內網通過K8S搭建多個分支測試環境,可是如果外網需要訪問而且域名都是一致的情況下,這個時候變得麻煩了。如何通過不同的請求參數訪問不同的後端環境呢,答案是可以的,通過lua可以達到。
入口:
http://fengwan.blog.51cto.com/?envs=branches #branches環境
http://fengwan.blog.51cto.com/?envs=branchesv2 #branchesv2環境
另外考慮到APP請求的時候無法通過參數來處理,我們可以添加統一的請求header: envs
curl --header "envs:branches" http://fengwan.blog.51cto.com
curl --header "envs:branchesv2" http://fengwan.blog.51cto.com
我們通過Openresty判斷頭部然後選擇不同的後端環境
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腳本內容
/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 = "default"
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