[Question] Failed to connect to mysql by jdbc

Describe the question I used the cluster mode to deploy DS. When I execute bash script/create-dolphinscheduler.sh to init the database, errors came out:

wangmingzhi@xxx:~/apache-dolphinscheduler-1.3.6-bin2$ bash script/create-dolphinscheduler.sh     
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.2.0 
10:20:45.942 [main] INFO ru.yandex.clickhouse.ClickHouseDriver - Driver registered
10:20:46.106 [main] ERROR com.alibaba.druid.pool.DruidDataSource - init datasource error, url: jdbc:mysql://202.168.126.69:3306/dolphinscheduler?characterEncoding=UTF-8&allowMultiQueries=true
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:425)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:342)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2197)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:778)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        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:425)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1644)
        at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:918)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1300)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1296)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:109)
        at org.apache.dolphinscheduler.dao.upgrade.UpgradeDao.getCurrentDbType(UpgradeDao.java:79)
        at org.apache.dolphinscheduler.dao.upgrade.UpgradeDao.<clinit>(UpgradeDao.java:48)
        at org.apache.dolphinscheduler.dao.upgrade.DolphinSchedulerManager.initUpgradeDao(DolphinSchedulerManager.java:37)
        at org.apache.dolphinscheduler.dao.upgrade.DolphinSchedulerManager.<init>(DolphinSchedulerManager.java:57)
        at org.apache.dolphinscheduler.dao.upgrade.shell.CreateDolphinScheduler.main(CreateDolphinScheduler.java:36)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:301)
        ... 23 common frames omitted

Now I deploy everything on the single machine to test cluster deployment. If everything is ok, then I will add more machines in. Mysql’s username and password is correct. I don’t know why this happened

Which version of DolphinScheduler: -[1.3.6-release]

[wangmingzhiJohn]

I changed the bind-address to 0.0.0.0 and it worked!

[tinyking]

I changed the bind-address to 0.0.0.0 and it worked!

@wangmingzhiJohn bind-address is mean only support it.