ssh

• Create ssh key pair

Bash

ssh-keygen -t ed25519 -C some-name

• Add or migrate existing ssh key

Bash

sudo chmod 400 id_ed25519

Bash

sudo chmod 400 id_ed25519.pub

Bash

eval `ssh-agent -s`

Bash

ssh-add id_ed25519

• SSH tunneling

Let say some machine has access to certain domain or IP and you wanna access it from your machine

Bash

ssh -L local_port:remote_address:remote_port user@domain_or_ip

Access that port using curl or whatever for example curl http:127.0.0.1:local_port

Use tunnel to access mysql:

Bash

ssh -L 3306:mysql-server:3306 username@mysql-server