https://blog.csdn.net/mcb520wf/article/details/83303792 随笔异常 ssh: Could not resolve hostname centos02: Temporary failure in name resolution 发现两台服务器如果进行ping操作可以进行ping通,然而却用主机名无法连接在ssh中也出现了问题. 解决方案: vi /etc/hosts 查看主机名和ip地址是否对应 source /etc/hosts…

hadoop启动journalnode时报错:localhost: ssh: Could not resolve hostname localhost: Temporary failure in name resolution 解决办法:将高亮部分补充到/etc/profile中,然后source生效 export JAVA_HOME=/opt/module/jdk1.8.0_144 export HADOOP_HOME=/opt/ha/hadoop-2.7.4 export HADOOP_CO…

这个错误是由于配置文件没有配置好.解决方案如下: 1 打开profile文件 vim /etc/profile 2 在文件最后加入的内容应该如下(高亮的两句一般是大家缺少的): export JAVA_HOME=/usr/java/jdk export HADOOP_HOME=/itcast/hadoop-2.6.4 export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/nativeexport HADOOP_OPTS="-Djava.libr…

报如错误:JAVA_HOME is not set and could not be found,可能是因为JAVA_HOME环境没配置正确,还有一种情况是即使各结点都正确地配置了JAVA_HOME,但在集群环境下还是报该错误,解决方法是显示地重新声明一遍JAVA_HOME 1.检查JAVA_HOME是否配置正确(伪分布式环境) 启动start-all.sh时报错,如下所示 解决方法: 输入java –version,查看jdk是否安装成功 输入export,查看jdk环境变量是否设置成功 2.…

本文转载自:http://blog.csdn.net/wodewutai17quiet/article/details/76795951 问题:hadoop启动时,报ssh: Could not resolve hostname xxx: Name or service not known 错误信息: [root@master hadoop-2.2.0]# sbin/start-dfs.sh 17/08/06 13:08:59 WARN util.NativeCodeLoader: Unable…

1.使用root配置的hadoop并启动会出现报错 错误:         Starting namenodes on [master]         ERROR: Attempting to operate on hdfs namenode as root                ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.                Starting datanodes…

项目启动报错:Access denied for user 'root'@'localhost' (using password:YES) 原因:root帐户默认不开放远程访问权限,所以需要修改一下相关权限 解决:通过修改root账户密码可解决,但是通常配置数据库用户时不建议使用root用户,最好是创建其他用户访问,数据源配置非root账户也可以解决此问题 mysql账户创建与授权参考:https://www.cnblogs.com/leskang/p/9772602.html…

启动Tomcat服务器报错: Several ports (8005, 8080, 8009) required by Tomcat v5.5 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to sto…

MySQL root密码重置报错:mysqladmin: connect to server at 'localhost' failed的解决方案   1  登陆失败,mysqladmin修改密码失败 [root@mysql var]# mysqladmin -u root password '123456' mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'loc…

eclipse运行hadoop程序报错:Connection refused: no further information log4j:WARN No appenders could be found for logger (org.apache.hadoop.conf.Configuration.deprecation). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging…