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_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native

export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"

export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin

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