1、在实际生产环境中为Hadoop配置无秘钥登录非常有必要
# 在没有配置时：
[liuwl@linux-66-64 hadoop-2.5.0]$ jps
26163 Jps
[liuwl@linux-66-64 hadoop-2.5.0]$ sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /home/liuwl/opt/modules/hadoop-2.5.0/logs/yarn-liuwl-resourcemanager-linux-66-64.liuwl.com.out
liuwl@linux-66-64.liuwl.com's password: # 启动 nodemanager 需要密码
linux-66-64.liuwl.com: starting nodemanager, logging to /home/liuwl/opt/modules/hadoop-2.5.0/logs/yarn-liuwl-nodemanager-linux-66-64.liuwl.com.out
[liuwl@linux-66-64 hadoop-2.5.0]$ jps
27134 ResourceManager
27475 Jps
27417 NodeManager
[liuwl@linux-66-64 hadoop-2.5.0]$ sbin/stop-yarn.sh
stopping yarn daemons
stopping resourcemanager
liuwl@linux-66-64.liuwl.com's password: # 关闭 nodemanager 需要密码
linux-66-64.liuwl.com: stopping nodemanager
no proxyserver to stop
# 可想,实际生产中无秘钥登录的重要性
2、生成公钥与私钥
# 做好无秘钥登录用户选择(在每个用户下都会有个二.ssh文件夹,默认为空)
[liuwl@linux-66-64 .ssh]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/liuwl/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/liuwl/.ssh/id_rsa.
Your public key has been saved in /home/liuwl/.ssh/id_rsa.pub.
The key fingerprint is:
12:26:91:a1:da:29:91:a7:ec:3e:1a:f6:92:f5:7d:cc liuwl@linux-66-64.liuwl.com
The key's randomart image is:
+--[ RSA 2048]----+
| oo |
| . ... |
|o o . o |
|.* . o . |
|+.o . S |
|.. . . |
|.oo . . o |
|o=. . . E |
|o.o. . |
+-----------------+
[liuwl@linux-66-64 .ssh]$ ls
id_rsa id_rsa.pub # 私钥与公钥
3、发送到节点(机器)上
[liuwl@linux-66-64 .ssh]$ hostname
linux-66-64.liuwl.com
[liuwl@linux-66-64 .ssh]$ ssh-copy-id linux-66-64.liuwl.com
The authenticity of host 'linux-66-64.liuwl.com (192.168.0.111)' can't be established. # 第一次设置需要提示是否确定
RSA key fingerprint is 93:26:f9:f8:57:d1:0d:cb:5f:69:87:26:f6:77:f8:e0.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'linux-66-64.liuwl.com,192.168.0.111' (RSA) to the list of known hosts.
liuwl@linux-66-64.liuwl.com's password: # 输入密码
Now try logging into the machine, with "ssh 'linux-66-64.liuwl.com'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. [liuwl@linux-66-64 .ssh]$ ls
authorized_keys id_rsa id_rsa.pub known_hosts # authorized_keys 也是公钥,注意秘钥权限不能随便乱改
[liuwl@linux-66-64 .ssh]$ ll
total 16
-rw------- 1 liuwl liuwl 409 Oct 14 00:43 authorized_keys
-rw------- 1 liuwl liuwl 1675 Oct 14 00:40 id_rsa
-rw-r--r-- 1 liuwl liuwl 409 Oct 14 00:40 id_rsa.pub
-rw-r--r-- 1 liuwl liuwl 417 Oct 14 00:43 known_hosts [liuwl@linux-66-64 .ssh]$ cat authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA5d/DiNJ8BRdsoTlfZqMMY+RUWeUel9oOfSGg/EdVifgryHHpUGc/PziuDZAZb0R/zV9HebYgIZ8YDsJvUOZleUP6n2p+8kRqJGsKCru2lM8lVPtkICZq+KUHHzMvavgwa2K6r9kITc1LMr8plBzdfPkN4uygYK6otLdlAn9qAGAv47FTGcbMJuUhB4e3MKqVg5z5ZFI3FRE3MmLoazVLQ3kCOHlSzUdmJ9ZyAQRdSP9OTSbtL81KSxFIJbvgZ2qoTDL26mjg4rTntvwyXoxPWQ/9twWbJ9Sov1k1SZVHfZ8XnHFsCTF0YzFrxD/UZQUpWnR5/T+/cR2mtU/n08+rtQ== liuwl@linux-66-64.liuwl.com
[liuwl@linux-66-64 .ssh]$ cat known_hosts
linux-66-64.liuwl.com,192.168.0.111 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuJR7MP7Bo21+OGDD2GKGYuyJoJKlDOfrIWQwClCsEn2tdgRW0IFAQkIgo4bcaRTUxJ8ctJom3Qi+NykIe1lqMA2ONTcclNKh/a8teXvd/DOhnol+OXJypL/S2vSRviR/QOerq7KWXiixzAjxBSTQtvYvMBY/fGfHu6wXy/DVViaTu0MdsWLAQlpwkfRe+D0rlDJIQqVTemdX8zxqPsEednlDuk7YlntC1e/A3bds2r2hGLX6PV8M9g5ef3dmw3s5LZD89Bh/8LlzEr42zEGApgKICrn+Wm8FCbrG2BrUOOz3srf4Y2aaNicZ4sm0X8FepPDYUWKW7lFxLv4YLRcG1w==
[liuwl@linux-66-64 .ssh]$ cat id_rsa
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
[liuwl@linux-66-64 .ssh]$ cat id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA5d/DiNJ8BRdsoTlfZqMMY+RUWeUel9oOfSGg/EdVifgryHHpUGc/PziuDZAZb0R/zV9HebYgIZ8YDsJvUOZleUP6n2p+8kRqJGsKCru2lM8lVPtkICZq+KUHHzMvavgwa2K6r9kITc1LMr8plBzdfPkN4uygYK6otLdlAn9qAGAv47FTGcbMJuUhB4e3MKqVg5z5ZFI3FRE3MmLoazVLQ3kCOHlSzUdmJ9ZyAQRdSP9OTSbtL81KSxFIJbvgZ2qoTDL26mjg4rTntvwyXoxPWQ/9twWbJ9Sov1k1SZVHfZ8XnHFsCTF0YzFrxD/UZQUpWnR5/T+/cR2mtU/n08+rtQ== liuwl@linux-66-64.liuwl.com
4、测试一下
[liuwl@linux-66-64 hadoop-2.5.0]$ sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /home/liuwl/opt/modules/hadoop-2.5.0/logs/yarn-liuwl-resourcemanager-linux-66-64.liuwl.com.out
linux-66-64.liuwl.com: starting nodemanager, logging to /home/liuwl/opt/modules/hadoop-2.5.0/logs/yarn-liuwl-nodemanager-linux-66-64.liuwl.com.out
[liuwl@linux-66-64 hadoop-2.5.0]$ jps
25171 NodeManager
25072 ResourceManager
25331 Jps
OK！