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- Function Overview
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- Getting Started
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User Guide
- Getting Started with MAS
- Modules
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- Multi-Active Instances
- Application Management
- Monitor Management
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FAQs
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MAS FAQs
- Is MAS a Product or Solution?
- Does MAS Synchronize Data in Addition to Controlling Access from Applications to Databases?
- Is MAS Like a Management Channel for Which I Need to Configure Automatic Switchover Policies?
- What Is the Automatic Switchover Mechanism? How Does MAS Implement Switchovers in Seconds?
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Multi-Active DR Solution FAQs
- In the Single- or Dual-Instance Data Layer Architecture (Same Region, Multi-AZ, Traffic Distribution with API Gateway), Which Components Are Provided by MAS and Which Ones Should I Prepare?
- Can I Implement the Active-Active Solution on Any Other Services in Addition to Self-Built Cloud Services?
- How Do I Implement Database Dual-Write?
- Does the Multi-Active Architecture Have Any Requirements on My Services?
- What Are the RPO and RTO of the Multi-Active DR Solution?
- Does the Multi-Active DR Solution Have Any Network Requirements? Will Incorrect Switchover Occur If the Network is Unstable or Jitters?
- How Do I Configure Monitoring for Multi-AZ Deployment in the Same Region?
- Will MAS and API Gateway Be Deployed on Both Huawei Cloud and Our Cloud?
- MAS Usage FAQs
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MAS FAQs
- General Reference
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DDM Monitoring
Introduction
A DDM monitor detects your database status, and automatically triggers traffic switching when the database is abnormal.
Creating a DDM Monitor
- Log in to the MAS console. On the Multi-Active Instances page, click an instance whose namespace type is Intra-city multi-active.
- Click the Monitor List tab, and click Create Monitor.
- Configure the basic information, then click Next: Data Centers.
Figure 1 Basic information configurations
Table 1 Basic information parameters Parameter
Description
Monitor
Select DDM Monitoring.
Application
Select the application.
Monitor Name
Customize the monitor name.
Exception Notification
By default, this option is disabled.
If it is enabled,
- Monitor and database exceptions will be sent to you in a timely manner. To enable this option, configure a secret key first.
- Cloud Eye is enabled by default. Ensure that the alarm rules for MAS have been created on the Cloud Eye console. For details, see Creating an Alarm Rule to Monitor an Event.
Monitoring
The default value is Yes. If No, database exceptions will not be monitored.
Automatic Switchover
The default value is Yes. If No, automatic switchover of the databases will not be triggered.
Username
Enter the username for logging in to the database.
Password
Enter the password for logging in to the database.
- Configure the data centers, then click Next: Databases.
Figure 2 Data center configurations
Table 2 Data center parameters Parameter
Description
Cloud
The environment where the monitored database is deployed
Region
The region where the monitored database is located
Connection Address
The IP address and port number for accessing the DDM database
- Configure the databases, then click Next: Advanced.
Figure 3 Database configurations
Table 3 Database parameters Parameter
Description
Monitored Database
Enter the monitored database name.
Connected Database
Enter the connected database name.
CAUTION:The names of the Monitored Database and Connected Database should be the same, and the specified database must exist in the monitored data source.
- Configure the advanced settings, then click Next: Confirm.
Figure 4 Advanced configurations
Table 4 Advanced settings Parameter
Description
Retry Interval (ms)
The interval of reconnection attempts, in milliseconds. Default value (recommended): 3000
Value range: 1 to 300,000
Monitoring Timeout (ms)
The timeout duration before a monitor becomes abnormal, in milliseconds.
Default value (recommended): 40,000; Value range: 1 to 600,000
NOTE:Ensure that the time you specify here is longer than the time required for data center 1 to synchronize data to data center 2. Otherwise, the data in data center 2 may be incomplete.
Database Access Timeout (ms)
The database access timeout duration, over which the database access is considered failed, in milliseconds. Default value (recommended): 3000
Value range: 3000 to 100,000
- Confirm settings and click Create.
NOTE:
If the created monitor is not normal, that is, its indicator is not green, its configurations or databases may be abnormal. In this case, rectify the fault.
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