Linux command: SSH SCP ssh-keygen-t RSA usage

SSH Remote connection command:

Usage format:ssh ipaddr does not specify the user to log on to the remote host as the user of the current host login system

ssh [email protected] telnet to a host as a user via SSH protocol

usage:ssh [email protected] Telnet to the 192.168.1.100 host via the SSH protocol as root

ssh-l USERNAME ipaddr equivalent to ssh [email protected] login mode

SSH [email protected] ' commond ' to username the user to execute Commond command on the remote host.

SCP Remote replication command:

usage Format: SCP src original file or directory dest target directory same as CP command

-R: Directory is also copied

-A: Hidden files, linked files are copied together

SCP [email protected]:/path/to/somefile/path/to/local from the remote host to the local host to

scp/path/to/local [email protected]:/path/to/somefile from the local host to the remote host

SSH-KEYGEN-T RSA Generate key

The generated key is saved in the following path

Private key key saved to: ~/.ssh/id_rsa Current Build user's home directory

Public key saved to: ~/.ssh/id_rsa.pub

-f/path/to/key_file specifying password save path and file name

-P ' password ': Specifies the password for the encrypted private key

The public key is appended to the remote host in the ~/.ssh/authorized_keys file or ~/.ssh/authorized_keys2 file in the user's home directory, and is generally appended to the Authorized_keys file.

Ssh-copy-id: Transfer the public key to the remote server ~/.ssh/id_rsa.pub public key save location

Ssh-copy-id This command is not supported by all Linux versions

-I ~/.ssh/id_rsa.pub [email protected]

Usage:ssh-copy-id-i ~/.ssh/id_rsa.pub [email protected]

Example: How to realize Telnet to the host via SSH does not need to enter password authentication

Method One: Append the generated public key to the home directory corresponding to the remote server

~/.ssh/authorized_keys file.

[[email protected] ~]# ssh-keygen-t RSA generate key

Generating public/private RSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_RSA):

/root/.ssh/id_rsa already exists.

Overwrite (y/n)? Y

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification have been saved in /root/.ssh/id_rsa. Private key Path

Your public key had been saved in /root/.ssh/id_rsa.pub. Public Key Path

The key fingerprint is:

c6:30:84:08:94:ff:91:58:82:56:25:d4:4b:53:98:e3 [email protected]

[Email protected] ~]# Ls/root/.ssh/id_rsa

/root/.ssh/id_rsa

[Email protected] ~]# ls/root/.ssh/id_rsa.pub

/root/.ssh/id_rsa.pub

[Email protected] ~]# scp/root/.ssh/id_rsa.pub [email protected]:/root first copy the locally generated public key to the remote In the home directory of the host

[[email protected] ~]# ssh [email protected] first telnet to the host

[[email protected] ~]# ls

Id_rsa.pub Install.log Install.log.syslog

[[email protected] ~]# mkdir. SSH remote host No. SSH directory requires a new directory, and the directory permission must be 700

[Email protected] ~]# chmod. ssh/Change permission to 700

[[email protected] ~]#cat ~/id_rsa.pub >> ~/.ssh/authorized_keys Append save

[[Email protected] ~] #exit after exiting the remote host after SSH login and can not need to enter a password to login

method Two: Sir into the key, and then through the command directly copied to the remote host

[[email protected] ~]# ssh-keygen-t RSA generate key

Generating public/private RSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_RSA):

/root/.ssh/id_rsa already exists.

Overwrite (y/n)? Y

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification have been saved in /root/.ssh/id_rsa. Private key Path

Your public key had been saved in /root/.ssh/id_rsa.pub. Public Key Path

The key fingerprint is:

c6:30:84:08:94:ff:91:58:82:56:25:d4:4b:53:98:e3 [email protected]

[Email protected] ~]# Ls/root/.ssh/id_rsa

/root/.ssh/id_rsa

[Email protected] ~]# ls/root/.ssh/id_rsa.pub

/root/.ssh/id_rsa.pub

[Email protected] ~]# ssh-copy-id-i/root/.ssh/id_rsd.pub [email protected]

[[email protected] ~]# ssh [email protected] re-login to the remote host via SSH without entering a password

This article is from the "Learn Linux history" blog, please be sure to keep this source http://woyaoxuelinux.blog.51cto.com/5663865/1884297

Linux command: SSH SCP ssh-keygen-t RSA usage