL_DATABASE} --user=${MYSQL_USER} --password='${MYSQL_PASSWORD}' --silent --execute "SELECT 1;" interval: 30s timeout: 10s retries: 5和
depends_on块到expressappdepends_on: mysqldb: condition: service_healthy查看完整示例此处
有关此内容的更多信息，请参阅此答案。