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Column introduction

【 Microservices 】 At present, it mainly updates micro services , Learn together and progress together .

Introduction to this issue

This issue focuses on Nacos Data persistence and cluster building

List of articles

Data persistence

Initialize database

Turn on mysql Storage

test

Nacos Cluster building

summary

Configuration steps

Configuration details

Common mistakes

Data persistence

• In stand-alone mode nacos Using embedded database to realize data storage ,0.7 Added after the version mysql Store the data .

Initialize database

• stay conf Under the table of contents , Provides nacos-mysql.sql SQL sentence , Initialize the database

  • requirement ：5.6+ mysql

  • Be careful ： If you use mysql 5.5, Need modification sql sentence

• Provided SQL Statement not created database, Manually create nacos_config  

Turn on mysql Storage

• conf Under the table of contents , Provides application.properties You can modify the database configuration information

### 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_2_1?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC
db.user.0=root
db.password.0=1234

test

• Add configuration information

• Check the database storage  

Nacos Cluster building

summary

• 3 Or 3 More than Nacos Only nodes can form a cluster

• Configure data sources

  • Use built-in data sources

startup.cmd -p embedded

• • Use external data sources （MySQL, Reference resources 4.4.2）

• Configure port numbers of multiple nodes on one host == Can't be continuous ==.

  • for example ：8841/8842/8843 Unavailable

  • for example ：8841/8843/8845 You can use

Configuration steps

• node 1： To configure Nacos8841

  1. Configure data sources

  2. Modify port number ：8841

  3. Configure the cluster configuration file

  4. Start the service ：startup.cmd

• node 2： Copy Nacos8843

  • Modify port number ：8843

  • Start the service ：startup.cmd

• node 3： Copy Nacos8845

  • Modify port number ：8845

  • Start the service ：startup.cmd  

Configuration details

1） Configuration node 1

1. Copy nacos, And rename nacos-2.1.0-8841

2. Configure data sources

Modify port number ：8841  

Configure the cluster configuration file ：conf/cluster.conf

Start the service ：startup.cmd

Successful startup  

2） Configuration node 2

• Replication node nacos-2.1.0-8841, And rename nacos-2.1.0-8843

• Modify port number

Start the service

3） Configuration node 3

• Replication node nacos-2.1.0-8841, And rename nacos-2.1.0-8845

• Modify port number

Start the service

4） Configuration is successful

Common mistakes

1）db.num is null

• Error message ：db.num is null

• reason ： No configuration database

2） unable to start embedded tomcat

• Error message ：unable to start embedded tomcat

• reason 1： No cluster configuration file is written

3） Out of memory

• Prompt information ：

• reason ： Out of memory , Modify the allocated memory size

4） Cannot determine JNI library name for ARCH='x86' OS='windows 10' name='rocksdb'

• Prompt information ：Cannot determine JNI library name for ARCH='x86' OS='windows 10' name='rocksdb'

• reason ：nacos And jdk System digits （64 Bit and 32 position ,） atypism

5） JNI Related errors

• Prompt information ： C:\Users\Administrator\AppData\Local\Temp\/librocksdbjni1411968517689619912.dll: Can't find dependent libraries

• reason ：JAVA_HOME Configured jdk The installation directory , instead of jre The installation directory