Tutorial on how to quickly install and deploy remote connection software SSH under Linux

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SSH is divided into client side and server side.

The server is a daemon, usually a sshd process, that runs in the background and responds to requests from the client. Provides processing of remote requests, which generally includes public key authentication, key exchange, symmetric key encryption, and insecure connections.

The client is usually a ssh process, as well as other processes such as scp, slogin, sftp and so on.

Working mechanism:

1. The client sends a connection request to the remote server

two。 The server checks the requested packet and IP address, and then the key is sent to the SSH client.

3. The client sends the key back to the server and a connection is established.

Let's start with the text:

I. client

1. Install the client (client is not required)

The code is as follows:

# apt-get install ssh

If the installation fails, use the following command to install

The code is as follows:

# apt-get install openssh-client

2. SSH login (client)

The code is as follows:

$ssh 192.168.159.128

$ssh-l weiyg 192.168.159.128

$ssh weiyg@192.168.159.128

II. Server side

1. Install the server

The code is as follows:

# apt-get install openssh-server

two。 Start the server

The code is as follows:

# / etc/init.d/ssh stop # stop

# / etc/init.d/ssh start # launch

# / etc/init.d/ssh restart # restart

3. SSH configuration

Modify the configuration file / etc/ssh/sshd_config and restart the service

The code is as follows:

# / etc/init.d/ssh restart

The default port of ssh is 22. Modify it if necessary.

The code is as follows:

Port 20

The default configuration of ssh allows root to log in, and you can modify the configuration table to prevent it from logging in.

The code is as follows:

PermitRootLogin no

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