Docker 容器串包故障排查的问题小结

feign.RetryableException: trade-service executing GET http://trade-service/...
Caused by: java.net.UnknownHostException: trade-service
No servers available for service: trade-service

CONTAINER ID   IMAGE             STATUS          PORTS
93ce8914e791   tj-trade:latest   Up 32 minutes   0.0.0.0:8088->8088/tcp

curl http://192.168.150.101:8848/nacos/v1/ns/instance/list?serviceName=trade-service

{"name":"DEFAULT_GROUP@@trade-service", "hosts": []}

docker logs tj-trade --tail 50

com.tianji.user.UserApplication          : The following 1 profile is active: "dev"
Tomcat initialized with port(s): 8082
nacos registry, DEFAULT_GROUP user-service 192.168.150.101:8082 register finished
Application 'user-service' is running!

tjxt-parent/
├── tj-user/          # user-service
│   └── target/tj-user.jar
├── tj-trade/         # trade-service
│   └── target/tj-trade.jar
├── tj-course/        # course-service
│   └── ...
├── docker-compose.yml
└── Dockerfile        # 通用 Dockerfile，放在项目根目录

FROM openjdk:11-jre-slim
WORKDIR /app
COPY target/*.jar app.jar        # ⚠️ 通配符，复制 target 下第一个匹配的 jar
ENTRYPOINT ["sh", "-c", "java -jar app.jar"]

// 每个服务 job 大致相同，只是模块名不同
stage('Build') {
    sh 'mvn clean package -pl tj-trade -am -DskipTests'
    sh 'docker build -t tj-trade:latest .'      // ← build context 是根目录
    sh 'docker-compose up -d tj-trade'
}

时间轴 →
                    mvn clean    mvn package   docker build
tj-user:   ██████████████████████████████████████████████
                          target/ 里有 tj-user.jar
                                                      
                    mvn clean    docker build(跑早了!)
tj-trade:  ██████████████████████████████████████████████
                          ↑ 此时 target/ 还没生成 tj-trade.jar
                            但 Dockerfile 的 COPY target/*.jar
                            读到了上一个构建残留的 tj-user.jar

tj-trade/
├── src/
├── target/
│   └── tj-trade.jar
├── Dockerfile          # 模块专属
└── pom.xml

# tj-trade/Dockerfile
FROM openjdk:11-jre-slim
WORKDIR /app
COPY target/tj-trade.jar app.jar     # 精确指定文件名
ENTRYPOINT ["sh", "-c", "java -jar app.jar"]

sh 'docker build -t tj-trade:latest ./tj-trade'

stage('Clean') {
    sh 'git clean -fdx'              // 清掉所有非 git 追踪的文件
    sh 'mvn clean'
}
stage('Build') {
    sh 'mvn package -pl tj-trade -am -DskipTests'
    sh 'docker build -t tj-trade:latest ./tj-trade'
}

# tj-trade/Dockerfile
FROM openjdk:11-jre-slim
WORKDIR /app
COPY target/tj-trade.jar app.jar

# 启动前校验：确认 jar 包里是正确的启动类
RUN jar tf app.jar | grep -q "com/tianji/trade/TradeApplication" \
    || (echo "ERROR: Wrong jar file!" && exit 1)

ENTRYPOINT ["sh", "-c", "java -jar app.jar"]

1. docker ps                    → 容器状态正常？
2. docker logs <容器> --tail 100 → 看启动类和注册名是否对
3. Nacos 控制台                  → 服务是否注册，实例数对不对
4. docker exec <容器> ls /app   → 容器里的 jar 文件名