Hadoop2.5.6搭建报错

 util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

解决办法：
yum install svn ncurses-devel gcc* lzo-devel zlib-devel autoconf automake libtool cmake openssl-devel
如果是root用户安装。分别在master和slave机器上面配置环境变量
vim /root/.bashrc

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
    . /etc/bashrc
fi
export JAVA_HOME=/usr/java/jdk1.7.0_80
export HADOOP_HOME=/home/hadoop-2.6.5
export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib  
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$HADOOP_HOME/lib"

报错：

ssh_exchange_identification: read: Connection reset by peer

解决办法：
vim /etc/hosts.allow
sshd:all