Detailed explanation of nacos cluster configuration

Preamble:
To avoid a single point of failure, nacos needs to adopt cluster mode, and the database must be replaced with a high-availability mysql database (the built-in derby database is difficult to achieve consistent cluster configurationsex)

1. nacos switch mysql database
   The downloaded nacos installation package comes with nacos-mysql.sql script
   
   Execute this script in your own mysql database, and create a nacos_config database before executing it.After executing the script as shown in the figure:
   
   Now start to modify nacos/In the application.properties configuration file under conf, configure the mysql configuration information.As shown in the figure:
   
   Finally restart nacos and visit localhost:8848/nacos, you can log in.
   If the startup is unsuccessful, it may be that the mysql version that comes with nacos is too low, and replace it with your own.
   Solution: Create a new plugins/mysql (mkdir plugins &mkdir plugins/mysql) in the nacos directory, and add the own version of the mysql.jar package (I use 8.0.28)
   > Restart the service and you are done!Test it, you can add a configuration information by yourself
   Local mysql query:
   
   So far, nacos has completed switching mysql database.
2. Build a nacos cluster (1 nginx+3 nacos+mysql, it is recommended to complete it under Linux)

• Modify the nacos/bin/startup.sh configuration file
  Before modifying, you can make a copy of the startup.sh file, cp startup.sh startup.sh.bk. Then modify startup.sh.
  Modify the following points in order:
  The first point:
  
  Second place:
  
  startup.sh, save and exit after modification.
  Here we use ports to map 3 different nacos, so we have to configure port parameters.
• Modify cluster.conf(nacos/conf/cluster.conf)
  

3. Configure nginx

• Modify nginx.conf
  

4. Start nacos and nginx

• Execute ./startup.sh -p 3333, ./startup.sh -p 4444, ./startup.sh -p 5555 in sequence
  The following information appears, indicating success
  
  You can also view the log information output by start.out
  
  View the number of nacos clusters: ps -ef|grep nacos|grep -v grep|wc -l
  Display 3 is right

• Start nginx
  nginx -c nginx.conf (your nginx.conf directory)
  

• Access nacos cluster through nginx
  http://192.168.1.100:1111/nacos/#/login
  Successful access to nacos indicates that the cluster configuration is complete, you can self-test and add some configuration information, query the local mysql.
  

The SpringBoot is integrated later, and the configuration of each microservice can be changed to the cluster configuration, that is, to the address monitored by nginx.

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