ssh连接localhost被拒绝的解决方法

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在终端输入ssh localhost
报的这样的错
ssh: connect to host localhost port 22: Connection refused
按照hadoop官网上的操作配置好ssh以后还是报这个错误
查看Linux机器上的ssh应该是只有ssh远程访问的客户端，而没有ssh-server，所以需要安装openssh-server

sudo apt-get install openssh-server
ssh localhost

The authenticity of host ‘localhost (127.0.0.1)’ can’t be established.
ECDSA key fingerprint is SHA256:XsfMvgjvI+PYquEdgGRRHg6AGAyPVong/vLtGMzxWZk.
Are you sure you want to continue connecting (yes/no)? no

然后就搞定了．