Centos6 password-free login between servers

I received a request today to activate six servers for password-free login between servers.

Unified configuration of all servers: 1-3

1. Modify the hosts file and write the hostname and IP address of all servers to/etc/hosts.
10.1.1.1 ip-10-1-1-1
10.1.1.2 ip-10-1-1-2

2. Modify/etc/ssh/sshd_conf
#> VI/etc/ssh/sshd_config
??????? Find the following content and remove the annotator "#"
Rsaauthentication Yes
Pubkeyauthentication Yes
Authorizedkeysfile? ? ?. SSH/authorized_keys
?????? Restart the SSH service
? #> Service sshd restart

3. Disable SELinux and change SELinux = to disabled #> CAT/etc/SELinux/config

SELinux = disabled
Selinuxtype = targeted

Key File Processing: A (10.1.1.1) password-free logon B (10.1.1.2)
The following operations must be performed under the user who wants to log on without password.
1. Operate on server:
Generate the key file and distribute the concurrent Public Key to the logged-on server:
$> Ssh-keygen-T RSA
Press enter all the way without entering anything
Two key files are generated.
$> LL/home/dmadmin/. Ssh/
Authorized_keys ----------- the key file that the SSH service will find. The archive file is the lock file,
Id_rsa ----------- this is the private key file, which is required by server.
Id_rsa.pub ----------- this is a public key file (LOCK) and needs to be written to authorized_keys of server B.
$> CAT ~ /. Ssh/id_rsa.pub>/home/dmadmin/. Ssh/authorized_keys
$> Chmod 400/home/dmadmin/. Ssh/authorized_keys
$> Ssh-copy-ID-I. Ssh/id_rsa.pub [email protected] transfers the lock file to the logged-on server.

2. Operate on server B
Log on to the server to be logged on and modify the key file permissions.
$> Chmod 400/home/dmadmin/. Ssh/authorized_keys

3. Go back to server a to Test password-free Logon: you can connect to the computer name or IP address.
A ~ $> SSH 10.1.1.2
A ~ $> SSH ip-10-1-1-2
No Password is required. server a can directly log on to server B.

--------------------------------------------------------------------- Server B password-free login to server a 1. at that time, server a had put the public key file in ITS/home/dmadmin /. in the ssh/authorized_keys file, you only need to copy the lock to the local/home/dmadmin /. SSH/directory. 2. Copy the key to server B/home/dmadmin/. Ssh/use the SCP command on server a to copy the private key file to server B. A ~ $> SCP/home/dmadmin /. SSH/id_rsa [email protected]:/tmp/on server B, use the MV command to copy the file to/home/dmadmin /. SSH/B ~ $> MV/tmp/ia_rsa/home/dmadmin/. Ssh/3. Server B password-free logon to server A: you can connect to the computer name or IP address B ~ $> SSH 10.1.1.1 B ~ $> SSH ip-10-1-1-1

Centos6 password-free login between servers