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SSH ​

A guide to configuring SSH connections and key management.

Basic Commands ​

Connection ​

shell
# Standard connection
ssh <USERNAME>@<IP_VPS>

# With SSH key
ssh -i ~/.ssh/<KEY_NAME>.pub <USERNAME>@<IP_VPS>

Using an Alias ​

Create an alias in the SSH config file ~/.ssh/config:

shell
# ~/.ssh/config
Host <ALIAS_NAME>
    Hostname <IP_VPS>
    User <USERNAME>
    IdentityFile ~/.ssh/<KEY_NAME>
    IdentitiesOnly yes
shell
# Connect using an alias
ssh <ALIAS_NAME>

Setup ​

The ssh-copy-id command configures SSH access on the server:

  1. Copies the public key to the remote server
  2. Sets appropriate permissions automatically
  3. Appends the key to the authorized_keys file
shell
ssh-copy-id -i ~/.ssh/<key_name>.pub <username>@<ip_vps>

Copy Files ​

shell
# Copy a file over SSH
scp -r <FILE_NAME> <username>@<ip_vps>:~/

# Copy a file over SSH on a custom port
scp -r -P <PORT> <FILE_NAME> <username>@<ip_vps>:~/

Remove a Host Key ​

shell
ssh-keygen -R <IP_VPS>

Connect to a Server ​

1. Generate an SSH Key ​

shell
ssh-keygen -t rsa -b 4096 -C "email@example.com" -f ~/.ssh/<key_name>

2. Copy the Public Key ​

shell
# macOS
pbcopy < ~/.ssh/<key_name>.pub

3. Connect to the VPS ​

shell
ssh -i ~/.ssh/<key_name> root@<ip_vps>

Key Management ​

Authorize the key by appending it to the authorized_keys file:

shell
echo "<public_key>" >> ~/.ssh/authorized_keys