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1 SSH

SSH (Secure Shell) enables secure remote connections between systems by encrypting data transmission. System admins use SSH utilities to manage machines remotely by copying or moving files between systems securely. The document provides instructions on how to access remote servers over SSH, including specifying usernames, alternative port numbers, generating SSH keys for authentication, copying public keys and files remotely with SCP, and editing and restarting the SSH service configuration.

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sanjaay R
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115 views4 pages

1 SSH

SSH (Secure Shell) enables secure remote connections between systems by encrypting data transmission. System admins use SSH utilities to manage machines remotely by copying or moving files between systems securely. The document provides instructions on how to access remote servers over SSH, including specifying usernames, alternative port numbers, generating SSH keys for authentication, copying public keys and files remotely with SCP, and editing and restarting the SSH service configuration.

Uploaded by

sanjaay R
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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BY :- shinchan

Introduction
➢ SSH (Secure Shell) is a network protocol that enables secure remote connections
between two systems.
➢ System admins use SSH utilities to manage machines, copy, or move files
between systems
➢ SSH transmits data over encrypted channels, security is at a high level

How to Access a Remote Server


➢ To connect to a remote machine, you need its IP address or name.

IP address:

name:

➢ The first time you connect to a host, you’ll see this message:

➢ Type yes and hit enter. You may need to enter your password as well.

Specify a Username for SSH connection


➢ SSH uses the current user when accessing a remote server.

sh username@10.0.0.55
Use a Different Port Number for SSH Connection
➢ By default, the SSH server listens for a connection on port 22.
➢ If the port setting in the SSH config file has been changed, you’ll need to specify
the port

Otherwise, you will get this error:

➢ To connect to a remote host with a custom SSH port number, use the -p flag.

ssh username@hostname_or_ip -p 3322

Generate SSH Keys Using SSH Keygen


➢ To improve the security of SSH connections, generate a key pair with the keygen
utility.
➢ The public key can be shared, while the private key needs to stay secure.

➢ SSH key pairs are used to authenticate clients to servers automatically.

ssh-keygen -t rsa

➢ To use default settings, hit Enter on the prompts for file location and passphrase.

Copy Public SSH Key


➢ To use the key pair for SSH authentication, you’ll need to copy the public key
to a server.
➢ he key is the file id_rsa.pub previously created with SSH keygen utility.

ssh-copy-id username@hostname_or_ip

Copy a File Remotely over SSH with SCP


➢ You can securely copy files over the SSH protocol using the SCP tool.

scp filename username@hostname_or_ip:/home/test


➢ Make sure to use the uppercase -P flag if you need to specify the port.

Edit SSH Config File


➢ Edit the settings in the sshd_config file to customize SSH server options.

sudo nano /etc/ssh/sshd_config


➢ Use the editor of your choice to edit the file. You’ll need superuser permissions
to make changes. In Linux, we use nano:
Enter the sudo password, and the shell opens the file in the editor you used.

Restart SSH service


➢ When you make changes to the SSH configuration, you’ll need to restart the
service in Linux.
➢ Depending on the Linux distro, run one of the commands on the machine where
you modified the settings:

sudo ssh service restart

sudo sshd service restart

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