Detailed explanation of the construction process of Nacos cluster

I. Nacos cluster deployment architecture

In the actual development process, if Nacos is used, in order to ensure high availability, we generally deploy it in a cluster.Nacos stipulates that the number of Nacos nodes in the cluster must be greater than or equal to 3; at the same time, the data of Nacos in stand-alone mode is stored in its embedded database by default, which is inconvenient to observe the basic situation of data storage.Moreover, if multiple Nacos nodes with default configuration are started in the cluster, there is a consistency problem in data storage.In order to solve this problem, Nacos adopts a centralized storage method to support clustered deployment, and currently only supports MySQL storage; in addition, we also need to use Nginx to achieve load balancing.The deployment architecture diagram of this process is shown below:

Second, switch the default database of Nacos

(1) Before starting to build the cluster, we need to switch the default database derby of Nacos to mysql.
First start the local mysql, create the nacos_config database, and execute the nacos-mysql.sql script under the nacos_config database, as shown in the following figure:

After successful execution, view the created data table:

(2) My Nacos is directly decompressed under the /opt path, find and modify the application.properties file under the /opt/nacos/conf path, and paste the following content directly to the end of application.properties (note thatdb.user and db.password should be modified to their own mysql username and password):

spring.datasource.platform=mysqldb.num=1db.url.0=jdbc:mysql://127.0.0.1:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=truedb.user=rootdb.password=123456

Third, modify the cluster configuration of Nacos

(1) Similarly, in the /opt/nacos/conf directory, find and modify the cluster.conf file, as shown below:

(2) In the /opt/nacos/bin directory, find and modify the startup.sh file. The places to be modified are shown in the following figure:

① Before modification:

After modification:

② Before modification:

After modification:

After the modification is completed, you can use the following command in the /opt/nacos/bin path to start the nacos node corresponding to the port number:

Fourth, configure Nginx to achieve load balancing

(1) Find and modify the nginx.conf file under the /usr/local/nginx/conf path. The places that need to be modified are shown in the following figure (for the convenience of demonstration, the nginx cluster will not be built here, only theAn nginx is used as an example to illustrate):

V. Test effect

(1) Start nginx first, and then start the nacos nodes of 3333, 4444, and 5555 in turn

(2) Close the linux local firewall or open the corresponding port number that needs to be accessed on linux

(3) For example, my linux ip is 192.168.1.103, so I can successfully access the nacos interface by accessing 192.168.1.103:1111/nacos on Windows (here is 1111 because it was just exposed in the nginx configuration fileThe port number is 1111).

(4) Create new configuration information in the nacos interface:

(5) You can view the newly created configuration information in mysql of linux:

(6) So far, the Nacos cluster + MySQL centralized storage + Nginx load balancing has been successfully built.

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