01 openresty监控

openresty 监控

nginx-lua-prometheus

github 地址:

这是一个 lua 的库, 可以和nginx 一起来跟踪指标, 并将他们公布在单独的网页上, 由prometheus 拉取.

安装

安装此库, 需要安装ngx_lua 模块, 可以简单的安装 libnginx-mod-http-lua

库文件 - prometheus.lua - 需要在 中 LUA_PATH 可用。如果这是您使用的唯一 Lua 库，则只需指向 lua_package_path 签出此 git 存储库的目录（请参阅下面的示例）。

openresty 在 opm 中可用, 他可以通过luarocks.获取

$ opm get knyar/nginx-lua-prometheus
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_US.UTF-8",
        LC_ALL = "en_US.UTF-8",
        LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
* Fetching knyar/nginx-lua-prometheus  
  Downloading https://opm.openresty.org/api/pkg/tarball/knyar/nginx-lua-prometheus-0.20230607.opm.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 19265  100 19265    0     0   7056      0  0:00:02  0:00:02 --:--:--  7056
Package knyar/nginx-lua-prometheus 0.20230607 installed successfully under /usr/local/openresty/site/ .

查看文件是否存在:

$ ls /usr/local/openresty/site/lualib/prometheus.lua
/usr/local/openresty/site/lualib/prometheus.lua

配置使用

1、 先在nginx.conf 中的 http 模块中加入如下配置

    lua_shared_dict prometheus_metrics 10M; 
    lua_package_path "/usr/local/openresty/site/lualib/?.lua;;";

    init_worker_by_lua_block {
        prometheus = require("prometheus").init("prometheus_metrics")

        metric_requests = prometheus:counter(
          "nginx_http_requests_total", "Number of HTTP requests", {"host", "status", "request_uri", "request_method"})
        metric_latency = prometheus:histogram(
          "nginx_http_request_duration_seconds", "HTTP request latency", {"host", "status", "request_uri", "request_method"})
        metric_connections = prometheus:gauge(
          "nginx_http_connections", "Number of HTTP connections", {"state"})
    }

    log_by_lua_block {
      metric_requests:inc(1, {ngx.var.server_name, ngx.var.status, ngx.var.request_uri, ngx.var.request_method})
      metric_latency:observe(tonumber(ngx.var.request_time), {ngx.var.server_name, ngx.var.status, ngx.var.request_uri, ngx.var.request_method})
    } # https://cdn.console.aliyun.com/domain/detail/cdn.bigquant.com/backSrc

2、配置监控使用的server

server {
  listen 9145;
  server_name _;
  allow 10.160.0.0/16;
  allow 10.96.0.0/12;
  deny all;
  location /metrics {
    content_by_lua_block {
      metric_connections:set(ngx.var.connections_reading, {"reading"})
      metric_connections:set(ngx.var.connections_waiting, {"waiting"})
      metric_connections:set(ngx.var.connections_writing, {"writing"})
      prometheus:collect()
    }
  }
}