nginx + lua收集网站状态码

在http中加入，可以统计5分钟网站所有状态码个数

lua_shared_dict my_status 32m;
    log_by_lua_block {
        local akin = ngx.shared.my_status
        local five = math.floor(os.time()/300)*300
        local date = os.date("%Y%m%d%H%M",five)
        local httpcode = ngx.var.host .. "_" .. ngx.var.status .. "_" .. date
        --- ngx.log(ngx.ERR, httpcode)
        local value = akin:get(httpcode)
        if not value then
            akin:set(httpcode,1, 30*60)
            --- akin:expire(httpcode, 30*60)
            value=1
        end
        akin:incr(httpcode,1)

    }