Docker 微服务镜像无法连接到本地 MySQL 服务器答案

【问题标题】：Docker Micro service image Cant connect to local MySQL serverDocker 微服务镜像无法连接到本地 MySQL 服务器
【发布时间】：2019-10-08 11:51:36
【问题描述】：

这就是我在 application.properties 文件中配置 MySQL 的方式

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/roaming
spring.datasource.username=root
spring.datasource.password=root
  #spring.datasource.initialization-mode=always
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=validate
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

这些是我在 docker 中的图像。共有三个图像。当我尝试运行漫游映像时，它无法连接到我的本地机器 MySQL 服务器。目前它使用 Xampp 服务器运行

D:\Dialog\Applications\Roming\deployment>docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
roaming             v1                  b7cd90208bcb        17 hours ago        695MB
java                8                   d23bdf5b1b1b        2 years ago         643MB

我有一个在 docker 容器内运行的微服务映像，当我尝试执行以下命令时 docker run -t roaming:v1 它给出了以下错误

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:353) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:562) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.3.1.jar!/:na]
        at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.3.1.jar!/:na]
        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.4.2.Final.jar!/:5.4.2.Final]
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.4.2.Final.jar!/:5.4.2.Final]
        at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:43) ~[hibernate-core-5.4.2.Final.jar!/:5.4.2.Final]
        ... 43 common frames omitted
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_111]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_111]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_111]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_111]
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.NativeSession.connect(NativeSession.java:152) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:955) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        ... 56 common frames omitted
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_111]
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_111]
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_111]
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_111]
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_111]
        at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_111]
        at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
        ... 59 common frames omitted

和我的Docker文件如下

FROM java:8

ADD roaminglistener-0.0.1-SNAPSHOT.jar roaminglistener-0.0.1-SNAPSHOT.jar

WORKDIR /

EXPOSE 8080

ENTRYPOINT ["java","-Dspring.profiles.active=dev","-jar","roaminglistener-0.0.1-SNAPSHOT.jar"]

【问题讨论】：

你是如何在代码中为connection localhost string配置的？
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/roaming spring.datasource.username=root spring.datasource.password=root #spring.datasource.initialization-mode=总是 spring.jpa.show-sql=true spring.jpa.hibernate.ddl-auto=validate spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect 这就是我在 application.properties 文件中配置的方式@ ThanhNguyenVan
你需要使用 Docker Networking 创建 Inter Docker Container Communication
使用此链接javainuse.com/devOps/docker/docker-networking
数据库是在不同的容器中运行，还是在同一主机上的 Docker 外部运行？

标签： mysql docker microservices

【解决方案1】：

如果你想从一个容器连接到主机，你必须运行一个带有--network host 选项的容器。更多details here。

【讨论】：

【解决方案2】：

在 spring.datasource.url 中使用 host.docker.internal 而不是 localhost

【讨论】：

【解决方案3】：

在容器中：

127.0.0.1 是本地容器的意思。如果要在主机中连接 MySQL 服务器。（在容器外但与容器相同的主机）

应配置：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/roaming

改为：

spring.datasource.url=jdbc:mysql://172.17.0.1:3306/roaming

172.17.0.1是容器网络的默认ip网关。

【讨论】：