大家都知道，nginx是当前应用非常广泛的web服务器，热度因为他的高并发高性能高可靠性，且轻量级！牛逼的不行，不多说这些。
今天要介绍的是，如何基于nginx和lua脚本，也就是在openresty的环境下，实现动态的反向代理逻辑，有一个开关控制。开关控制反向代理工作在nginx原生的upstream的模式，还是工作在lua控制的动态代理模式。 动态代理的服务器，通过http请求实现灵活的操作，向lua_shared_dict定义的全局变量里面写入或者删除动态代理的服务器信息。
环境信息如下：
[root@bogon sbin]# ./nginx -V
nginx version: openresty/1.11.2.2
built by gcc 4.8. (Red Hat 4.8.-) (GCC)
built with OpenSSL 1.0.1e-fips Feb
TLS SNI support enabled
configure arguments: --prefix=/usr/local/openresty/nginx --with-cc-opt=-O2 --add-module=../ngx_devel_kit-0.3. --add-module=../echo-nginx-module-0.60 --add-module=../xss-nginx-module-0.05 --add-module=../ngx_coolkit-.2rc3 --add-module=../set-misc-nginx-module-0.31 --add-module=../form-input-nginx-module-0.12 --add-module=../encrypted-session-nginx-module-0.06 --add-module=../srcache-nginx-module-0.31 --add-module=../ngx_lua-0.10. --add-module=../ngx_lua_upstream-0.06 --add-module=../headers-more-nginx-module-0.32 --add-module=../array-var-nginx-module-0.05 --add-module=../memc-nginx-module-0.17 --add-module=../redis2-nginx-module-0.13 --add-module=../redis-nginx-module-0.3. --add-module=../rds-json-nginx-module-0.14 --add-module=../rds-csv-nginx-module-0.07 --with-ld-opt=-Wl,-rpath,/usr/local/openresty/luajit/lib --add-module=/opt/nginx-rtmp-module-master --with-http_ssl_module
先设计一下功能模块，在nginx.conf文件里面，有如下几个location：
location / {。。。}
业务逻辑的入口
location /config {。。。}
动态反向代理开关控制入口
location /add_ups {。。。}
添加反向代理的服务器信息进入lua_shared_dict定义的全局表单
location /stop_ups {。。。}
从lua_shared_dict定义的全局表单里面删除掉不再参与反向代理的服务器信息
location /check_ups {。。。}
查看当前lua_shared_dict定义的全局表单里面有那些服务器信息
为了验证这个设计，我在本地开发机器上，将同一个RDConsumer应用部署在3个不同的端口下，对应于nginx里面的upstream块：
upstream robot_ups {
server 10.90.9.20:;
server 10.90.9.20:;
server 10.90.9.20:;
}
在这里，强调一下，这里，我们验证的动态反向代理，是轮询的方式，当然，根据需要可以设计成符合各自业务的逻辑。
下面，对这个设计的全部过程进行详细介绍。若有需要，可以用起来或者转走，觉得好，还可以点个赞，或者加个关注！
1. nginx.conf的配置文件
#user nobody;
worker_processes ; error_log logs/error.log;
error_log logs/error.log notice;
error_log logs/error.log info; #pid logs/nginx.pid; events {
worker_connections ;
use epoll;
} http {
lua_shared_dict dyn_ups_zone 10m; 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; sendfile on;
#tcp_nopush on; #keepalive_timeout ;
keepalive_timeout ; #gzip on; upstream robot_ups {
server 10.90.9.20:;
server 10.90.9.20:;
server 10.90.9.20:;
} server {
listen ;
server_name localhost; #charset koi8-r; location / {
set_by_lua_file $cur_ups /opt/shihuc/luahome/ablb/bussups.lua
proxy_next_upstream off;
proxy_set_header Host $host:$server_port;
proxy_set_header Remote_Addr $remote_addr;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://$cur_ups;
} location /config {
default_type text/plain;
content_by_lua_block {
local foo = ngx.req.get_uri_args()["foo"]
if foo == nil then
ngx.say("usage: /config?foo=off, or /config?foo=on")
return;
end
ngx.log(ngx.INFO, "config ab deploy feature: ", foo);
ngx.say("config ab deploy feature: ", foo); ngx.shared.dyn_ups_zone:set("robotfoo", foo);
}
} location /stop_ups {
default_type text/plain;
content_by_lua_file /opt/shihuc/luahome/ablb/stopups.lua;
} location /add_ups {
default_type text/plain;
content_by_lua_block {
local add_s = ngx.req.get_uri_args()["ups"]
if add_s == nil then
ngx.say("usage: /add_ups?ups=x.x.x.x")
return "no add_s"
end
ngx.log(ngx.INFO, "add upstream server: ", add_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("first init global dict dyn_ups_zone");
ups = add_s
else
local unders = "-";
ups = ups..unders
ups = ups..add_s
end
local succ, err, forcible = dynupszone:set("robotups", ups);
ngx.say("succ: ",succ, ", err: ", err, ", forcible: ", forcible);
ngx.say(dynupszone.get(dynupszone, "robotups"))
}
} location /check_ups {
default_type text/plain;
content_by_lua_block {
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
ngx.say(ups);
}
} error_page /50x.html;
location = /50x.html {
root html;
}
}
}
2. 调用add_ups url向全局缓存lua_shared_dict dyn_ups_zone 10m填写数据。
对应的后台日志如下：
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: add upstream server: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8081 HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: add upstream server: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8090 HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: add upstream server: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:9080 HTTP/1.1", host: "10.90.7.10"
3. config配置灰度启用
日志请参考：
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: config ab deploy feature: on, client: 10.90.9.20, server: localhost, request: "GET /config?foo=on HTTP/1.1", host: "10.90.7.10"
4. 在不做灰度停用机器的时候，看看请求如何调度。这里，我的测试应用在本地部署了3个，端口区分。在10.90.7.10这个nginx上做反向代理，轮询分发请求。我执行了4次请求，通过restlet client （chrome的一个http模拟插件），nginx的后台日志如下：
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: nil, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从日志看，轮询是没有问题的。轮询的依据，是在nginx的全局变量dyn_ups_zone里面定义了一个cnt的变量，记录请求次数。请求数与当前反向代理里面的机器数量求模。用余数作为lua列表的下标，求出服务器IP端口信息。作为反向代理的机器。
这里要注意的是：
a. lua数组或者列表下标不是从0开始，而是1.
b. lua数组的下标，可以是不同数据类型的值，不像java等高级语言，是数字下标。
5. 停用一台服务器，通过stop_ups调用。然后查看反向代理跳转是否生效。
发现stop操作，有点问题，请看下图，原来3个应用，停了中间一个，最后的ups列表中怎么只有一个应用服务器信息了？先看看stopups.lua的脚本吧：
#!/usr/bin/env lua function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= then
return
end local start =
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end table.insert (t, string.sub (s, start, pos - ))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start)) return t
end local stop_s = ngx.req.get_uri_args()["ups"];
if stop_s == nil then
ngx.say("usage: /stop_ups?ups=x.x.x.x");
return "no stop_s"
end
ngx.say("stop upstream server: ", stop_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("currently, there is no server ip to stop...");
return;
end
local table_ups = split(ups, "-");
ngx.say(table_ups);
local delid=;
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v == stop_s then
delid = k;
end
end
table_ups[delid] = nil;
ngx.say(table_ups);
local new_ups = table.concat(table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);
分析一下，发现，table数据table_ups里面设置nil的值，其实也是可以的。但是，在做table.concat的时候，会将第一个nil作为数据拼接的结束标识了，于是nil后面的数据不被计入。调整一下统计余下应用服务器信息的算法。调整后如下（local table_ups = split(ups, "-");代码之前的不变）：
local table_ups = split(ups, "-");
ngx.say(table_ups);
local new_table_ups = {}
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v ~= stop_s then
table.insert(new_table_ups, v);
end
end
ngx.say(new_table_ups);
local new_ups = table.concat(new_table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);
重复前面的操作，再进行stop_ups，就得到合理的结果，如图:
在模拟发送请求4次，看看日志：
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: nil, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从日志看，现在ups的服务器只有2个了，刚才stop掉的一个，不再了。执行4次请求，分别在余下的2个服务器之间轮询。合乎逻辑设计。
6. 关闭灰度发布的开发，执行config?foo=off。参考题config_off,nginx的后台日志如下：
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: config ab deploy feature: off, client: 10.90.9.20, server: localhost, request: "GET /config?foo=off HTTP/1.1", host: "10.90.7.10"
7. 在关闭灰度开关的情况下，看看反向代理的逻辑。主要看看后台日志：
第1次请求：
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从部署的3台应用服务器上来看，这次调度到8089端口的应用了。
第2次请求：
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从部署的3台应用服务器上来看，这次调度到8081端口的应用了。
第3次请求：
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从部署的3台应用服务器上来看，这次调度到9080端口的应用了。
基于上面3次foo=off的模拟调用来看，程序运行于upstream模块的轮询模式。这个时候全局变量ups里面只有2个服务器应用。
8. 将刚才灰度停用的服务器8090加回来，再次启用foo=on，动态轮询验证。
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: add upstream server: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8090 HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] content_by_lua(nginx.conf:):: config ab deploy feature: on, client: 10.90.9.20, server: localhost, request: "GET /config?foo=on HTTP/1.1", host: "10.90.7.10" // :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: cnt: , client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: ups list: 10.90.9.20:-10.90.9.20:-10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
// :: [info] #: * [lua] bussups.lua:: idx: , exc: ,current ups: 10.90.9.20:, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
从nginx日志以及应用程序的后台日志看，灰度的负载均衡方向代理逻辑，依然正常。
到此，整个验证完美收官！下面，附上，nginx.conf配置中涉及到的几个lua的脚本文件：
bussups.lua:
#!/usr/bin/env lua function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= then
return
end local start =
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end table.insert (t, string.sub (s, start, pos - ))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start)) return t
end local ups = ngx.shared.dyn_ups_zone:get("robotups");
local foo = ngx.shared.dyn_ups_zone:get("robotfoo");
local cnt = ngx.shared.dyn_ups_zone:get("robotcnt");
ngx.log(ngx.INFO, "ups: ", ups);
ngx.log(ngx.INFO, "foo: ", foo);
ngx.log(ngx.INFO, "cnt: ", cnt); if cnt == nil then
cnt = ;
end
ngx.shared.dyn_ups_zone:set("robotcnt", cnt+); if foo == "on" then
if ups ~= nil then
--ngx.log(ngx.info, "get robotups server list: ", ups)
ngx.log(ngx.INFO, "ups list: ", ups);
local table_ups = split(ups, "-");
local exc = ;
for k,v in ipairs(table_ups) do
exc = exc + ;
end
local idx = cnt % exc;
if idx == then --lua array index from , not from
idx = exc;
end
local cur_ups = table_ups[idx];
ngx.log(ngx.INFO, "idx: ", idx, ", exc: ", exc, " ,current ups: ", cur_ups);
return cur_ups
end
ngx.log(ngx.INFO, "ab lb configuration error, use default upstream");
return "robot_ups";
else
ngx.log(ngx.INFO, "use default upstream");
return "robot_ups";
end
stopups.lua:
#!/usr/bin/env lua function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= then
return
end local start =
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end table.insert (t, string.sub (s, start, pos - ))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start)) return t
end local stop_s = ngx.req.get_uri_args()["ups"];
if stop_s == nil then
ngx.say("usage: /stop_ups?ups=x.x.x.x");
return "no stop_s"
end
ngx.say("stop upstream server: ", stop_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("currently, there is no server ip to stop...");
return;
end
local table_ups = split(ups, "-");
ngx.say(table_ups);
local new_table_ups = {}
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v ~= stop_s then
table.insert(new_table_ups, v);
end
end
ngx.say(new_table_ups);
local new_ups = table.concat(new_table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);
nginx功能强大，配合上lua脚本，在ngx_lua模块的存在下，功能就更加强大。感兴趣的话，可以加我关注哟，我们一起探讨！