DevOps Classroom Series – 29/May/2021

Chef cookbook for installing lamp on ubuntu server

  • Manual Steps for installing lamp on ubuntu 18
  • Refer Here for the documentation
  • Summary of manual steps
sudo apt update
sudo apt install apache2 -y
sudo apt install php libapache2-mod-php php-mysql php-cli -y
echo "<?php phpinfo(); ?>" | sudo tee /var/www/html/info.php
chef generate cookbook lampserver -b
  • Now we need to convert each of the above mentioned manual step into a resource in a recipe file

  • We already have a recipe file in recipes folder called as default.rb

  • Refer Here for the cookbook created in the class and Refer Here for the recipe

  • We have a cookbook ready, to test this cookbook

    • Create a test node and bootstrap it to the chef server (manage.chef.io)
    • Add recipe to run_list on test node and check whether it is working or not
  • When we run the chef-client on the test node we get the following result Preview Preview

  • Problems with the test node creation process

    • Bootstrapping test nodes every time
    • If my cookbook has to work on different flavours on Linux Creating VMs manually and checking the cookbook execution manually will be difficult.
    • Changes in the cook might lead to new versions uploaded to the chef server
  • We need some kind of tool,

    • Which will automatically create the VM and run the recipe in the VM
    • Lets us verify the results
    • Also works with various cloud/virtual environments without need of chef server
    • No Need to change cookbook versions to verify
  • In Chef we have a toolkit called as test-kitchen which can exactly do the above steps

Configuring Test Kitchen to Work with AWS

  • Test Kitchen can be used to automatically test cookbooks on different platforms
  • To work with test kitchen
  • Test kitchen can create infrastructure on different virtual environments & for that it uses a driver Refer Here
  • To set up a test kitchen Refer Here
  • In AWS, we need a user with which test-kitchen can login into AWS account and create ec2 instances for testing. We do this by creating an IAM user
  • On the chef workstation, it is recommended to install aws cli Refer Here
  • Make a note of
    • region
    • availability zone
    • vpc-id
    aws ec2 describe-vpcs --query "Vpcs[0].VpcId"
    
    • subnet-id
    aws ec2 describe-subnets --filters "Name=availability-zone,Values=us-west-2a" --query "Subnets[0].SubnetId"
    
    • security group id
  • Add all of the noted information to kitchen.yaml file
  • Now execute kitchen --help Preview
  • Now execute kitchen converge Preview Preview Preview
  • Refer Here for the kitchen configuration

Windows Terminal

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