Managed edge Kubernetes clusters are designed to bring cloud computing to edges (clients). Managed edge Kubernetes clusters can be created, managed, and maintained in the Container Service for Kubernetes (ACK) console. ACK is a platform built on top of the edge computing infrastructure. It is also integrated with cloud computing and edge computing. This topic describes how to create a managed edge Kubernetes cluster in the ACK console.
ACK, Auto Scaling (ESS), and Resource Access Management (RAM) are activated.
- Server Load Balancer (SLB) instances that are created along with an ACK cluster support only the pay-as-you-go billing method.
- ACK clusters support only virtual private clouds (VPCs).
- By default, each account has specific quotas on cloud resources that can be created.
You cannot create clusters if the quota is reached. Make sure that you have sufficient
quotas before you create a cluster. To request a quota increase, submit a ticket.
- By default, you can create up to 100 security groups with each account.
- By default, you can create up to 60 pay-as-you-go SLB instances with each account.
- By default, you can create up to 20 elastic IP addresses (EIPs) with each account.
- Log on to the Container Service for Kubernetes (ACK) console.
- In the left-side navigation pane of the ACK console, click Clusters.
- In the upper-right corner of the Clusters page, click Create Kubernetes Cluster.
- Click the Managed Edge Kubernetes tab and configure the cluster.
Configure basic settings of the cluster.
Parameter Description Cluster NameEnter a name for the ACK cluster.Note The name must be 1 to 63 characters in length, and can contain digits, letters, and hyphens (-). Cluster Specification
Select a cluster type. You can select Standard edition or Professional.
Select Standard edition to create a managed edge Kubernetes cluster.
Select a region to deploy the cluster.
Resource GroupMove the pointer over All Resources at the top of the page and select the resource group that you want to use. After you select a resource group, virtual private clouds (VPCs) and vSwitches are filtered based on the selected resource group. When you create a cluster, only the VPCs and vSwitches that belong to the selected resource group are displayed in the console. Kubernetes Version The supported Kubernetes versions are displayed. VPCSelect a VPC to deploy the cluster. Standard VPCs and shared VPCs are supported.
Note ACK clusters support only VPCs. You can select a VPC from the drop-down list. If no VPC is available, click Create VPC to create one. For more information, see Create a VPC.
- Shared VPC: The owner of a VPC (resource owner) can share the vSwitches in the VPC with other accounts in the same organization.
- Standard VPC: The owner of a VPC (resource owner) cannot share the vSwitches in the VPC with other accounts.
You can select up to three vSwitches that are deployed in different zones. If no vSwitch is available, click Create VSwitch to create one. For more information, see Create a vSwitch.
IP Addresses per NodeIf you select Flannel as the network plug-in, you must set IP Addresses per Node.Note
- IP Addresses per Node specifies the maximum number of IP addresses that can be assigned to each node. We recommend that you use the default value.
- After you select the VPC and specify the number of IP addresses per node, recommended values are automatically generated for Pod CIDR block and Service CIDR block. The system also provides the maximum number of nodes that can be deployed in the cluster and the maximum number of pods that can be deployed on each node. You can modify the values based on your business requirements.
Pod CIDR Block
If you select Flannel as the network plug-in, you must set Pod CIDR Block.
The CIDR blocks specified by Pod CIDR Block and Service CIDR cannot overlap with the CIDR block of the VPC and the CIDR blocks of the existing ACK clusters in the VPC. You cannot modify the CIDR blocks after the cluster is created. The Service CIDR block cannot overlap with the Pod CIDR block. For more information about subnetting for ACK clusters, see Plan CIDR blocks for an ACK cluster.
Service CIDR Configure SNAT
By default, an ACK cluster cannot access the Internet. If the VPC that you select for the ACK cluster cannot access the Internet, you can select Configure SNAT for VPC. This way, ACK will create a NAT gateway and configure Source Network Address Translation (SNAT) rules to enable Internet access for the VPC.
Access to API ServerBy default, an internal-facing Server Load Balancer (SLB) instance is created for the cluster API server. You can modify the specification of the SLB instance. For more information, see Instance types and specifications.Notice If you delete the SLB instance, you cannot access the cluster API server.Select or clear Expose API Server with EIP. The ACK API server provides multiple HTTP-based RESTful APIs, which can be used to create, delete, modify, query, and monitor resources, such as pods and Services.
Note Edge nodes must call the API over the Internet. If you clear Expose API Server with EIP, the edge nodes cannot be connected to the edge cluster. As a result, the created cluster cannot be used in edge computing scenarios.
- If you select this check box, an elastic IP address (EIP) is created and associated with an Internet-facing SLB instance. Port 6443 used by the API server is opened on master nodes. You can connect to and manage the ACK cluster by using kubeconfig over the Internet.
- If you clear this check box, no EIP is created. You can connect to and manage the ACK cluster by using kubeconfig only within the VPC.
RDS WhitelistSet the Relational Database Service (RDS) whitelist. Add the IP addresses of the nodes in the cluster to the RDS whitelist.Note To enable an RDS instance to access the cluster, you must deploy the RDS instance in the VPC where the cluster is deployed. Security Group Deletion Protection
Configure advanced settings of the cluster.
Parameter Description Kube-proxy Modeiptables and IPVS are supported.
- iptables is a mature and stable kube-proxy mode. It uses iptables rules to conduct service discovery and load balancing. The performance of this mode is restricted by the size of the ACK cluster. This mode is suitable for ACK clusters that manage a small number of Services.
- IPVS is a high-performance kube-proxy mode. It uses Linux Virtual Server (LVS) to conduct service discovery and load balancing. This mode is suitable for ACK clusters that manage a large number of Services. We recommend that you use this mode in scenarios where high-performance load balancing is required.
LabelsAdd labels to the cluster. Enter a key and a value, and click Add.Note
- Key is required. Value is optional.
- Keys are not case-sensitive. A key must be 1 to 64 characters in length, and cannot start with aliyun, http://, or https://.
- Values are not case-sensitive. A value can be empty and can contain up to 128 characters in length. It cannot be http:// or https://.
- The keys of labels that are added to the same resource must be unique. If you add a label with a used key, the label overwrites the others that use the same key.
- If you add more than 20 labels to a resource, all labels become invalid. You must remove excess labels for the remaining labels to take effect.
- Click Next:Worker Configurations to configure worker nodes. Note In a managed edge Kubernetes cluster, you must configure at least one worker node to deploy components.
Parameter Description Instance Type
You can select multiple instance types. For more information, see Instance families.Note To use advanced features such as logging, monitoring, and reverse tunneling, you must deploy the related components in the cloud. Therefore, you must create at least one Elastic Compute Service (ECS) instance as a worker node.
The selected instance types are displayed.
Specify the number of worker nodes (ECS instances) to be created.
System Disk Configure the system disks of worker nodes. Standard SSDs and ultra disks are supported. Mount Data DiskEnhanced SSDs, standard SSDs, and ultra disks are supported.Note
- You can select Enable Backup to back up disk data.
- If you select enhanced SSD as the system disk type, you can set a custom performance level for the system disk.
You can select higher performance levels for enhanced SSDs with larger storage capacities. For example, you can select performance level 2 for an enhanced SSD with a storage capacity of more than 460 GiB. You can select performance level 3 for an enhanced SSD with a storage capacity of more than 1,260 GiB. For more information, see Capacity and PLs.
Logon TypeNote You must set the logon type if you select Install CloudMonitor Agent on ECS Instance or Enable Log Service. Key Pair
- Click Next:Component Configurations to configure components.
Parameter Description CloudMonitor Agent Select whether to install the CloudMonitor agent. If you select Install CloudMonitor Agent on ECS Instance, you can view monitoring information about the nodes in the Cloud Monitor console. Log Service
Specify whether to enable Log Service. You can select an existing Log Service project or create one. By default, Enable Log Service is selected. When you create an application, you can enable Log Service through a few steps. For more information, see Collect log files from containers by using Log Service.
Workflow EngineSpecify whether to enable Alibaba Cloud Genomics Service (AGS).Note To use this feature, submit a ticket to apply to be added to a whitelist.
- If you select this check box, the system automatically installs the AGS workflow plug-in when the system creates the cluster.
- If you clear this check box, you must manually install the AGS workflow plug-in. For more information, see Introduction to AGS CLI.
- Click Next:Confirm Order.
- Read Terms of Service, select the check box, and then click Create Cluster. Note It requires about 10 minutes to create a managed edge Kubernetes cluster.
On the Clusters page, find the newly created cluster and click Details in the Actions column. On the details page of the cluster, you can click the Basic Information tab to view basic information about the cluster and click the Connection Information tab to view information about how to connect to the cluster.
- API Server Public Endpoint: the IP address and port that the API server uses to provide services over the Internet. It allows you to manage the cluster by using kubectl or other tools on your terminal.
- API Server Internal Endpoint: the IP address and port that the API server uses to provide services within the cluster. The IP address belongs to the SLB instance that is bound to the cluster.
- Testing Domain: the domain name that is used to test Services. The suffix of the domain name is
<cluster_id>.<region_id>.alicontainer.com.Note To rebind the domain name, click Rebind Domain Name.
kubectl get nodecommand to view information about the nodes in the cluster.