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SSH cz.2 – Fast connection to the server, change .ssh/config

SSH – network connection - Szybkie łączenie z serwerem, zmiana sshconfig 2022

If we connect to the server in the console and use the ‘ssh USER @ HOSTNAME‘ command. We may be prompted for a password in this case, or not if we use the ssh key. I have described how to configure and use SSH keys so that we do not have to enter a password in another article. Today I wanted to introduce a way how you can simplify the whole thing even more by changing the .ssh/config file and using aliases.

If we use non-standard ports or keys from non-standard places in the connection, the entire command is slightly longer:

ssh -p 2202 USER@HOSTNAME
ssh -i /path/key.pem USER@HOSTNAME

Additionally, we need to remember all this information with each non-standard connection. Imagine we now have 100 such servers with a custom configuration. It would be a bit difficult to remember. Of course, we should save everything in some password manager, but we can also help ourselves in other ways.

By editing or adding the ~/.ssh /config file, we can enter aliases for each connection, along with the login method and custom options.

# open the file for editing, use vi, nano or whatever you like
$ vim ~/.ssh/config
Host alias1

Host alias2
    Port 2202
    IdentityFile  ~/.ssh/id_example1
    IdentitiesOnly yes

Host alias3
    PubkeyAuthentication no
  • HostName – you enter the name or IP address of the server you want to connect to
  • User – username you are going to connect to
  • Port – you enter if you connect on a non-standard port
  • IdentityFile – if you connect using a key then here you specify a non-standard key location
  • IdentitiesOnly – force only key bindings to be used
  • PubkeyAuthentication – whether to try to connect using ssh keys

For standard ports or places, the parameters can be omitted. You can find more parameters that you can use at

Now to connect instead of using the command:

ssh -p 2202 -i /.ssh/id_example1 [email protected]

Just use the command:

ssh alias2
ssh linux connection - use .ssh/config

If you want to know how to use ssh keys, check out this article.