ubuntu localhost:ssh:connect to host localhost port 22:Connection refused

localhost: ssh: connect to host localhost port 22: Connection refused.

  1. 安装openssh-server：
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$ sudo apt-get install openssh-server
  1. 启动sshd服务 
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    $ sudo service start sshd
  2. 关闭防火墙，或允许防火墙开放22端口 
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    # 关闭
    $ sudo ufw disable

    # 允许开放22端口
    $ sudo ufw allow 22
  3. 检查： 
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    $ ssh localhost
    The authenticity of host 'localhost (127.0.0.1)' can't be established.
    ECDSA key fingerprint is SHA256:QjfgDMQrMms2YyootfWGBh5rFOWAgTxRHxDyRedmTTg.
    Are you sure you want to continue connecting (yes/no)? yes
    Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
    jack@localhost's password:

可以看到，我连自己的机器还需要输入密码，显然不友好，使用ssh-key解决：

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# 1.生成ssh key
ssh-keygen -t rsa

# 2.copy到本机
ssh-copy-id localhost