Linux配置SSH免密登录
免密登录原理

配置过程
[jtl@hadoop104 ~]$ pwd /home/jtl [jtl@hadoop102 ~]$ [jtl@hadoop104 ~]$ ll -al 如果没有==.shh文件夹==可以用ssh 本机名命令后得到
[jtl@hadoop104.ssh]$ ssh-keygen -t rsa id_rsa
[jtl@hadoop104 .ssh]$ cat id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEArWNvRvM9G0qTXeljJLArXGa0BM/dcXqeg2a kwVfG3NFBrmW bsj2lNfcK2E3/iz YgJI2xHbxNL6fUl3YRN z6jdU816s10u7VWYdlkMfVn ni8K 9D wn1KxaQtwTMmRFSaigBq8OnXdi78b6zEsg7isw2a9kEf8x5JvEusbEqlFmiZh N7erbshwuOUd49t3t 3KTXR9kPP8GgON8XeuFRsBCByrSNozuUiOITC/xkcgSp57 U9 uji2KvI8VagxltUbSOgUy5N12KlLk570gC59ap96AnXO2NKfJPGPZwfccFFKG sVP0o6zfOuXwQRH4D79no uo7TZg1frPqTK6PwIDAQABAoIBABIvAGeHcNwg2Q2b QUuCsjlxh WNSyLwghkzuD7A7HV7hDytT p0Zu 7J5rhCjc8zrzGko9u8wZUPfLP tpZWrhDnG7cDMKAI4LgBJwkaU6X9vycltddhqos65 IlUfSrmuyF7brTkvPqkn5q X2ot8QYrYurnJnAwLIFdiQqJ33/4VkHHqR4rV1EczobUWaKlACc36X QwYPyh2gT QLYG34FXMLgALLtSFLpxnHhFvJfeTnVnfEocC2fo4ghz/V5cYPeIF0yj3zQ0QHDy EeV7TZd4KrdqKWM9SEJ7Lfd/nb/WxHOSo4pbSVw2R9pnfEMkzA56acV9fcT Dx v bLX5CMkCgYEA4 DVnQBpyoYAsvhAxa1L4sFf4kehKWpCC9R2f0Mdw 57GdX1uqQO 5rhpEcwp0tq8F0C5M3Rpk37jkG5uQmV89l1cAEkBbhzIRlP3dyEPn63IjKTe/uYK wQKe/BqwkcFayk yb yzyk21oL9NKDANGvx6PXjMC0VeWecsGdR9QdMCgYEAwskm DDigxdBN4b8xpKUDKt/65vZIsQ6FHfOVJeAqjbuM3hm4z10QIb1n2dOydC3r3agM oA1WY5502fZMaP/NU9u7oll8mroGClv7JpN HsmRJUKe7pzA17RYkW 2I9sL06Lp zANbOzo64e9sSJVIFlnpHhqc vEdkDLDX1P99mUCgYAEHeu CmPe5Mzebt28tITK c/PngqPGu8S1sgDyC6ReBdDzhooJ9SzPvkUnrSiURp9fTCwMYe4GXCSAV35mdK7t RIKE/syn0J1Np/awkEhX ivFXrUopb9L/WAh7dmCyJt7TDVNEFmvLfg6Dzq1nyid dDJBKg2FppstxJ9nWA9rQQKBgAQYeqZTIn5GTPzsKj0OAy0JnJrynsCqT347uu0a 84obYXDiFZK2oDo1Y1OfMedjd8wnVmyfGyvpDwfuN9kVV9nliuJ1Azu1oZ7iJDvB ait3jYe9CN53iU5/ykT0ll3Woz8F8 iIQYjTRp2tjRdRnDxsE4zAfoCARWDc0GLW v0ZJAoGAOvtT/p0W5Nh6mslHqfzoBWf/pB/NAbp033QGn7K8sJyG31BI3p4p3 fO tNbmG2PpY0Td3GZ x7gxj4jqh2z8yUjeDQIeq/ 92v qvSuIr7WX/UhbQKKbcE2H 0NTWfQqNUMItghkOq2 D5bTuaWpZTideKJxFHti83GDCahTZ7s0= -----END RSA PRIVATE KEY----- id_rsa.pub
[jtl@hadoop104 .ssh]$ cat id_rsa.pub ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCtY29G8z0bSpNd6WMksCtcZrQEz91xep6DZr6TBV8bc0UGuZZuyPaU19wrYTf LP5iAkjbEdvE0vp9SXdhE37PqN1TzXqzXS7tVZh2WQx9Wf6eLwr0P7CfUrFpC3BMyZEVJqKAGrw6dd2LvxvrMSyDuKzDZr2QR/zHkm8S6xsSqUWaJmE3t6tuyHC45R3j23e37cpNdH2Q8/waA43xd64VGwEIHKtI2jO5SI4hML/GRyBKnntT366OLYq8jxVqDGW1RtI6BTLk3XYqUuTnvSALn1qn3oCdc7Y0p8k8Y9nB9xwUUoaxU/SjrN865fBBEfgPv2ej66jtNmDV s pMro/ jtl@hadoop104 [jtl@hadoop104 .ssh]$ ssh-copy-id hadoop102