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doc: add health check
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README.md
59
README.md
@ -8,11 +8,12 @@
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frp is a fast reverse proxy to help you expose a local server behind a NAT or firewall to the internet. As of now, it supports tcp & udp, as well as http and https protocols, where requests can be forwarded to internal services by domain name.
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Now it also try to support p2p connect.
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## Table of Contents
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<!-- vim-markdown-toc GFM -->
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* [What can I do with frp?](#what-can-i-do-with-frp)
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* [Status](#status)
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* [Architecture](#architecture)
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* [Example Usage](#example-usage)
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@ -37,6 +38,7 @@ frp is a fast reverse proxy to help you expose a local server behind a NAT or fi
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* [Support KCP Protocol](#support-kcp-protocol)
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* [Connection Pool](#connection-pool)
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* [Load balancing](#load-balancing)
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* [Health Check](#health-check)
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* [Rewriting the Host Header](#rewriting-the-host-header)
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* [Set Headers In HTTP Request](#set-headers-in-http-request)
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* [Get Real IP](#get-real-ip)
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@ -55,11 +57,6 @@ frp is a fast reverse proxy to help you expose a local server behind a NAT or fi
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<!-- vim-markdown-toc -->
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## What can I do with frp?
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* Expose any http and https service behind a NAT or firewall to the internet by a server with public IP address(Name-based Virtual Host Support).
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* Expose any tcp or udp service behind a NAT or firewall to the internet by a server with public IP address.
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## Status
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frp is under development and you can try it with latest release version. Master branch for releasing stable version when dev branch for developing.
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@ -394,7 +391,7 @@ Then visit `http://[server_addr]:7500` to see dashboard, default username and pa
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### Authentication
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Since v0.10.0, you only need to set `token` in frps.ini and frpc.ini.
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`token` in frps.ini and frpc.ini should be same.
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### Encryption and Compression
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@ -536,6 +533,52 @@ group_key = 123
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Proxies in same group will accept connections from port 80 randomly.
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### Health Check
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Health check feature can help you achieve high availability with load balancing.
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Add `health_check_type = {type}` to enable health check.
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**type** can be tcp or http.
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Type tcp will dial the service port and type http will send a http rquest to service and require a 200 response.
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Type tcp configuration:
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```ini
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# frpc.ini
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[test1]
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type = tcp
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local_port = 22
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remote_port = 6000
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# enable tcp health check
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health_check_type = tcp
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# dial timeout seconds
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health_check_timeout_s = 3
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# if continuous failed in 3 times, the proxy will be removed from frps
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health_check_max_failed = 3
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# every 10 seconds will do a health check
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health_check_interval_s = 10
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```
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Type http configuration:
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```ini
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# frpc.ini
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[web]
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type = http
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local_ip = 127.0.0.1
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local_port = 80
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custom_domains = test.yourdomain.com
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# enable http health check
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health_check_type = http
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# frpc will send a GET http request '/status' to local http service
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# http service is alive when it return 2xx http response code
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health_check_url = /status
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health_check_interval_s = 10
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health_check_max_failed = 3
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health_check_timeout_s = 3
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```
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### Rewriting the Host Header
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When forwarding to a local port, frp does not modify the tunneled HTTP requests at all, they are copied to your server byte-for-byte as they are received. Some application servers use the Host header for determining which development site to display. For this reason, frp can rewrite your requests with a modified host header. Use the `host_header_rewrite` switch to rewrite incoming HTTP requests.
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@ -574,8 +617,6 @@ Features for http proxy only.
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You can get user's real IP from http request header `X-Forwarded-For` and `X-Real-IP`.
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**Note that now you can only get these two headers in first request of each user connection.**
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### Password protecting your web service
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Anyone who can guess your tunnel URL can access your local web server unless you protect it with a password.
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68
README_zh.md
68
README_zh.md
@ -4,13 +4,12 @@
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[README](README.md) | [中文文档](README_zh.md)
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frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp, udp, http, https 协议。
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frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp, udp 协议，为 http 和 https 应用协议提供了额外的能力，且尝试性支持了点对点穿透。
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## 目录
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<!-- vim-markdown-toc GFM -->
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* [frp 的作用](#frp-的作用)
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* [开发状态](#开发状态)
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* [架构](#架构)
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* [使用示例](#使用示例)
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@ -35,6 +34,7 @@ frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp
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* [底层通信可选 kcp 协议](#底层通信可选-kcp-协议)
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* [连接池](#连接池)
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* [负载均衡](#负载均衡)
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* [健康检查](#健康检查)
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* [修改 Host Header](#修改-host-header)
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* [设置 HTTP 请求的 header](#设置-http-请求的-header)
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* [获取用户真实 IP](#获取用户真实-ip)
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@ -53,15 +53,9 @@ frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp
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<!-- vim-markdown-toc -->
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## frp 的作用
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* 利用处于内网或防火墙后的机器，对外网环境提供 http 或 https 服务。
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* 对于 http, https 服务支持基于域名的虚拟主机，支持自定义域名绑定，使多个域名可以共用一个80端口。
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* 利用处于内网或防火墙后的机器，对外网环境提供 tcp 和 udp 服务，例如在家里通过 ssh 访问处于公司内网环境内的主机。
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## 开发状态
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frp 仍然处于前期开发阶段，未经充分测试与验证，不推荐用于生产环境。
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frp 仍然处于开发阶段，未经充分测试与验证，不推荐用于生产环境。
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master 分支用于发布稳定版本，dev 分支用于开发，您可以尝试下载最新的 release 版本进行测试。
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@ -394,6 +388,8 @@ frpc 会自动使用环境变量渲染配置文件模版，所有环境变量需
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通过浏览器查看 frp 的状态以及代理统计信息展示。
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**注：Dashboard 尚未针对大量的 proxy 数据展示做优化，如果出现 Dashboard 访问较慢的情况，请不要启用此功能。**
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需要在 frps.ini 中指定 dashboard 服务使用的端口，即可开启此功能：
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```ini
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@ -410,7 +406,7 @@ dashboard_pwd = admin
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### 身份验证
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从 v0.10.0 版本开始，所有 proxy 配置全部放在客户端(也就是之前版本的特权模式)，服务端和客户端的 common 配置中的 `token` 参数一致则身份验证通过。
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服务端和客户端的 common 配置中的 `token` 参数一致则身份验证通过。
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### 加密与压缩
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@ -564,6 +560,52 @@ group_key = 123
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要求 `group_key` 相同，做权限验证，且 `remote_port` 相同。
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### 健康检查
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通过给 proxy 加上健康检查的功能，可以在要反向代理的服务出现故障时，将这个服务从 frps 中摘除，搭配负载均衡的功能，可以用来实现高可用的架构，避免服务单点故障。
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在每一个 proxy 的配置下加上 `health_check_type = {type}` 来启用健康检查功能。
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**type** 目前可选 tcp 和 http。
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tcp 只要能够建立连接则认为服务正常，http 会发送一个 http 请求，服务需要返回 2xx 的状态码才会被认为正常。
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tcp 示例配置如下：
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```ini
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# frpc.ini
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[test1]
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type = tcp
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local_port = 22
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remote_port = 6000
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# 启用健康检查，类型为 tcp
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health_check_type = tcp
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# 建立连接超时时间为 3 秒
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health_check_timeout_s = 3
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# 连续 3 次检查失败，此 proxy 会被摘除
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health_check_max_failed = 3
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# 每隔 10 秒进行一次健康检查
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health_check_interval_s = 10
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```
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http 示例配置如下：
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```ini
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# frpc.ini
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[web]
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type = http
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local_ip = 127.0.0.1
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local_port = 80
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custom_domains = test.yourdomain.com
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# 启用健康检查，类型为 http
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health_check_type = http
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# 健康检查发送 http 请求的 url，后端服务需要返回 2xx 的 http 状态码
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health_check_url = /status
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health_check_interval_s = 10
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health_check_max_failed = 3
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health_check_timeout_s = 3
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```
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### 修改 Host Header
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通常情况下 frp 不会修改转发的任何数据。但有一些后端服务会根据 http 请求 header 中的 host 字段来展现不同的网站，例如 nginx 的虚拟主机服务，启用 host-header 的修改功能可以动态修改 http 请求中的 host 字段。该功能仅限于 http 类型的代理。
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@ -599,8 +641,6 @@ header_X-From-Where = frp
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目前只有 **http** 类型的代理支持这一功能，可以通过用户请求的 header 中的 `X-Forwarded-For` 和 `X-Real-IP` 来获取用户真实 IP。
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**需要注意的是，目前只在每一个用户连接的第一个 HTTP 请求中添加了这两个 header。**
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### 通过密码保护你的 web 服务
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由于所有客户端共用一个 frps 的 http 服务端口，任何知道你的域名和 url 的人都能访问到你部署在内网的 web 服务，但是在某些场景下需要确保只有限定的用户才能访问。
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@ -647,7 +687,7 @@ subdomain = test
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frps 和 frpc 都启动成功后，通过 `test.frps.com` 就可以访问到内网的 web 服务。
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需要注意的是如果 frps 配置了 `subdomain_host`，则 `custom_domains` 中不能是属于 `subdomain_host` 的子域名或者泛域名。
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**注：如果 frps 配置了 `subdomain_host`，则 `custom_domains` 中不能是属于 `subdomain_host` 的子域名或者泛域名。**
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同一个 http 或 https 类型的代理中 `custom_domains` 和 `subdomain` 可以同时配置。
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@ -736,8 +776,6 @@ plugin_http_passwd = abc
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计划在后续版本中加入的功能与优化，排名不分先后，如果有其他功能建议欢迎在 [issues](https://github.com/fatedier/frp/issues) 中反馈。
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* frps 记录 http 请求日志。
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* frps 支持直接反向代理，类似 haproxy。
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* 集成对 k8s 等平台的支持。
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## 为 frp 做贡献
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@ -76,9 +76,12 @@ group_key = 123456
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# enable health check for the backend service, it support 'tcp' and 'http' now
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# frpc will connect local service's port to detect it's healthy status
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health_check_type = tcp
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health_check_interval_s = 10
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health_check_max_failed = 1
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# health check connection timeout
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health_check_timeout_s = 3
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# if continuous failed in 3 times, the proxy will be removed from frps
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health_check_max_failed = 3
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# every 10 seconds will do a health check
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health_check_interval_s = 10
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[ssh_random]
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type = tcp
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@ -137,6 +140,8 @@ health_check_type = http
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# http service is alive when it return 2xx http response code
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health_check_url = /status
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health_check_interval_s = 10
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health_check_max_failed = 3
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health_check_timeout_s = 3
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[web02]
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type = https
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