SSH implementation of remote login server

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4. ssh

4.1 ssh Sign in

Basic usage

Remote login server ：

ssh user@hostname

• user: user name
• hostname: IP Address or domain name

You will be prompted when you log in for the first time ：

The authenticity of host '123.57.47.211 (123.57.47.211)' can't be established.
ECDSA key fingerprint is SHA256:iy237yysfCe013/l+kpDGfEG9xxHxm0dnxnAbJTPpG8.
Are you sure you want to continue connecting (yes/no/[fingerprint])?

Input yes, Then you can return .

This will record the information of the server in ~/.ssh/known_hosts In file .

Then enter the password to log in to the remote server .

The default login port number is 22. If you want to log in to a specific port ：

ssh user@hostname -p 22

The configuration file

create a file ~/.ssh/config.

Then enter in the file ：

Host myserver1
    HostName IP Address or domain name 
    User  user name 

Host myserver2
    HostName IP Address or domain name 
    User  user name 

When using the server later , Alias can be used directly myserver1、myserver2.

Key login

Create key ：

ssh-keygen

Then just go straight back .

After execution ,~/.ssh/ There will be two more files in the directory ：

• id_rsa： Private key
• id_rsa.pub： Public key

Which server do you want to log in without password , Just pass the public key to which server .

for example , Want to log in without secret myserver The server . The contents of the public key , Copied to the myserver Medium ~/.ssh/authorized_keys Just in the file .

You can also use the following command to add a public key with one click ：

ssh-copy-id myserver

Carry out orders

Command format ：

ssh user@hostname command

for example ：

ssh user@hostname ls -a

perhaps

#  In single quotes $i Can be evaluated 
ssh myserver 'for ((i = 0; i < 10; i ++ )) do echo $i; done'

perhaps

#  In double quotation marks $i You can't evaluate 
ssh myserver "for ((i = 0; i < 10; i ++ )) do echo $i; done"

4.2 scp Transfer files

Basic usage

Command format ：

scp source destination

take source Copy the files under the path to destination in

Copy multiple files at once ：

scp source1 source2 destination

Copy folder ：

scp -r ~/tmp myserver:/home/acs/

Put... In the local home directory tmp Copy folder to myserver In the server /home/acs/ Under the table of contents .

scp -r ~/tmp myserver:homework/

Put... In the local home directory tmp Copy folder to myserver In the server ~/homework/ Under the table of contents .

scp -r myserver:homework .

take myserver In the server ~/homework/ Copy the folder to the current local path .

Specify the port number of the server ：

scp -P 22 source1 source2 destination

Be careful ： scp Of -r -P And other parameters shall be added as far as possible source and destination Before .

Use scp Configure other servers vim and tmux

scp ~/.vimrc ~/.tmux.conf myserver: