Simplifying SSH connections with a config file

Before we leave the topic of OpenSSH, there’s another trick that has the benefit of convenience, and that is the creation of a local configuration file for SSH. This file must be stored in the .ssh directory of your home directory, and be named config. The full path for this file in my case looks like this:

/home/jay/.ssh/config

This file doesn’t exist by default, but if it’s found, SSH will parse it whenever you use the client and you’ll be able to benefit from it. Go ahead and open this file in your text editor, such as nano:

nano /home/your_username/.ssh/config

This config file allows you to type configuration for servers that you connect to often, which can simplify the ssh command automatically. The following are example contents from such a file that will help me illustrate what it does:

host myserver 
    Hostname 192.168.1.23 
    Port 22 
    User jdoe 
Host nagios 
    Hostname...