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Terraform + Docker-Swarm setup

Deploy a docker-swarm environment in a VPC using Terraform

Includes

  • VPC
  • Internal DNS
  • EC2 instances
  • ALB
  • Security groups
  • IAM SSL
  • route53
  • docker, docker swarm
  • Jenkins
  • CI/CD

Prerequisites

Usage

Building the infra using terraform commands

The following steps will walk you through the process:

  1. Clone the repo::

    git clone https://github.com/sree-warrier/docker-swarm-tf.git

  2. Following should be created before terraform file execution::

    • Create a keypair or use an existing one
    • Update key pair under respective file main.tf, swarm-join.sh, connect.sh by changing the value "key-pair.pem".
    • Make sure that the key file should be copied under the infra-tf directory, were the terraform execution is processed
    • Configure aws credentials, update the access and secret keys in variable.tf
    • Updated your local public IP under the security group section in main.tf file

  3. infra-tf directory conatins the terraform file for infra setup, use the following steps::

    cd infra-tf
terraform init
terraform plan
terraform apply

  4. Once the infra is up, follow these steps for a slave to join the swarm.

    • Login to the Jump instance using the key

    • Execute this command in Jump box

      bash connect.sh <swarm-master-ip/hostname> <swarm-slave-ip/hostname>

      eg : bash connect.sh master.swarm-tf.com slave0.swarm-tf.com

  5. To increase the swarm-slave

    • Update the count value under the slave resource in main.tf file
    • Then follow the Step 4

  6. Jenkins

    • Installed and configured the Jenkins box. Following are the steps taken for CI/CD workflow through jenkins.
    • Publish over ssh is the plugin used for this task, installed and updated the remote host with swarm master hostname as configured in terrform file.
    • Created Jobs for build
    • Build trigger configured with the Poll SCM with cron (*/2 * * * *).
    • Updated the git repo in the configs.
    • Build configs are updated with the docker hub registery details.
    • Post build configs are updated with the deployment commands which has to be executed in the swarm master box.

Credits