我有Spring Boot应用
我的Dockerfile是
FROM openjdk:8-jdk-alpine
EXPOSE 8080
ARG JAR_FILE=target/demo-0.0.1-SNAPSHOT.jar
ADD ${JAR_FILE} demo.jar
ENTRYPOINT ["java","-jar","/demo.jar"]
My docker compose file
# Docker Compose file Reference (https://docs.docker.com/compose/compose-file/)
version: '3.7'
# Define services
services:
# App backend service
app-server:
# Configuration for building the docker image for the backend service
build:
context: . # Use an image built from the specified dockerfile in the `polling-app-server` directory.
dockerfile: ./Dockerfile
container_name: empserver
ports:
- "3000:3000" # Forward the exposed port 8080 on the container to port 8080 on the host machine
restart: always
depends_on:
- db # This service depends on mysql. Start that first.
environment: # Pass environment variables to the service
SPRING_DATASOURCE_URL: jdbc:mysql://db:3306/employee_entries?useSSL=false&serverTimezone=UTC&useLegacyDatetimeCode=false
SPRING_DATASOURCE_USERNAME: root
SPRING_DATASOURCE_PASSWORD: root
# Database Service (Mysql)
db:
image: mysql:5.7
ports:
- "3306:3306"
restart: always
environment:
MYSQL_DATABASE: employee_entries
MYSQL_USER: root
MYSQL_PASSWORD: root
MYSQL_ROOT_PASSWORD: root
我的Docker网络正常工作
NETWORK ID NAME DRIVER SCOPE
b95e3d99b266 Default Switch ics local
7fff4f9713f8 demo_default nat local
fe8883b77d1d emp-mysql ics local
f464aab9064a nat nat local
a5bd5e8efe61 none null local
使用Java -jar target \ demo-0.0.1-SNAPSHOT.jar应用已成功运行
但是当我做docker-compose up
我遇到错误
app-server_1 | Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
app-server_1 |
app-server_1 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
app-server_1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_212]
app-server_1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_212]
app-server_1 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_212]
app-server_1 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_212]
app-server_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.NativeSession.connect(NativeSession.java:144) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:956) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | ... 56 common frames omitted
app-server_1 | Caused by: java.net.UnknownHostException: db
app-server_1 | at java.net.InetAddress.getAllByName0(InetAddress.java:1281) ~[na:1.8.0_212]
app-server_1 | at java.net.InetAddress.getAllByName(InetAddress.java:1193) ~[na:1.8.0_212]
app-server_1 | at java.net.InetAddress.getAllByName(InetAddress.java:1127) ~[na:1.8.0_212]
app-server_1 | at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:132) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
app-server_1 | ... 59 common frames omitted
我能够访问mysql数据库和表,但是从docker上无法访问
任何建议都会很有帮助
您需要向服务提供容器名称,并在相互引用它们时使用它们。在您的app-server的环境部分中,数据库的url指向127.0.0.1,但是数据库未与app-server在同一容器上运行,因此将失败。为此,请为服务提供容器名称,例如:my_mysql和my_app-server,并在环境URL中以jdbc:mysql:// my_mysql:3306的形式使用它。请在下面查看修改后的文件:
# Docker Compose file Reference (https://docs.docker.com/compose/compose-file/)
version: '3.7'
# Define services
services:
# App backend service
app-server:
# Configuration for building the docker image for the backend service
build:
context: . # Use an image built from the specified dockerfile in the `polling-app-server` directory.
dockerfile: ./Dockerfile
container_name: my_app-server
ports:
- "3000:3000" # Forward the exposed port 8080 on the container to port 8080 on the host machine
restart: always
depends_on:
- db # This service depends on mysql. Start that first.
environment: # Pass environment variables to the service
SPRING_DATASOURCE_URL: jdbc:mysql://my_mysql:3306/employee_entries?useSSL=false&serverTimezone=UTC&useLegacyDatetimeCode=false
SPRING_DATASOURCE_USERNAME: root
SPRING_DATASOURCE_PASSWORD: root
# Database Service (Mysql)
db:
image: mysql:5.7
container_name: my_mysql
ports:
- "3306:3306"
restart: always
environment:
MYSQL_DATABASE: employees
MYSQL_USER: root
MYSQL_PASSWORD: root
MYSQL_ROOT_PASSWORD: root