初入Hadoop，start-all.sh问题

Hadoop 版本：hadoop-2.6.5
环境：

HODOOP_HOME 目录也不同：都在各自用户的目录下
e.g:
/home/yann/hadoop
/home/ubuntu01/hadoop
/home/ubuntu02/hadoop

当我在启动的时候start-all.sh
提示我如下错误：
yann@yann-laptop:~/develop/tool/hadoop-2.6.5/sbin$ ./start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [yann-laptop]
yann-laptop: namenode running as process 7041. Stop it first.
yann@ubuntu01-virtual-machine's password: The authenticity of host 'ubuntu02-virtual-machine (192.168.2.182)' can't be established.
ECDSA key fingerprint is 57:ee:92:a8:85:85:ef:16:26:a3:b7:1d:54:77:19:18.
Are you sure you want to continue connecting (yes/no)?

hadoop/etc/hadoop/slaves:
ubuntu01-virtual-machine
ubuntu02-virtual-machine

SSH公钥已经配置好：
ssh-rsa XXXXX......XXXXXX yann@yann-laptop
ssh-rsa XXXXX......XXXXXX ubuntu01@ubuntu01-virtual-machine
ssh-rsa XXXXX......XXXXXX ubuntu02@ubuntu02-virtual-machine

从提示来看它使用了yann去连接ubuntu01-virtual-machine。

请问这种情况如何配置（主从机器不同的用户名）？