Tengine 反向代理状态检测
安装Tengine：
编译安装
./configure --prefix=/usr/loca/nginx
make && make install
配置upstream server：
#user nobody; user nginx nginx; worker_processes 1;
#pid logs/nginx.pid; events { worker_connections 1024; } # load modules compiled as Dynamic Shared Object (DSO) # #dso { # load ngx_http_fastcgi_module.so; # load ngx_http_rewrite_module.so; #} http { include 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 logs/access.log main; #access_log "pipe:rollback logs/access_log interval=1d baknum=7 maxsize=2G" main; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; #gzip on; # server { # listen 80; # server_name localhost; #charset koi8-r; #access_log logs/host.access.log main; #access_log "pipe:rollback logs/host.access_log interval=1d baknum=7 maxsize=2G" main; # location / { # root html; # index index.html index.htm; # } #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 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; #} #} # another virtual host using mix of IP-, name-, and port-based configuration # #server { # listen 8000; # listen somename:8080; # server_name somename alias another.alias; # location / { # root html; # index index.html index.htm; # } #} # HTTPS server # #server { # listen 443 ssl; # server_name localhost; # ssl_certificate cert.pem; # ssl_certificate_key cert.key; # ssl_session_cache shared:SSL:1m; # ssl_session_timeout 5m; # ssl_ciphers HIGH:!aNULL:!MD5; # ssl_prefer_server_ciphers on; # location / { # root html; # index index.html index.htm; # } #} upstream tomcat { ip_hash; server 192.168.137.201:8080; server 192.168.137.202:8080; check interval=3000 rise=2 fall=5 timeout=1000 type=http; check_http_send "HEAD / HTTP/1.0 "; check_http_expect_alive http_2xx http_3xx; } upstream tomcat-1 { ip_hash; server 192.168.137.201:8081; server 192.168.137.202:8081; check interval=3000 rise=2 fall=5 timeout=1000 type=http; #状态检测 check_http_send "HEAD / HTTP/1.0 "; check_http_expect_alive http_2xx http_3xx; } server { listen 80; server_name 127.0.0.1; index index.jsp index.html; location / { proxy_pass http://tomcat; #以这种格式来使用后端的web服务器 proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; client_max_body_size 10m; client_body_buffer_size 128k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } #location /status { #check_status; #access_log off; #} #location /nginx_status { #stub_status on; #access_log off; #} } server { listen 8000; server_name 127.0.0.1; index index.jsp index.html; location / { proxy_pass http://tomcat-1; #以这种格式来使用后端的web服务器 proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; client_max_body_size 10m; client_body_buffer_size 128k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } } include /usr/local/nginx/conf/vhosts/*.conf; }
状态检测模块可以为Tengine提供主动式后端服务器健康检查的功能。
该模块在Tengine-1.4.0版本以前没有默认开启，它可以在配置编译选项的时候开启：./configure --with-http_upstream_check_module
编辑/etc/nginx/nginx.conf
http { upstream cluster1 { # simple round-robin server 192.168.30.116:80; #server 192.168.0.2:80; check interval=3000 rise=2 fall=5 timeout=1000 type=http; check_http_send "HEAD / HTTP/1.0 "; check_http_expect_alive http_2xx http_3xx; } upstream cluster2 { # simple round-robin server 192.168.30.113:80; server 192.168.30.114:80; check interval=3000 rise=2 fall=5 timeout=1000 type=http; check_keepalive_requests 100; check_http_send "HEAD / HTTP/1.1 Connection: keep-alive "; check_http_expect_alive http_2xx http_3xx; } server { listen 80; location /1 { proxy_pass http://cluster1; } location /2 { proxy_pass http://cluster2; } location /status { check_status; access_log off; allow SOME.IP.ADD.RESS; deny all; } } }
指令后面的参数意义是：
interval：向后端发送的健康检查包的间隔。
fall(fall_count): 如果连续失败次数达到fall_count，服务器就被认为是down。
rise(rise_count): 如果连续成功次数达到rise_count，服务器就被认为是up。
timeout: 后端健康请求的超时时间。
default_down: 设定初始时服务器的状态，如果是true，就说明默认是down的，如果是false，就是up的。默认值是true，也就是一开始服务器认为是不可用，要等健康检查包达到一定成功次数以后才会被认为是健康的。
type：健康检查包的类型，现在支持以下多种类型
tcp：简单的tcp连接，如果连接成功，就说明后端正常。
ssl_hello：发送一个初始的SSL hello包并接受服务器的SSL hello包。
http：发送HTTP请求，通过后端的回复包的状态来判断后端是否存活。
mysql: 向mysql服务器连接，通过接收服务器的greeting包来判断后端是否存活。
ajp：向后端发送AJP协议的Cping包，通过接收Cpong包来判断后端是否存活。
port: 指定后端服务器的检查端口。你可以指定不同于真实服务的后端服务器的端口，比如后端提供的是443端口的应用，你可以去检查80端口的状态来判断后端健康状况。默认是0，表示跟后端server提供真实服务的端口一样。该选项出现于Tengine-1.4.0。
check_http_send http_packet:
该指令可以配置http健康检查包发送的请求内容。为了减少传输数据量，推荐采用"HEAD"方法。
当采用长连接进行健康检查时，需在该指令中添加keep-alive请求头，如："HEAD / HTTP/1.1
Connection: keep-alive
"。 同时，在采用"GET"方法的情况下，请求uri的size不宜过大，确保可以在1个interval内传输完成，否则会被健康检查模块视为后端服务器或网络异常。
check_http_expect_alive: 该指令指定HTTP回复的成功状态，默认认为2XX和3XX的状态是健康的。
check_status:
显示服务器的健康状态页面。该指令需要在http块中配置。
在Tengine-1.4.0以后，你可以配置显示页面的格式。支持的格式有: html、csv、 json。默认类型是html。