nginxnginx-configopenresty

How to set initial value for variable in Openresty

  1. What I want

I am using openresty stream, I want to set an variable in nginx.conf, and lua file can visit this variable.

  1. What have I tried

I have tried lua_add_variable, but it seems that lua_add_variable can not set initial value.

I also tried set $var value, but I got error:"set" directive is not allowed here , I think set can not be used in stream

  1. my codes

     nginx.conf

 stream {
     # lua_add_variable $servers_list "client1;client2";
     # set $servers_list "client1;client2"; # set not allowed here

     upstream backend {
         server 127.0.0.1:666;
     }
     server {
         lua_code_cache off;
         listen 65;
         preread_by_lua_file lua/echo.lua;
         content_by_lua_block {
             ngx.say("nerver reach here")
         }
     }

}

echo.lua

ngx.log(ngx.ERR, "list is ", ngx.var.servers_list) -- I want to get "client1;client2" here
Solution

  • The set directive is available for the stream subsystem — https://nginx.org/en/docs/stream/ngx_stream_set_module.html#set — but in the server context block only:

    Context: server

    To fix the following error:

    "set" directive is not allowed here

    move the directive to the server context block:

    server {
    set $servers_list "client1;client2";
    lua_code_cache off;
    ...