Sentinel implements the persistence of pull pattern rules

introduction

sentinel All rules of are stored in memory by default , After restart, all rules will be lost . In production environment , We must ensure the persistence of these rules , Avoid losing .

Rule management mode

Whether rules can persist , It depends on the rule management mode ,sentinel Three rule management modes are supported ：

• Primitive mode ：Sentinel Default mode , Save rules in memory , Restarting the service will lose .
• pull Pattern
• push Pattern

pull Pattern

pull Pattern ： The console pushes the configured rules to Sentinel client , The client will save the configuration rules in a local file or database . In the future, we will regularly query local files or databases , Update local rules .

push Pattern

push Pattern ： The console pushes the configuration rules to the remote configuration center , for example Nacos.Sentinel Client listening Nacos, Get the push message of configuration change , Complete local configuration update .

Sentinel pull Pattern rule persistence

It's used here 1.8.1 , You need to change the source code yourself , I wonder whether the subsequent versions support automatic configuration

One 、 Modify service

Modify the microservice project you want to introduce , Let it listen Nacos Medium sentinel Rule configuration .

The specific steps are as follows ：

1. Introduce dependencies

stay order-service Introduction in sentinel monitor nacos Dependence ：

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>

2. To configure nacos Address

stay order-service Medium application.yml File configuration nacos Address and listening configuration information ：

spring:
  cloud:
    sentinel:
      datasource:
        flow:
          nacos:
            server-addr: localhost:8848 # nacos Address 
            dataId: orderservice-flow-rules
            groupId: SENTINEL_GROUP
            rule-type: flow #  It can also be ：degrade、authority、param-flow

Two 、 modify sentinel-dashboard Source code

SentinelDashboard Not supported by default nacos The persistence of , Need to modify the source code .

Download the source code from the official website ：

use IDEA Open the project ：

The project directory is as follows , Download dependency package （ It could take a long time , I used Alibaba cloud to give me more than ten minutes ）

2. modify nacos rely on

stay sentinel-dashboard Source code pom In file ,nacos The default dependency is scope yes test, Can only be used during testing , Here we need to remove ：

take sentinel-datasource-nacos Rely on the scope Get rid of ：

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>

3. add to nacos Support

stay sentinel-dashboard Of test It's a bag , A pair of nacos Support for , We need to copy it to main Next .

4. modify nacos Address

then , You also need to modify the... In the test code NacosConfig class ：

Modify the nacos Address , Let it read application.properties Configuration in ：

stay sentinel-dashboard Of application.properties Add nacos Address configuration ：

nacos.addr=localhost:8848

5. To configure nacos data source

in addition , It needs to be revised com.alibaba.csp.sentinel.dashboard.controller.v2 Under bag FlowControllerV2 class ：

Let's add Nacos Data source in effect ：

Modify as follows

    @Autowired
    @Qualifier("flowRuleDefaultProvider")
    private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
    @Autowired
    @Qualifier("flowRuleDefaultPublisher")
    private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

    @Autowired
    @Qualifier("flowRuleNacosProvider")
    private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
    @Autowired
    @Qualifier("flowRuleNacosPublisher")
    private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

6. Modify the front page

Next , Also modify the front page , Add a support nacos Menu for .

modify src/main/webapp/resources/app/scripts/directives/sidebar/ In the catalog sidebar.html file ：

Open this part of the comment ：

Modify the text ：

7. recompile 、 Packaging project

function IDEA Medium maven plug-in unit , Compile and package the modified Sentinel-Dashboard：

8. start-up

The start-up method is the same as the official ：

java -jar sentinel-dashboard.jar

If you want to modify nacos Address , Need to add parameters ：

java -jar -Dnacos.addr=localhost:8848 sentinel-dashboard.jar