通过URL参数请求不同的后端服务器
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内网通过K8S搭建多个分支测试环境,可是如果外网需要访问而且域名都是一致的情况下,这个时候变得麻烦了。如何通过不同的请求参数访问不同的后端环境呢,答案是可以的,通过lua可以达到。入口:
http://fengwan.blog.51cto.com/?envs=branches #branches环境
http://fengwan.blog.51cto.com/?envs=branchesv2 #branchesv2环境
另外考虑到APP请求的时候无法通过参数来处理,我们可以添加统一的请求header: envs
curl --header "envs:branches" http://fengwan.blog.51cto.com
curl --header "envs:branchesv2" http://fengwan.blog.51cto.com
我们通过Openresty判断头部然后选择不同的后端环境
nginx配置:
upstream branches {
server 10.254.220.47:80;
}
upstream branchesv2 {
server 10.254.60.225:80;
}
upstream default {
server 10.254.220.47:80;
}
server {
listen 80;
server_name fengwan.blog.51cto.com;
location / {
lua_code_cache on;
set $upstreamhost "";
rewrite_by_lua_file /etc/nginx/conf.d/html/proxy.lua;
proxy_redirect off ;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 50m;
client_body_buffer_size 256k;
proxy_connect_timeout 30;
proxy_send_timeout 30;
proxy_read_timeout 60;
proxy_buffer_size 256k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
proxy_max_temp_file_size 128m;
proxy_pass http://$upstreamhost;
}
}
lua脚本内容
/etc/nginx/conf.d/html/proxy.lua;
local request_method = ngx.var.request_method
local args = nil
local param = nil
local param2 = nil
if "GET" == request_method then
args = ngx.req.get_uri_args()
elseif "POST" == request_method then
ngx.req.read_body()
args = ngx.req.get_post_args()
end
if ngx.var.cookie_envs == ‘branches‘ then
ngx.var.upstreamhost = "branches"
elseif ngx.var.cookie_envs == ‘branchesv2‘ then
ngx.var.upstreamhost = "branchesv2"
end
if not args or not args["envs"] then
if not ngx.req.get_headers()[‘envs‘] then
ngx.var.upstreamhost = "tags"
elseif ngx.req.get_headers()[‘envs‘] == ‘branches‘ then
ngx.var.upstreamhost = "branches"
elseif ngx.req.get_headers()[‘envs‘] == ‘branchesv2‘ then
ngx.var.upstreamhost = "branchesv2"
else
ngx.var.upstreamhost = "tags"
end
elseif args["envs"] == ‘branches‘ then
ngx.header["Set-Cookie"]= "envs=branches; path=/"
ngx.var.upstreamhost = "branches"
elseif args["envs"] == ‘branchesv2‘ then
ngx.header["Set-Cookie"]= "envs=branchesv2; Path=/"
ngx.var.upstreamhost = "branchesv2"
end
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