infrastructure-as-code/openstack-tf/modules/docker_swarm/docker-swarm.tf

#
# Server groups for both the masters and the workers
#
resource "openstack_compute_servergroup_v2" "swarm_masters" {
  name     = "swarm_masters"
  policies = ["anti-affinity"]
}
resource "openstack_compute_servergroup_v2" "swarm_workers" {
  name     = "swarm_workers"
  policies = ["soft-anti-affinity"]
}
#
# Network for the NFS traffic
#
resource "openstack_networking_network_v2" "swarm_nfs_net" {
  name                  = var.swarm_nfs_private_network.network_name
  admin_state_up        = "true"
  external              = "false"
  description           = var.swarm_nfs_private_network.network_description
  dns_domain            = var.dns_zone.zone_name
  mtu                   = var.mtu_size
  port_security_enabled = true
  shared                = false
  region                = var.main_region
}

# Subnet
resource "openstack_networking_subnet_v2" "swarm_nfs_subnet" {
  name            = "swarm-nfs-net"
  description     = "Subnet used by the Swarm cluster and the NFS service"
  network_id      = openstack_networking_network_v2.swarm_nfs_net.id
  cidr            = var.swarm_nfs_private_network.network_cidr
  dns_nameservers = var.resolvers_ip
  ip_version      = 4
  enable_dhcp     = true
  no_gateway      = true
  allocation_pool {
    start = var.swarm_nfs_private_network.allocation_pool_start
    end   = var.swarm_nfs_private_network.allocation_pool_end
  }
}

#
# Security groups
#
resource "openstack_networking_secgroup_v2" "swarm_internal_traffic" {
  name                 = "swarm_internal_docker_traffic"
  delete_default_rules = "true"
  description          = "Traffic between the Docker Swarm nodes"
}
resource "openstack_networking_secgroup_rule_v2" "everything_udp" {
  security_group_id = openstack_networking_secgroup_v2.swarm_internal_traffic.id
  description       = "UDP traffic between Swarm nodes"
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "udp"
  remote_ip_prefix  = var.main_private_subnet.cidr
}
resource "openstack_networking_secgroup_rule_v2" "everything_tcp" {
  security_group_id = openstack_networking_secgroup_v2.swarm_internal_traffic.id
  description       = "TCP traffic between Swarm nodes"
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  remote_ip_prefix  = var.main_private_subnet.cidr
}
resource "openstack_networking_secgroup_v2" "swarm_nfs_traffic" {
  name                 = "docker_swarm_nfs"
  delete_default_rules = "true"
  description          = "Traffic between Docker Swarm and the NFS service"
}
resource "openstack_networking_secgroup_rule_v2" "swarm_nfs_udp" {
  security_group_id = openstack_networking_secgroup_v2.swarm_nfs_traffic.id
  description       = "UDP traffic"
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "udp"
  remote_ip_prefix  = var.swarm_nfs_private_network.network_cidr
}
resource "openstack_networking_secgroup_rule_v2" "swarm_nfs_tcp" {
  security_group_id = openstack_networking_secgroup_v2.swarm_nfs_traffic.id
  description       = "TCP traffic"
  direction         = "ingress"
  ethertype         = "IPv4"
  protocol          = "tcp"
  remote_ip_prefix  = var.swarm_nfs_private_network.network_cidr
}

#
# Swarm Manager VMs
#
# Instance
resource "openstack_compute_instance_v2" "docker_swarm_managers" {
  count                   = var.docker_swarm_data.mgr_count
  name                    = format("%s-%02d", var.docker_swarm_data.mgr_name, count.index + 1)
  availability_zone_hints = var.availability_zones_names.availability_zone_no_gpu
  flavor_name             = var.docker_swarm_data.mgr_flavor
  key_pair                = module.ssh_settings.ssh_key_name
  security_groups         = [openstack_networking_secgroup_v2.default.name, openstack_networking_secgroup_v2.swarm_internal_traffic.name]
  scheduler_hints {
    group = openstack_compute_servergroup_v2.swarm_masters.id
  }
  block_device {
    uuid                  = var.ubuntu_2204.uuid
    source_type           = "image"
    volume_size           = 10
    boot_index            = 0
    destination_type      = "volume"
    delete_on_termination = false
  }

  block_device {
    source_type           = "blank"
    volume_size           = var.docker_swarm_data.mgr_data_disk_size
    boot_index            = -1
    destination_type      = "volume"
    delete_on_termination = false
  }

  network {
    name        = var.main_private_network.name
    fixed_ip_v4 = var.swarm_managers_ip.* [count.index]
  }
  network {
    name = var.swarm_nfs_private_network.network_name
  }

  user_data  = file("${var.ubuntu2204_data_file}")
  depends_on = [openstack_networking_subnet_v2.swarm_nfs_subnet]
  # Do not replace the instance when the ssh key changes
  lifecycle {
    ignore_changes = [
      # Ignore changes to tags, e.g. because a management agent
      # updates these based on some ruleset managed elsewhere.
      key_pair, user_data, network
    ]
  }

}

# Swarm worker nodes
resource "openstack_compute_instance_v2" "docker_swarm_workers" {
  count                   = var.docker_swarm_data.worker_count
  name                    = format("%s-%02d", var.docker_swarm_data.worker_name, count.index + 1)
  availability_zone_hints = var.availability_zones_names.availability_zone_no_gpu
  flavor_name             = var.docker_swarm_data.worker_flavor
  key_pair                = module.ssh_settings.ssh_key_name
  security_groups         = [var.default_security_group_name, openstack_networking_secgroup_v2.swarm_internal_traffic.name]
  scheduler_hints {
    group = openstack_compute_servergroup_v2.swarm_workers.id
  }
  block_device {
    uuid                  = var.ubuntu_2204.uuid
    source_type           = "image"
    volume_size           = 10
    boot_index            = 0
    destination_type      = "volume"
    delete_on_termination = false
  }

  block_device {
    source_type           = "blank"
    volume_size           = var.docker_swarm_data.worker_data_disk_size
    boot_index            = -1
    destination_type      = "volume"
    delete_on_termination = false
  }

  network {
    name = var.main_private_network.name
  }
  network {
    name = var.swarm_nfs_private_network.network_name
  }
  network {
    name = var.networks_list.shared_postgresql
  }

  user_data  = file("${var.ubuntu2204_data_file}")
  depends_on = [openstack_networking_subnet_v2.swarm_nfs_subnet]
  # Do not replace the instance when the ssh key changes
  lifecycle {
    ignore_changes = [
      # Ignore changes to tags, e.g. because a management agent
      # updates these based on some ruleset managed elsewhere.
      key_pair, user_data, network
    ]
  }
}

# NFS server
# Block device
resource "openstack_blockstorage_volume_v3" "swarm_nfs_data_vol" {
  name = var.docker_swarm_data.nfs_server_data_disk_name
  size = var.docker_swarm_data.nfs_server_data_disk_size
}

# Instance
resource "openstack_compute_instance_v2" "swarm_nfs_server" {
  name                    = var.docker_swarm_data.nfs_server_name
  availability_zone_hints = var.availability_zones_names.availability_zone_no_gpu
  flavor_name             = var.docker_swarm_data.nfs_server_flavor
  key_pair                = module.ssh_settings.ssh_key_name
  security_groups         = [openstack_networking_secgroup_v2.default.name, openstack_networking_secgroup_v2.swarm_nfs_traffic.name]
  block_device {
    uuid                  = var.ubuntu_2204.uuid
    source_type           = "image"
    volume_size           = 10
    boot_index            = 0
    destination_type      = "volume"
    delete_on_termination = false
  }

  network {
    name = var.main_private_network.name
  }
  network {
    name        = var.swarm_nfs_private_network.network_name
    fixed_ip_v4 = var.swarm_nfs_private_network.server_ip
  }

  user_data  = file("${var.ubuntu2204_data_file}")
  depends_on = [openstack_networking_subnet_v2.swarm_nfs_subnet]
}

# Attach the additional volume
resource "openstack_compute_volume_attach_v2" "swarm_nfs_data_attach_vol" {
  instance_id = openstack_compute_instance_v2.swarm_nfs_server.id
  volume_id   = openstack_blockstorage_volume_v3.swarm_nfs_data_vol.id
  device      = var.docker_swarm_data.nfs_server_data_disk_device
  depends_on  = [openstack_compute_instance_v2.swarm_nfs_server]
}

#
# Octavia
#
# Swarm load balancer. L4, backed by Octavia
resource "openstack_lb_loadbalancer_v2" "swarm_lb" {
  vip_subnet_id         = var.main_private_subnet_id
  name                  = var.octavia_swarm_data.swarm_lb_name
  description           = var.octavia_swarm_data.swarm_lb_description
  flavor_id             = var.octavia_swarm_data.octavia_flavor_id
  vip_address           = var.octavia_swarm_data.swarm_octavia_main_ip
  loadbalancer_provider = "amphora"
}

# Allocate a floating IP
resource "openstack_networking_floatingip_v2" "swarm_lb_ip" {
  pool = var.floating_ip_pools.main_public_ip_pool
  # The DNS association does not work because of a bug in the OpenStack API
  # dns_name = "main-lb"
  # dns_domain = var.dns_zone.zone_name
  description = var.octavia_swarm_data.swarm_lb_description
}

resource "openstack_networking_floatingip_associate_v2" "swarm_lb" {
  floating_ip = openstack_networking_floatingip_v2.swarm_lb_ip.address
  port_id     = openstack_lb_loadbalancer_v2.swarm_lb.vip_port_id
}

locals {
  swarm_recordset_name     = "${var.octavia_swarm_data.swarm_lb_hostname}.${var.dns_zone.zone_name}"
  portainer_recordset_name = "portainer.${var.dns_zone.zone_name}"
  ccp_recordset_name       = "ccp.${var.dns_zone.zone_name}"
  cdn_recordset_name       = "cdn.${var.dns_zone.zone_name}"
  conductor_recordset_name = "conductor.${var.dns_zone.zone_name}"
}

resource "openstack_dns_recordset_v2" "swarm_lb_dns_recordset" {
  zone_id     = var.dns_zone_id
  name        = local.swarm_recordset_name
  description = "Public IP address of the load balancer in front of Docker Swarm"
  ttl         = 8600
  type        = "A"
  records     = [openstack_networking_floatingip_v2.swarm_lb_ip.address]
}

resource "openstack_dns_recordset_v2" "swarm_portainer_dns_recordset" {
  zone_id     = var.dns_zone_id
  name        = local.portainer_recordset_name
  description = "Portainer hostname"
  ttl         = 8600
  type        = "CNAME"
  records     = [local.swarm_recordset_name]
}

resource "openstack_dns_recordset_v2" "ccp_dns_recordset" {
  zone_id     = var.dns_zone_id
  name        = local.ccp_recordset_name
  description = "CCP hostname"
  ttl         = 8600
  type        = "CNAME"
  records     = [local.swarm_recordset_name]
}

resource "openstack_dns_recordset_v2" "cdn_dns_recordset" {
  zone_id     = var.dns_zone_id
  name        = local.cdn_recordset_name
  description = "CDN hostname"
  ttl         = 8600
  type        = "CNAME"
  records     = [local.swarm_recordset_name]
}

resource "openstack_dns_recordset_v2" "conductor_dns_recordset" {
  zone_id     = var.dns_zone_id
  name        = local.conductor_recordset_name
  description = "Conductor hostname"
  ttl         = 8600
  type        = "CNAME"
  records     = [local.swarm_recordset_name]
}

# Main HAPROXY stats listener
resource "openstack_lb_listener_v2" "swarm_haproxy_stats_listener" {
  loadbalancer_id = openstack_lb_loadbalancer_v2.swarm_lb.id
  protocol        = "TCP"
  protocol_port   = 8880
  description     = "Listener for the stats of the Docker Swarm HAPROXY instances"
  name            = "swarm_haproxy_stats_listener"
  allowed_cidrs   = [var.ssh_sources.d4s_vpn_1_cidr, var.ssh_sources.d4s_vpn_2_cidr, var.ssh_sources.s2i2s_vpn_1_cidr, var.ssh_sources.s2i2s_vpn_2_cidr]

}

resource "openstack_lb_pool_v2" "swarm_haproxy_stats_pool" {
  listener_id = openstack_lb_listener_v2.swarm_haproxy_stats_listener.id
  protocol    = "TCP"
  lb_method   = "LEAST_CONNECTIONS"
  name        = "swarm-haproxy-lb-stats"
  description = "Pool for the stats of the main HAPROXY instances"
  persistence {
    type = "SOURCE_IP"
  }
}

resource "openstack_lb_members_v2" "swarm_haproxy_stats_pool_members" {
  pool_id = openstack_lb_pool_v2.swarm_haproxy_stats_pool.id
  member {
    name          = "swarm mgr haproxy 1"
    address       = var.docker_swarm_data.mgr1_ip
    protocol_port = 8880
  }
  member {
    name          = "swarm mgr haproxy 2"
    address       = var.docker_swarm_data.mgr2_ip
    protocol_port = 8880
  }
  member {
    name          = "swarm mgr haproxy 3"
    address       = var.docker_swarm_data.mgr3_ip
    protocol_port = 8880
  }
}

resource "openstack_lb_monitor_v2" "swarm_haproxy_stats_monitor" {
  pool_id        = openstack_lb_pool_v2.swarm_haproxy_stats_pool.id
  name           = "swarm_haproxy_stats_monitor"
  type           = "TCP"
  delay          = 20
  timeout        = 5
  max_retries    = 3
  admin_state_up = true
}

# HAPROXY HTTP
resource "openstack_lb_listener_v2" "swarm_haproxy_http_listener" {
  loadbalancer_id = openstack_lb_loadbalancer_v2.swarm_lb.id
  protocol        = "TCP"
  protocol_port   = 80
  description     = "HTTP listener of the Docker Swarm HAPROXY instances"
  name            = "swarm_haproxy_http_listener"
  admin_state_up  = true
}

resource "openstack_lb_pool_v2" "swarm_haproxy_http_pool" {
  listener_id = openstack_lb_listener_v2.swarm_haproxy_http_listener.id
  protocol    = "PROXYV2"
  lb_method   = "LEAST_CONNECTIONS"
  name        = "swarm-haproxy-lb-http"
  description = "Pool for the HTTP listener of the Docker Swarm HAPROXY instances"
  persistence {
    type = "SOURCE_IP"
  }
  admin_state_up = true
}

resource "openstack_lb_members_v2" "swarm_haproxy_http_pool_members" {
  pool_id = openstack_lb_pool_v2.swarm_haproxy_http_pool.id
  member {
    name          = "swarm mgr haproxy 1"
    address       = var.docker_swarm_data.mgr1_ip
    protocol_port = 80
  }
  member {
    name          = "swarm mgr haproxy 2"
    address       = var.docker_swarm_data.mgr2_ip
    protocol_port = 80
  }
  member {
    name          = "swarm mgr haproxy 3"
    address       = var.docker_swarm_data.mgr3_ip
    protocol_port = 80
  }
}

resource "openstack_lb_monitor_v2" "swarm_haproxy_http_monitor" {
  pool_id        = openstack_lb_pool_v2.swarm_haproxy_http_pool.id
  name           = "swarm_haproxy_http_monitor"
  type           = "HTTP"
  http_method    = "GET"
  url_path       = "/_haproxy_health_check"
  expected_codes = "200"
  delay          = 20
  timeout        = 5
  max_retries    = 3
  admin_state_up = true
}

# HAPROXY HTTPS
resource "openstack_lb_listener_v2" "swarm_haproxy_https_listener" {
  loadbalancer_id = openstack_lb_loadbalancer_v2.swarm_lb.id
  protocol        = "TCP"
  protocol_port   = 443
  description     = "HTTPS listener of the main HAPROXY instances"
  name            = "swarm_haproxy_https_listener"
  admin_state_up  = true
}

resource "openstack_lb_pool_v2" "swarm_haproxy_https_pool" {
  listener_id = openstack_lb_listener_v2.swarm_haproxy_https_listener.id
  protocol    = "PROXYV2"
  lb_method   = "LEAST_CONNECTIONS"
  name        = "swarm-haproxy-lb-https"
  description = "Pool for the HTTPS listener of the Docker Swarm HAPROXY instances"
  persistence {
    type = "SOURCE_IP"
  }
  admin_state_up = true
}

resource "openstack_lb_members_v2" "swarm_haproxy_https_pool_members" {
  pool_id = openstack_lb_pool_v2.swarm_haproxy_https_pool.id
  member {
    name          = "swarm mgr haproxy 1"
    address       = var.docker_swarm_data.mgr1_ip
    protocol_port = 443
  }
  member {
    name          = "swarm mgr haproxy 2"
    address       = var.docker_swarm_data.mgr2_ip
    protocol_port = 443
  }
  member {
    name          = "swarm mgr haproxy 3"
    address       = var.docker_swarm_data.mgr3_ip
    protocol_port = 443
  }
}

resource "openstack_lb_monitor_v2" "swarm_haproxy_https_monitor" {
  pool_id        = openstack_lb_pool_v2.swarm_haproxy_https_pool.id
  name           = "swarm_haproxy_https_monitor"
  type           = "HTTPS"
  http_method    = "GET"
  url_path       = "/_haproxy_health_check"
  expected_codes = "200"
  delay          = 20
  timeout        = 5
  max_retries    = 3
  admin_state_up = true
}

# HAPROXY HTTP on port 8080
resource "openstack_lb_listener_v2" "swarm_haproxy_8080_listener" {
  loadbalancer_id = openstack_lb_loadbalancer_v2.swarm_lb.id
  protocol        = "TCP"
  protocol_port   = 8080
  description     = "HTTP port 8080 listener of the Docker Swarm HAPROXY instances"
  name            = "swarm_haproxy_8080_listener"
  admin_state_up  = true
}

resource "openstack_lb_pool_v2" "swarm_haproxy_8080_pool" {
  listener_id = openstack_lb_listener_v2.swarm_haproxy_8080_listener.id
  protocol    = "PROXYV2"
  lb_method   = "LEAST_CONNECTIONS"
  name        = "swarm-haproxy-lb-http-8080"
  description = "Pool for the HTTP port 8080 listener of the Docker Swarm HAPROXY instances"
  persistence {
    type = "SOURCE_IP"
  }
  admin_state_up = true
}

resource "openstack_lb_members_v2" "swarm_haproxy_8080_pool_members" {
  pool_id = openstack_lb_pool_v2.swarm_haproxy_8080_pool.id
  member {
    name          = "swarm mgr haproxy 1"
    address       = var.docker_swarm_data.mgr1_ip
    protocol_port = 8080
  }
  member {
    name          = "swarm mgr haproxy 2"
    address       = var.docker_swarm_data.mgr2_ip
    protocol_port = 8080
  }
  member {
    name          = "swarm mgr haproxy 3"
    address       = var.docker_swarm_data.mgr3_ip
    protocol_port = 8080
  }
}

resource "openstack_lb_monitor_v2" "swarm_haproxy_8080_monitor" {
  pool_id        = openstack_lb_pool_v2.swarm_haproxy_8080_pool.id
  name           = "swarm_haproxy_8080_monitor"
  type           = "HTTP"
  http_method    = "GET"
  url_path       = "/_haproxy_health_check"
  expected_codes = "200"
  delay          = 20
  timeout        = 5
  max_retries    = 3
  admin_state_up = true
}

output "swarm_loadbalancer_ip" {
  description = "Docker Swarm Load balancer IP address"
  value       = openstack_lb_loadbalancer_v2.swarm_lb.vip_address
}