无法使用JDBC连接到MySQL - 连接超时 - Ubuntu 9.04
我正在运行Ubuntu,并且最终尝试使用JDBC将Tomcat连接到我的MySQL数据库。
它以前工作过,但重新启动后,实例现在无法连接。
Tomcat 6和MySQL 5.0.75都在同一台机器上
连接字符串:jdbc:mysql:/// localhost:3306
我可以使用
mysql
命令在命令行上连接MySQL
my.cnf文件非常标准(可根据要求提供)具有绑定地址:127.0.0.1
尽管netstat说MySQL在监听,但我无法远程登陆MySQL端口
我有一个IpTables规则转发80 - > 8080并且没有我知道的防火墙。
我对此很陌生,我不确定还有什么可以测试。我不知道我是否应该在etc / interfaces中寻找,如果我做了什么寻找。它很奇怪,因为它曾经工作但重启后它已经失效所以我必须改变一些东西...... :)。
我意识到超时表明服务器没有响应,我认为这是因为请求实际上没有通过。我通过apt-get和Tomcat手动安装了MySQL。
MySqld进程
root@88:/var/log/mysql# ps -ef | grep mysqld
root 21753 1 0 May27 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe
mysql 21792 21753 0 May27 ? 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
root 21793 21753 0 May27 ? 00:00:00 logger -p daemon.err -t mysqld_safe -i -t mysqld
root 21888 13676 0 11:23 pts/1 00:00:00 grep mysqld
用netstat
root@88:/var/log/mysql# netstat -lnp | grep mysql
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 21792/mysqld
unix 2 [ ACC ] STREAM LISTENING 1926205077 21792/mysqld /var/run/mysqld/mysqld.sock
玩具连接类
root@88:~# cat TestConnect/TestConnection.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class TestConnection {
public static void main(String args[]) throws Exception {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
System.out.println("Got driver");
con = DriverManager.getConnection(
"jdbc:mysql:///localhost:3306",
"uname", "pass");
System.out.println("Got connection");
if(!con.isClosed())
System.out.println("Successfully connected to " +
"MySQL server using TCP/IP...");
} finally {
if(con != null)
con.close();
}
}
}
玩具连接类输出
注意:这与我从Tomcat获得的错误相同。
root@88:~/TestConnect# java -cp mysql-connector-java-5.1.12-bin.jar:. TestConnection
Got driver
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 1 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:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1122)
at TestConnection.main(TestConnection.java:14)
Caused by: 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:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1122)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2181)
... 12 more
Caused by: java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
... 13 more
Telnet输出
root@88:~/TestConnect# telnet localhost 3306
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection timed out
没有找到相关结果
已邀请:
4 个回复
襄挟款籍
以有效地禁用它,或者
并查看它是否进行了任何更改。
摊揉售
你可以试试telnet:
或JDBC连接到:
禽兢玫坞劲
代替
同样在unix / linux上,默认情况下,客户端/服务器通信是通过unix套接字文件完成的,而不是通过tcp / ip完成的。因此,您无法telnet到本地计算机上的端口3306。
碧肮械淌设