负载均衡健康检查

在Nginx官方模块提供的模块中，没有对负载均衡后端节点的健康检查模块，但可以使用第三方模块。
`nginx_upstream_check_module`来检测后端服务的健康状态

1.安装依赖包

[root@lb02 ~]# yum install -y gcc glibc gcc-c++ pcre-devel openssl-devel patch

2.下载nginx源码包以及nginx_upstream_check模块第三方模块

 

[root@lb02 ~]# wget http://nginx.org/download/nginx-1.14.2.tar.gz
[root@lb02 ~]# wget https://github.com/yaoweibin/nginx_upstream_check_module/archive/master.zip

3.解压nginx源码包以及第三方模块

[root@lb02 ~]# tar xf nginx-1.14.2.tar.gz
[root@lb02 ~]# unzip master.zip

4.进入nginx目录，打补丁(nginx的版本是1.14补丁就选择1.14的,p1代表在nginx目录，p0是不在nginx目录)

 

 

[root@lb02 ~]# cd nginx-1.14.2/

[root@lb02 nginx-1.14.2]# patch -p1 <../nginx_upstream_check_module-master/check_1.14.0+.patch

[root@lb02 nginx-1.14.2]# ./configure --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --add-module=/root/nginx_upstream_check_module-master --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie'

[root@lb02 nginx-1.14.2]# make && make install

5.在已有的负载均衡上增加健康检查的功能

 

 

 

 

[root@lb02 /etc/nginx]# vim /etc/nginx/nginx.conf
http {
    include conf.d/*.conf;
    ... ...
}
 
[root@lb02 /etc/nginx]# mkdir /etc/nginx/conf.d

[root@lb02 ~]# vim /etc/nginx/conf.d/proxy_web.conf
upstream web {
    server 172.16.1.7:80 max_fails=2 fail_timeout=10s;
    server 172.16.1.8:80 max_fails=2 fail_timeout=10s;
    check interval=3000 rise=2 fall=3 timeout=1000 type=tcp;
    #interval  检测间隔时间，单位为毫秒
    #rise      表示请求2次正常，标记此后端的状态为up
    #fall      表示请求3次失败，标记此后端的状态为down
    #type      类型为tcp
    #timeout   超时时间，单位为毫秒
}

server {
    listen 80;
    server_name linux.web.com;
    location / {
        proxy_pass http://web;
        include proxy_params;
    }

    location /upstream_check {
        check_status;
    }
}

[root@lb02 ~]# vim /etc/nginx/proxy_params
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 60s;
proxy_read_timeout 60s;
proxy_send_timeout 60s;
proxy_buffering on;
proxy_buffer_size 32k;
proxy_buffers 8 128k;

6.创建用户和目录

[root@lb02 ~]# groupadd nginx -g 666
[root@lb02 ~]# useradd nginx -u 666 -g 666
[root@lb02 ~]# mkdir -p  /var/cache/nginx/

7.启动并配置本地hosts文件

[root@lb02 ~]# /usr/sbin/nginx

 

8.访问