1. VPC
eSurfing Cloud Virtual Private Cloud (VPC) is a custom private network created based on the eSurfing Cloud, ensuring complete logical isolation between different VPCs. Within a VPC, you can create and manage cloud product instances such as cloud servers, cloud databases, and load balancers.
2. Private Network CIDR Block
When creating a VPC, you need to specify the private network CIDR block to be used in CIDR address block format.
You can use standard private network CIDR blocks and their subnets from the table below as the private network CIDR block for your VPC.
Network Segment | Description |
10.0.0.0/8-24 | Available private IP addresses (excluding system reserved addresses): 16,777,216 |
172.16.0.0/12-24 | Available private IP addresses (excluding system reserved addresses): 1,048,576 |
192.168.0.0/16-24 | Available private IP addresses (excluding system reserved addresses): 65,536 |
3. ELB
eSurfing Cloud Server Load Balancer (ELB) virtualizes added ECS instances into a high-performance, highly available application service pool by setting a virtual service address. It distributes client requests to ECS instances in the cloud server pool based on forwarding rules.
ELB automatically checks the health status of ECS instances in the cloud server pool, isolates ECS instances with abnormal statuses, eliminating single points of failures of individual ECS instances and enhancing the overall service capacity of applications.
ELB consists of the following three components:
Load Balancer Instance: A load balancer instance is an active load balancing service that receives traffic and distributes it to back-end servers. To use the ELB service, you must create a load balancer instance and add at least one listener and two ECS instances.
Listener: A listener checks client requests and forwards them to the back-end servers. A listener also performs health checks on the back-end servers.
Back-end Server: A group of ECS instances that receive requests from the front end.