The authenticity of host ‘node01 (192.168.1.8)’ can’t be established.
详细报错：
[root@node01 hadoop-2.7.5]# sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /export/servers/hadoop-2.7.5/logs/yarn-root-resourcemanager-node01.out
The authenticity of host 'node01 (192.168.1.8)' can't be established.
ECDSA key fingerprint is SHA256:iKJRo2ZREDgqNVFlGFne/041Z3IFNyCtH+TiaP/5CO8.
ECDSA key fingerprint is MD5:25:c6:3c:ac:d0:92:ab:4f:21:74:70:5b:16:84:8c:03.
Are you sure you want to continue connecting (yes/no)? The authenticity of host 'node03 (192.168.1.10)' can't be established.
ECDSA key fingerprint is SHA256:iKJRo2ZREDgqNVFlGFne/041Z3IFNyCtH+TiaP/5CO8.
ECDSA key fingerprint is MD5:25:c6:3c:ac:d0:92:ab:4f:21:74:70:5b:16:84:8c:03.
Are you sure you want to continue connecting (yes/no)? The authenticity of host 'node02 (192.168.1.9)' can't be established.
ECDSA key fingerprint is SHA256:iKJRo2ZREDgqNVFlGFne/041Z3IFNyCtH+TiaP/5CO8.
ECDSA key fingerprint is MD5:25:c6:3c:ac:d0:92:ab:4f:21:74:70:5b:16:84:8c:03.
Are you sure you want to continue connecting (yes/no)? yes
node01: Warning: Permanently added 'node01' (ECDSA) to the list of known hosts.
node01: Authentication failed.
node03: Host key verification failed.
node02: Host key verification failed.
出现上述报错，主要是三台服务器间的免密码登录出现了问题。在搭建hadoop环境的时候，简单实现了node01可以免密码登录node02，node03，可是虚拟机之后再重新启动后，启动的时候，就出现了上述的问题。这次，配置了三台服务器间的免密码登录。
配置步骤：
1、首先，进入相应目录，删除原来生成的文件（三台服务器都需要删除）
#默认路径，可能是其他路径
cd ~/.ssh/
rm -rf *
2、分别在三台服务器上生产秘钥
ssh-keygen -t rsa
3、分别把node02和node03 上的 id_rsa.pub 通过scp复制到node01的.ssh目录下。
#分别在node02,node03上执行下面命令
scp id_rsa.pub root@node01:$PWD/id_rsa.pub2
#或
scp id_rsa.pub root@node01:$PWD/id_rsa.pub3
4、把公钥写入authorized_keys
cat id_rsa.pub >> authorized_keys
cat id_rsa.pub2 >> authorized_keys
cat id_rsa.pub3 >> authorized_keys
5、然后把authorized_keys在复制到node02和node03上
scp authorized_keys root@node02:$PWD
scp authorized_keys root@node03:$PWD
5、完成上述操作后，重新启动hadoop即可。
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