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