Using Openresty Balancer_by_lua to implement a simple ip_hash upstream scheduling

The following is based on the Openresty balancer_by_lua configuration directive, which uses Ngx.crc32_long to generate a hash from the source address and destination port to achieve a simple ip_hash upstream. For reference only

Upstream backend{
    server 0.0.0.0;
    Balancer_by_lua_block {
        Local balancer = require "Ngx.balancer"
        Local host = {"192.168.1.111", "192.168.1.112"}
        Local backend = ""
        Local port = ngx.var.server_port
        Local remote_ip = ngx.var.remote_addr
        local key = REM Ote_ip. Port
        Local hash = Ngx.crc32_long (key);
        hash = (hash% 2) + 1
        backend = Host[hash]
        ngx.log (NGX. DEBUG, "ip_hash=", Ngx.var.remote_addr, "hash=", Hash, "up=", Backend, ":", port)
        local OK, err = Balancer.set_curr Ent_peer (backend, port)
        if not OK then
            Ngx.log (NGX. Err, "Failed to set the current peer:", err)
            return Ngx.exit ($)
        end
        Ngx.log (NGX. DEBUG, "current peer", backend, ":", Port)
    }
}

server {
	listen;
	Listen 8080;
	Listen 7777;
	server_name *.x.com location
	/{
		proxy_pass http://backend;
	}
}

Reference:

Https://github.com/openresty/lua-nginx-module