QOS Overview

The new version of dubbo 2.5.8 adds QOS module and provides new telnet command support.

QoS provides some startup parameters to configure startup, they mainly include:

Parameters	Description	Default
qos-enable	Whether to enable QoS	true
qos-port	Enable QoS binding port	22222
qos-accept-foreign-ip	Whether to allow remote access	false
qos-accept-foreign-ip-whitelist	Supported remote host ip address (segment)	(none)
qos-anonymous-access-permission-level	Permission level for anonymous access supported	PUBLIC(1)

Note, starting from 2.6.4/2.7.0, the default configuration of qos-accept-foreign-ip is changed to false. If qos-accept-foreign-ip is set to true, it may bring security risks, please evaluate carefully Open.

QoS parameter configuration

system properties
dubbo.properties
XML method
Spring-boot automatic assembly method

Among them, the priority order of the above methods is system properties > dubbo.properties > XML/Spring-boot automatic assembly method.

port

The port of the new version of telnet is different from the port of the dubbo protocol, the default is 22222

It can be modified through the configuration file dubbo.properties:

dubbo.application.qos-port=33333

or You can set the JVM parameter:

-Ddubbo.application.qos-port=33333

Safety

By default, dubbo accepts commands initiated by any host

It can be modified through the configuration file dubbo.properties:

dubbo.application.qos-accept-foreign-ip=false

You can set the JVM parameter:

-Ddubbo.application.qos-accept-foreign-ip=false

Reject commands issued by the remote host, and only allow the service to execute locally.

At the same time, you can specify the supported remote host ip addresses (segments) by setting qos-accept-foreign-ip-whitelist, and separate multiple ip addresses (segments) with comma, such as:

Configuration file dubbo.properties

dubbo.application.qos-accept-foreign-ip-whitelist=123.12.10.13, 132.12.10.13/24

Set JVM parameters:

-Ddubbo.application.qos-accept-foreign-ip-whitelist=123.12.10.13,132.12.10.13/24

Permissions

In order to support the life cycle probe by default, QoS provides the ability to access anonymously and set the permission level. The currently supported permission levels are:

PUBLIC(1) By default, the command permission level of anonymous access is supported. Currently, only commands related to lifecycle probes are supported.
PROTECTED(2) command default privilege level
PRIVATE(3) The highest privilege level reserved, currently unsupported
NONE The lowest privilege level, i.e. anonymous access is not supported

Privilege level PRIVATE> PROTECTED> PUBLIC> NONE, high-level permissions can access commands of the same level and low-level permissions. Currently the permissions of the following commands are PUBLIC, and the default permissions of other commands are PROTECTED.

command	privilege level
Live	PUBLIC (1)
Startup	PUBLIC (1)
Ready	PUBLIC (1)
Quit	PUBLIC (1)

By default, dubbo allows anonymous hosts to initiate anonymous access, only commands with PUBLIC permission level can be executed, and other commands with higher permissions will be rejected.

Turn off anonymous access Anonymous access can be turned off by setting qos-anonymous-access-permission-level=NONE.

SET PERMISSION LEVEL It can be modified through the configuration file dubbo.properties:

dubbo.application.qos-anonymous-access-permission-level=PROTECTED

or
You can set the JVM parameter:

-Ddubbo.application.qos-anonymous-access-permission-level=PROTECTED

to allow anonymous access to higher-level privileged commands.

agreement

telnet and http protocols

The telnet module now supports both the http protocol and the telnet protocol, which is convenient for use in various situations Example:

➜ ~ telnet localhost 22222
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
  ████████▄ ███ █▄ ▀█████████▄ ▀█████████▄ ▄██████▄
  ███ ▀███ ███ ███ ███ ███ ███ ███ ███ ███
  ███ ███ ███ ███ ███ ███ ███ ███ ███ ███
  ███ ███ ███ ███ ▄███▄▄▄██▀ ▄███▄▄▄██▀ ███ ███
  ███ ███ ███ ███ ▀▀███▀▀▀██▄ ▀▀███▀▀▀██▄ ███ ███
  ███ ███ ███ ███ ███ ██▄ ███ ██▄ ███ ███
  ███ ▄███ ███ ███ ███ ███ ███ ███ ███ ███
  ████████▀ ████████▀ ▄█████████▀ ▄█████████▀ ▀██████▀


dubbo>ls
As Provider side:
+----------------------------------+---+
| Provider Service Name |PUB|
+----------------------------------+---+
|org.apache.dubbo.demo.DemoService|N|
+----------------------------------+---+
As Consumer side:
+---------------------+---+
|Consumer Service Name|NUM|
+---------------------+---+

dubbo>

➜ ~ curl "localhost:22222/ls?arg1=xxx&arg2=xxxx"
As Provider side:
+----------------------------------+---+
| Provider Service Name |PUB|
+----------------------------------+---+
|org.apache.dubbo.demo.DemoService|N|
+----------------------------------+---+
As Consumer side:
+---------------------+---+
|Consumer Service Name|NUM|
+---------------------+---+

Use configuration

Use system properties to configure

-Ddubbo.application.qos-enable=true
-Ddubbo.application.qos-port=33333
-Ddubbo.application.qos-accept-foreign-ip=false
-Ddubbo.application.qos-accept-foreign-ip-whitelist=123.12.10.13,132.12.10.13/24
-Ddubbo.application.qos-anonymous-access-permission-level=PUBLIC

Use dubbo.properties file configuration

Add the dubbo.properties file in the src/main/resources directory of the project, the content is as follows:

dubbo.application.qos-enable=true
dubbo.application.qos-port=33333
dubbo.application.qos-accept-foreign-ip=false
dubbo.application.qos-accept-foreign-ip-whitelist=123.12.10.13, 132.12.10.13/24
dubbo.application.qos-anonymous-access-permission-level=PUBLIC

Use the XML method to configure

If you want to configure the QoS-related parameters of the response through XML, you can configure them as follows:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
  <dubbo:application name="demo-provider">
    <dubbo:parameter key="qos-enable" value="true"/>
    <dubbo:parameter key="qos-accept-foreign-ip" value="false"/>
    <dubbo:parameter key="qos-accept-foreign-ip-whitelist" value="123.12.10.13,132.12.10.13/24"/>
    <dubbo:parameter key="qos-anonymous-access-permission-level" value="NONE"/>
    <dubbo:parameter key="qos-port" value="33333"/>
  </dubbo:application>
  <dubbo:registry address="multicast://224.5.6.7:1234"/>
  <dubbo:protocol name="dubbo" port="20880"/>
  <dubbo:service interface="org.apache.dubbo.demo.provider.DemoService" ref="demoService"/>
  <bean id="demoService" class="org.apache.dubbo.demo.provider.DemoServiceImpl"/>
</beans>

Use spring-boot automatic assembly configuration

If it is a spring-boot application, it can be configured on application.properties or application.yml:

dubbo.application.qos-enable=true
dubbo.application.qos-port=33333
dubbo.application.qos-accept-foreign-ip=false
dubbo.application.qos-accept-foreign-ip-whitelist=123.12.10.13, 132.12.10.13/24
dubbo.application.qos-anonymous-access-permission-level=NONE

Last modified January 2, 2023: Enhance en docs (#1798) (95a9f4f6c1c)