This is the first post long time ago. A lot of things passed in my live, one of them: I dedicated a lot of time to learn and apply DevOps knowledge.

In these serie of posts (first of fifth) I want to reach these conditions:

  • I want to create a server with a script, for this I’m going to use Terraform.
  • I would like to have the possiblity of scale. I choosed Docker Swarm.
  • I need my own registry server for my images.
  • It’s mandatory to use SSL certificates and I know Traefik works fantastic with Let’s encrypt.
  • I expect to deploy in a easy way and Portainer has a good system to do it with a webhook.

First of all you can find the files used in this article here.

How to install Terraform.

Let’s take a 👀 to the main file.

I’m using DO but you could do it with other provider.

provider "digitalocean" {
  token = var.do_token
}

This token is defined as a variable into the vars file

variable "do_token" {
    description = "The token"
}

If you don’t define a “default value” you will asked for the value when you try to apply the script.

Here the type of the droplet:

resource "digitalocean_droplet" "docker_swarm" {
  image  = "ubuntu-20-10-x64"
  name   = "docker-swarm"
  region = "fra1"
  size   = "s-4vcpu-8gb"
  ssh_keys = [ "123123" ]
  user_data = file("userdata.yaml")
}

I choosed Ubuntu as server.

How to know your ssh_key id:

curl -X GET -H "Content-Type: application/json" -H "Authorization: Bearer here_your_token" "https://api.digitalocean.com/v2/account/keys"

At the begining of the respose you have the id:

{"ssh_keys":[{"id":123123,"fingerprint ...

May be you have some question about this file userdata.yaml. This is like a script to deploy after the machine is created. More info in this repo. If you want to know more deeply here some samples of configuration files.

In my case I only want to install docker dependencies:

#cloud-config
package_update: true
packages:
  - docker.io
  - docker-compose
  - vim
  - htop

I use the DO DNSs so I can update with the IP assigned easily.

resource "digitalocean_record" "edge" {
  domain = var.domain
  type   = "A"
  name   = "traefik"
  ttl    = "300"
  value  = digitalocean_droplet.docker_swarm.ipv4_address
}

Let’s launch the terraform:

terraform init
terraform validate
terraform plan
terraform apply

You need to paste the token:

$ terraform apply
var.do_token
  The token

  Enter a value:

After 1-2 minutes …

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.

Outputs:

connect_ssh = "ssh root@46.101.204.107"

The output is because we define into main file:

output "connect_ssh" {
  description = "How to connect to the New Server"
  value = "ssh root@${digitalocean_droplet.docker_swarm.ipv4_address}"
}

The Droplet:

droplet photo

And if we connect with the server with ssh:

root@docker-swarm:~# docker  ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

Well done! We have the base to start with the Docker Swarm.

See you soon in part 2.