Question

我尝试将在tomcat 8上运行的Web应用程序连接到oracle数据库。它们都作为Docker容器运行：

搬运工-compose.yml：

version: "3"
services:
  appweb:
   build: ./app
   image: "servlet-search-app:0.1"
   ports:
    - "8888:8080"
   links:
    - appdb
   environment:
    - DATA_SOURCE_NAME="jdbc:oracle:thin:@appdb:1521/XE"

  appdb:
   build: ./db
   image: "servlet-search-db:0.1"
   ports:
    - "49160:22"
    - "1521:1521"
    - "8889:8080"

我的oracle DB映像的Dockerfile（build：./ db）：

FROM wnameless/oracle-xe-11g
ADD createUser.sql /docker-entrypoint-initdb.d/
ENV ORACLE_ALLOW_REMOTE=true

tomcat图像的Dockerfile（build：./ app）

FROM tomcat:8.0.20-jre8
COPY servlet.war /usr/local/tomcat/webapps/
COPY ojdbc14-1.0.jar /usr/local/tomcat/lib/

因此应用程序按预期启动，但在尝试连接数据库时抛出异常：

java.lang.IllegalStateException: java.sql.SQLException: Io exception: Invalid connection string format, a valid format is: "host:port:sid" 
    org.se.lab.ui.ControllerServlet.createConnection(ControllerServlet.java:115)
    org.se.lab.ui.ControllerServlet.handleSearch(ControllerServlet.java:78)
    org.se.lab.ui.ControllerServlet.doPost(ControllerServlet.java:53)
    org.se.lab.ui.ControllerServlet.doGet(ControllerServlet.java:38)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

现在问题显而易见，但是当我将DATA_SOURCE_NAME字符串修复为：

时

DATA_SOURCE_NAME="jdbc:oracle:thin:@appdb:1521:XE"

我得到以下异常：

java.lang.IllegalStateException: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
appdb:1521:XE"

    org.se.lab.ui.ControllerServlet.createConnection(ControllerServlet.java:115)
    org.se.lab.ui.ControllerServlet.handleSearch(ControllerServlet.java:78)
    org.se.lab.ui.ControllerServlet.doPost(ControllerServlet.java:53)
    org.se.lab.ui.ControllerServlet.doGet(ControllerServlet.java:38)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

现在我试图找出其中哪一个应该真正起作用。因此，我只启动了数据库容器：

docker build -t dbtest .
docker run -it -d --rm -p 1521:1521 --name dbtest dbtest
docker inspect dbtest | grep IPAddress
>> "IPAddress": "172.17.0.4"

接下来，我尝试连接sqlplus：

sqlplus system/oracle@172.17.0.4:1521/XE # works
sqlplus system/oracle@172.17.0.4:1521:XE #ERROR: ORA-12545: Connect failed because target host or object does not exist

那么问题是什么？由于docker-compose文件中的链接，tomcat容器可以解析＆＃34; appdb＆＃34;到容器的IP。

这里应该建立连接的代码：

protected Connection createConnection() {
        String datasource = System.getenv("DATA_SOURCE_NAME");
        try {
            // debug
            InetAddress address = null;
            try {
                address = InetAddress.getByName("appdb");
                System.out.println(address); // resolves in appdb/10.0.0.2
                System.out.println(address.getHostAddress()); // resolves in 10.0.0.2
            } catch (UnknownHostException e) {
                e.printStackTrace();
            }

            Class.forName("oracle.jdbc.driver.OracleDriver");
            return DriverManager.getConnection(datasource, "system", "oracle");
        } catch (SQLException | ClassNotFoundException e) {
            throw new IllegalStateException(e);
        }
    }

最后这里是tnsnames.ora文件：

 cat $ORACLE_HOME/network/admin/tnsnames.ora
# tnsnames.ora Network Configuration File:

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = fcffb044d69d)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

谢谢！

Answer 1

oracle默认侦听器将配置的主机解析为错误的IP地址：

vim $ ORACLE_HOME / network / admin / listener.ora：

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/xe)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = f4c4a3638c11)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

HOST值是Docker容器ID。如果我们查看/ etc / hosts，它会在docker-compose链接中正确设置服务链接：

10.0.0.5        f4c4a3638c11

它也可以从tomcat容器中正确解析

ping f4c4a3638c11
PING f4c4a3638c11 (10.0.0.5): 56 data bytes
...

如果我尝试连接其他接口的IP地址（即主机系统的docker接口），则从Web应用程序到数据库的连接正常工作

String datasource = "jdbc:oracle:thin:@172.17.0.4:1521:XE";

因此，解决方案是配置侦听器以侦听正确的IP地址

(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.5)(PORT = 1521))

现在这个连接字符串有效：

jdbc:oracle:thin:@appdb:1521:XE

我会将此行为报告给wnameless / oracle-xe-11g作为错误

Answer 2

对不起，这不是一个明确的答案。让我们将其视为长篇评论：）

您的设置非常复杂，我可以重新创建，但您的错误消息很有趣：

The Connection descriptor used by the client was:
appdb:1521:XE"
...

看起来环境值被切割为appdb:1521:XE。如果你尝试硬编码怎么样：

String datasource = "jdbc:oracle:thin:@appdb:1521/XE";

如果可行，那么可能需要以某种方式逃避您的docker DATA_SOURCE_NAME环境变量。

我可能完全错了，但我认为值得一试。

Docker容器之间的JDBC连接（docker-compose）

2 个答案: