Exams of Cloud
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When to use immutable infrastructure – Immutable Infrastructure with Packer
Deciding to switch to immutable infrastructure is difficult, especially when your Ops team treats servers as pets. Most people get paranoid about the idea of deleting an existing server and…
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Immutable infrastructure with HashiCorp’s Packer – Immutable Infrastructure with Packer-2
With the scalable infrastructure that the cloud provides, you can have a dynamic horizontal scaling model where VMs scale with traffic. Therefore, you can have the best possible utilization of…
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Immutable infrastructure with HashiCorp’s Packer – Immutable Infrastructure with Packer-1
Imagine you are the author of a book and you need to make changes to an existing edition. When you want to make changes, such as improving the content or…
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Registering variables – Infrastructure as Code (IaC) with Terraform-3
The common directory contains a single directory called tasks that includes a main.yaml file with a single task to run an apt update operation. The main directory contains ansible.cfg, hosts,…
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Registering variables – Infrastructure as Code (IaC) with Terraform-2
Tip While choosing between the vars and defaults directories, the rule of thumb is to put variables that will not change within the vars directory. Put variables that are likely…
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Registering variables – Infrastructure as Code (IaC) with Terraform
If a task within your playbook, for example, needs a value from the result of a preceding task, we can use the register attribute. The following directory contains all the…
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Dictionary variables – Infrastructure as Code (IaC) with Terraform
Dictionary variables hold a complex combination of key-value pairs, the same as a Python dictionary. You can define dictionary variables using the standard YAML syntax, as in the following example:foo:bar:…
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Designing for reusability – Infrastructure as Code (IaC) with Terraform
Ansible provides variables for turning Ansible playbooks into reusable templates. You can substitute variables in the right places using Jinja2 markup, which we’ve already used in the last playbook. Let’s…
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Combining playbooks – Infrastructure as Code (IaC) with Terraform
As we’ve written multiple playbooks, we need to execute them in order. We cannot configure the services before installing packages and services, and there is no point in running an…
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Installing application packages and services – Infrastructure as Code (IaC) with Terraform
We will use the apt module to install the packages on Ubuntu, and the service module to start and enable the service. Let’s start by installing Apache on the web…
