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Updated on 2023-06-20 GMT+08:00
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HTTP/HTTPS Flow Control

Context

You can run commands in Kibana to enable or disable HTTP/HTTPS flow control for your cluster. The command parameters are as follows.

Table 1 HTTP/HTTPS flow control parameters

Parameter

Type

Description

flowcontrol.http.enabled

Boolean

Whether to enable HTTP/HTTPS flow control. This function is disabled by default. Enabling it may affect node access performance.

Value: true or false

Default value: false

flowcontrol.http.allow

List<String>

IP address whitelist.

It can contain multiple IP addresses and masks, or an IP address list. Use commas (,) to separate multiple values. Example: xx.xx.xx.xx/24,xx.xx.xx.xx/24, or xx.xx.xx.xx.xx,xx.xx.xx.

The default value is null.

flowcontrol.http.deny

List<String>

IP address blacklist.

Multiple IP addresses and masks or an IP address list can be configured. Use commas (,) to separate multiple IP addresses and masks.

The default value is null.

flowcontrol.http.concurrent

Integer

Maximum concurrent HTTP/HTTPS connections.

Default value: Number of available cores on a node x 400

flowcontrol.http.newconnect

Integer

Maximum new connections that can be created for HTTP/HTTPS requests per second.

Default value: Number of available cores on a node x 200

flowcontrol.http.warmup_period

Integer

Time required for the HTTP/HTTPS connection setup speed to reach the maximum. If flowcontrol.http.newconnect is set to 100 and flowcontrol.http.warmup_period is set to 5000ms, it indicates the system can set up 100 connections per second in 5 seconds.

Value range: 0–10000

Unit: ms

Default value: 0

Procedure

  1. Log in to the CSS management console.
  2. Choose Clusters in the navigation pane. On the Clusters page, locate the target cluster and click Access Kibana in the Operation column.
  3. In the navigation pane on the left, choose Dev Tools and run commands to enable or disable HTTP/HTTPS flow control.
    • Enabling HTTP/HTTPS flow control for a node
      PUT /_cluster/settings
{
  "persistent": {
    "flowcontrol.http.enabled": true,
    "flowcontrol.http.allow": ["192.168.0.1/24", "192.168.2.1/24"],
    "flowcontrol.http.deny": "192.168.1.1/24",
    "flowcontrol.http.concurrent": 1000,
    "flowcontrol.http.newconnect": 1000,
    "flowcontrol.http.warmup_period": 0
  }
}

      If all parameters are set to null, they will be restored to default values.

    • Disabling HTTP/HTTPS flow control for a node
      PUT /_cluster/settings
{
  "persistent": {
    "flowcontrol.http.enabled": false
  }
}
Parent topic: Flow Control