nginx调试日志的几种方法
参考章亦春的echo
http://wiki.nginx.org/HttpEchoModule
源码中有个ddebug.h里面定义的打印log都输出到stderr
所以在这个模块的源码中把开头的
[root@VM_253_237_tlinux echo]# cat ngx_http_echo_module.c /** Copyright (C) fabricehao*/#include <ngx_config.h>#include <ngx_core.h>#include <ngx_http.h>#include <time.h>#include "haolog.h"/* Module config */typedef struct { ngx_str_t ed;} ngx_http_echo_loc_conf_t;static char *ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);static void *ngx_http_echo_create_loc_conf(ngx_conf_t *cf);static char *ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);/* Directives */static ngx_command_t ngx_http_echo_commands[] = { { ngx_string("echo"), NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_echo, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_echo_loc_conf_t, ed), NULL }, ngx_null_command};/* Http context of the module */static ngx_http_module_t ngx_http_echo_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_echo_create_loc_conf, /* create location configration */ ngx_http_echo_merge_loc_conf /* merge location configration */};/* Module */ngx_module_t ngx_http_echo_module = { NGX_MODULE_V1, &ngx_http_echo_module_ctx, /* module context */ ngx_http_echo_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING};/* Handler function */static ngx_int_tngx_http_echo_handler(ngx_http_request_t *r){ DEBUG_LOG("haoning.........ngx_http_echo_handler"); ngx_int_t rc; ngx_buf_t *b; ngx_chain_t out; ngx_http_echo_loc_conf_t *elcf; elcf = ngx_http_get_module_loc_conf(r, ngx_http_echo_module); if(!(r->method & (NGX_HTTP_HEAD|NGX_HTTP_GET|NGX_HTTP_POST))) { return NGX_HTTP_NOT_ALLOWED; } r->headers_out.content_type.len = sizeof("text/html") - 1; r->headers_out.content_type.data = (u_char *) "text/html"; r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_length_n = elcf->ed.len; if(r->method == NGX_HTTP_HEAD) { DEBUG_LOG("haoning......ngx_http_echo_handlerr---r->method == NGX_HTTP_HEAD"); rc = ngx_http_send_header(r); if(rc != NGX_OK) { return rc; } } b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); if(b == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer."); return NGX_HTTP_INTERNAL_SERVER_ERROR; } out.buf = b; out.next = NULL; b->pos = elcf->ed.data; b->last = elcf->ed.data + (elcf->ed.len); b->memory = 1; b->last_buf = 1; rc = ngx_http_send_header(r); if(rc != NGX_OK) { return rc; } DEBUG_LOG("haoning......ngx_http_output_filter"); return ngx_http_output_filter(r, &out);}static char *ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf){ DEBUG_LOG("haoning --ngx_http_echo->>>>> init"); ngx_http_core_loc_conf_t *clcf; clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); clcf->handler = ngx_http_echo_handler; ngx_conf_set_str_slot(cf,cmd,conf); return NGX_CONF_OK;}static void *ngx_http_echo_create_loc_conf(ngx_conf_t *cf){ DEBUG_LOG("haoning --ngx_http_echo_create_loc_conf"); ngx_http_echo_loc_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_echo_loc_conf_t)); if (conf == NULL) { return NGX_CONF_ERROR; } conf->ed.len = 0; conf->ed.data = NULL; return conf;}static char *ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child){ DEBUG_LOG("haoning --ngx_http_echo_merge_loc_conf"); ngx_http_echo_loc_conf_t *prev = parent; ngx_http_echo_loc_conf_t *conf = child; ngx_conf_merge_str_value(conf->ed, prev->ed, ""); return NGX_CONF_OK;}[root@VM_253_237_tlinux echo]#