packer: add content and hands on

README.md

@@ -219,14 +219,14 @@ We cover a wide range of DevOps topics in our content library, explore them unde
         <td>Nginx</td>
         <td><a href="./topics/nginx/">nginx</a></td>
         <td>📖 <a href="https://nginx.org/en/docs/">nginx.org/en/docs</a></td>
-        <td>✔️ <a href="./topics/nginx/basic/">nginx basic</a></td>
+        <td>✔️ <a href="./topics/nginx/basic/">Nginx basic</a></td>
     </tr>
     <tr>
         <td><img width="32" src="https://www.datocms-assets.com/58478/1638283616-packer.svg"></td>
         <td>Packer</td>
-        <td>coming-soon</td>
+        <td><a href="./topics/packer/">packer</a></td>
         <td>📖 <a href="https://www.packer.io/">www.packer.io</a></td>
-        <td>⏩ coming-soon</td>
+        <td>✔️ <a href="./topics/packer/basic/">Packer basic</a></td>
     </tr>
     <tr>
         <td><img width="32" src="https://www.hashicorp.com/_next/static/media/vault_on-dark.97792f64.svg"></td>

topics/packer/README.md

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+## 1. What is Packer?
+
+### Overview
+
+- Packer is a tool that lets you create identical machine images for multiple platforms from a single source template.
+- Packer can create golden images to use in image pipelines.
+
+### Official website documentation of Packer
+
+- https://www.packer.io/
+
+## 2. Prerequisites
+
+- None
+
+## 3. Installation
+
+### How to install Packer?
+
+- https://developer.hashicorp.com/packer/install
+
+## 4. Basics of Packer
+
+### Packer getting started
+
+- Begginner's Guide: https://developer.hashicorp.com/packer/tutorials
+
+### Packer Hands on
+
+- See: [basic](./basic/)
+
+## 5. More...
+
+### Packer cheatsheet
+
+- None
+
+### Recommended Books
+
+- None

topics/packer/basic/README.md

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+# Build an Ubuntu machine image on AWS with Packer
+
+## Prerequisites
+
+- AWS account
+- Packer installed
+- Authenticate to AWS
+  ```bash
+  export AWS_ACCESS_KEY_ID="<YOUR_AWS_ACCESS_KEY_ID>"
+  export AWS_SECRET_ACCESS_KEY="<YOUR_AWS_SECRET_ACCESS_KEY>"
+  ```
+- Doc: https://developer.hashicorp.com/packer/integrations/hashicorp/amazon#iam-task-or-instance-role
+
+## Init
+
+```bash
+packer init .
+```
+
+## Build
+
+```bash
+packer build aws-ubuntu.pkr.hcl
+
+# ...
+# ==> Wait completed after 5 minutes 15 seconds
+# ==> Builds finished. The artifacts of successful builds are:
+# --> learn-packer.amazon-ebs.ubuntu: AMIs were created:
+# us-west-2: ami-xxxxyyyyzzzztttt
+```
+
+## Verify
+
+- Go to AWS Console `us-west-2` (The region we build packer AMI): https://us-west-2.console.aws.amazon.com/ec2/home?region=us-west-2#Images:visibility=owned-by-me
+- You now can see your AMI with name: `learn-packer-linux-aws-redis-<timestamp>`
+  ![](./assets/ami-on-aws.png)
+
+## Cleanup
+
+- Once you dont want to use the AMI anymore, follow https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/deregister-ami.html to delete it.

topics/packer/basic/aws-ubuntu.pkr.hcl

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+packer {
+  required_plugins {
+    amazon = {
+      version = ">= 1.2.8"
+      source  = "github.com/hashicorp/amazon"
+    }
+  }
+}
+
+source "amazon-ebs" "ubuntu" {
+  ami_name      = "${var.ami_prefix}-${local.timestamp}"
+  instance_type = "t2.micro"
+  region        = "us-west-2"
+  source_ami_filter {
+    filters = {
+      name                = "ubuntu/images/*ubuntu-jammy-22.04-amd64-server-*"
+      root-device-type    = "ebs"
+      virtualization-type = "hvm"
+    }
+    most_recent = true
+    owners      = ["099720109477"]
+  }
+  ssh_username = "ubuntu"
+}
+
+build {
+  name = "learn-packer"
+  sources = [
+    "source.amazon-ebs.ubuntu"
+  ]
+
+  provisioner "shell" {
+    environment_vars = [
+      "FOO=hello world",
+    ]
+    inline = [
+      "echo Installing Redis",
+      "sleep 30",
+      "sudo apt-get update",
+      "sudo apt-get install -y redis-server",
+      "echo \"FOO is $FOO\" > example.txt",
+    ]
+  }
+
+  provisioner "shell" {
+    inline = ["echo This provisioner runs last"]
+  }
+}
+
+variable "ami_prefix" {
+  type    = string
+  default = "learn-packer-linux-aws-redis"
+}
+
+locals {
+  timestamp = regex_replace(timestamp(), "[- TZ:]", "")
+}