hadoop ssh免密登录

hosts的设置如下

[root@hadoop01 hadoop-2.7.7]# vi /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.216.111 hadoop01
192.168.216.112 hadoop02
192.168.216.113 hadoop03

在主机 输入ssh-keygen -t rsa，然后一直enter

[root@hadoop01 hadoop-2.7.7]#  ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
f2:b0:40:7f:38:b4:29:d0:05:91:51:05:93:a3:97:e5 root@hadoop01
The key's randomart image is:
+--[ RSA 2048]----+
|    +*=+.        |
|   ...o..        |
|  . o..=         |
|   o.oo+E        |
|    o.O S        |
|     o B         |
|      . .        |
|                 |
|                 |
+-----------------+
[root@hadoop01 hadoop-2.7.7]# ll ~/.ssh/
total 12
-rw-------. 1 root root 1675 Sep 29 23:15 id_rsa
-rw-r--r--. 1 root root  395 Sep 29 23:15 id_rsa.pub
-rw-r--r--. 1 root root 1998 Sep 23 06:36 known_hosts

设置ssh免密登录for 主集群服务器

[root@hadoop01 hadoop-2.7.7]# ssh-copy-id hadoop01
root@hadoop01's password: 
Now try logging into the machine, with "ssh 'hadoop01'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@hadoop01 hadoop-2.7.7]# ll ~/.ssh/
total 16
-rw-------. 1 root root  395 Sep 29 23:49 authorized_keys
-rw-------. 1 root root 1675 Sep 29 23:15 id_rsa
-rw-r--r--. 1 root root  395 Sep 29 23:15 id_rsa.pub
-rw-r--r--. 1 root root 1998 Sep 23 06:36 known_hosts
[root@hadoop01 hadoop-2.7.7]# ssh hadoop01
Last login: Sun Sep 29 23:46:51 2019 from hadoop01
[root@hadoop01 ~]# exit

设置免密登录for其他的集群，这样我们就可以免密登录所设置的集群了。

[root@hadoop01 hadoop-2.7.7]# ssh-copy-id hadoop02
root@hadoop02's password: 
Now try logging into the machine, with "ssh 'hadoop02'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@hadoop01 hadoop-2.7.7]# ssh-copy-id hadoop03
root@hadoop03's password: 
Now try logging into the machine, with "ssh 'hadoop03'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@hadoop01 hadoop-2.7.7]# ssh hadoop02
Last login: Sun Sep 29 23:50:30 2019 from hadoop01
[root@hadoop02 ~]# exit
logout
Connection to hadoop02 closed.
[root@hadoop01 hadoop-2.7.7]# stop-all.sh
This script is Deprecated. Instead use stop-dfs.sh and stop-yarn.sh
Stopping namenodes on [hadoop01]
hadoop01: stopping namenode
hadoop02: stopping datanode
hadoop03: stopping datanode
hadoop01: stopping datanode
Stopping secondary namenodes [hadoop01]
hadoop01: stopping secondarynamenode
stopping yarn daemons
stopping resourcemanager
hadoop02: stopping nodemanager
hadoop03: stopping nodemanager
hadoop01: stopping nodemanager
no proxyserver to stop
[root@hadoop01 hadoop-2.7.7]# jps
6961 Jps
[root@hadoop01 hadoop-2.7.7]# start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [hadoop01]
hadoop01: starting namenode, logging to /usr/local/hadoop-2.7.7/logs/hadoop-root-namenode-hadoop01.out
hadoop03: starting datanode, logging to /usr/local/hadoop-2.7.7/logs/hadoop-root-datanode-hadoop03.out
hadoop02: starting datanode, logging to /usr/local/hadoop-2.7.7/logs/hadoop-root-datanode-hadoop02.out
hadoop01: starting datanode, logging to /usr/local/hadoop-2.7.7/logs/hadoop-root-datanode-hadoop01.out
Starting secondary namenodes [hadoop01]
hadoop01: starting secondarynamenode, logging to /usr/local/hadoop-2.7.7/logs/hadoop-root-secondarynamenode-hadoop01.out
starting yarn daemons
starting resourcemanager, logging to /usr/local/hadoop-2.7.7/logs/yarn-root-resourcemanager-hadoop01.out
hadoop02: starting nodemanager, logging to /usr/local/hadoop-2.7.7/logs/yarn-root-nodemanager-hadoop02.out
hadoop03: starting nodemanager, logging to /usr/local/hadoop-2.7.7/logs/yarn-root-nodemanager-hadoop03.out
hadoop01: starting nodemanager, logging to /usr/local/hadoop-2.7.7/logs/yarn-root-nodemanager-hadoop01.out
[root@hadoop01 hadoop-2.7.7]# jps
7653 NodeManager
7741 Jps
7395 SecondaryNameNode
7228 DataNode
7547 ResourceManager
7092 NameNode
[root@hadoop01 hadoop-2.7.7]#