Day 29: Provisioning with Shell Scripts

Today marks a shift in my DevOps journey — moving from manual configuration to automated provisioning using Vagrant and shell scripts.

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🧱 The Challenge with Manual Setup

Last week, I provisioned:

• MySQL

• Memcached

• RabbitMQ

• Tomcat

• Nginx

...manually in multi-stage VMs using Vagrant. While this helped me understand how each service works, it’s not practical to repeat it over and over.

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✅ Automating with .sh Provision Scripts

To make the setup reusable and reproducible, I created individual shell scripts for each service:

├── Vagrantfile
├── provisioning/
│   ├── db-provision.sh
│   ├── mc-provision.sh
│   ├── rmq-provision.sh
│   ├── app-provision.sh
│   └── web-provision.sh

Each .sh script handles everything from package installation to firewall configuration for its service.

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📦 Example Vagrantfile (Multi-VM with Shell Provisioning)

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.box = "generic/centos7"

  config.vm.define "db01" do |db|
    db.vm.hostname = "db01"
    db.vm.network "private_network", ip: "192.168.56.11"
    db.vm.provision "shell", path: "provisioning/db-provision.sh"
  end

  config.vm.define "mc01" do |mc|
    mc.vm.hostname = "mc01"
    mc.vm.network "private_network", ip: "192.168.56.12"
    mc.vm.provision "shell", path: "provisioning/mc-provision.sh"
  end

  config.vm.define "rmq01" do |rmq|
    rmq.vm.hostname = "rmq01"
    rmq.vm.network "private_network", ip: "192.168.56.13"
    rmq.vm.provision "shell", path: "provisioning/rmq-provision.sh"
  end

  config.vm.define "app01" do |app|
    app.vm.hostname = "app01"
    app.vm.network "private_network", ip: "192.168.56.14"
    app.vm.provision "shell", path: "provisioning/app-provision.sh"
  end

  config.vm.define "web01" do |web|
    web.vm.hostname = "web01"
    web.vm.network "private_network", ip: "192.168.56.15"
    web.vm.provision "shell", path: "provisioning/web-provision.sh"
  end
end

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🚀 Benefits So Far

• 🔁 Repeatable setup across environments

• 🧩 Modular configuration for each service

• 📂 Easy debugging and reusability

• 💨 Faster deployment compared to manual setup

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🎯 What’s Next?

In the next steps, I’ll dive into basics of networking