azure - 如何仅将一个静态公共(public) IP 分配给 AKS-multi AZ 负载均衡器

Question

我正在设置一个多可用区 AKS 集群，我想将我创建的静态公共(public) IP 分配给此负载均衡器。这是我所拥有的:

#### Creating a Public static IP ####
resource "azurerm_public_ip" "lb-public-ip1" {
  name                = "${var.public_ip_name}"
  location            = "${var.location}"
  resource_group_name = "${var.resource_group_name}"
  allocation_method   = "Static"
  ip_version          = "IPv4"
  sku                 = "standard"
  #domain_name_label   =
  tags = {
    Environment = "${var.environment}"
    owner       = "${var.resource_owner}"
    created-by  = "${var.policy_created_by}"
  }
  depends_on    = ["null_resource.module_depends_on"]
}
data "azurerm_public_ip" "lb-public-ip1" {
  name                = "${azurerm_public_ip.lb-public-ip1.name}"
  resource_group_name = "${azurerm_public_ip.lb-public-ip1.resource_group_name}"
  depends_on          = ["null_resource.module_depends_on"]
}
resource "null_resource" "module_depends_on" {
  triggers = {
    value = "${length(var.module_depends_on)}"
  }
}

#### Creating AKS Cluster ####
resource "azurerm_kubernetes_cluster" "k8s" {
    name                = "${var.cluster_name}"
    location            = "${var.location}"
    resource_group_name = "${var.resource_group_name}"
    dns_prefix          = "${var.dns_prefix}"
    kubernetes_version  = "1.14.8"
    linux_profile {
        admin_username = "ubuntu"

        ssh_key {
            key_data = "${var.key_data}"
        }
    }

    default_node_pool {
        availability_zones    = ["1","2"]
        enable_auto_scaling   = true 
        enable_node_public_ip = false 
        max_count             = "8" 
        min_count             = "2" 
        name                  = "default" 
        node_count            = "${var.node_count}"  
        os_disk_size_gb       = "${var.os_disk_size}" 
        type                  = "VirtualMachineScaleSets" 
        vm_size               = "Standard_DS2_v2"
       }

    role_based_access_control {
          enabled = true
    }
    service_principal {
        client_id      = "${var.client_id}"
        client_secret  = "${var.client_secret}"
    }
    addon_profile {
        kube_dashboard {
              enabled = true
        }
        oms_agent {
        enabled                    = "${var.oms_agent_activation}"
        log_analytics_workspace_id = "${var.log_analytics_workspace_id}"
        }
    }
    network_profile {
        network_plugin    = "kubenet"
        load_balancer_sku = "Standard"
        load_balancer_profile {
            outbound_ip_address_ids = [ "${azurerm_public_ip.lb-public-ip1.id}" ]

        }
    }
    tags = {
        Environment = "${var.environment}"
        Name        = "${var.cluster_name}"
        owner       = "${var.resource_owner}"
        created-by  = "${var.policy_created_by}"
    }
    depends_on       = [azurerm_public_ip.lb-public-ip1]
}

通过此设置，它创建了一个名为 kubernetes 的 AKS 集群和 LoadBalancer，并将我创建的静态公共(public) IP 分配给 LoadBalancer，而没有分配任何 LB 规则，我可以在“前端 IP 配置”下看到它还创建了另一个IP 以及所有 LoadBalancer 规则和 HealthProbes 都分配给自动创建的该 IP。除此之外，还创建了两个后端池:kubernetes(2 个虚拟机)和 aksOutboundBackendPool(2 个虚拟机)

在 Azure 文档中，它说:“默认情况下，如果未指定公共(public) IP、公共(public) IP 前缀或 IP 数量，将自动在与 AKS 群集相同的资源组中创建一个公共(public) IP。”但就我而言，我指定了 PublicIP!

我想知道为什么它自己创建另一个IP？如何跳过自动创建的 IP，而仅使用我创建并分配给 loadbalancer-profile 的 IP，以及 AKS 如何将 LoadBalancer 规则和运行状况探测分配给我分配的 IP？

拥有多个公网IP有什么必要？

最后，我将使用分配给 istio 入口网关的 PublicIP。这就是为什么我只需要一个特定的公共(public) IP。

我应该使用哪个后端池？

我只需要一个对 Prod Env 具有高可用性的 AKS 集群，以防万一一个区域中的集群出现故障，它会启动第二个区域中的集群。

如有任何帮助，我们将不胜感激。

Answer 1

据我所知，当您创建AKS并创建静态公共(public)IP以通过Terraform分配给其出站时，您只需要创建公共(public)IP和AKS集群，不需要使用数据 源和 null_resource。所以你的代码可以改成这样:

#### Creating a Public static IP ####
resource "azurerm_public_ip" "lb-public-ip1" {
  name                = "${var.public_ip_name}"
  location            = "${var.location}"
  resource_group_name = "${var.resource_group_name}"
  allocation_method   = "Static"
  ip_version          = "IPv4"
  sku                 = "standard"
  #domain_name_label   =
  tags = {
    Environment = "${var.environment}"
    owner       = "${var.resource_owner}"
    created-by  = "${var.policy_created_by}"
  }
}


#### Creating AKS Cluster ####
resource "azurerm_kubernetes_cluster" "k8s" {
    name                = "${var.cluster_name}"
    location            = "${var.location}"
    resource_group_name = "${var.resource_group_name}"
    dns_prefix          = "${var.dns_prefix}"
    kubernetes_version  = "1.14.8"
    linux_profile {
        admin_username = "ubuntu"

        ssh_key {
            key_data = "${var.key_data}"
        }
    }

    default_node_pool {
        availability_zones    = ["1","2"]
        enable_auto_scaling   = true 
        enable_node_public_ip = false 
        max_count             = "8" 
        min_count             = "2" 
        name                  = "default" 
        node_count            = "${var.node_count}"  
        os_disk_size_gb       = "${var.os_disk_size}" 
        type                  = "VirtualMachineScaleSets" 
        vm_size               = "Standard_DS2_v2"
       }

    role_based_access_control {
          enabled = true
    }
    service_principal {
        client_id      = "${var.client_id}"
        client_secret  = "${var.client_secret}"
    }
    addon_profile {
        kube_dashboard {
              enabled = true
        }
        oms_agent {
        enabled                    = "${var.oms_agent_activation}"
        log_analytics_workspace_id = "${var.log_analytics_workspace_id}"
        }
    }
    network_profile {
        network_plugin    = "kubenet"
        load_balancer_sku = "Standard"
        load_balancer_profile {
            outbound_ip_address_ids = [ "${azurerm_public_ip.lb-public-ip1.id}" ]

        }
    }
    tags = {
        Environment = "${var.environment}"
        Name        = "${var.cluster_name}"
        owner       = "${var.resource_owner}"
        created-by  = "${var.policy_created_by}"
    }
    depends_on       = [azurerm_public_ip.lb-public-ip1]
}

并且会有两个后端池:aksOutboundBackendPool 和 kubernetes，以及一个出站规则:aksOutboundRule。没有磅规则和探针。一定是其他事情造成的。