【Shell】ssh

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connection refused

https://askubuntu.com/questions/30080/how-to-solve-connection-refused-errors-in-ssh-connection

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sudo apt-get install openssh-server openssh-client

将 ssh keys 复制到 user@host 以启用无密码 SSH 登录。

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$ssh-copy-id user@host

将本地的文本文件保存到远程服务端中

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cat ~/.ssh/id_rsa.pub | ssh user@123.45.56.78 "mkdir -p ~/.ssh && cat >>  ~/.ssh/authorized_keys"
https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys--2

bash - How can I ssh directly to a particular directory? - Stack Overflow

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ssh -t xxx.xxx.xxx.xxx "cd /directory_wanted; bash"

How to enter ssh password using bash?

Create a new keypair: (go with the defaults)
ssh-keygen

Copy the public key to the server: (password for the last time)
ssh-copy-id user@my.server.com

From now on the server should recognize your key and not ask you for the password anymore:
ssh user@my.server.com

设置ngrok域名

ssh: connect to host localhost port 22: Connection refused

错误原因：
1.sshd 未安装
2.sshd 未启动
3.防火墙
解决方法：
1.确定安装sshd:
$ sudo apt-get install openssh-server
2.启动sshd:
$ sudo net start sshd
3.检查防火墙设置,关闭防火墙：
$ sudo ufw disable
检验方法，输入命令：
$ ssh localhost
若成功，则表示安装成功，且连接通过；
但是有的时候虽然成功了但是还是会出现Connection refused 问题。
运行 ps -e | grep ssh，查看是否有sshd进程：
有时候虽然可以看到sshd 但是还是不能连接成功
这时候就要想到重新启动一下：sudo service ssh restart