Hadoop2安装笔记可以参看：http://www.geedoo.info/hadoop2-development-environment-to-build-test.html 这里主要记录下hadoop安装和测试过程遇到的问题记录： 1.问题一 安装配置完成后执行start-dfs.sh出现如下异常： sed: -e expression #1, char 6: unkn
Hadoop2安装笔记可以参看：http://www.geedoo.info/hadoop2-development-environment-to-build-test.html
这里主要记录下hadoop安装和测试过程遇到的问题记录：
1.问题一
安装配置完成后执行start-dfs.sh出现如下异常：
sed: -e expression #1, char 6: unknown option to `s' have: ssh: Could not resolve hostname have: Name or service not known loaded: ssh: Could not resolve hostname loaded: Name or service not known VM: ssh: Could not resolve hostname VM: Name or service not known library: ssh: Could not resolve hostname library: Name or service not known which: ssh: Could not resolve hostname which: Name or service not known You: ssh: Could not resolve hostname You: Name or service not known stack: ssh: Could not resolve hostname stack: Name or service not known might: ssh: Could not resolve hostname might: Name or service not known have: ssh: Could not resolve hostname have: Name or service not known guard.: ssh: Could not resolve hostname guard.: Name or service not known Java: ssh: Could not resolve hostname Java: Name or service not known disabled: ssh: Could not resolve hostname disabled: Name or service not known The: ssh: Could not resolve hostname The: Name or service not known will: ssh: Could not resolve hostname will: Name or service not known VM: ssh: Could not resolve hostname VM: Name or service not known try: ssh: Could not resolve hostname try: Name or service not known the: ssh: Could not resolve hostname the: Name or service not known fix: ssh: Could not resolve hostname fix: Name or service not known stack: ssh: Could not resolve hostname stack: Name or service not known Server: ssh: Could not resolve hostname Server: Name or service not known guard: ssh: Could not resolve hostname guard: Name or service not known to: ssh: Could not resolve hostname to: Name or service not known 64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known you: ssh: Could not resolve hostname you: Name or service not known highly: ssh: Could not resolve hostname highly: Name or service not known -c: Unknown cipher type 'cd' fix: ssh: Could not resolve hostname fix: Name or service not known recommended: ssh: Could not resolve hostname recommended: Name or service not known that: ssh: Could not resolve hostname that: Name or service not known now.: ssh: Could not resolve hostname now.: Name or service not known library: ssh: Could not resolve hostname library: Name or service not known the: ssh: Could not resolve hostname the: Name or service not known link: ssh: Could not resolve hostname link: Name or service not known with: ssh: Could not resolve hostname with: Name or service not known or: ssh: Could not resolve hostname or: Name or service not known noexecstack'.: ssh: Could not resolve hostname noexecstack'.: Name or service not known with: ssh: Could not resolve hostname with: Name or service not known The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established. RSA key fingerprint is fa:8e:e6:aa:3f:f9:f0:0b:48:6e:40:ca:c2:f1:02:21. Are you sure you want to continue connecting (yes/no)? it: ssh: connect to host it port 22: Connection refused HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Name or service not known warning:: ssh: Could not resolve hostname warning:: Name or service not known
出现上述问题，之后谷歌了很久，大部分说是配置hosts的问题，检查之后没发现问题。
问题的原因是没有设置hadoop的native本地库。
解决方案：
输出native环境变量
export HADOOP_COMMON_LIB_NATIVE_DIR=/app/cloud/hadoop/hadoop-2.4.0/lib/native
参考
http://stackoverflow.com/questions/19943766/hadoop-unable-to-load-native-hadoop-library-for-your-platform-error-on-centos
http://stackoverflow.com/questions/19775808/messed-up-sed-syntactics-in-hadoop-startup-script-after-reinstalling-jvm
http://stackoverflow.com/questions/20011252/hadoop-2-2-0-64-bit-installing-but-cannot-start
原文地址：Hadoop2.x安装启动错误, 感谢原作者分享。
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