Appendix

Basic concepts and cloud service introduction

Elastic Cloud Server (ECS): a scalable and on-demand cloud server. It helps you to efficiently set up reliable, secure, and flexible application environments, ensuring stable service running and improving O&M efficiency.
Elastic Load Balance (ELB): automatically distributes incoming traffic across multiple servers to balance their workloads, increasing service capabilities and fault tolerance of your applications.
Elastic IP (EIP): enables your cloud resources to communicate with the Internet using static public IP addresses and scalable bandwidths. EIPs can be bound to or unbound from ECSs, BMSs, virtual IP addresses, load balancers, and NAT gateways.
Virtual Private Cloud (VPC): an isolated and private virtual network environment. You can configure IP address segments, subnets, and security groups, assign EIPs, and allocate bandwidths in a VPC.
Object Storage Service (OBS): a secure, highly reliable object storage service that allows you to inexpensively store any amount of data.
Security group: a collection of access control rules for ECSs that have the same security protection requirements and are mutually trusted in a VPC. You can define inbound and outbound rules to control traffic to and from the ECSs in a security group.
inotify-tools: a command-line tool in Linux to monitor file system changes and trigger corresponding operations.