Linux配置远程SSH无密码登录

  [root@test ~]# ssh-keygen -t rsa  Generating public/private rsa key pair.  Enter file in which to save the key (/root/.ssh/id_rsa):  Enter passphrase (empty for no passphrase):  Enter same passphrase again:  Your identification has been saved in /root/.ssh/id_rsa.  Your public key has been saved in /root/.ssh/id_rsa.pub.  The key fingerprint is:  79:a9:66:cd:1a:a5:7c:82:80:c3:06:ec:44:13:b9:7a root@test  The key's randomart image is:  +--[ RSA 2048]----+  | +o |  |o.. |  |.o. |  |o+ . . . |  |..= . S + |  |..E. . o B |  | . . O + |  | o = |  | . |  +-----------------+

  [root@test ~]# ls .ssh/  authorized_keys id_rsa id_rsa.pub  [root@test ~]#  [root@test ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.0.178  The authenticity of host '192.168.0.178 (192.168.0.178)' can't be established.  RSA key fingerprint is 53:bd:d7:e6:27:96:f3:70:f1:4b:4d:35:a4:38:1d:69.  Are you sure you want to continue connecting (yes/no)? YES  Warning: Permanently added '192.168.0.178' (RSA) to the list of known hosts.  root@192.168.0.178's password:  Now try logging into the machine, with "ssh 'root@192.168.0.178'", and check in:  .ssh/authorized_keys  to make sure we haven't added extra keys that you weren't expecting.  [root@test ~]#  

  [root@test ~]# ip addr show  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  inet 127.0.0.1/8 scope host lo  inet6 ::1/128 scope host  valid_lft forever preferred_lft forever  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000  link/ether 00:0c:29:7e:1f:f6 brd ff:ff:ff:ff:ff:ff  inet 192.168.0.177/24 brd 192.168.0.255 scope global eth0  inet6 fe80::20c:29ff:fe7e:1ff6/64 scope link  valid_lft forever preferred_lft forever  [root@test ~]#  [root@test ~]# ssh 192.168.0.178  Last login: Sat Sep 24 14:00:49 2016 from 192.168.0.103  [root@test ~]#ip addr  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  inet 127.0.0.1/8 scope host lo  inet6 ::1/128 scope host  valid_lft forever preferred_lft forever  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000  link/ether 00:0c:29:36:93:06 brd ff:ff:ff:ff:ff:ff  inet 192.168.0.178/24 brd 192.168.0.255 scope global eth0  inet6 fe80::20c:29ff:fe36:9306/64 scope link  valid_lft forever preferred_lft forever  

  [root@test .ssh]# cat authorized_keys  ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA+I6LXDE5DvSmQJcX98FpzScXoGpJ6fD47yXzp/tp/HTpOTQgNbiTjH6s6yNMsd5LQlBED8a5CTx5wKm+H7rT0po2xD+AZcF69js+4SwO8/xFwHLZ/8O64hsvn68GmxqO9vP8giWWcZNy/CsmOecllOB1NFXpCwQ1TBw+P4n84oj2YHwdSzGcre8j/OiAChHl6QHFtAuFvOdVRYFeyurFM8KP6Bb6tEeDDrqILboaQtTJOwRD2Fkt33C5lpuZNNGqc+DmRjDabgC3ZgzRCe3OyYbhaRlfiwVHFPYt7pDQMnrp/dUmyBSs/6gwd2CiK3cV4ZvpOzyGdynPqXsxIIBIKw== root@test