All host(s) tried for query failed (tried: / ip :9042
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在使用java编程的驱动代码远程连接linux上cassandra的时候出现了连接不上的问题，
接着讲 selinux 与 防火墙都关闭了，发现还是不行。
All host(s) tried for query failed (tried: /ip (com.datastax.driver.core.TransportException：[/ip] Cannot connect), /ip (com.datastax.driver.core.TransportException: [/ip] Cannot connect))
最后由于的远程连接，应该修改
如果需要远程连接，那么cassandra.yaml里面的rpc_address就需要改变为您当前环境实际的IP地址，否则会报错！
修改后就可以了！
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