Document Center
Server Load Balancer
Announcements and Updates
Release notes
Announcement (20210301): Name change in SLB
Announcement (20210113): Optimization of the cloud monitoring feature
Announcement (20200401): Billing of high-performance SLB instances of the smallest size
Announcement (20201127): Retirement of internal-facing CLB instances deployed in a classic network
SLB overview
Application Load Balancer
ALB Product Introduction
What is ALB?
Features and limits of different editions
Supported regions and zones
Quick start
ALB billing
ALB billable items
ALB service plans
Introduction to ALB service plans
Purchase an ALB resource plan
ALB User Guide
Instance
Create an ALB instance
View details of an ALB instance
Manage ALB instances
Modify the configurations of an ALB instance
Listeners
Add an HTTP listener
Add an HTTPS listener
Add a QUIC listener
Manage forwarding rules
FAQ about WebSocket and WebSocket Secure
Server Groups
Server groups
Manage server groups
Add backend servers by specifying their ENIs
Safety Management
Access control
Health checks
Manage certificates
TLS security policies
Logs and monitoring
Access logs
Configure a CNAME record
ALB Developor Guide
API Reference
List of operations by function
Service-linked roles for ALB
HTTP Requests
Overview
Request syntax
Common parameters
Signature method
Result
Obtain an AccessKey pair
Region and zone management
DescribeRegions
DescribeZones
Server Load Balancer (SLB) instances
CreateLoadBalancer
DeleteLoadBalancer
DisableDeletionProtection
EnableDeletionProtection
GetLoadBalancerAttribute
ListLoadBalancers
UpdateLoadBalancerAttribute
UpdateLoadBalancerEdition
Listener management
CreateListener
DeleteListener
GetListenerAttribute
ListListeners
StartListener
StopListener
UpdateListenerAttribute
UpdateListenerLogConfig
Forwarding rule management
CreateRule
CreateRules
DeleteRule
DeleteRules
ListRules
UpdateRuleAttribute
Health check management
CreateHealthCheckTemplate
DeleteHealthCheckTemplates
ListHealthCheckTemplates
UpdateHealthCheckTemplateAttribute
Tag management
ListTagKeys
ListTagValues
ListTagResources
TagResources
UnTagResources
Server certificate management
AssociateAdditionalCertificatesWithListener
DissociateAdditionalCertificatesFromListener
ListListenerCertificates
Security policy management
CreateSecurityPolicy
ListSystemSecurityPolicies
ListSecurityPolicies
UpdateSecurityPolicyAttribute
DeleteSecurityPolicy
ListSecurityPolicyRelations
Access control
CreateAcl
UpdateAclAttribute
AddEntriesToAcl
RemoveEntriesFromAcl
ListAclEntries
ListAcls
ListAclRelations
DeleteAcl
AssociateAclsWithListener
DissociateAclsFromListener
Access logs
EnableLoadBalancerAccessLog
DisableLoadBalancerAccessLog
Server groups
CreateServerGroup
DeleteServerGroup
UpdateServerGroupAttribute
ListServerGroups
ListServerGroupServers
AddServersToServerGroup
RemoveServersFromServerGroup
UpdateServerGroupServersAttribute
Resource groups
MoveResourceGroup
SDK Reference
Download SDKs
Classic Load Balancer
Product Introduction
What is CLB?
High availability
Architecture
Features
Scenarios
Terms
Regions and zones that support CLB
Quick Start (New Console)
Overview
Make preparations
Create a CLB instance
Configure a CLB instance
Use an A record to resolve a domain name to an IP address
Release an SLB instance
CLB Pricing
Overdue payments
Monitoring data and billing data
CLB billing FAQ
Pay-as-you-go
User Guide
Instance
Overview
Network traffic flow
Overview of IPv6 CLB instances
Create a CLB instance
Start or stop an instance
Associate an EIP with an SLB instance
Tags
Tag overview
Add tags
Query CLB instances by tag
Remove a tag
Enable deletion protection
Release an SLB instance
Expired instances
Manage idle instances
FAQ
FAQ about CLB instances
FAQ about high-performance CLB instances
Listeners
Listener overview
Add a TCP listener
Add a UDP listener
Add an HTTP listener
Add an HTTPS listener
Domain name extensions
Overview
Add an additional certificate
Edit an additional certificate
Delete an additional certificate
Manage TLS security policies
Redirect HTTP requests to HTTPS
FAQ
FAQ about CLB
FAQ about Layer 7 listeners that use HTTPS or HTTP
Backend servers
Backend server overview
Default server groups
Add a default backend server
Change the weight of a backend server
Remove a backend server
VServer groups
Create a vServer group
Modify a VServer group
Delete a VServer group
Active/standby server groups
Create a primary/secondary server group
Delete a primary/secondary server group
Add backend servers by specifying their ENIs
Backend server FAQ
Health check
Health check overview
Configure health checks
Execute a health check script
Disable the health check feature
Health check FAQ
Certificate management
Certificate requirements
Create a certificate
Certificate overview
Use a certificate from Alibaba Cloud SSL Certificates Service
Upload a third-party certificate
Generate a CA certificate
Convert the certificate format
Replace a certificate
Replace multiple certificates at a time
Access control
Overview
Access control lists
Create an access control list
Add IP entries
Delete IP entries
Enable access control
Disable access control
Migrate to the new access control
Limits
Limits
Bandwidth limits
Manage quotas
Common Configurations
Implement cross-region load balancing by using Global Traffic Manager
Bandwidth limits in different regions
API Inspector
FAQ about WebSocket and WebSocket Secure
Anti-DDoS Origin (Basic Edition)
Monitoring
Monitoring and alerting metrics
Monitoring
View monitoring data in the console
View monitoring data by calling API operations
View monitoring data through the SDK
Configure fine-grained monitoring
Alerting
Set alert rules in the CloudMonitor console
Set alert rules by calling the Cloud Monitor API
Set alert rules by using Cloud Monitor SDKs
Log management
View operation logs
Health check logs
Download health check logs
Store health check logs
View health check logs
Access logs
Overview of the access log feature
Configure access logging
Authorize a RAM user to use the access logs feature
CLB Developer Guide
Developer Guide
List of operations by function
Service-linked roles for CLB
HTTP Requests
Overview
Request syntax
Result
Common parameters
Request signatures
Obtain an AccessKey pair
RAM authorization
Server Load Balancer (SLB) instances
CreateLoadBalancer
DeleteLoadBalancer
ModifyLoadBalancerInstanceSpec
DescribeZones
DescribeRegions
DescribeLoadBalancerAttribute
DescribeLoadBalancers
SetLoadBalancerName
SetLoadBalancerStatus
ModifyLoadBalancerInternetSpec
SetLoadBalancerDeleteProtection
SetLoadBalancerModificationProtection
UDP listeners
CreateLoadBalancerUDPListener
SetLoadBalancerUDPListenerAttribute
DescribeLoadBalancerUDPListenerAttribute
TCP listeners
CreateLoadBalancerTCPListener
SetLoadBalancerTCPListenerAttribute
DescribeLoadBalancerTCPListenerAttribute
HTTP listeners
CreateLoadBalancerHTTPListener
SetLoadBalancerHTTPListenerAttribute
DescribeLoadBalancerHTTPListenerAttribute
HTTPS listeners
CreateLoadBalancerHTTPSListener
SetLoadBalancerHTTPSListenerAttribute
DescribeLoadBalancerHTTPSListenerAttribute
Listeners
StartLoadBalancerListener
StopLoadBalancerListener
DeleteLoadBalancerListener
DescribeLoadBalancerListeners
Default server group
AddBackendServers
RemoveBackendServers
SetBackendServers
DescribeHealthStatus
vServer groups
CreateVServerGroup
SetVServerGroupAttribute
AddVServerGroupBackendServers
RemoveVServerGroupBackendServers
ModifyVServerGroupBackendServers
DeleteVServerGroup
DescribeVServerGroups
DescribeVServerGroupAttribute
Active/standby server groups
DescribeMasterSlaveServerGroups
DescribeMasterSlaveServerGroupAttribute
CreateMasterSlaveServerGroup
DeleteMasterSlaveServerGroup
Server certificates
UploadServerCertificate
DeleteServerCertificate
DescribeServerCertificates
SetServerCertificateName
UploadCACertificate
DeleteCACertificate
DescribeCACertificates
SetCACertificateName
TLS policies
CreateTLSCipherPolicy
DeleteTLSCipherPolicy
ListTLSCipherPolicies
SetTLSCipherPolicyAttribute
Domain name extensions (Beta)
DescribeDomainExtensionAttribute
CreateDomainExtension
SetDomainExtensionAttribute
DescribeDomainExtensions
DeleteDomainExtension
Quota query
DescribeAvailableResource
Tags
ListTagResources
UntagResources
TagResources
Forwarding rules
CreateRules
DeleteRules
SetRule
DescribeRuleAttribute
DescribeRules
Access control
CreateAccessControlList
DeleteAccessControlList
DescribeAccessControlLists
DescribeAccessControlListAttribute
SetAccessControlListAttribute
AddAccessControlListEntry
RemoveAccessControlListEntry
Access control (earlier version)
DescribeListenerAccessControlAttribute
AddListenerWhiteListItem
RemoveListenerWhiteListItem
SetListenerAccessControlStatus
Common error codes
SDK Guide
Download SDKs
Alibaba Cloud SDK for Python code examples
Install Alibaba Cloud SDK for Python
Preparations
Create an SLB instance and then delete the SLB instance
Upgrade multiple CLB instances at a time
Create a TCP listener
Update SSL certificates
View monitoring information
Clone an SLB instance
FAQ & Troubleshooting
Tutorials
ALB
Configure HTTPS to encrypt communication
Add multiple domain names for an NGINX service to serve HTTPS requests
Redirect HTTP requests to an HTTPS listener
Use traffic mirroring to simulate service traffic
Use ALB to implement canary release
Use QUIC to accelerate the delivery of video and audio content
Customize TLS policies to improve website security
CLB
Configure an HTTPS listener for one-way authentication
Configure an HTTPS listener (mutual authentication)
Redirect HTTP requests to HTTPS
Configure a CLB instance to serve multiple domain names over HTTPS
Forward requests based on domain names or URLs
Forward requests from the same domain name but different URLs
Preserve client IP addresses when Layer 7 listeners are used
Use CLB in Auto Scaling
Enable Proxy Protocol for a Layer 4 listener to retrieve client IP addresses
Perform a stress test
Use access logs to find unhealthy backend servers
Specify an IP address for an SLB instance by using OpenAPI Explorer
View traffic usage
FAQ
Why am I unable to access an SLB instance?
Why are requests unbalanced among ECS instances?
What can I do if health checks generate an excessive number of logs?
What can I do if my ECS instance is declared unhealthy after I enable health checks for Server Load Balancer?
How do I troubleshoot health check exceptions of a layer-4 (TCP/UDP) listener?
How do I troubleshoot a health check exception of a Layer 7 listener (HTTP/HTTPS)?
How do I troubleshoot HTTP 5xx errors?
Configure cookie in the backend server
Session persistence FAQ
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