[英]Docker - MySQL and Java container connectivity error
我正在嘗試使用 JAVA 和 MySQL 創建一個微服務的簡單任務。 我在 Windows 10 上使用 docker-compose 和 Docker 桌面。
Client: Docker Engine - Community
Version: 19.03.5
API version: 1.40
Server: Docker Engine - Community
Engine:
Version: 19.03.5
API version: 1.40 (minimum version 1.12)
我的 docker-compose.yml 是
version: '3.1'
services:
db:
#image: mysql:5.7.22
image: mysql:latest
ports: ["3306:3306"]
hostname: db
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=Users
container_name: mysqldatabase
web:
build: docker-mysql-connector
image: docker-mysql-connector
hostname: web
tty: true
depends_on:
- db
links:
- db:db
我檢查連接性的 JAVA 代碼是
package com.prasad.docker.mysql;
import java.net.InetAddress;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Map;
public class MySQLConnection {
public static void main(String[] args) throws Exception {
String ipAddr = InetAddress.getLocalHost().getHostName();
System.out.println("Printing IP address of the host " + ipAddr);
Map<String, String> env = System.getenv();
for (String envName : env.keySet()) {
System.out.format("%s=%s%n", envName, env.get(envName));
}
Thread.sleep(10000);
boolean connected = false;
while (!connected) {
try {
String url = "jdbc:mysql://db:3306/Users?autoReconnect=false&useSSL=false";
String user = "root";
String password = "root";
System.out.println("Connecting to URL " + url);
Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
Connection conn = DriverManager.getConnection(url, user, password);
System.out.println("Connection was successful");
connected = true;
} catch (Exception e) {
System.err.println("Error connecting to database");
e.printStackTrace();
Thread.sleep(5000);
}
}
}
}
當我 output 運行 JAVA ode 的 web 容器的日志時出現以下錯誤
Connecting to URL jdbc:mysql://db:3306/Users?autoReconnect=false&useSSL=false
Error connecting to database
com.mysql.cj.jdbc.exceptions.CommunicationsException: 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 com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:590)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:57)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606)
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:633)
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at com.prasad.docker.mysql.MySQLConnection.main(MySQLConnection.java:34)
Caused by: com.mysql.cj.core.exceptions.CJCommunicationsException: Communications link failure
我能夠從容器內的 MySQL Workbench 和 MySQL 數據庫成功測試連接。 我只從 JAVA 代碼中得到連接錯誤。 我嘗試使用 MySQL 數據庫的最新版本和 v5.7.22。 兩種情況下的錯誤相同。 任何幫助表示贊賞
您是否提到該實例適用於本地主機?
version: '3.1'
services:
db:
#image: mysql:5.7.22
image: mysql:latest
ports: ["3306:3306"]
hostname: db
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=Users
container_name: mysqldatabase
web:
build: docker-mysql-connector
image: docker-mysql-connector
hostname: web
tty: true
depends_on:
- db
links:
- db:db
environment:
SPRING_DATASOURCE_URL: jdbc:mysql://docker-mysql:3306/database?autoReconnect=true&useSSL=false
另外添加network_mode: "host"
也會有所幫助。
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