linux-scp命令及如何设置免密登录

部署测试环境时经常在两台服务器间copy文件，那么如何设置免密登录？

场景：源服务器A（如172） -> 目标服务器B（如71）  实现将服务器A的文件copy到服务器B

实现方式有两种：

在源服务器A（172）上执行：若两台服务期间已设置免密登录（绿色字体是设置免密登录），那么只需要执行下述红色命令

首先运行命令 ssh-keygen  根据提示一路回车即可
[yyuser@hlyy .ssh]$ ssh-copy-id chenjl@10.1.1.71
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/yyuser/.ssh/id_rsa.pub"
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
chenjl@10.1.1.71's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'chenjl@10.1.1.71'"
and check to make sure that only the key(s) you wanted were added.

[yyuser@hlyy home]$ ll
total 4
-rw-r--r--  1 root   root      0 Sep  2 23:59 a.txt
drwx------ 10 yyuser yyuser 4096 Sep  2 17:22 yyuser
[yyuser@hlyy home]$ scp -r a.txt chenjl@10.1.1.71:/home/py
a.txt                                                                                                                                 100%    0     0.0KB/s   00:00  

在目标服务器B（71）上执行：若两台服务期间已设置免密登录（绿色字体是设置免密登录），那么只需要执行下述红色命令

首先执行命令ssh-keygen 根据提示一路回车即可
[chenjl@ipha-dev71-1 .ssh]$ ssh-copy-id yyuser@10.1.1.172      #将公钥添加到172
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/chenjl/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
yyuser@10.1.1.172's password: 
/home/yyuser/osinfo.sh: line 17: lspci: command not found

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'yyuser@10.1.1.172'"
and check to make sure that only the key(s) you wanted were added.

[chenjl@ipha-dev71-1 .ssh]$ scp yyuser@10.1.1.172:/home/a.txt /home/py
/home/yyuser/osinfo.sh: line 17: lspci: command not found
a.txt