构建ssh信任关系 之前的配置也是可以的，但是我们为了统一 重新再来一次配置[hadoop@hadoop002 ~]$ rm -rf .ssh[hadoop@hadoop002 ~]$ ssh-keygenGenerating public/private rsa key pair.Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): Created directory '/home/hadoop/.ssh'.Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/hadoop/.ssh/id_rsa.Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.The key fingerprint is:ca:e4:a1:fc:9f:e2:86:e7:9c:ab:f2:19:7a:70:c5:3d hadoop@hadoop002The key's randomart image is:+--[ RSA 2048]----+| || || . . || o E || .o S. || ...= o || o+.+ || ..o=+. . || .++*B+o |+-----------------+[hadoop@hadoop002 ~]$ cd .ssh[hadoop@hadoop002 .ssh]$ lltotal 8-rw------- 1 hadoop hadoop 1675 Feb 16 20:27 id_rsa-rw-r--r-- 1 hadoop hadoop 398 Feb 16 20:27 id_rsa.pub[hadoop@hadoop002 .ssh]$ cat id_rsa.pub >> authorized_keys[hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ lltotal 12-rw-rw-r-- 1 hadoop hadoop 398 Feb 16 20:27 authorized_keys-rw------- 1 hadoop hadoop 1675 Feb 16 20:27 id_rsa-rw-r--r-- 1 hadoop hadoop 398 Feb 16 20:27 id_rsa.pub[hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ cd[hadoop@hadoop002 ~]$ cd app/hadoop-2.6.0-cdh5.7.0[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ sbin/start-dfs.sh 19/02/16 20:28:25 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicableStarting namenodes on [hadoop002]The authenticity of host 'hadoop002 (172.31.236.240)' can't be established.RSA key fingerprint is b1:94:33:ec:95:89:bf:06:3b:ef:30:2f:d7:8e:d2:4c.Are you sure you want to continue connecting (yes/no)? yeshadoop002: Warning: Permanently added 'hadoop002,172.31.236.240' (RSA) to the list of known hosts.hadoop@hadoop002's password:
[2]+ Stopped sbin/start-dfs.sh[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ ^C[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ jps962 Jps[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ ps -ef|grep start-dfs.shhadoop 790 349 0 20:25 pts/0 00:00:00 bash sbin/start-dfs.shhadoop 887 349 0 20:28 pts/0 00:00:00 bash sbin/start-dfs.shhadoop 977 349 0 20:28 pts/0 00:00:00 grep start-dfs.sh[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ [hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ kill -9 790 887[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ cd[1]- Killed sbin/start-dfs.sh (wd: ~/app/hadoop-2.6.0-cdh5.7.0)(wd now: ~)[2]+ Killed sbin/start-dfs.sh (wd: ~/app/hadoop-2.6.0-cdh5.7.0)(wd now: ~)[hadoop@hadoop002 ~]$ cd .ssh[hadoop@hadoop002 .ssh]$ lltotal 16-rw-rw-r-- 1 hadoop hadoop 398 Feb 16 20:27 authorized_keys-rw------- 1 hadoop hadoop 1675 Feb 16 20:27 id_rsa-rw-r--r-- 1 hadoop hadoop 398 Feb 16 20:27 id_rsa.pub-rw-r--r-- 1 hadoop hadoop 406 Feb 16 20:28 known_hosts[hadoop@hadoop002 .ssh]$ chmod 600 authorized_keys[hadoop@hadoop002 .ssh]$ [hadoop@hadoop002 .ssh]$ cd -/home/hadoop[hadoop@hadoop002 ~]$ cd app/hadoop-2.6.0-cdh5.7.0
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