开启Hadoop2.6.0出现ssh无法解析主机名等错误提示的解决办法！

以下内容为转载，原文地址：http://shisiyou.blog.51cto.com/9864147/1608060

问题描述：

开启Hadoop时，出现如下信息：
[root@hd-m1 /]# ./hadoop/hadoop-2.6.0/sbin/start-all.sh 

This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh

15/01/23 20:23:41 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Starting namenodes on [Java HotSpot(TM) Client VM warning: You have loaded library /hadoop/hadoop-2.6.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

hd-m1]

sed: -e expression #1, char 6: unknown option to `s'

-c: Unknown cipher type 'cd'
hd-m1: starting namenode, logging to /hadoop/hadoop-2.6.0/logs/hadoop-root-namenode-hd-m1.out

HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Temporary failure in name resolution

Java: ssh: Could not resolve hostname Java: Temporary failure in name resolution

Client: ssh: Could not resolve hostname Client: Temporary failure in name resolution

You: ssh: Could not resolve hostname You: Temporary failure in name resolution

warning:: ssh: Could not resolve hostname warning:: Temporary failure in name resolution

VM: ssh: Could not resolve hostname VM: Temporary failure in name resolution

have: ssh: Could not resolve hostname have: Temporary failure in name resolution

library: ssh: Could not resolve hostname library: Temporary failure in name resolution

loaded: ssh: Could not resolve hostname loaded: Temporary failure in name resolution

might: ssh: Could not resolve hostname might: Temporary failure in name resolution

which: ssh: Could not resolve hostname which: Temporary failure in name resolution

have: ssh: Could not resolve hostname have: Temporary failure in name resolution

disabled: ssh: Could not resolve hostname disabled: Temporary failure in name resolution

stack: ssh: Could not resolve hostname stack: Temporary failure in name resolution

guard.: ssh: Could not resolve hostname guard.: Temporary failure in name resolution

VM: ssh: Could not resolve hostname VM: Temporary failure in name resolution

The: ssh: Could not resolve hostname The: Temporary failure in name resolution

try: ssh: Could not resolve hostname try: Temporary failure in name resolution

will: ssh: Could not resolve hostname will: Temporary failure in name resolution

to: ssh: Could not resolve hostname to: Temporary failure in name resolution

fix: ssh: Could not resolve hostname fix: Temporary failure in name resolution

the: ssh: Could not resolve hostname the: Temporary failure in name resolution
stack: ssh: Could not resolve hostname stack: Temporary failure in name resolution

guard: ssh: Could not resolve hostname guard: Temporary failure in name resolution

It's: ssh: Could not resolve hostname It's: Temporary failure in name resolution

now.: ssh: Could not resolve hostname now.: Temporary failure in name resolution

recommended: ssh: Could not resolve hostname recommended: Temporary failure in name resolution

highly: ssh: Could not resolve hostname highly: Temporary failure in name resolution

that: ssh: Could not resolve hostname that: Temporary failure in name resolution

you: ssh: Could not resolve hostname you: Temporary failure in name resolution

with: ssh: Could not resolve hostname with: Temporary failure in name resolution

'execstack: ssh: Could not resolve hostname 'execstack: Temporary failure in name resolution

the: ssh: Could not resolve hostname the: Temporary failure in name resolution

library: ssh: Could not resolve hostname library: Temporary failure in name resolution

fix: ssh: Could not resolve hostname fix: Temporary failure in name resolution

< libfile>',: ssh: Could not resolve hostname <libfile>',: Temporary failure in name resolution

or: ssh: Could not resolve hostname or: Temporary failure in name resolution

link: ssh: Could not resolve hostname link: Temporary failure in name resolution

it: ssh: Could not resolve hostname it: Temporary failure in name resolution
'-z: ssh: Could not resolve hostname '-z: Temporary failure in name resolution

with: ssh: Could not resolve hostname with: Temporary failure in name resolution

noexecstack'.: ssh: Could not resolve hostname noexecstack'.: Temporary failure in name resolution

hd-s1: starting datanode, logging to /hadoop/hadoop-2.6.0/logs/hadoop-root-datanode-hd-s1.out

hd-s2: starting datanode, logging to /hadoop/hadoop-2.6.0/logs/hadoop-root-datanode-hd-s2.out

Starting secondary namenodes [Java HotSpot(TM) Client VM warning: You have loaded library /hadoop/hadoop-2.6.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

SecondaryNameNode]

sed: -e expression #1, char 6: unknown option to `s'

-c: Unknown cipher type 'cd'

Client: ssh: Could not resolve hostname Client: Temporary failure in name resolution

have: ssh: Could not resolve hostname have: Temporary failure in name resolution

You: ssh: Could not resolve hostname You: Temporary failure in name resolution

Java: ssh: Could not resolve hostname Java: Temporary failure in name resolution

library: ssh: Could not resolve hostname library: Temporary failure in name resolution

loaded: ssh: Could not resolve hostname loaded: Temporary failure in name resolution

VM: ssh: Could not resolve hostname VM: Temporary failure in name resolution

might: ssh: Could not resolve hostname might: Temporary failure in name resolution

stack: ssh: Could not resolve hostname stack: Temporary failure in name resolution

have: ssh: Could not resolve hostname have: Temporary failure in name resolution

VM: ssh: Could not resolve hostname VM: Temporary failure in name resolution

fix: ssh: Could not resolve hostname fix: Temporary failure in name resolution

to: ssh: Could not resolve hostname to: Temporary failure in name resolution

the: ssh: Could not resolve hostname the: Temporary failure in name resolution

guard: ssh: Could not resolve hostname guard: Temporary failure in name resolution

now.: ssh: Could not resolve hostname now.: Temporary failure in name resolution

It's: ssh: Could not resolve hostname It's: Temporary failure in name resolution
disabled: ssh: Could not resolve hostname disabled: Temporary failure in name resolution

highly: ssh: Could not resolve hostname highly: Temporary failure in name resolution

that: ssh: Could not resolve hostname that: Temporary failure in name resolution
recommended: ssh: Could not resolve hostname recommended: Temporary failure in name resolution

stack: ssh: Could not resolve hostname stack: Temporary failure in name resolution
try: ssh: Could not resolve hostname try: Temporary failure in name resolution

HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Temporary failure in name resolution
fix: ssh: Could not resolve hostname fix: Temporary failure in name resolution

the: ssh: Could not resolve hostname the: Temporary failure in name resolution
library: ssh: Could not resolve hostname library: Temporary failure in name resolution

'execstack: ssh: Could not resolve hostname 'execstack: Temporary failure in name resolution

warning:: ssh: Could not resolve hostname warning:: Temporary failure in name resolution

with: ssh: Could not resolve hostname with: Temporary failure in name resolution

or: ssh: Could not resolve hostname or: Temporary failure in name resolution

< libfile>',: ssh: Could not resolve hostname <libfile>',: Temporary failure in name resolution

you: ssh: Could not resolve hostname you: Temporary failure in name resolution

link: ssh: Could not resolve hostname link: Temporary failure in name resolution

it: ssh: Could not resolve hostname it: Temporary failure in name resolution

which: ssh: Could not resolve hostname which: Temporary failure in name resolution

with: ssh: Could not resolve hostname with: Temporary failure in name resolution

The: ssh: Could not resolve hostname The: Temporary failure in name resolution

noexecstack'.: ssh: Could not resolve hostname noexecstack'.: Temporary failure in name resolution

'-z: ssh: Could not resolve hostname '-z: Temporary failure in name resolution

will: ssh: Could not resolve hostname will: Temporary failure in name resolution

SecondaryNameNode: ssh: Could not resolve hostname SecondaryNameNode: Temporary failure in name resolution
guard.: ssh: Could not resolve hostname guard.: Temporary failure in name resolution

15/01/23 20:24:48 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
starting yarn daemons

starting resourcemanager, logging to /hadoop/hadoop-2.6.0/logs/yarn-root-resourcemanager-hd-m1.out

hd-s1: starting nodemanager, logging to /hadoop/hadoop-2.6.0/logs/yarn-root-nodemanager-hd-s1.out

hd-s2: starting nodemanager, logging to /hadoop/hadoop-2.6.0/logs/yarn-root-nodemanager-hd-s2.out

解决办法：

出现上述问题主要是环境变量没设置好，在~/.bash_profile或者/etc/profile中加入以下语句就没问题了。

　　#vi /etc/profile或者vi ~/.bash_profile

　　　　export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native

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

然后用source重新编译使之生效即可！

　　#source /etc/profile或者source ~/.bash_profile