Overview

1: ServiceWatch metric

Service Overview

The Load Balancer (LB) service of Samsung Cloud Platform automatically distributes traffic to available servers when there is an unpredictable traffic surge or server failure, ensuring the stability and continuity of customer services.

A Load Balancer serves as the service endpoint provided to clients, is deployed in a VPC subnet according to the service type (L4 / L7), and you can configure multiple services by adding listeners to the created Load Balancer.

The Listener receives client requests through the service port and processes traffic according to routing rules. L4 supports TCP / UDP / TLS protocols, and L7 supports HTTP / HTTPS protocols; in L7, you can specify an LB server group for each routing condition or set a redirect response for the request URL.

The LB server group forwards requests received by the Listener to specific servers based on load balancing and health checks. The servers receive client requests from the Load Balancer’s Source NAT IP through the ports configured for the members, and the server status is periodically monitored by the Load Balancer’s health check IP.

LB health check defines the member health check method registered in the LB server group. You can select a default LB health check resource provided for the LB server group, or create a new one to configure monitoring suitable for the application.

Features

Various load balancing methods: Round Robin, Least Connection, IP Hash, etc., are provided.
SSL Authentication Encryption and Offloading: Supports SSL offloading and allows selection of encryption level.
Enhanced Security: Use a firewall to manage Load Balancer communication and view connection logs by storing logs.

Service Architecture Diagram

Provided features

Load Balancer: Select the service type and configure the IP to be used by the Load Balancer.
Listener: Set the protocol, port, and routing rules. You can add multiple Listeners to a single Load Balancer.
LB server group: Sets the load balancing method. LB server group can be attached to a single Load Balancer.
Member: Select the server to add to the LB server group. You can choose Virtual Server or Bare Metal Server resources created in the same VPC as the Load Balancer, or enter an IP address directly.
LB health check: Sets the member health check method. LB health checks can be registered and used across multiple LB server groups.

Component

A Load Balancer consists of a Load Balancer (Listener), LB server group (member), and LB health check.

Load Balancer

The components that make up a Load Balancer are as follows. By configuring each component, you can set up load balancing suitable for the customer’s workload.

Component	Detailed description
Service Category	Load Balancer service type Classification of Listener protocols that can be created according to L4 / L7
Service Sunbet	Assign the Service IP, Source NAT IP, and Health Check IP required for the Load Balancer in the Subnet range of the VPC Subnet Subnet
Service IP	Service IP that the client accesses
Source NAT IP	IP used to forward server traffic in the Load Balancer
Health check IP	IP used for health checks in the Load Balancer
Listener	Resources connected to the Load Balancer protocol, port, LB server group settings

Table. Load Balancer components

LB server group

The elements that make up an LB server group are as follows. Traffic is delivered to members of the LB server group according to the settings of each component.

Component	Detailed description
Protocol	LB server group forwarding protocol
Load balancing	Traffic distribution method Deliver traffic to a specific member according to the load balancing method
LB health check	Member health check method LB Select from the list of resources created by the health check
Member	Server that processes client requests Set weights or modify activation status based on load balancing

Table. LB server group components

LB health check

The elements that make up the LB health check are as follows. Member health checks are performed according to the settings of each component.

Component	Detailed description
Protocol	Health check protocol
Health check port	Port used for health check
Period	Health check execution interval
Waiting time	Server response latency for health check
Detection count	Criteria for determining member health check status (Healthy / Unhealthy)

Table. LB health check components

Constraints

The Load Balancer of Samsung Cloud Platform has a default quota, which limits the number of Load Balancers, Listeners, LB server groups, and members that can be created. You can manage current usage through the Console and request additional quota for items that can be expanded.

Item	Default quota	Detailed description
LOAD_BALANCER.SERVICE_SUBNET.DEFAULT.COUNT	3	Number of Service Subnets per VPC that can create a Load Balancer
LOAD_BALANCER.DEFAULT.COUNT	50	Number of Load Balancers created per Region
LOAD_BALANCER.LISTENER.DEFAULT.COUNT	1000	Number of Listeners created per Region
LOAD_BALANCER.SERVER_GROUP.DEFAULT.COUNT	1000	Number of LB server groups created per region
LOAD_BALANCER.MEMBER.DEFAULT.COUNT	1000	Number of members that can be registered to the entire LB server group per region
LOAD_BALANCER.HEALTH_CHECK.DEFAULT.COUNT	500	Number of LB health checks created per region

Table. Load Balancer Constraints

Preliminary Service

This is a list of services that must be pre-configured before creating a Load Balancer service. Please refer to the guide provided for each service and prepare in advance.

Service Category	Service	Detailed description
Networking	VPC	A service that provides an isolated virtual network in a cloud environment

Table. Load Balancer prerequisite service

1 - ServiceWatch metric

The Load Balancer sends metrics to ServiceWatch. The metrics provided by basic monitoring are data collected at 5‑minute intervals.

Reference

Refer to the ServiceWatch guide for how to view metrics in ServiceWatch.

Basic Metrics

The following are the default metrics for the Load Balancer namespace.

The indicators whose names are displayed in bold text below are the key metrics selected from the basic metrics provided by Load Balancer. Key metrics are used to build the service dashboards that are automatically created for each service in ServiceWatch.

Each metric provides guidance in the user guide on which statistical values are meaningful when querying that metric, and among the meaningful statistics, the values shown in bold are the primary statistics. In the service dashboard, you can view key metrics using primary statistical values.

Performance items	Detailed description	unit	meaningful statistics
LB Status	Load Balancer status	-	-
LB Total Connections	LB cumulative connection count	Count	total
LB Total L4 Connections	Cumulative L4 connection count	Count	total
LB Total L7 Connections	Cumulative L7 connection count	Count	Total
LB Total SSL Connections	Cumulative SSL connection count	Count	Total
LB Total TCP Connections	Cumulative TCP connection count	Count	Total
LB Current Connections	Current number of active connections	Count	Total
LB Current SSL Connections	Current SSL connection count	Count	Total
LB Peak Connections	LB maximum connections	Count	Total
LB Total Requests	LB cumulative request count	Count	Total
LB Current Requests	LB current request count	Count	Total
LB Connection Rate (CPS)	Number of new inbound connections	Count	Total
LB Forward Bytes	Cumulative bytes transferred from the LB to the server	Bytes	total
LB Forward Bytes (Delta)	Cumulative bytes (Delta) delivered from LB to server	Bytes	Total
LB Forward Packets	Cumulative packets delivered from the LB to the server	Count	Total
LB Forward Packets (Delta)	Cumulative packets (Delta) delivered from the LB to the server	Count	Total
LB Reverse Bytes	Cumulative packets delivered from LB to the server	Bytes	Total
LB Reverse Bytes (Delta)	Cumulative bytes (Delta) received from the server	Bytes	Total
LB Reverse Packets	Cumulative packets received from the server	Count	Total
LB Reverse Packets (Delta)	Cumulative packets (Delta) received from the server	Count	Total
LB Current Responses	LB current response count	Count	total
LB Total Success Responses	Cumulative successful response count	Count	Total
LB Last Response Time	LB last response time	Milliseconds	Total
LB Fastest Response Time	LB shortest response time	Milliseconds	Total
LB Slowest Response Time	LB maximum response time	Milliseconds	Total
LB Total Failure Actions	Number of failures handled in LB	Count	Total
Listener Status	Listener status	Count	total
Listener Total Connections	Listener cumulative connection count	Count	Total
Listener Total L4 Connections	Cumulative L4 connection count	Count	Total
Listener Total L7 Connections	Cumulative L7 connection count	Count	Total
Listener Total SSL Connections	Cumulative SSL connection count	Count	total
Listener Total TCP Connections	Cumulative TCP connection count	Count	Total
Listener Current Connections	Current number of active connections	Count	Total
Listener Current SSL Connections	Current SSL connection count	Count	Total
Listener Peak Connections	Maximum number of connections for the listener	Count	Total
Listener Current Requests	Listener current request count	Count	Total
Listener Total Requests	Listener cumulative request count	Count	Total
Listener Connection Rate (CPS)	Number of new inbound connections	Count	Total
Listener Forward Bytes	Cumulative bytes transferred from the Listener to the server	Bytes	Total
Listener Forward Bytes (Delta)	Cumulative bytes (Delta) transmitted from the Listener to the server	Bytes	Total
Listener Forward Packets	Cumulative packets transmitted from the Listener to the server	Count	Total
Listener Forward Packets (Delta)	Cumulative packets (Delta) transmitted from the Listener to the server	Count	Total
Listener Reverse Bytes	Cumulative bytes received from the server	Bytes	Total
Listener Reverse Bytes (Delta)	Cumulative bytes (Delta) received from the server	Bytes	Total
Listener Reverse Packets	Cumulative packets received from the server	Count	Total
Listener Reverse Packets (Delta)	Cumulative packets (Delta) received from the server	Count	Total
Listener Current Responses	Listener current response count	Count	total
Listener Total Success Responses	Cumulative successful response count	Count	Total
Listener Last Response Time	Listener last response time	Milliseconds	Total
Listener Fastest Response Time	Listener minimum response time	Milliseconds	Total
Listener Slowest Response Time	Listener maximum response time	Milliseconds	Total
Listener Total Failure Actions	Number of failures processed in the Listener	Count	total
ServerGroup Status	LB server group status	Count	Total
ServerGroup Request Count	Cumulative request count for LB server group	Count	Total
ServerGroup Response Count	LB server group cumulative response count	Count	Total
ServerGroup 2xx Response Count	Number of HTTP 2xx responses	Count	Total
ServerGroup 3xx Response Count	Number of HTTP 3xx responses	Count	Total
ServerGroup 4xx Response Count	Number of HTTP 4xx responses	Count	Total
ServerGroup 5xx Response Count	Number of HTTP 5xx responses	Count	Total
ServerGroup Healthy Member Count	Number of healthy members	Count	Total
ServerGroup Unhealthy Member Count	Health check abnormal member count	Count	Total
ServerGroup Peak Connections	Maximum connections for LB server group	Count	Total

Table. Load Balancer basic metrics