SSH

1. Local create public_key & private_key
2. Only private_key can understand public_key
3. Remote sends message encrypted based on public_key
4. Local has to use private_key to understand (decrypt) remote’s message
5. To easy to manage SSH, you can use Terminus app

# generate rsa key
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

# without email
ssh-keygen -t rsa -b 4096

The default of location SSH Key:

• Windows: C:\Users\namnh198\.ssh
• Linux & MacOS: ~/.ssh => /home/namnh198/.ssh

1. Create a key different names, e.g id_rsa_magento_cloud,…
2. Add to ~/.ssh/config

Host magento_cloud
Hostname *.magento.cloud # match with all subdomain github.com
IdentityFile ~/.ssh/id_rsa_magento_cloud
User <your_username>

3. Add to ssh-keygen (Don’t need to retype password again)

eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_rsa_magento_cloud

Suppose that we wanna connect to a remote host username@remote.com from a local machine

1. On local machine, copy public key at ~/.ssh
2. On remote server, go to ~/.ssh open file authorized_keys and paste contents of your public_key to it

ssh user@hostname.com

# with port != 22
ssh user@hostname.com -p remote_port

# connect with specific private_key
ssh -i your_private_key user@hostname.com

Some arguments:

• i: Identity File
• f: Request ssh to go to background just before command excution
• L: Local port forwarding
• p: Port
• q: Quiet mode
• v: Verbose mode
• X: Running GUI remote app locally
• C: Use data compression

# check version
ssh -v

# disconnect
exit

# copy file local -> remote
scp local_file user@hostname.com:/remote_path

# download file remote -> local
scp user@hostname.com:/remote_file local_path

To read more some SSH command:

man ssh