我尝试将运行在tomcat 8上的web应用程序连接到oracle数据库。他们都运行的Docker容器:Docker容器之间的JDBC连接(docker-compose)
泊坞窗,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"
Dockerfile我预言的DB图像(编译:./db):
FROM wnameless/oracle-xe-11g
ADD createUser.sql /docker-entrypoint-initdb.d/
ENV ORACLE_ALLOW_REMOTE=true
Dockerfile的Tomcat image(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,但在尝试连接时引发异常t Ø数据库:
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)
现在这个问题似乎很明显,但是当我修复DATA_SOURCE_NAME字符串:
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)
现在我试着找出他们中的哪一个应该实际工作。于是,我开始只有DB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,我尝试用sqlplus连接:
sqlplus system/[email protected]:1521/XE # works
sqlplus system/[email protected]:1521:XE #ERROR: ORA-12545: Connect failed because target host or object does not exist
那么,有什么问题呢?由于docker-compose文件中的链接,tomcat容器可以将“appdb”解析为容器的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);
}
}
最后这里的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!
我想你将不得不尝试连接没有码头图像/容器首先确保与数据库连接建立? – JBone