Instructions on Multi Availability Zone High Availability Config

CLB Multi Availability Zone High Availability

CLB supports multi-availability zone disaster recovery capabilities for IPv4 private and public networks and EIPs. For example, in SZ Zone 1 and Financial District Two availability zones (within the same region), multiple clusters will be deployed separately to achieve cross-availability zone disaster recovery within the same region. This feature ensures that when an entire availability zone fails, the CLB can switch frontend access traffic to another availability zone within the same region within 10 seconds to restore service capability.

Specific Cases and Questions

Question 1: There are CLB test1 in SZ Financial District A and B. What is the policy for client public network inbound traffic?

In the IDCs of SZ District 1 and District 2, there is a pair of IP resource pools, which can be understood as equal IP resources. Developers do not need to understand which of zone 1 and zone 2 is the primary cluster and which is the replica cluster. The two clusters have the same load capacity. When developers purchase a CLB and bind it to a CVM, two sets of rules are generated and written into two clusters, and high availability is now achieved.

Question 2: There are CLBs test1 in SZ Financial District A and B, and the backend is bound to 100 servers in each availability zone A and B. During business operations, 1 million HTTP persistent connections are established (TCP connections are not closed). At this time, when the CLB cluster of Financial District A is completely paralyzed and unavailable, how do the businesses look like?

When the CLB in Financial District A loses its service capability, all current persistent connections are disconnected, but non-persistent connections are not affected. The disaster recovery architecture will automatically bind all 100 servers in zones A/B to the lCLB in financial zone B within 10 seconds, and business capabilities will be restored immediately without manual intervention.

Question 3: What types of CLBs are supported by the multi-availability zone disaster recovery capability?

IPv4 private and public network CLB and EIP support Cross-AZ Disaster Recovery.