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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:
#branches环境 #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" curl --header "envs:branchesv2"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_methodlocal args = nillocal param = nillocal param2 = nilif "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()endif ngx.var.cookie_envs == 'branches' then ngx.var.upstreamhost = "branches"elseif ngx.var.cookie_envs == 'branchesv2' then ngx.var.upstreamhost = "branchesv2"endif 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" endelseif 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
转载于:https://blog.51cto.com/fengwan/2391359