Professional managed Kubernetes clusters are developed on top of managed Kubernetes clusters. This type of cluster provides higher reliability, security, and schedulability, and is covered by terms of the service level agreement (SLA) that supports compensation. Professional managed Kubernetes clusters are suitable for enterprises that require higher security and stability for large-scale business deployed in a production environment. This topic describes how to create a professional managed Kubernetes cluster in the Container Service for Kubernetes (ACK) console.
When you create a cluster of Container Service for Kubernetes (ACK), note the following limits:
- SLB instances that are created together with the ACK cluster support only the pay-as-you-go billing method.
- ACK clusters support only Virtual Private Cloud (VPC) networks.
- 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.
- For more information about the quotas of clusters and nodes that can be created by
each account, see Quota limits on ACK.
Notice By default, you can add up to 48 route entries to each VPC network in an ACK cluster. This means that you can deploy up to 48 nodes in an ACK cluster that uses Flannel. An ACK cluster that uses Terway is not subject to this limit. To increase the quota of route entries for a VPC network, submit a ticket.
- You can create up to 100 security groups under each account.
- You can create up to 60 pay-as-you-go SLB instances under each account.
- You can create up to 20 elastic IP addresses (EIPs) under each account.
- For more information about the quotas of clusters and nodes that can be created by each account, see Quota limits on ACK.
- Log on to the ACK console.
- In the left-side navigation pane of the ACK console, click Clusters.
- In the upper-right corner of the Clusters page, click Cluster Template.
- In the Select Cluster Template dialog box, select Professional Managed Kubernetes Cluster and click Create.
- On the Managed Kubernetes tab, 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 Professional to create a professional managed 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 to which the cluster belongs. The name of the selected resource group is displayed, as shown in the following figure. Time Zone
Select a time zone for the ACK cluster. By default, the time zone configured for your browser is selected.
The supported Kubernetes versions.
Container RuntimeContainerd, Docker, and Sandboxed-Container are supported. For more information, see How do I choose between Docker and Sandboxed-Container?.Note The Containerd runtime is in public preview. To use Containerd, Submit a ticket to apply for it to be available for your account. VPCSelect a virtual private cloud (VPC) to deploy the cluster. Shared VPCs and standard 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 Work with VPCs.
- Shared VPC: The owner of a VPC (resource owner) can share vSwitches in the VPC within the account of the owner with other accounts in the same organization.
- Standard VPC: The owner of a VPC (resource owner) cannot share vSwitches in the VPC within the account of the owner with other accounts.
Network Plug-inSelect a network plug-in. Flannel and Terway are supported. For more information, see Comparison between Flannel and Terway.
- Flannel: a simple and stable Container Network Interface (CNI) plug-in that is developed by the Kubernetes community. Flannel provides a few simple features. However, it does not support standard Kubernetes network policies.
- Terway: a network plug-in that is developed by ACK. Terway allows you to assign elastic
network interfaces (ENIs) of Alibaba Cloud to containers. It also allows you to customize
Kubernetes network policies to control intercommunication among containers and implement bandwidth throttling
on individual containers.
- The number of pods that can be deployed on a node depends on the number of ENIs that are attached to the node and the maximum number of secondary IP addresses that are provided by these ENIs.
- If you select a shared VPC for an ACK cluster, you must select Terway as the network plug-in.
- If you select Terway, an ENI is shared among multiple pods. A secondary IP address of the ENI is assigned to each pod.
Pod CIDR Block
If you select Flannel, you must set Pod CIDR Block.
The CIDR block specified by Pod CIDR Block cannot overlap with that of the VPC or those of the existing clusters in the VPC. The CIDR block cannot be modified 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.
Terway ModeIf you select Terway for Network Plug-in, you must set Terway Mode.
Select or clear Assign One ENI to Each Pod.
- If you select the check box, an ENI is assigned to each pod.
- If you clear the check box, an ENI is shared among multiple pods. A secondary IP address that is provided by the ENI is assigned to each pod.
Select or clear IPVLAN.
Note To select the Assign One ENI to Each Pod option,you must submit a ticket to apply for this option to be available for your account.
- This option is available only when you clear Assign One ENI to Each Pod.
- If you select IPVLAN, IPVLAN and extended Berkeley Packet Filter (eBPF) are used for network virtualization when an ENI is shared among multiple pods. This improves network performance. Only the Alibaba Cloud Linux 2 operating system is supported.
- If you clear IPVLAN, policy-based routes are used for network virtualization when an ENI is shared among multiple pods. The CentOS 7 and Alibaba Cloud Linux 2 operating systems are supported. This is the default setting.
Select or clear Support for NetworkPolicy.
- The NetworkPolicy feature is available only when you clear Assign One ENI to Each Pod. By default, Assign One ENI to Each Pod is unselected.
- If you select Support for NetworkPolicy, you can use Kubernetes network policies to control communication among pods.
- If you clear Support for NetworkPolicy, you cannot use Kubernetes network policies to control communication among pods. This prevents Kubernetes network policies from overloading on the Kubernetes API server.
Set Service CIDR. The CIDR block specified by Service CIDR cannot overlap with that of the VPC or those of the existing clusters in the VPC. The CIDR block cannot be modified 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.
IP Addresses per NodeIf you select Flannel, you must set the number of 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. 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. Then, ACK creates a Network Address Translation (NAT) gateway and configures Source Network Address Translation (SNAT) entries 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 specifications of the SLB instance. For more information, see Instance types and specifications.Notice If you delete the SLB instance, you cannot access the 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.
- If you select this check box, an elastic IP address (EIP) is created and attached to 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 only by using kubeconfig from within the VPC.
RDS WhitelistSet the Relational Database Service (RDS) whitelist. Add the IP addresses of 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
You can select Create Basic Security Group, Create Advanced Security Group, or Select Existing Security Group. For more information, see Overview.
Secret Encryption If you select Select Key, you can use a key that is created in the Key Management Service (KMS) console to encrypt Kubernetes Secrets. For more information, see Use KMS to encrypt Kubernetes secrets at rest in the etcd.
- Configure advanced settings of the cluster.
Parameter Description Kube-proxy ModeIPVS and iptables 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 nodes. 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 must be 1 to 128 characters in length and cannot start with http:// or https://. This parameter can be empty.
- 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 one that uses the same key.
- You can add up to 20 labels to each resource. 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.
Cluster DomainSet the domain name of the cluster.Note The default domain name is cluster.local. You can enter a custom domain name. A domain name consists of two parts. Each part must be 1 to 63 characters in length and can contain only letters and digits. You cannot leave these parts empty. Custom Certificate SANs
You can enter custom subject alternative names (SANs) for the API server certificate of the cluster to accept requests from specified IP addresses or domain names.
Service Account Token Volume Projection
Service account token volume projection reduces security risks when pods use service accounts to access the API server. This feature enables kubelet to request and store the token on behalf of the pod. This feature also allows you to configure token properties, such as the audience and validity duration. For more information, see Enable service account token volume projection.
Specify whether to enable deletion protection. If you select this check box, the ACK cluster cannot be deleted in the console or by calling the API. This prevents user errors.
- Configure basic settings of the cluster.
- Click Next:Worker Configurations to configure worker nodes.
- Set Worker Instance.
- If you select Create Instance, you must set the parameters as described in the following table.
Parameter Description Billing MethodThe pay-as-you-go and subscription billing methods are supported. If you select pay-as-you-go, you must set the following parameters:
- Duration: You can select 1, 2, 3, or 6 months. If you require a longer duration, you can select 1 to 5 years.
- Auto Renewal: Specify whether to enable auto renewal.
You can select multiple instance types. For more information, see Instance families.
The selected instance types are displayed.
Specify the number of worker nodes (ECS instances) to be created.Note Quantity can be set to 0. A professional managed Kubernetes cluster can contain no worker node.
System DiskEnhanced SSDs, SSDs, and ultra disks are supported.Note
- You can select Enable Backup to back up disk data.
- If you select an enhanced SSD as the system disk, you can also set a custom performance level for the 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 of ESSDs.
Mount Data Disk
Enhanced SSDs, SSDs, and ultra disks are supported. You can enable disk encryption and backup when you mount data disks.
Operating SystemACK supports the following node operating systems:
- Alibaba Cloud Linux 2. This is the default operating system.
- CentOS 7.x
Note CentOS 8.x and later are not supported.
- Key pair logon.
- Key Pair: Select an SSH key pair from the drop-down list.
- create a key pair: Create an SSH key pair if none is available. For more information about how to create an SSH key pair, see Create an SSH key pair. After the key pair is created, set it as the credential that is used to log on to the cluster.
- Password logon.
- Password: Enter the password that is used to log on to the nodes.
- Confirm Password: Enter the password again.
- If you select Add Existing Instance, you must select Elastic Compute Service (ECS) instances that are deployed in the region where the cluster is deployed. Then, set Operating System, Logon Type, and Key Pair based on the preceding settings.
- If you select Create Instance, you must set the parameters as described in the following table.
- Configure advanced settings of worker nodes.
Parameter Description Node ProtectionSpecify whether to enable node protection.Note By default, this check box is selected. This way, nodes in the cluster cannot be deleted in the console or by calling the API. This prevents user errors. User Data
For more information, see Prepare user data.
Custom ImageYou can select a custom image for your nodes. After you select a custom image, all nodes in the cluster are deployed by using the image. For more information about how to create a custom image, see Create a Kubernetes cluster by using a custom image.Note
- Only custom images based on CentOS 7.x and Alibaba Cloud Linux 2.x are supported.
- To use this feature, you must submit a ticket to apply for this feature to be enabled on your account.
Custom Node Name
Specify whether to use a custom node name.A node name consists of a prefix, an IP substring, and a suffix.
- Both the prefix and suffix can contain one or more parts that are separated with periods (.). These parts can contain lowercase letters, digits, and hyphens (-), and must start and end with a lowercase letter or digit.
- The IP substring length specifies the number of digits to be truncated from the end of the returned node IP address. Valid values: 5 to 12.
For example, if the node IP address is 192.1xx.x.xx, the prefix is aliyun.com, the IP substring length is 5, and the suffix is test, the node name will be aliyun.com00055test.
CPU PolicySet the CPU policy.
- none: This policy indicates that the default CPU affinity is used. This is the default policy.
- static: This policy allows pods with specific resource characteristics on the node to be granted with enhanced CPU affinity and exclusivity.
Add taints to worker nodes in the ACK cluster.
- Set Worker Instance.
- Click Next:Component Configurations to configure components.
Parameter Description Ingress
Specify whether to install Ingress controllers. By default, Install Ingress Controllers is selected. For more information, see Configure an Ingress.
Select a volume plug-in. FlexVolume and CSI are supported. An ACK cluster can be automatically bound to cloud disks of Alibaba Cloud, Network Attached Storage (NAS) file systems, and Object Storage Service (OSS) buckets that are mounted to pods in the cluster. For more information, see Storage management-FlexVolume and Storage management-CSI.
Specify whether to install the Cloud Monitor agent. By default, Install CloudMonitor Agent on ECS Instance and Enable Prometheus Monitoring are selected. After the Cloud Monitor agent is installed on ECS instance-based nodes, you can view monitoring data about the nodes in the Cloud Monitor console.
Specify whether to enable Log Service. You can select an existing Log Service project or create a new one. By default, Enable Log Service is selected. When you create an application, you can perform a few simple steps to enable Log Service. For more information, see Use Log Service to collect container logs.You can also select or clear Collect Logs of Control Plane Components. If you select this check box, logs of components on the ACK control plane are collected to the specified Log Service project within your account. For more information, see Collect log data of control plane components from a managed Kubernetes cluster.Note By default, Collect Logs of Control Plane Components is selected for a professional managed Kubernetes cluster.
By default, Install node-problem-detector and Create Event Center is selected. You can also specify whether to create Ingress dashboards in the Log Service console.
Workflow EngineSpecify whether to enable Alibaba Cloud Genomics Compute Service (AGS).
- If you select this check box, the system automatically installs the AGS workflow plug-in when the system creates the ACK 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 and accept Terms of Service, and click Create Cluster. Note It requires about 10 minutes to create an ACK cluster that contains multiple nodes.
- After the cluster is created, you can find the cluster on the Clusters page in the console.
Click View Logs in the Actions column. On the Log Information page, you can view cluster logs. To view detailed log information, click Stack events.
- Click Details in the Actions column. On the details page of the cluster, 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.