1、如果系統為64位，無法啟動啟動hdfs: ./sbin/start-dfs.sh。並有以下錯誤：

1. sed: -e expression #1, char 6: unknown option to `s‘
2. HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Name or service not known
3. 64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known
4. Java: ssh: Could not resolve hostname Java: Name or service not known
5. Server: ssh: Could not resolve hostname Server: Name or service not known
6. VM: ssh: Could not resolve hostname VM: Name or service not known

解決方法為：

1. vi etc/hadoop/hadoop-env.sh

加入：

1. export HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_PREFIX}/lib/native

　　修改:　 export HADOOP_OPTS="-Djava.library.path=$HADOOP_PREFIX/lib"

ssh: Could not resolve hostname問題終於解決了？