[Linux] avoid close Login

1. Generate Key

ssh-keygen -t rsa -C "<填写自己方便识别的注释>" -b 4096  No problem on the implementation of the three spaces. 
1. Fill three problem is to generate a key for the path name. 2 Fill custom passphrsa. 3 confirmation. 

 1 [root@localhost home]# ssh-keygen -t rsa -C "********" -b 4096
 2 Generating public/private rsa key pair.
 3 Enter file in which to save the key (/root/.ssh/id_rsa): 
 4 Enter passphrase (empty for no passphrase): 
 5 Enter same passphrase again: 
 6 Your identification has been saved in /root/.ssh/id_rsa.
 7 Your public key has been saved in /root/.ssh/id_rsa.pub.
 8 The key fingerprint is:
 9 SHA256:oQYIN3KUkPmnCn0LrC25h5L0yVpiIvoHUgawDuyCKuE **************
10 The key's randomart image is:
11 +---[RSA 4096]----+
12 |*==.             |
13  | = *. O |
14  | o +. . . |
15  | = + ... . |
16  | + Breakfast oo S |
17  | * o * .. |
18  | BEO = .. |
19  | # = + o |
20  | + * o. |
21 + ---- [SHA256] ----- +

2. The public and private keys generated in the directory /root/.ssh

. 1  [.ssh the root @ localhost] # pwd
 2  /root/.ssh
 . 3  [.ssh the root @ localhost] -l # LS
 . 4  Total amount 12 is
 . 5  -rw -------. The root the root. 1 September 19, 3247 10:00 id_rsa # private key
 . 6  -rw-R & lt -.. 9 r--. 1 the root the root 746 dated 19 10:00 id_rsa.pub # public key
 . 7 -rw-R & lt -. 174. 9 r-- the root the root. 1 May 18 16:58 known_hosts

3. Copy the public key to the remote host /root/.ssh/ id_rsa.pub file and rename it to authorized_keys.

• scp  /root/.ssh/id_rsa.pub   root@远程ip:/root/.ssh/authorized_keys

or

• ssh-copy-id  -i  ~/.ssh/id_rsa.pub root@远程ip

Verify password

4. Connect

• remote ip ssh

5. Free confirm fingerprint machine (without addition of the known_hosts)

• ssh -o StrictHostKeyChecking = no remote ip