无法启动start-all.sh

[root@hadoop conf]# start-all.sh

Warning: $HADOOP_HOME is deprecated.

starting namenode, logging to /opt/hadoop/libexec/../logs/hadoop-root-namenode-hadoop.out

The authenticity of host 'localhost (::1)' can't be established.

RSA key fingerprint is 8e:c9:f3:43:61:56:7a:c6:41:70:4e:e7:be:ae:8f:0f.

Are you sure you want to continue connecting (yes/no)? 

localhost: Host key verification failed.

The authenticity of host 'localhost (::1)' can't be established.

RSA key fingerprint is 8e:c9:f3:43:61:56:7a:c6:41:70:4e:e7:be:ae:8f:0f.

Are you sure you want to continue connecting (yes/no)? 

localhost: Host key verification failed.

starting jobtracker, logging to /opt/hadoop/libexec/../logs/hadoop-root-jobtracker-hadoop.out

The authenticity of host 'localhost (::1)' can't be established.

RSA key fingerprint is 8e:c9:f3:43:61:56:7a:c6:41:70:4e:e7:be:ae:8f:0f.

Are you sure you want to continue connecting (yes/no)? 

localhost: Host key verification failed.