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本地主机无法连接到 127.0.0.1

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本地主机无法连接到 127.0.0.1

我有一些 Java 系统，我想在其中使用 Hadoop，但每当我使用此命令连接到本地主机时

hadoop fs -ls /

它总是会提示

java.net.UnknownHostException: local.localdomain: diginiqlinux.localdomain
at java.net.InetAddress.getLocalHost(InetAddress.java:1466)

编辑

这是我的 //etc/hosts

127.0.0.1 localhost

完整跟踪日志

[root@diginiqlinux ~]# hadoop fs -ls
13/12/30 16:44:36 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException: diginiqlinux.localdomain: diginiqlinux.localdomai                                                                                        n
        at java.net.InetAddress.getLocalHost(InetAddress.java:1466)
        at org.apache.hadoop.metrics.MetricsUtil.getHostName(MetricsUtil.java:91                                                                                        )
        at org.apache.hadoop.metrics.MetricsUtil.createRecord(MetricsUtil.java:8                                                                                        0)
        at org.apache.hadoop.security.UserGroupInformation$UgiMetrics.<init>(Use                                                                                        rGroupInformation.java:102)
        at org.apache.hadoop.security.UserGroupInformation.<clinit>(UserGroupInf                                                                                        ormation.java:208)
        at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1757                                                                                        )
        at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1750                                                                                        )
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1618)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:255)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:124)
        at org.apache.hadoop.fs.FsShell.init(FsShell.java:86)
        at org.apache.hadoop.fs.FsShell.run(FsShell.java:1813)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
        at org.apache.hadoop.fs.FsShell.main(FsShell.java:1974)
Caused by: java.net.UnknownHostException: diginiqlinux.localdomain
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:894)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:128                                                                                        6)
        at java.net.InetAddress.getLocalHost(InetAddress.java:1462)
        ... 14 more
ls: Cannot access .: No such file or directory.

有什么解决方案可以连接本地主机吗？

答案1

在文件中为 localhost 添加条目 127.0.0.1 /etc/hosts。

127.0.0.1 localhost

答案2

在 /etc/hosts 文件中，可能有一行127.0.1.1 [hostname]。我会将其更改为127.0.0.1 [hostname]。我相信这是 sudo 正常工作所必需的，并且通常存在问题。 http://wiki.apache.org/hadoop/ConnectionRefused core-site.xml 也可以使用localhost或hostname，确保其配置正确。

<property>
  <name>fs.defaultFS</name>
  <value>hdfs://[hostname]:9000</value>
</property>

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