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- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Getting Started
- Creating and Accessing a Cluster
- Scaling In/Out a Cluster
- Upgrading Versions
- Importing Data to Elasticsearch
-
Managing Elasticsearch Clusters
- Cluster and Storage Capacity Statuses
- Introduction to the Cluster List
- Index Backup and Restoration
- Binding an Enterprise Project
- Restarting a Cluster
- Migrating Cluster Data
- Deleting a Cluster
- Managing Tags
- Public Network Access
- Managing Logs
- Managing Plugins
- Hot and Cold Data Storage
- Configuring Parameters
- VPC Endpoint Service
- Kibana Public Access
- Vector Retrieval
- Working with Kibana
- Elasticsearch SQL
- Connecting a Cluster to a Dedicated Load Balancer
- Enhanced Features
- Monitoring
- Auditing
- Change History
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
Cluster Management
- Creating a cluster
- Querying the Cluster List
- Querying Cluster Details
- Deleting a Cluster
- Renaming a Cluster
- Changing the Password of a Cluster
- Restarting a Cluster
- Scaling Out a Cluster
- Adding Instances and Expanding Instance Storage Capacity
- Changing Specifications
- Obtaining the Instance Specifications List
- Querying All Tags
- Querying Tags of a Specified Cluster
- Adding Tags to a Cluster
- Deleting a Cluster Tag
- Adding or Deleting Cluster Tags in Batches
- Changing the Specifications of a Specified Node Type
- Scaling In a Cluster by Removing a Specific Node
- Scaling In Nodes of a Specific Type
- Downloading a Security Certificate
- Replacing a Node
- Configuring the Security Mode.
- Adding Independent Masters and Clients
- Changing the Security Group
- Kibana Public Network Access
- Log Management
- Public Network Access
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Snapshot Management
- (Not Recommended) Automatically Setting Basic Configurations of a Cluster Snapshot
- Modifying Basic Configurations of a Cluster Snapshot
- Manually Creating a Snapshot
- Restoring a Snapshot
- Deleting a Snapshot
- Configuring the Automatic Snapshot Creation Policy
- Querying the Automatic Snapshot Creation Policy
- Querying a Snapshot List
- Disabling the Snapshot Function
- VPC Endpoint
- Parameter Configuration
- Common Parameters
- Change History
- SDK Reference
-
FAQs
- General Consulting
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Accessing CSS Clusters
- How Do I Reset the Administrator Password of a Security-mode Cluster in CSS?
- Are Ports 9200 and 9300 Open for Access to Elasticsearch Clusters?
- How Do I Use a NAT Gateway to Access CSS from the Internet?
- How Do I Connect In-house Developed Kibana to an Elasticsearch Cluster in CSS?
- How Do I Connect In-house Developed OpenSearch Dashboards to an OpenSearch Cluster in CSS?
- Migrating CSS Clusters
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Using CSS Cluster Search Engines
- Why Are Newly Created Index Shards Allocated to a Single Node in CSS?
- How Do I Create a Type Under an Index in an Elasticsearch 7.x Cluster of CSS?
- How Do I Change the Number of Replicas for Elasticsearch Indexes in CSS?
- What Are the Impacts If an Elasticsearch Cluster of CSS Has Too Many Shards?
- How Do I Check the Number of Shards and Replicas in a CSS Cluster?
- What Does the Value i for node.roles Mean for Nodes in an Elasticsearch Cluster of CSS?
- How Do I Change the Maximum Number of Results Returned for Searches to an Index in an Elasticsearch Cluster of CSS?
- How Do I Update Index Lifecycle Policies for an Elasticsearch Cluster of CSS?
- How Do I Set Slow Query Log Thresholds for an Elasticsearch Cluster of CSS?
- How Do I Clear Elasticsearch Indexes in CSS?
- How Do I Clear Elasticsearch Cache in CSS?
- Why Does the Disk Usage Increase After the delete_by_query Command Was Executed to Delete Data in an Elasticsearch Cluster?
- Do CSS Elasticsearch Clusters Support script dotProduct?
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Managing CSS Clusters
- How Do I Check the AZ Where a CSS Cluster Is Located?
- What Is the Relationship Between the Filebeat Version and Cluster Version in CSS?
- How Do I Obtain the Security Certificate of CSS?
- How Do I Convert the Format of a CER Security Certificate in CSS?
- Can I Modify the Security Group for Elasticsearch and OpenSearch Clusters in CSS?
- How Do I Set search.max_buckets for an Elasticsearch Cluster of CSS?
- Can I Modify the TLS Algorithm of an Elasticsearch or OpenSearch Cluster in CSS?
- How Do I Enable Audit Logs for an Elasticsearch or OpenSearch Cluster of CSS?
- Can I Stop a CSS Cluster?
- How Do I Query the Index Size on OBS After the Freezing of Indexes for a CSS Cluster?
- How Do I Check the List of Default Plugins for Elasticsearch and OpenSearch Clusters?
- CSS Cluster Backup and Restoration
- CSS Cluster Monitoring and O&M
- Troubleshooting
- Videos
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Context
Feature Description
CSS can control traffic at the node level. You can configure the blacklist and whitelist, the maximum concurrent HTTP connections, and the maximum HTTP connections for a node. You can also configure the maximum heap memory used by specific request paths, the maximum CPU usage, and block access in one click, and collect statistics on node access IP addresses and URIs. Each function has an independent control switch, which is disabled by default. To restore default values of parameters, set them to null.
If flow control is enabled, requests will be blocked at the entry, which relieves the cluster pressure in high-concurrency scenario and avoids unavailability issues.
- HTTP/HTTPS flow control:
- You can control client IP address access by setting IP addresses and subnets in HTTP/HTTPS blacklist or whitelist. If an IP address is in the blacklist, the client is disconnected and all its request are rejected. Whitelist rules take precedence over blacklist rules. If a client IP address exists in both the blacklist and whitelist, the client request will not be rejected.
- HTTP/HTTPS concurrent connection flow control limits the total number of HTTP connections to a node per second.
- HTTP/HTTPS new connection flow control limits the number of new connections to a node.
- Memory flow control limits request paths based on the node heap memory. You can configure memory flow control whitelist, global memory usage threshold, and heap memory threshold for a single path. Global memory flow control threshold takes precedence over the memory threshold of a single path. Paths in the whitelist will not be blocked in memory flow control.
- You can configure the global path whitelist for flow control as required when you need to use custom plug-ins.
- Request sampling can record the number of access requests from client IP addresses and the request paths of sampled users. Based on the statistics, you can identify the access traffic of client IP addresses and analyze the access traffic of request paths.
- Flow control provides an independent API for viewing traffic statistics and records the number of times the API is triggered. You can evaluate the flow control threshold and analyze the cluster load based on the statistics.
- Access logs record the URLs and bodies of HTTP/HTTPS requests received by nodes within a period of time. You can analyze the current traffic pressure based on the access logs.
- You can configure the node CPU usage threshold to limit the accessed traffic on a single node.
- One-click access blocking can block all the access traffic of a node, excluding the traffic from Kibana and Elasticsearch monitor APIs.
Constraints
- Currently, only versions 7.6.2 support the flow control feature.
- Flow control may affect the performance of some nodes.
- If flow control is enabled, user requests that exceed the flow control threshold will be rejected.
- Memory flow control and CPU flow control are based on request paths. The length and number of paths cannot be too large, or the cluster performance will be affected.
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