我在学习docker并尝试将使用Tomcat的Java Web应用程序放到容器中。我跟着一些基本的教程,但我发现没有解决方案能够正常工作给我。如果我跑我的数据库和Java容器出现错误:无法使用Docker将Java程序连接到MySQL
SEVERE: Unable to create initial connections of pool.
com.mysql.jdbc.exceptions.jdbc4.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 sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:339)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
MySQL的Dockerfile
FROM mysql:latest
ENV MYSQL_DATABASE=db_name #name of db that is required by Java program
运行方式:
docker run --name db_name -e MYSQL_ROOT_PASSWORD=root -d db_name
的Java Dockerfile
FROM tomcat:7.0.70-jre8
ADD deploy /usr/local/tomcat/webapps #extracted .war
ADD jdbc /usr/local/tomcat/lib #MySQL jdbc drivers
ADD context /usr/local/tomcat/conf #context.xml
通过运行:
docker run --name app_name --link db_name:db_name -p 8080:8080 -d app_name
当我在Eclipse中本地运行它时,整个配置正常运行。
什么是mysql_hostname或mysql连接字符串到java配置文件中? –
有 “URL =” 的jdbc:mysql的://本地主机:3306/DB_NAME”我改 “的jdbc:mysql的:// DB_NAME:3306/DB_NAME” 像@Ohmen建议和它的工作现在可以正确 – Marcon