（15）Docker之用Nginx實現SpringBoot應用的負載均衡簡單記錄

阿新 • • 發佈：2020-07-21

　　怎樣用Docker部署SpringBoot應用請參考上篇文章，本文假設已經部署了兩個SpringBoot應用：

　　訪問：http://192.168.43.151:8080/user/test輸出“測試1”

　　訪問：http://192.168.43.151:8081/user/test輸出“測試2”

　　下面說一下怎麼安裝Nginx，以及實現兩個應用的負載，本文采用簡單輪詢。

　　1、安裝Nginx

　　1）安裝映象

　　查詢映象

docker search nginx

　　拉取映象

docker pull nginx

　　說明：拉取的最新映象。ps：之前不知道怎麼誤刪了/var/lib/nginx下的tmp目錄，導致無法拉取，重建後好了。

　　2）根據映象，啟動構建容器

docker run -d -p 80:80 --name nginx_upstream nginx

　　2、準備Nginx配置檔案

　　編寫負載均衡檔案upstream_test.conf

upstream myLoad {
    server 192.168.43.151:8080;
    server 192.168.43.151:8081;
}

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    access_log  /var/log/nginx/test_proxy.access.log  main;
    resolver   
8.8.8.8;
    
    location / {
        proxy_pass http://myLoad;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on  
127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

　　修改主配置檔案nginx.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/upstream_test.conf;
}

　　注意：紅色字是新增或者修改的部分

　　3、將配置檔案放到容器中

docker cp /usr/local/mystore/dockerfile/nginx/conf/nginx.conf d3e3f77036d0:/etc/nginx/nginx.conf
docker cp /usr/local/mystore/dockerfile/nginx/conf/conf.d/upstream_test.conf d3e3f77036d0:/etc/nginx/conf.d/upstream_test.conf

　　【格式】docker cp 宿主機目錄容器ID:容器目錄

　　重新啟動容器