Linux 多台机器ssh免密登录

step1:生成公钥和私钥

#20d30
ssh-keygen -t rsa#一路回车,每台主机上依次执行

cat id_rsa.pub >> authorized_keys

step2:生成授权文件

#20d30
cd /root/.ssh
cat id_rsa.pub >> authorized_keys#随便找一台机器上

step3:复制授权文件

#20d30
cd /root/.ssh
scp authorized_keys root@20d31:/root/.ssh/

step4:追加公钥到授权文件

#20d31
cd /root/.ssh
cat id_rsa.pub >> authorized_keys

step5:覆盖授权文件

#20d31
cd /root/.ssh
scp authorized_keys root@20d30:/root/.ssh/