在我们日常使用高可用集群时，都会使用到负载均衡工具对多个节点的负载进行转发。这里就不得不提到我们常用的一个负载均衡工具Nginx，Nginx官方提供的免费版本功能相对简单，大部分情况下我们都是用其进行负载均衡，对于应用的状态主要是依赖于其他的监控工具。如果对于小型的团队来说，部署专门的监控工具还需要资源，使用Nginx对应用进行探活监控可以节约这部分成本。
首先安装Nginx
使用yum安装nginx我这里使用的是1.16.1版本
yum install nginx |
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安装完成后可以获取源码安装命令
nginx -V |
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安装Nginx探活插件
下载源码与探活插件
wget https://nginx.org/download/nginx-1.16.1.tar.gzwget https://github.com/yaoweibin/nginx_upstream_check_module/archive/refs/heads/master.zip |
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Nginx使用源码编译安装相关的依赖包
yum install pcre pcre-devel openssl openssl-devel gd gd-devel zlib patch libxml2-devel libxslt-devel perl-devel perl-ExtUtils-Embed perl zlib-devel patch |
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解压源码和插件包，我这里将两个软件包全部放到/opt下面进行解压
tar zxvf nginx-1.16.1.tar.gzunzip nginx_upstream_check_module.zip |
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patch探活插件到Nginx源码中
cd /opt/nginx-1.16.1patch -p1 < /opt/nginx_upstream_check_module-master/check_1.16.1 .patch |
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执行源码编译安装，添加http探活插件
./configure --prefix=/usr/share/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 --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/run/nginx.pid --lock-path=/run/lock/subsys/nginx --user=nginx --group=nginx --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_v2_module --with-http_realip_module --with-stream_ssl_preread_module --with-http_addition_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_perl_module=dynamic --with-http_auth_request_module --with-mail=dynamic --with-mail_ssl_module --with-pcre --with-pcre-jit --with-stream=dynamic --with-stream_ssl_module --with-debug --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --with-ld-opt='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-E' --add-module=/opt/nginx_upstream_check_module-master/ |
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使用Nginx负载Artifactory
Nginx可以作为Artifactory制品库的负载均衡器，用来负载Artifactory多个节点间的请求，Artifactory也可以自动生成Nginx配置文件，具体操作参考下图
配置探活
生成配置文件后，使用探活插件的配置方法，在Nginx的config 文件中进行配置。具体样例如下：
upstream artifactory {server 192.168.1.2:8082;server 192.168.1.3:8082; check interval=2000 rise=2 fall=2 timeout=1000 type=http; check_http_send "HEAD / HTTP/1.0rnrn"; check_http_expect_alive http_2xx http_3xx}upstream artifactory-direct {server 192.168.1.2:8081;server 192.168.1.3:8081; check interval=2000 rise=2 fall=2 timeout=1000 type=http; check_http_send "HEAD / HTTP/1.0rnrn"; check_http_expect_alive http_2xx http_3xx}server { listen 80 ; server_name artifactory.external.io; if ($http_x_forwarded_proto = '') { set $http_x_forwarded_proto $scheme; } ## Application specific logs ## access_log /var/log/nginx/artifactory.external.io -access.log timing; ## error_log /var/log/nginx/artifactory.external.io -error.log; rewrite ^/$ /ui/ redirect; rewrite ^/ui$ /ui/ redirect; chunked_transfer_encoding on; client_max_body_size 0; location / { proxy_read_timeout 2400s; proxy_pass_header Server; proxy_cookie_path ~*^/.* /; proxy_buffer_size 128k; proxy_buffers 40 128k; proxy_busy_buffers_size 128k; proxy_pass http://artifactory; proxy_set_header X-JFrog-Override-Base-Url $http_x_forwarded_proto://$host:$server_port; proxy_set_header X-Forwarded-Port $server_port; proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; location ~ ^/artifactory/ { proxy_pass http://artifactory-direct; } } location /status { check_status; access_log off; }} |
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探活配置成功之后访问，预置的location可以看到当前负载应用节点的健康状态
并且还支持json格式查看，方便我们进行数据采集
