概述

Nginx能够实现HTTP、HTTPS协议的负载均衡，也能够实现TCP协议的负载均衡。那么，问题来了，可不可以通过Nginx实现Apache Doris数据库的负载均衡呢？答案是：可以。接下来，就让我们一起探讨下如何使用Nginx实现Apache Doris的负载均衡。

环境准备

注意：使用Nginx实现Apache Doris数据库的负载均衡，前提是要搭建Apache Doris的环境，Apache Doris FE的IP和端口分别如下所示, 这里我是用一个FE来做演示的，多个FE只需要在配置里添加多个FE的IP地址和端口即可

IP: 172.31.7.119 
端口: 9030

通过Nginx访问MySQL的Apache Doris和端口如下所示。

• IP : 172.31.7.119

• 端口：6030

安装依赖

sudo apt-get install build-essential
sudo apt-get install libpcre3 libpcre3-dev 
sudo apt-get install zlib1g-dev
sudo apt-get install openssl libssl-dev 

安装Nginx

sudo wget http://nginx.org/download/nginx-1.18.0.tar.gz
sudo tar zxvf nginx-1.18.0.tar.gz

cd nginx-1.18.0
sudo ./configure --prefix=/usr/local/nginx --with-stream --with-http_ssl_module --with-http_gzip_static_module --with-http_stub_status_module
sudo make && make install

配置反向代理

我这里是新建了一个配置文件

vim /usr/local/nginx/conf/default.conf

然后再里面加上下面的内容

events {
  worker_connections  1024;
}
stream {
    upstream mysqld {
        hash $remote_addr consistent;
        server 172.31.7.119:9030 weight=1 max_fails=2 fail_timeout=60s;
        ##注意这里如果是多个FE，加载这里就行了
    }
    ###这里是配置代理的端口，超时时间等
    server {
        listen 6030;
        proxy_connect_timeout 30s;
        proxy_timeout 30s;
        proxy_pass mysqld;
    }
}

启动Nginx

指定配置文件启动

cd /usr/local/nginx
/usr/local/nginx/sbin/nginx -c conf.d/default.conf 

验证

mysql -uroot -P6030 -h172.31.7.119

参数解释: -u 指定Doris用户名 -p 指定Doris密码,我这里密码是空，所以没有 -h 指定Nginx代理服务器IP -P 指定端口

mysql -uroot -P6030 -h172.31.7.119
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.1.0 Doris version 0.15.1-rc09-Unknown

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| test               |
+--------------------+
2 rows in set (0.00 sec)

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+------------------+
| Tables_in_test   |
+------------------+
| dwd_product_live |
+------------------+
1 row in set (0.00 sec)
mysql> desc dwd_product_live;
+-----------------+---------------+------+-------+---------+---------+
| Field           | Type          | Null | Key   | Default | Extra   |
+-----------------+---------------+------+-------+---------+---------+
| dt              | DATE          | Yes  | true  | NULL    |         |
| proId           | BIGINT        | Yes  | true  | NULL    |         |
| authorId        | BIGINT        | Yes  | true  | NULL    |         |
| roomId          | BIGINT        | Yes  | true  | NULL    |         |
| proTitle        | VARCHAR(1024) | Yes  | false | NULL    | REPLACE |
| proLogo         | VARCHAR(1024) | Yes  | false | NULL    | REPLACE |
| shopId          | BIGINT        | Yes  | false | NULL    | REPLACE |
| shopTitle       | VARCHAR(1024) | Yes  | false | NULL    | REPLACE |
| profrom         | INT           | Yes  | false | NULL    | REPLACE |
| proCategory     | BIGINT        | Yes  | false | NULL    | REPLACE |
| proPrice        | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| couponPrice     | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| livePrice       | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| volume          | BIGINT        | Yes  | false | NULL    | REPLACE |
| addedTime       | BIGINT        | Yes  | false | NULL    | REPLACE |
| offTimeUnix     | BIGINT        | Yes  | false | NULL    | REPLACE |
| offTime         | BIGINT        | Yes  | false | NULL    | REPLACE |
| createTime      | BIGINT        | Yes  | false | NULL    | REPLACE |
| createTimeUnix  | BIGINT        | Yes  | false | NULL    | REPLACE |
| amount          | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| views           | BIGINT        | Yes  | false | NULL    | REPLACE |
| commissionPrice | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| proCostPrice    | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| proCode         | VARCHAR(1024) | Yes  | false | NULL    | REPLACE |
| proStatus       | INT           | Yes  | false | NULL    | REPLACE |
| status          | INT           | Yes  | false | NULL    | REPLACE |
| maxPrice        | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| liveView        | BIGINT        | Yes  | false | NULL    | REPLACE |
| firstCategory   | BIGINT        | Yes  | false | NULL    | REPLACE |
| secondCategory  | BIGINT        | Yes  | false | NULL    | REPLACE |
| thirdCategory   | BIGINT        | Yes  | false | NULL    | REPLACE |
| fourCategory    | BIGINT        | Yes  | false | NULL    | REPLACE |
| minPrice        | DECIMAL(18,2) | Yes  | false | NULL    | REPLACE |
| liveVolume      | BIGINT        | Yes  | false | NULL    | REPLACE |
| liveClick       | BIGINT        | Yes  | false | NULL    | REPLACE |
| extensionId     | VARCHAR(128)  | Yes  | false | NULL    | REPLACE |
| beginTime       | BIGINT        | Yes  | false | NULL    | REPLACE |
| roomTitle       | TEXT          | Yes  | false | NULL    | REPLACE |
| beginTimeUnix   | BIGINT        | Yes  | false | NULL    | REPLACE |
| nickname        | TEXT          | Yes  | false | NULL    | REPLACE |
+-----------------+---------------+------+-------+---------+---------+
40 rows in set (0.06 sec)