nginx+tomcat实现简单的负载均衡

host1：10.0.0.10（部署nginx和tomcat）

host2：10.0.0.11（部署tomcat）

平台环境（2主机一样）

[root@smp ~]# uname -r
3.10.0-862.el7.x86_64
[root@smp ~]# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core)

host1及host2上操作：

安装tomcat

https://www.cnblogs.com/liliyang/p/9742284.html

按照上面的博文将将两台机器上的tomcat均部署好，

然后访问 

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host1上安装nginx

yum install  wget -y

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

yum install  nginx  -y

cat  /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 2048;
    use epoll;
}

http {
    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;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    include /etc/nginx/conf.d/*.conf;

    upstream tomcatservers {　　　　　#这里注意tomcatserver为池的名称，这里的名称可任意取，但是名称内不能有下划线(有的书中使用了下划线)！！！！！！！

        server 10.0.0.10:8080 weight=1;
        server 10.0.0.11:8080 weight=1;
    }

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  10.0.0.10;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
            proxy_pass http://tomcatservers;　　　　#这里的名称必须是服务池的名称
            proxy_redirect default;

        }　　　　　　　　　　　　　　　　　　　　　　　　　　#除了红色部分其余均为系统默认配置

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}

[root@smp nginx]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@smp nginx]# systemctl start nginx

访问测试：