由于termux上不能输入密码登录，所以我们只能使用生成密钥对的方式实现远程连接。
Linux上生成公匙导入termux
实验环境：Linux IP：192.168.2.206
temux IP：192.168.2.196
注意：Linux系统和termux必须在同一个局域网中，不然私钥无法上传。
1.首先在termux上安装openssh服务
$ apt install openssh -y
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
krb5 ldns libdb libedit termux-auth
The following NEW packages will be installed:
krb5 ldns libdb libedit openssh termux-auth
0 upgraded, 6 newly installed, 0 to remove and 2 not upgraded.
Need to get 1660 kB of archives.
After this operation, 8405 kB of additional disk space will be used.
Get:1 http://mirrors.tuna.tsinghua.edu.cn/termux stable/main aarch64 lib