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