环境：

Centos 7
Docker
Nginx

本次利用宿主机和两个nginx容器来实现负载均衡宿主机无任何内容只搭载一台nginx服务器并由此台服务器将请求转发给两个nginx容器来进行处理那就让我们的实验开始吧！

一、安装相关环境
1.安装Docker（个人推荐配置阿里云源）
2.宿主机安装Nginx
下面我比较偷懒直接wget Nginx rpm包
老规矩先关防火墙和selinux

[root@cany ~]# systemctl stop firewalld.service[root@cany ~]# setenforce 0[root@cany ~]# yum install docker -y[root@cany ~]# wget http://dl.Fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm[root@cany ~]# yum install nginx -y

用命令测试是否成功安装能否开启服务

[root@cany ~]# systemctl start docker.service[root@cany ~]# systemctl start nginx.service Centos 7 启动服务命令与6.x不同哦

测试web界面是否显示？

Docker部署nginx实现负载均衡

完全ok啦没问题！！！

下面我们来删除掉nginx默认html 并创建一个空白index.html

[root@cany ~]# cd /usr/share/nginx/html/[root@cany html]# rm *rm: remove regular file ‘404.html’? y
rm: remove regular file ‘50x.html’? y
rm: remove regular file ‘index.html’? y
rm: remove regular file ‘nginx-logo.png’? y
rm: remove regular file ‘poweredby.png’? y
[root@cany html]# touch index.html

为什么要创建一个空白index.html呢？
答：其实我一开始也是全删的结果发现访问无效才想起要让nginx有响应才会触发nginx.conf配置也就是才会触发我们配置的负载均衡这是我个人的理解有错误敬请提出

二、安装Nginx容器
1.pull nginx镜像

[root@cany ~]# docker pull hub.c.163.com/library/nginx:latest 下载最新Nginx镜像Trying to pull repository hub.c.163.com/library/nginx ...
latest: Pulling from hub.c.163.com/library/nginx5de4b4d551f8: Pull complete d4b36a5e9443: Pull complete 0af1f0713557: Pull complete Digest: sha256:f84932f738583e0169f94af9b2d5201be2dbacc1578de73b09a6dfaaa07801d6

2.pull完成使用docker images命令查看

[root@cany ~]# docker imagesREPOSITORY TAG IMAGE ID CREATED SIZE
hub.c.163.com/library/nginx latest 46102226f2fd 9 months ago 109.4 MB

3.Docker run 创建容器

[root@cany ~]# docker run -p 8080:80 --name nginx_web1 -it hub.c.163.com/library/nginx /bin/bash 容器名：nginx_web1 映射容器8080端口到宿主机的80端口上

进入nginx_web1容器的nginx目录下创建一个index.html

root@53cda1b9de1e:/# cd /usr/share/nginx/html/root@53cda1b9de1e:/usr/share/nginx/html# ls 50x.html index.html
root@53cda1b9de1e:/usr/share/nginx/html# rm *root@53cda1b9de1e:/usr/share/nginx/html# echo hello nginx_web1 Cany > index.html root@53cda1b9de1e:/usr/share/nginx/html# exit

下面创建多一个新的nginx容器

[root@cany ~]# docker run -p 8081:80 --name nginx_web2 -it hub.c.163.com/library/nginx /bin/bash 容器名：nginx_web2 映射容器8081端口到宿主机的80端口上

进入nginx_web2容器的nginx目录下创建一个index.html

root@41b3eec738b5:/# cd /usr/share/nginx/html/root@41b3eec738b5:/usr/share/nginx/html# ls 50x.html index.html
root@41b3eec738b5:/usr/share/nginx/html# rm *root@41b3eec738b5:/usr/share/nginx/html# echo hello nginx_web2 Cany > index.htmlroot@41b3eec738b5:/usr/share/nginx/html# exit

exit退出后容器不运行先启动两个nginx容器再执行启动服务命令

[root@cany ~]# docker start 41b3eec738b541b3eec738b5
[root@cany ~]# docker start 53cda1b9de1e53cda1b9de1e
[root@cany ~]# docker exec -d 41b3eec738b5 service nginx start [root@cany ~]# docker exec -d 53cda1b9de1e service nginx start

三、配置主机host文件
宿主机ip 10.2.4.88 对应 www.abc.top
Docker部署nginx实现负载均衡

四、配置宿主机Nginx.conf文件

[root@cany ~]# find / -name nginx.conf 查找nginx.conf文件/etc/nginx/nginx.conf

在http段加入以下代码

upstream www.abc.top {
server 10.2.4.88:8080 weight=10;
server 10.2.4.88:8081 weight=20;
}

server{
    listen 80;
    server_name www.abc.top;
    location / {
        proxy_pass         http://www.abc.top;
        proxy_set_header   Host             $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    }
}

配置如下图

Docker部署nginx实现负载均衡