Install and Config SSH Connection

1. Install SSH

It is very easy, I strongly recommend you install it on Linux or WSL(Windows Subsystem for Linux), I will record how to install WSL at: How to install WSL . And I will give you my reasons Why Stop Coding on Windows.

Almost all Released Versions of Linux have already installed SSH, but if you find there is no SSH for you computer, just install it from apt.

sudo apt install openssh-server

Check status of ssh:

sudo systemctl status ssh

If you see the result below, SSH is running correctly.

● ssh.service - OpenBSD Secure Shell server
   Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2024-11-12 10:21:34 UTC; 1min 32s ago

you can restart ssh make sure it work.

sudo systemctl restart ssh

2. Config SSH

Note: most cloud providers enable firewall rules by default. If port 22 is closed, SSH will fail; allow inbound SSH first.

There are two methods to verify your identification:

Note: password authentication works, but key-based login is more secure and recommended.

SSH-key:How to set SSH key pair

Note: SSH key login is based on asymmetric cryptography (private key on client, public key on server).

After we generate a SSH key pair, we will find key pair file at:

~/.ssh/id_{encrypt_method}
~/.ssh/id_{encrypt_method}.pub

id_{encrypt_method} is your private key, please remember never leak this file to anyone.

id_{encrypt_method}.pub is your public key, you should upload it to your Cloud Server.

Note: you can upload files with scp or rsync after SSH is configured.

Besides, we can copy the content of id_{encrypt_method}.pub to ~/.ssh/authorized_keys directly, to speak of, this file can contain many public keys, every key just occupies one line.
For example:

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICUcN+UpNbVOI9pHj796/Sd4+iHbAdBOQvSPq example@proton.me
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICUcN+UpNbVOI9pHj796/Sd4+iHbAdBOQvSPq example@proton.me
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICUcN+UpNbVOI9pHj796/Sd4+iHbAdBOQvSPq example@proton.me

3. Connect Remote Server

Note: after key setup, you can connect without password and automate remote commands safely.

Now, let’s test our connection:

ssh user@your-server-ip

Now, we have finished SSH Connection.

If there are any other question, I will add at here.