185 lines
4.0 KiB
Markdown
185 lines
4.0 KiB
Markdown
# 后端启动配置问题修复
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## 问题描述
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后端启动时报错：
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```
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Could not resolve placeholder 'spring.datasource.druid.initialSize'
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```
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## 原因分析
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若依项目使用了 Druid 数据源，配置在 `application-druid.yml` 中。环境变量无法直接覆盖 Druid 的嵌套配置属性。
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## 解决方案
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### 1. 创建启动脚本
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已创建 [entrypoint.sh](backend/entrypoint.sh)，使用 Java 系统属性覆盖配置：
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```bash
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#!/bin/sh
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exec java \
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-Dspring.profiles.active=prod \
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-Dspring.datasource.druid.master.url="${SPRING_DATASOURCE_URL}" \
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-Dspring.datasource.druid.master.username="${SPRING_DATASOURCE_USERNAME}" \
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-Dspring.datasource.druid.master.password="${SPRING_DATASOURCE_PASSWORD}" \
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-Dspring.redis.host="${SPRING_REDIS_HOST}" \
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-Dspring.redis.port="${SPRING_REDIS_PORT}" \
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-jar app.jar
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```
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### 2. 修改 Dockerfile
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已修改 [backend/Dockerfile](backend/Dockerfile)，使用启动脚本：
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```dockerfile
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# 复制启动脚本
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COPY entrypoint.sh /entrypoint.sh
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RUN chmod +x /entrypoint.sh
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# 启动应用
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ENTRYPOINT ["/entrypoint.sh"]
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```
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## 重新部署
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### 1. 停止并删除旧容器
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```bash
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docker stop wecom-backend
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docker rm wecom-backend
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```
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### 2. 重新构建并启动
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```bash
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cd deploy
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docker compose up -d --build backend
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```
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### 3. 查看日志
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```bash
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docker compose logs -f backend
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```
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## 验证启动成功
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查看日志中是否有以下内容：
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```
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Started RuoYiApplication in X seconds
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```
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## 其他可能的问题
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### 1. 数据库连接失败
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检查 MySQL 容器是否允许远程连接：
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```bash
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docker exec -it mysql-jijin-test mysql -uroot -p
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# 授权远程访问
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GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'jiong1114';
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FLUSH PRIVILEGES;
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```
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### 2. 数据库不存在
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创建数据库：
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```bash
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docker exec -it mysql-jijin-test mysql -uroot -pjiong1114
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CREATE DATABASE IF NOT EXISTS `ry-vue` DEFAULT CHARACTER SET utf8mb4;
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```
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### 3. Redis 连接失败
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检查 Redis 是否允许远程连接：
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```bash
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docker exec -it redis redis-cli CONFIG GET bind
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# 如果绑定了 127.0.0.1，需要修改
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docker exec -it redis redis-cli CONFIG SET bind "0.0.0.0"
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```
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### 4. 端口配置不匹配
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注意 docker-compose.yml 中配置的是 8888 端口：
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```yaml
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ports:
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- "8888:8888" # 宿主机:容器
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```
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但 Dockerfile 暴露的是 8080 端口。需要修改其中一个保持一致。
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#### 方案 A: 修改 docker-compose.yml（推荐）
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```yaml
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ports:
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- "8888:8080" # 宿主机 8888 映射到容器 8080
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```
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#### 方案 B: 修改应用端口
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在 docker-compose.yml 中添加环境变量：
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```yaml
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environment:
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- SERVER_PORT=8888
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```
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## 完整的 docker-compose.yml 配置
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```yaml
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version: '3.8'
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services:
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backend:
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build:
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context: ./backend
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dockerfile: Dockerfile
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container_name: wecom-backend
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restart: always
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ports:
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- "8888:8080" # 宿主机 8888 映射到容器 8080
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volumes:
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- upload_data:/home/ruoyi/uploadPath
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environment:
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- SPRING_PROFILES_ACTIVE=prod
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- TZ=Asia/Shanghai
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- SPRING_DATASOURCE_URL=jdbc:mysql://host.docker.internal:3316/ry-vue?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
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- SPRING_DATASOURCE_USERNAME=root
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- SPRING_DATASOURCE_PASSWORD=jiong1114
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- SPRING_REDIS_HOST=host.docker.internal
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- SPRING_REDIS_PORT=6379
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- SPRING_REDIS_PASSWORD=
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extra_hosts:
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- "host.docker.internal:host-gateway"
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networks:
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- wecom-network
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healthcheck:
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test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:8080/"]
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interval: 30s
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timeout: 10s
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retries: 3
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frontend:
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build:
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context: ./frontend
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dockerfile: Dockerfile
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container_name: wecom-frontend
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restart: always
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ports:
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- "8889:80"
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depends_on:
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- backend
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networks:
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- wecom-network
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volumes:
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upload_data:
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driver: local
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networks:
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wecom-network:
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driver: bridge
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```
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注意 healthcheck 中使用的是容器内部端口 8080。
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