Container Service for Kubernetes:Methods to calculate ALB quotas

Scenario (see the preceding figure)

Create an alert rule for a quota item

You can create alert rules for some quota items by specifying a threshold for quota usage or available quota. If the usage of a quota reaches the specified threshold, the system sends an alert notification to the callback URL that you specified in the alert rule through an HTTP POST request. We recommend that you take the alerts into consideration and apply for a quota increase in advance to avoid reconciliation failures due to quota exceedance. Such failures can result in forwarding rules or backend nodes failing to mount to the ALB. Additionally, you can monitor the status of reconciliation by using the kubectl describe and kubectl get event commands to view details and events related to resources such as AlbConfig, Ingresses, and Services in the cluster.

Procedure (Quota Center)

1. Log on to the Quota Center console.

2. Use one of the following methods to create an alert rule:

   • Method 1: On the Products with General Quotas page, click Application Load Balancer in the Networking section, and then click the General Quota tab.

   • Method 2: In the left-side navigation pane, click Quota Alerts. On the Quota Alerts page, click Create Quota Alert Rule. On the General Quotas page, select Application Load Balancer from the Product Name drop-down list.

3. On the General Quotas page, find the quota that you want to manage and click Create Alert Rule in the Actions column.

4. On the Create Alarm Rule page, configure the parameters and click Confirm.

   Table 1 Parameters for creating an alert rule for a quota item

   Parameter	Description	Example
   Alarm Rule Name	The name of the alert rule.	Maximum number of vCPUs for preemptible instances for limited purchase
   Alarm Metric	The metric used by the alert rule. Valid values: Quotas Used Quotas Percentage of Used Quotas(%) Percentage of Available Quotas(%)	Percentage of Used Quotas(%)
   Threshold and Alert Level	The alert level and the threshold corresponding to this level. The following default notification methods are set for different alert levels: Critical: Email and Callback Warning: Email and Callback Info: Email and Callback You also need to select the number of times that the threshold is reached before an alert is triggered. Valid values: 1 Consecutive Cycle, 3 Consecutive Cycles, 5 Consecutive Cycles, 10 Consecutive Cycles, 15 Consecutive Cycles, 30 Consecutive Cycles, 60 Consecutive Cycles, 70 Consecutive Cycles, 90 Consecutive Cycles, 120 Consecutive Cycles, and 180 Consecutive Cycles. You can configure settings for different alert levels. This way, CloudMonitor generates alerts at a specific level based on the threshold corresponding to the level and sends alert notifications by using the specified methods.	Alert level: Info. The default notification method for this alert level is Email and Callback. Threshold: ≥ 80%.
   Mute For	The interval at which alert notifications are sent if the generated alert is not cleared. The value also indicates the silence period. Valid values: 5 minutes, 15 minutes, 30 minutes, 60 minutes, 3 hours, 6 hours, 12 hours, and 24 hours. An alert notification is sent when a metric reaches the alert threshold. During the silence period, if the metric repeatedly exceeds the alert threshold, no new alert notification is sent. After the silence period ends, if the metric does not return to the normal state, a new alert notification is sent. For example, if you set the Mute For parameter to 24 hours, CloudMonitor sends an alert notification for a generated alert, and the alert remains unresolved, CloudMonitor sends a new alert notification after 24 hours.	5 minutes
   Effective Time	The period during which the alert rule takes effect. The alert rule takes effect and generates alerts only at the specified time on the specified days of a week.	Cycle: Monday to Sunday Time: 00:00 to 23:59
   Alarm Contact Group	The contact group to which alert notifications are sent. Alert notifications for an application group are sent to the alert contact in the alert contact group. An alert contact group is a group of alert contacts, containing one or more alert contacts. For more information about how to create an alert contact or an alert contact group, see Create an alert contact or alert contact group.	Quota Administrators of ECS Instance Types
   Alarm Callback	The URL that is accessible over the Internet to receive the alert information pushed by CloudMonitor by using HTTP POST requests. Only the HTTP protocol is supported. To test the connectivity of the callback URL, perform the following operations: Click Test next to the callback URL. On the Test Result page, you can check the connectivity of the callback URL based on the returned status code and test result details. Note You can also set the Language parameter and then click Test again to obtain test result details of the specified language. Click Close.	http://alert.aliyun.com:8080/callback
   Labels	The tags of the alert rule. A tag consists of a tag key and a tag value. You can specify up to six tags for an alert rule.	k1,v1
   Push Channel	The Alibaba Cloud service used to deliver alert information. Valid values: Simple Log Service If you turn on Simple Log Service, when an alert is generated, alert information is sent to a Logstore in Simple Log Service. In this case, you must configure the Region, ProjectName, and Logstore parameters. For information about how to create a project and a Logstore, see Getting Started. Message Service - topic If you turn on Message Service - topic, when an alert is generated, alert information is sent to a topic in Simple Message Queue (formerly MNS). In this case, you must specify a region and a topic.Simple Message Queue (formerly MNS) For more information about how to create a topic, see Create a topic. Function Compute If you turn on Function Compute, when an alert is generated, alert information is sent to Function Compute to be formatted. In this case, you must specify a region, a service, and a function. For information about how to create a service and a function, see Quickly create a function.	Turn off all switches
   Recovery Notification	Specifies whether to send notifications when alerts are cleared. The switch is turned on by default.	Turn on the switch
   Method to handle alarms when no monitoring data is found	The method that is used to handle alerts when no monitoring data is available. Valid values: Do not do anything (default) Send alarm notifications Treated as normal	Do not do anything

5. In the left-side navigation pane, click Quota Alerts. On the Quota Alerts page, view the details about the alert rules.

   On the Quota Alerts page, you can manage alert rules. For example, you can view, modify, and delete alert rules.

6. Optional. View the result of an alert callback.

   If you configure the Alert Callback parameter, you can view the alert callback records and applications that are automatically submitted to increase the quota after the alert callback succeeds.

   1. In the left-side navigation pane, click Alert History to view the alert callback records.

      If Alert Callback is displayed in the Notification Methods column of the record, the alert callback succeeded.

   2. In the left-side navigation pane, click Application Records to view the application that is automatically submitted to increase the quota.

Procedure (SLB console)

1. Log on to the SLB console. In the left-side navigation pane, click Quota Center.

2. On the Quota Center page, click the ALB tab.

3. In the Quota Type section, click the General Quota tab, find the quota that you want to manage, and then click Create Alert Rule in the Actions column.

4. On the Create Alarm Rule page, configure the parameters and click Confirm.

   Table 1 Parameters for creating an alert rule for a quota item

   Parameter	Description	Example
   Alarm Rule Name	The name of the alert rule.	Maximum number of vCPUs for preemptible instances for limited purchase
   Alarm Metric	The metric used by the alert rule. Valid values: Quotas Used Quotas Percentage of Used Quotas(%) Percentage of Available Quotas(%)	Percentage of Used Quotas(%)
   Threshold and Alert Level	The alert level and the threshold corresponding to this level. The following default notification methods are set for different alert levels: Critical: Email and Callback Warning: Email and Callback Info: Email and Callback You also need to select the number of times that the threshold is reached before an alert is triggered. Valid values: 1 Consecutive Cycle, 3 Consecutive Cycles, 5 Consecutive Cycles, 10 Consecutive Cycles, 15 Consecutive Cycles, 30 Consecutive Cycles, 60 Consecutive Cycles, 70 Consecutive Cycles, 90 Consecutive Cycles, 120 Consecutive Cycles, and 180 Consecutive Cycles. You can configure settings for different alert levels. This way, CloudMonitor generates alerts at a specific level based on the threshold corresponding to the level and sends alert notifications by using the specified methods.	Alert level: Info. The default notification method for this alert level is Email and Callback. Threshold: ≥ 80%.
   Mute For	The interval at which alert notifications are sent if the generated alert is not cleared. The value also indicates the silence period. Valid values: 5 minutes, 15 minutes, 30 minutes, 60 minutes, 3 hours, 6 hours, 12 hours, and 24 hours. An alert notification is sent when a metric reaches the alert threshold. During the silence period, if the metric repeatedly exceeds the alert threshold, no new alert notification is sent. After the silence period ends, if the metric does not return to the normal state, a new alert notification is sent. For example, if you set the Mute For parameter to 24 hours, CloudMonitor sends an alert notification for a generated alert, and the alert remains unresolved, CloudMonitor sends a new alert notification after 24 hours.	5 minutes
   Effective Time	The period during which the alert rule takes effect. The alert rule takes effect and generates alerts only at the specified time on the specified days of a week.	Cycle: Monday to Sunday Time: 00:00 to 23:59
   Alarm Contact Group	The contact group to which alert notifications are sent. Alert notifications for an application group are sent to the alert contact in the alert contact group. An alert contact group is a group of alert contacts, containing one or more alert contacts. For more information about how to create an alert contact or an alert contact group, see Create an alert contact or alert contact group.	Quota Administrators of ECS Instance Types
   Alarm Callback	The URL that is accessible over the Internet to receive the alert information pushed by CloudMonitor by using HTTP POST requests. Only the HTTP protocol is supported. To test the connectivity of the callback URL, perform the following operations: Click Test next to the callback URL. On the Test Result page, you can check the connectivity of the callback URL based on the returned status code and test result details. Note You can also set the Language parameter and then click Test again to obtain test result details of the specified language. Click Close.	http://alert.aliyun.com:8080/callback
   Labels	The tags of the alert rule. A tag consists of a tag key and a tag value. You can specify up to six tags for an alert rule.	k1,v1
   Push Channel	The Alibaba Cloud service used to deliver alert information. Valid values: Simple Log Service If you turn on Simple Log Service, when an alert is generated, alert information is sent to a Logstore in Simple Log Service. In this case, you must configure the Region, ProjectName, and Logstore parameters. For information about how to create a project and a Logstore, see Getting Started. Message Service - topic If you turn on Message Service - topic, when an alert is generated, alert information is sent to a topic in Simple Message Queue (formerly MNS). In this case, you must specify a region and a topic.Simple Message Queue (formerly MNS) For more information about how to create a topic, see Create a topic. Function Compute If you turn on Function Compute, when an alert is generated, alert information is sent to Function Compute to be formatted. In this case, you must specify a region, a service, and a function. For information about how to create a service and a function, see Quickly create a function.	Turn off all switches
   Recovery Notification	Specifies whether to send notifications when alerts are cleared. The switch is turned on by default.	Turn on the switch
   Method to handle alarms when no monitoring data is found	The method that is used to handle alerts when no monitoring data is available. Valid values: Do not do anything (default) Send alarm notifications Treated as normal	Do not do anything

5. Find the quota that you want to manage and choose > Alert Settings in the Actions column.

6. In the Alerts dialog box, you can view the alert rules.

References

• Limits on ALB

• ALB quotas

• Manage ALB quotas