Nacos简介、下载与配置持久化到Mysql

深藏阁楼爱情的钟 2023-10-05 12:48 1阅读 0赞

## 场景 ##

### 什么是Nacos ###

Nacos致力于帮助您发现、配置和管理微服务。Nacos提供了一组简单易用的特性集，帮助您快速实现动态服务发  
现、服务配置、服务元数据及流且管理。  
Nacos帮助您更敏捷和容易地构建、交付和管理微服务平台。Nacos是构建以“服务’‘为中心的现代应用架构(例  
如微服务范式、云原生范式)的服务基础设施。

### Nacos全景图 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
关注公众号  
霸道的程序猿  
获取编程相关电子书、教程推送与免费下载。

## 实现 ##

Nacos官方文档：

[https://nacos.io/zh-cn/docs/quick-start.html][https_nacos.io_zh-cn_docs_quick-start.html]

Nacos下载地址：

[https://github.com/alibaba/nacos/releases][https_github.com_alibaba_nacos_releases]

选择指定的稳定版本进行下载，这里是Windows，所以选择zip包进行下载

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

下载完成在解压到磁盘某目录

### Nacos持久化 ###

防止 Nacos 宕机或重启后数据丢失,Nacos 支持将数据统一持久化到数据库 Mysql(在不配置Nacos持久化到Mysql时,

默认 Nacos 内置了一个嵌入式数据库derby,将一些数据保存到了内置的数据库上,多台 Nacos 就会出现多个内置数据库)。

连接要进行Nacos持久化的Mysql数据库，新建数据库nacos\_config

为什么叫nacos\_config这个数据库名，因为上面解压之后的Nacos中的conf目录下的nacos-mysql.sql文件中

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

其默认的数据库名就是nacos\_config

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

新建完数据库之后在此数据库中执行上面的nacos-mysql.sql文件，实现数据库的初始化。

然后再回到Nacos解压目录下的conf目录下的application.properties

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

将上面这段打开持久化Mysql的代码去掉注释，并将连接到的数据库的url和用户名密码改为自己的。

### If use MySQL as datasource:
    spring.datasource.platform=mysql
    
    ### Count of DB:
    db.num=1
    
    ### Connect URL of DB:
    db.url.0=jdbc:mysql://127.0.0.1:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC
    db.user=root
    db.password=123456

### 启动Nacos ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

这里的startup.cmd和shtudown.cmd就是在Windows下的启动好关闭命令，但是如果直接双击的话会报错。

这是因为这里Nacos没有配置集群模式，而是使用的单机模式，所以编辑startup.cmd,

将MODE修改为standalone

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 6][]

默认MODE的值是"cluster"

所以在走下面的逻辑时会走集群模式的逻辑

if %MODE% == "standalone" (
        echo "nacos is starting with standalone"
       set"NACOS_OPTS=-Dnacos.standalone=true"
        set "NACOS_JVM_OPTS=-Xms512m -Xmx512m -Xmn256m"
    )
    
    rem if nacos startup mode is cluster
    if %MODE% == "cluster" (
        echo "nacos is starting with cluster"
       if %EMBEDDED_STORAGE% == "embedded" (
           set"NACOS_OPTS=-DembeddedStorage=true"
       )
    
        set "NACOS_JVM_OPTS=-server -Xms2g -Xmx2g -Xmn1g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m -XX:-OmitStackTraceInFastThrow -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=%BASE_DIR%\logs\java_heapdump.hprof -XX:-UseLargePages"
    )

编辑之后，双击startup.cmd

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 7][]

然后打开浏览器访问

[http://localhost:8848/nacos/][http_localhost_8848_nacos]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8][]

默认用户名密码都是nacos

登录成功后

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 9][]

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[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[https_nacos.io_zh-cn_docs_quick-start.html]: https://nacos.io/zh-cn/docs/quick-start.html
[https_github.com_alibaba_nacos_releases]: https://github.com/alibaba/nacos/releases
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[http_localhost_8848_nacos]: http://localhost:8848/nacos/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8]: https://img-blog.csdnimg.cn/20201029115149721.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
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