cloud-computing-msc-ai-examples/terraform/demo4-scale-out-lb/demo4-scale-out-lb.tf

# Define CloudComp group number
variable "group_number" {
  type = string
  default = "30"
}

# Define OpenStack credentials, project config etc.
locals {
  auth_url      = "https://private-cloud.informatik.hs-fulda.de:5000/v3"
  user_name     = "CloudComp${var.group_number}"
  user_password = "demo"
  tenant_name   = "CloudComp${var.group_number}"
  network_name  = "CloudComp${var.group_number}-net"
  image_name    = "Ubuntu 18.04 - Bionic Beaver - 64-bit - Cloud Based Image"
  flavor_name   = "m1.small"
  region_name   = "RegionOne"
}

# Define OpenStack provider
terraform {
required_version = ">= 0.14.0"
  required_providers {
    openstack = {
      source  = "terraform-provider-openstack/openstack"
      version = ">= 1.40.0"
    }
  }
}

# Configure the OpenStack Provider
provider "openstack" {
  user_name   = local.user_name
  tenant_name = local.tenant_name
  password    = local.user_password
  auth_url    = local.auth_url
  region      = local.region_name
  use_octavia = true
}

# import keypair
resource "openstack_compute_keypair_v2" "terraform-keypair" {
  name       = "my-terraform-pubkey"
  #public_key = file("~/.ssh/id_rsa.pub")
}

# create api security group
resource "openstack_networking_secgroup_v2" "terraform-secgroup-api" {
  name        = "my-terraform-secgroup-api"
  description = "for API services only"
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-api-rule-http" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 80
  port_range_max    = 80
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-api.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-api-rule-ssh" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 22
  port_range_max    = 22
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-api.id
}

# create worker security group
resource "openstack_networking_secgroup_v2" "terraform-secgroup-worker" {
  name        = "my-terraform-secgroup-worker"
  description = "for services that run on a worker node"
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-worker-rule-ssh" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 22
  port_range_max    = 22
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-worker.id
}

resource "openstack_networking_secgroup_v2" "terraform-secgroup-control" {
  name        = "my-terraform-secgroup-control"
  description = "for services that run on a control node"
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-control-rule-ssh" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 22
  port_range_max    = 22
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-control.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-control-rule-http" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 80
  port_range_max    = 80
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-control.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-control-rule-rabbitmq" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 5672
  port_range_max    = 5672
  remote_group_id   = openstack_networking_secgroup_v2.terraform-secgroup-worker.id
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-control.id
}

# create services security group
resource "openstack_networking_secgroup_v2" "terraform-secgroup-services" {
  name        = "my-terraform-secgroup-services"
  description = "for DB and AMQP services only"
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-services-rule-ssh" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 22
  port_range_max    = 22
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-services.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-services-rule-http" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 80
  port_range_max    = 80
  #remote_ip_prefix  = "0.0.0.0/0"
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-services.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-services-rule-mysql-api" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 3306
  port_range_max    = 3306
  remote_group_id   = openstack_networking_secgroup_v2.terraform-secgroup-api.id
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-services.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-services-rule-rabbitmq-worker" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 5672
  port_range_max    = 5672
  remote_group_id   = openstack_networking_secgroup_v2.terraform-secgroup-worker.id
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-services.id
}

resource "openstack_networking_secgroup_rule_v2" "terraform-secgroup-services-rule-rabbitmq-api" {
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  port_range_min    = 5672
  port_range_max    = 5672
  remote_group_id   = openstack_networking_secgroup_v2.terraform-secgroup-api.id
  security_group_id = openstack_networking_secgroup_v2.terraform-secgroup-services.id
}


###########################################################################
#
# create app-services instance
#
###########################################################################
resource "openstack_compute_instance_v2" "terraform-instance-app-services" {
  name              = "my-terraform-app-services"
  image_name        = local.image_name
  flavor_name       = local.flavor_name
  key_pair          = openstack_compute_keypair_v2.terraform-keypair.name
  security_groups   = [openstack_networking_secgroup_v2.terraform-secgroup-services.name]

  network {
    name = local.network_name
  }

  user_data = <<-EOF
    #!/usr/bin/env bash
    curl -L -s https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/faafo/contrib/install.sh | bash -s -- \
      -i database -i messaging
    rabbitmqctl add_user faafo guest
    rabbitmqctl set_user_tags faafo administrator
    rabbitmqctl set_permissions -p / faafo ".*" ".*" ".*"
  EOF
}

###########################################################################
#
# create app-api instances
#
###########################################################################
resource "openstack_compute_instance_v2" "terraform-instance-app-api-1" {
  name              = "my-terraform-app-api-1"
  image_name        = local.image_name
  flavor_name       = local.flavor_name
  key_pair          = openstack_compute_keypair_v2.terraform-keypair.name
  security_groups   = [openstack_networking_secgroup_v2.terraform-secgroup-api.name]

  network {
    name = local.network_name
  }

  user_data = <<-EOF
    #!/usr/bin/env bash
    curl -L -s https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/faafo/contrib/install.sh | bash -s -- \
        -i faafo -r api -m 'amqp://faafo:guest@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:5672/' \
        -d 'mysql+pymysql://faafo:password@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:3306/faafo'
  EOF
}

resource "openstack_compute_instance_v2" "terraform-instance-app-api-2" {
  name            = "my-terraform-app-api-2"
  image_name      = local.image_name
  flavor_name     = local.flavor_name
  key_pair        = openstack_compute_keypair_v2.terraform-keypair.name
  security_groups = [openstack_networking_secgroup_v2.terraform-secgroup-api.id]

  network {
    name = local.network_name
  }

  user_data = <<-EOF
    #!/usr/bin/env bash
    curl -L -s https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/faafo/contrib/install.sh | bash -s -- \
        -i faafo -r api -m 'amqp://faafo:guest@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:5672/' \
        -d 'mysql+pymysql://faafo:password@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:3306/faafo'
  EOF
}

###########################################################################
#
# create worker instances
#
###########################################################################
resource "openstack_compute_instance_v2" "terraform-instance-app-worker-1" {
  name            = "my-terraform-app-worker-1"
  image_name      = local.image_name
  flavor_name     = local.flavor_name
  key_pair        = openstack_compute_keypair_v2.terraform-keypair.name
  security_groups = [openstack_networking_secgroup_v2.terraform-secgroup-worker.id]

  network {
    name = local.network_name
  }

  user_data = <<-EOF
    #!/usr/bin/env bash
    curl -L -s https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/faafo/contrib/install.sh | bash -s -- \
        -i faafo -r worker -e 'http://${openstack_compute_instance_v2.terraform-instance-app-api-1.access_ip_v4}' -m 'amqp://faafo:guest@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:5672/'
  EOF
}

resource "openstack_compute_instance_v2" "terraform-instance-app-worker-2" {
  name            = "my-terraform-app-worker-2"
  image_name      = local.image_name
  flavor_name     = local.flavor_name
  key_pair        = openstack_compute_keypair_v2.terraform-keypair.name
  security_groups = [openstack_networking_secgroup_v2.terraform-secgroup-worker.id]

  network {
    name = local.network_name
  }

  user_data = <<-EOF
    #!/usr/bin/env bash
    curl -L -s https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/faafo/contrib/install.sh | bash -s -- \
        -i faafo -r worker -e 'http://${openstack_compute_instance_v2.terraform-instance-app-api-1.access_ip_v4}' -m 'amqp://faafo:guest@${openstack_compute_instance_v2.terraform-instance-app-services.access_ip_v4}:5672/'
  EOF
}

###########################################################################
#
# create load balancer
#
###########################################################################
data "openstack_networking_network_v2" "network_1" {
  name = local.network_name
}

resource "openstack_lb_loadbalancer_v2" "lb_1" {
  vip_subnet_id = data.openstack_networking_network_v2.network_1.subnets[0]
}

resource "openstack_lb_listener_v2" "listener_1" {
  protocol        = "HTTP"
  protocol_port   = 80
  loadbalancer_id = openstack_lb_loadbalancer_v2.lb_1.id
  connection_limit = 1024
}

resource "openstack_lb_pool_v2" "pool_1" {
  protocol    = "HTTP"
  lb_method   = "ROUND_ROBIN"
  listener_id = openstack_lb_listener_v2.listener_1.id
}

resource "openstack_lb_members_v2" "members_1" {
  pool_id = openstack_lb_pool_v2.pool_1.id

  member {
    address       = openstack_compute_instance_v2.terraform-instance-app-api-1.access_ip_v4
    protocol_port = 80
  }

  member {
    address       = openstack_compute_instance_v2.terraform-instance-app-api-2.access_ip_v4
    protocol_port = 80
  }
}

resource "openstack_lb_monitor_v2" "monitor_1" {
  pool_id        = openstack_lb_pool_v2.pool_1.id
  type           = "HTTP"
  delay          = 5
  timeout        = 5
  max_retries    = 3
  http_method    = "GET"
  url_path       = "/"
  expected_codes = 200
}

###########################################################################
#
# assign floating ip to load balancer
#
###########################################################################
resource "openstack_networking_floatingip_v2" "fip_1" {
  pool    = "public1"
  port_id = openstack_lb_loadbalancer_v2.lb_1.vip_port_id
}

output "loadbalancer_vip_addr" {
  value = openstack_networking_floatingip_v2.fip_1
}