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81 lines
3.4 KiB
Markdown
81 lines
3.4 KiB
Markdown
---
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title: Debug Mode
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---
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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-->
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### 基本调试模式
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设置 `conf/config.yaml` 中的 `apisix.enable_debug` 为 `true`，即可开启基本调试模式。
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比如对 `/hello` 开启了 `limit-conn`和`limit-count`插件，这时候应答头中会有 `Apisix-Plugins: limit-conn, limit-count`。
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```shell
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$ curl http://127.0.0.1:1984/hello -i
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HTTP/1.1 200 OK
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Content-Type: text/plain
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Transfer-Encoding: chunked
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Connection: keep-alive
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Apisix-Plugins: limit-conn, limit-count
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X-RateLimit-Limit: 2
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X-RateLimit-Remaining: 1
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Server: openresty
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hello world
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```
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如果这个信息无法通过 HTTP 应答头传递，比如插件在 stream 子系统里面执行，
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那么这个信息会以 warn 等级日志写入到错误日志中。
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### 高级调试模式
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设置 `conf/debug.yaml` 中的选项，开启高级调试模式。由于 APISIX 服务启动后是每秒定期检查该文件，
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当可以正常读取到 `#END` 结尾时，才认为文件处于写完关闭状态。
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根据文件最后修改时间判断文件内容是否有变化，如有变化则重新加载，如没变化则跳过本次检查。
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所以高级调试模式的开启、关闭都是热更新方式完成。
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| 名字 | 可选项 | 说明 | 默认值 |
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| ------------------------------- | ------ | ------------------------------------------------------------------ | ------ |
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| hook_conf.enable | 必选项 | 是否开启 hook 追踪调试。开启后将打印指定模块方法的请求参数或返回值 | false |
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| hook_conf.name | 必选项 | 开启 hook 追踪调试的模块列表名称 | |
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| hook_conf.log_level | 必选项 | 打印请求参数和返回值的日志级别 | warn |
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| hook_conf.is_print_input_args | 必选项 | 是否打印输入参数 | true |
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| hook_conf.is_print_return_value | 必选项 | 是否打印返回值 | true |
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请看下面示例：
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```yaml
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hook_conf:
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enable: false # 是否开启 hook 追踪调试
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name: hook_phase # 开启 hook 追踪调试的模块列表名称
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log_level: warn # 日志级别
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is_print_input_args: true # 是否打印输入参数
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is_print_return_value: true # 是否打印返回值
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hook_phase: # 模块函数列表，名字：hook_phase
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apisix: # 引用的模块名称
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- http_access_phase # 函数名：数组
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- http_header_filter_phase
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- http_body_filter_phase
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- http_log_phase
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#END
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```
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