我的CSDN部落格位址:[url]http://blog.csdn.net/qidong7[/url]
[b]為Hadoop叢集安裝SSH[/b]
一、驗證是否安裝了ssh
[[email protected] /]# which ssh
/usr/bin/ssh
[[email protected] /]# which sshd
/usr/sbin/sshd
[[email protected] /]# which ssh-keygen
/usr/bin/ssh-keygen
如果收到類似這樣的錯誤資訊
/usr/bin/which no ssh in (/usr/bin:/bin:/usr/bin...
您可以通過Linux安裝包管理器安裝OpenSSH(www.openssh.com)或者直接下載下傳源碼。
二、生成SSH密鑰對
務必要避免輸入密碼,否則,主節點每次試圖通路其他節點時,你都得手動輸入這個密碼
[[email protected] /]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop-user/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop-user/.ssh/id_rsa.
Your public key has been saved in /home/hadoop-user/.ssh/id_rsa.pub.
The key fingerprint is:
2e:e1:91:cf:85:48:f9:92:8f:2d:e5:36:92:15:e0:1a [email protected]
The key's randomart image is:
+--[ RSA 2048]----+
| . |
| . o |
| E + . |
| + = o |
| . B S . |
| . / . |
| B X |
| = . |
| |
+-----------------+
生成密鑰對之後,公鑰的形式為:
[[email protected] /]#
more /home/hadoop-user/.ssh/id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA0pmwcaf/xgUrDQfK4ZePQEqjXhYPSV2iUsRxunk20RxerLOpw5SNJ+3gb2jVSnuncAlABkS
yi8VCCJVmV4b0y6kCP6ap9jdcRJhxLB33zd5IyHMyo9zjdo8j2xRnFtv1SfaqkhIt8/By1E2+Si3dlIE61DhRGtdxGJNkVv0O4+8AANKcEk
C5LK8Hr+pEBBVlM9m9OHYJ9GdekQcMQQC/CtrZohzHznDm70tJ1EtnidYdUcBz31FuOfeJjuEapbkn6Az9HwDEQD8cemtED0QK/aW9FLjko
zid5nLjJ7ZJwmkmq5V3rLSE2AbqGnGtYSYCezJFFHmUpNyG35vYjpGj....
三、将密鑰公布(本人的target為localhost)
[[email protected] hadoop-1.2.0]# scp ~/.ssh/id_rsa.pub [email protected]:~/master_key
[[email protected] /]# ssh localhost
Last login: Sat Jun 1 18:12:59 2013 from 192.168.1.102
四、安裝hadoop
1、 解壓
tar xzvf hadoop-1.2.0.tar.gz
2、配置 Hadoop
2.1 . 配置JDK
[b]hadoop-env.sh[/b]
export JAVA_HOME=/usr/java/jdk1.7.0_17
2.2 . 配置conf/core-site.xml、conf/hdfs-site.xml、conf/mapred-site.xml檔案
[b]core-site.xml[/b]
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/app/hadoop-hdfs</value>
</property>
</configuration>
[b]hdfs-site.xml[/b]
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
[b]mapred-site.xml[/b]
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
</configuration>
3、啟動hadoop
cd /home/brain/hadoop-1.2.0/bin
1.格式化檔案系統
./hadoop namenode –format
2. 啟動/關閉 hadoop
啟動所有任務start-all.sh/stop-all.sh
啟動關閉HDFS: start-dfs.sh/stop-dfs.sh
啟動關閉MapReduce: start-mapred.sh/stop-mapred.sh
3. 用jps指令檢視程序,確定有
namenode,
dataNode,
JobTracker,
TaskTracker
如果沒有namenode ,
1、先運作stop-all.sh
2、格式化namdenode,不過在這之前要先删除原目錄,即core-site.xml下配置 的<name>hadoop.tmp.dir</name>所指向的目錄,然後運作 hadoop namenode -format
3、運作start-all.sh
4、檢查執行
通路
http://192.168.1.77:50030 (MapReduce的Web頁面)
http://192.168.1.77:50070 (HDfS的web頁面)
本人安裝過程中出現沒有namenode,格式化後仍然沒有,這時可以檢視下日志,發現端口被占。
有問題檢視日志 HADOOP_HOME/logs/
另外如果通路
http://192.168.1.77:50030 通路不到,可能是防火牆的原因,可以關閉防火牆,再次通路
service iptables stop
如果是,修改防火牆配置,對50030端口不監控;
修改防火牆監控端口
vi /etc/sysconfig/iptables
中加
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 50030 -j ACCEPT
就不對50030端口進行監控了
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