Generate key under 1.Linux
Ssh-keygen's command manual, through the "Man Ssh-keygen" command:
by command "ssh-keygen-t RSA"
A ". SSH" folder will be generated at the user's root directory after the build
Entering ". SSH" will generate the following files
Authorized_keys: The public key that stores the remote password-free login, which records the public key of multiple machines mainly through this file.
ID_RSA: Generated private key file
Id_rsa.pub: Generated Public key file
Know_hosts: List of known host public keys
If you want the SSH public key to take effect, at least two of the following conditions will be met:
1). The SSH directory must have permissions of 700
2). The. ssh/authorized_keys file permission must be 600
2. Remote password-free login
Schematic diagram:
The following methods are commonly used:
2.1 By way of Ssh-copy-id
Command: Ssh-copy-id-i ~/.ssh/id_rsa.put <romte_ip>
Example:
?
1234567891011 |
[[email protected]
test .
ssh
]
# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.91.135
[email protected]‘s password:
Now try logging into the machine, with
"ssh ‘192.168.91.135‘"
, and check
in
:
.
ssh
/authorized_keys
to
make sure we haven
‘t added extra keys that you weren‘
t expecting.
[[email protected]
test .
ssh
]
# ssh [email protected]
Last login: Mon Oct 10 01:25:49 2016 from 192.168.91.133
[[email protected] ~]
#
|
Common errors:
[Email protected] ~]# ssh-copy-id-i ~/.ssh/id_rsa.pub 192.168.91.135
-bash:ssh-copy-id:command not found//prompt command does not exist
Workaround: Yum-y Install openssh-clients
2.2 Writing content to each other's files via SCP
Command: scp-p ~/.ssh/id_rsa.pub [Email Protected]<remote_ip>:/root/.ssh/authorized_keys
Example:
?
123456789 |
[[email protected]
test .
ssh
]
# scp -p ~/.ssh/id_rsa.pub [email protected]:/root/.ssh/authorized_keys
[email protected]‘s password:
id_rsa.pub 100% 408 0.4KB
/s 00:00
[[email protected]
test .
ssh
]
#
[[email protected]
test .
ssh
]
#
[[email protected]
test .
ssh
]
#
[[email protected]
test .
ssh
]
# ssh [email protected]
Last login: Mon Oct 10 01:27:02 2016 from 192.168.91.133
[[email protected] ~]
#
|
It can also be divided into two steps:
$ SCP ~/.ssh/id_rsa.pub [email protected]<remote_ip>:p ub_key//Copy files to a remote server
$ cat ~/pub_key >>~/.ssh/authorized_keys//Append the content to the Authorized_keys file, but log on to the remote server to execute the command
2.3 Bulk-free through ansible
2.3.1 will need to do a secret-free operation of the machine hosts to add to the/etc/ansible/hosts:
[Avoid Close]
192.168.91.132
192.168.91.133
192.168.91.134
2.3.2 Execution of commands for free-secret operation
Ansible <groupname>-M authorized_key-a "User=root key= ' {{lookup (' file ', '/root/.ssh/id_rsa.pub ')}} '"-K
Example:
?
1234567891011121314 |
[[email protected]
test sshpass-1.05]
# ansible test -m authorized_key -a "user=root key=‘{{ lookup(‘file‘,‘/root/.ssh/id_rsa.pub‘) }}‘" -k
SSH password: ----->输入密码
192.168.91.135 | success >> {
"changed"
:
true
,
"key"
:
"ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArZI4kxlYuw7j1nt5ueIpTPWfGBJoZ8Mb02OJHR8yGW7A3izwT3/uhkK7RkaGavBbAlprp5bxp3i0TyNxa/apBQG5NiqhYO8YCuiGYGsQAGwZCBlNLF3gq1/18B6FV5moE/8yTbFA4dBQahdtVP PejLlSAbb5ZoGK8AtLlcRq49IENoXB99tnFVn3gMM0aX24ido1ZF9RfRWzfYF7bVsLsrIiMPmVNe5KaGL9kZ0svzoZ708yjWQQCEYWp0m+sODbtGPC34HMGAHjFlsC/SJffLuT/ug/hhCJUYeExHIkJF8OyvfC6DeF7ArI6zdKER7D8M0SM WQmpKUltj2nltuv3w== [email protected]"
,
"key_options"
: null,
"keyfile"
:
"/root/.ssh/authorized_keys"
,
"manage_dir"
:
true
,
"path"
: null,
"state"
:
"present"
,
"unique"
:
false
,
"user"
:
"root"
}
[[email protected]
test sshpass-1.05]
#
|
2.4 How to manually copy and paste
Copy the contents of the local id_rsa.pub file to the remote server's ~/.ssh/authorized_keys file
The above is a small part of the introduction of the Linux implementation of password-free login, I hope that we have some help, if you have any questions please give me a message, small series will promptly reply to you. Thank you very much for the support of the Scripting House website!
Original link: http://www.cnblogs.com/LuisYang/archive/2016/10/12/5952871.html
Password-free login under Linux (Super verbose)