Introduction
Chef allows you to automate processes by writing scripts. The chef is employed by a large number of infrastructure companies. Using it, infrastructure can be converted into code, providing an effective automation platform. In order to automate infrastructure, Chef is used, which is a powerful platform for converting infrastructure into code.

But what does infrastructure as code actually mean? Let's say you need to install a Java program on a single machine. It is not necessary to automate the task; you can complete it manually.
But what happens when you need to deploy your application on 10, 50, or 100 additional machines? This is so because one machine is unable to handle the load. The chef can help with this. You can create code that deploys your application automatically rather than having to do it by hand on each and every computer.
Let us dig deeper into chef-run (executable).
chef-run (executable)
Utilizing the Chef Infra Client, ad hoc tasks can be carried out on one or more target nodes by using the tool chef-run. Start by running a chef-run -h to become acquainted with the arguments and flags.
Chef-run targets a single machine and runs a single resource on it in its most basic form:
chef-run ssh://my_user@host1:2222 directory /tmp/foo --identity-file ~/.ssh/id_rsa
To apply a Resource to a Single Node over SSH
In its most basic form, chef-run targets a single computer and runs just one resource on it:
chef-run ssh://my_user@host1:2222 directory /tmp/foo --identity-file ~/.ssh/id_rsa
The default protocol used here is SSH. Chef-run tries to read defaults from your /.ssh/config file while using SSH. Using the aforementioned SSH configuration:
Host host1
IdentityFile /Users/me/.ssh/id_rsa
User my_user
Port 2222
The chef-run command may be defined as:
chef-run host1 directory /tmp/foo
To apply a Resource to a Single Node over WinRM
You must include the winrm protocol in the connection metadata if you want to target WinRM:
chef-run 'winrm://my_user:my_p4ssword!@host' directory /tmp/foo
Only password authentication is supported for WinRM connections. Use the —user and —password parameters to provide the username and password, or enter them like in the example. By including the —SSL flag, HTTPS connections are supported. cooking run over WinRM does not support target host authentication using certificates.







