Linux Configuration remote SSH password-free login _linux

This example for you to share the Jalinux configuration remote SSH password-free login method for your reference, the specific contents are as follows

System: CentOS 6.8
Host 1:192.168.0.177
Host 2:192.168.0.178
Tools Introduction:
Ssh-keygen: Creating Public keys and keys
Ssh-copy-id: Copies the generated public key to the Authorized_keys file on the 192.168.0.178 host.
Ssh-copy-id also sets the appropriate permissions for the remote host's user home directory (/home) and/root/.ssh and/root/.ssh/authorized_key

1 Create the public key and key

[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 PA Ssphrase again:
Your identification has been saved.
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 ~]#

2) Copy public key to remote host

[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.< C5/>rsa key fingerprint is 53:bd:d7:e6:27:96:f3:70:f1:4b:4d:35:a4:38:1d:69.
Are you sure your 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 to the machine, with SSH ' root@192.168.0.178 ', and check in:
. Ssh/authorized_keys to make
sure we haven ' t added extra keys this you weren ' t expecting.
[Root@test ~]#

3) test Remote connection

[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 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 The scope link Valid_lft forever preferred_lft forever [Root@test ~]# [root@test ~]# ssh 192.168.0.178 last Login:sat Sep 14:00:49 2016 from 192.168.0.103 [root@test ~] #ip addr 1:lo: <LOOPBACK,UP,LOWER_UP> MTU 65536 QDISC noqueue Stat E UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet Scope host lo 127.0.0.1/8:: Inet6 Scope Host VA Lid_lft Forever Preferred_lft Forever 2:eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> MTU 1500 Qdisc 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
 306/64 scope link Valid_lft forever Preferred_lft forever

View the 192.168.0.177 generated Authorized_keys

[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

To this trust add is done, 192.168.0.177 can telnet to the 192.168.0.178 server without password, if you want to achieve two-way trust, please 192.168.0.178
Repeat the above steps, write the purpose of this article just want to record the things, in case of forgetting to check!

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