Continuation of the previous lab(3rd)

1. Executing Linux Commands in Chef

Chef allows you to execute Linux commands inside recipes using the execute resource. This is useful for tasks like creating directories, files, or running shell commands.

Steps to Execute Linux Commands:

1. Login to Amazon Linux Machine:

   sudo su
   cd cookbooks
   ls
   

   • Output Example: apache-cookbook test-cookbook

2. Create a Recipe to Run Linux Commands:

   vi test-cookbook/recipes/test-recipe.rb
   

   • Add the following code:

     execute "run a script" do
       command <<-EOH
         mkdir /Zeeshandir
         touch /Ahmadfile
       EOH
     end
     

   • Explanation:

     • The execute resource runs shell commands.
     • EOH (End of Here Document) allows writing multiple shell commands.

3. Run the Recipe:

   chef-client -zr "recipe[test-cookbook::test-recipe]"
   

4. Verify the Changes:

   ls /
   

2. Creating Users & Groups in Chef

Chef allows creating system users and groups using the user and group resources.

Creating a User:

1. Edit the Recipe:

   vi test-cookbook/recipes/test-recipe.rb
   

   • Add the following code:

     #The below code will create a new user
     
     user "rockstar" do
       action :create
     end
     

2. Run the Recipe:

   chef-client -zr "recipe[test-cookbook::test-recipe]"
   

Creating a Group & Adding a User:

1. Edit the Recipe:

   vi test-cookbook/recipes/test-recipe.rb
   

   • Add the following code:

     # The following code will create a group and add a member to it
     
     group "Devops group" do
       action :create
       members 'shan'
       append true
     end
     

2. Run the Recipe:

   chef-client -zr "recipe[test-cookbook::test-recipe]"
   

3. Verify the Group Creation:

   cat /etc/group