本篇内容主要讲解“nginx回源时bind ip的优化方法是什么”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“nginx回源时bind ip的优化方法是什么”吧!
简介
proxy_bind隶属于proxy_module，为向后端建立连接时的local ip，在nginx源码中只支持bind一个ip进行回源，若想使用多个ip进行回源时，可以修改源码支持bind ip数组。在实际应用中我就是这样做的。bind ip数据轮询选择ip进行回源与upstream建立连接，以解决单ip回源连接数限制问题。下面proxy_bind部分就是针对proxy_bind进行优化后的代码，支持bind多ip。
check_bind则是对源站进行健康检查所使用的源ip，在对upstream进行健康检查时，所使用的源ip与upstream建连根据响应进行判断健康状况，将健康检查所使用的ip组与业务回源使用的ip组进行区分开来。check_bind配置并不是nginx自带的功能需要对nginx进行二次开发。
proxy_bind
nginx源码配置：
{ ngx_string"proxy_bind"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
ngx_http_upstream_bind_set_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetofngx_http_proxy_loc_conf_t, upstream.local),
NULL },
改进后配置：
ngx_string"proxy_bind"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_http_upstream_bind_set_slot_array,
NGX_HTTP_LOC_CONF_OFFSET,
offsetofngx_http_proxy_loc_conf_t, upstream.local_array),
NULL },
下面是相关代码优化部分：
char *ngx_http_upstream_bind_set_slot_arrayngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
…
ngx_http_upstream_local_array_t **plocal, *local;
plocal = ngx_http_upstream_local_array_t **) p + cmd->offset);
if *plocal != NGX_CONF_UNSET_PTR) {
return "bind is duplicate";
}
value = cf->args->elts;
// 建立local array
local = ngx_pcalloccf->pool, sizeofngx_http_upstream_local_array_t));
*plocal = local;
// 建立local peer addr
local->addr = ngx_pcalloccf->pool, sizeofngx_peer_addrs_t));
// 建立addr array
local->addr->addrs = ngx_array_createcf->pool, 1, sizeofngx_addr_t));
// 遍历所有的local ip，放进array中
for i = 1; i < cf->args->nelts; i++) {
addr = ngx_array_pushlocal->addr->addrs);
if addr == NULL) {
return NGX_CONF_ERROR;
}
rc = ngx_parse_addrcf->pool, addr, value[i].data, value[i].len);
switch rc) {
case NGX_OK:
addr->name = value[i];
break;
case NGX_DECLINED:
ngx_conf_log_errorNGX_LOG_EMERG, cf, 0,
"invalid address \"%V\"", &value[i]);
/* fall through */
default:
return NGX_CONF_ERROR;
}
}
…
}
之后在init_request中将u→peer.local_array赋值为u→conf→local_array即刚刚通过指令赋值的)
static void ngx_http_upstream_init_requestngx_http_request_t *r)
{
…
u = r->upstream;
u->peer.local_array = ngx_http_upstream_get_local_arrayr, u->conf->local_array);
…
}
这个u→conf是如何获取的呢？其实是通过不同的handler获得的，比如我们tengine配置中常用的proxy_pass，就可以将这个赋值上去
static ngx_int_t ngx_http_proxy_handlerngx_http_request_t *r)
{
…
u = r->upstream;
// 获取proxy的loc conf
plcf = ngx_http_get_module_loc_confr, ngx_http_proxy_module);
// 获取对应的conf
u->conf = &plcf->upstream;
…
}
这个plcf->upstream→upstream是真正的upstream_srv_conf，是在proxy_pass中获取的
static char *ngx_http_proxy_passngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
…
plcf->upstream.upstream = ngx_http_upstream_addcf, &u, 0);
…
}
check_bind
增加chenk_bind模块
check_bind 在健康检查的main_conf中添加global_local。
ngx_string"check_bind"),
NGX_HTTP_MAIN_CONF|NGX_CONF_1MORE,
ngx_http_upstream_bind_set_slot_array,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetofngx_http_upstream_check_main_conf_t, global_local),
NULL,
typedef struct {
ngx_uint_t check_shm_size;
ngx_http_upstream_check_peers_t *peers;
ngx_http_upstream_local_array_t *global_local;
} ngx_http_upstream_check_main_conf_t;
接下来的操作和proxy_bind类似
char * ngx_http_upstream_bind_set_slot_arrayngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
…
// 这里的global是upstream_check_main_conf
…
}
将global_local存在ucmcf中之后，接下来要将这个global放到每个upstream中，也就是uscf
调用的是upstream_check的init_main方法
static char * ngx_http_upstream_check_init_main_confngx_conf_t *cf, void *conf)
{
…
// 拿到upstream module的main conf
umcf = ngx_http_conf_get_module_main_confcf, ngx_http_upstream_module);
// 拿到后端数组的指针
uscfp = umcf->upstreams.elts;
for i = 0; i < umcf->upstreams.nelts; i++) {
// 循环赋值
if ngx_http_upstream_check_init_srv_confcf, uscfp[i], ucmcf->global_local) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
…
}
static char * ngx_http_upstream_check_init_srv_confngx_conf_t *cf, void *conf,
ngx_http_upstream_local_array_t *global_local)
{
…
ngx_http_upstream_srv_conf_t *us = conf;
// 拿到这个upstream srv conf下的check module conf
ucscf = ngx_http_conf_upstream_srv_confus, ngx_http_upstream_check_module);
// 进行赋值
if ucscf->global_local == NGX_CONF_UNSET_PTR) {
if global_local != NGX_CONF_UNSET_PTR && global_local != NULL) {
ucscf->global_local = global_local;
}
}
…
}
如果dyups兼容的话，需要在add peer里面保证被赋值，同时添加peer
ngx_uint_t ngx_http_upstream_check_add_peerngx_conf_t *cf,
ngx_http_upstream_srv_conf_t *us, ngx_addr_t *peer_addr
#ifdef CONFIG_NGX_NS
, ngx_int_t vni, ngx_addr_t *hp_addr, ngx_addr_t *hp2_addr, __u8 *mac
#endif
)
{
…
//add check_bind support for dyups modules.
if ucscf->global_local == NGX_CONF_UNSET_PTR) {
if ucmcf->global_local != NGX_CONF_UNSET_PTR && ucmcf->global_local != NULL) {
ucscf->global_local = ucmcf->global_local;
}
}
// 添加peer
peers = ucmcf->peers;
peer = ngx_array_push&peers->peers);
peer->index = peers->peers.nelts – 1;
// 这部分很关键，上面刚刚赋值好global_local的ucscf被赋值为peer->conf
peer->conf = ucscf;
peer->upstream_name = &us->host;
peer->peer_addr = peer_addr;
…
}
在add_timer的时将这些handler全部赋值，data指定为上面生成的peer
static ngx_int_t ngx_http_upstream_check_add_timerngx_http_upstream_check_peer_t *peer,
ngx_check_conf_t *check_conf, ngx_msec_t timer, ngx_log_t *log)
{
…
peer->check_ev.handler = ngx_http_upstream_check_begin_handler;
peer->check_ev.log = log;
peer->check_ev.data = peer;
…
}
ngx_http_upstream_check_connect_handler 这是upstream check的时候调用的handler
static void ngx_http_upstream_check_begin_handlerngx_event_t *event)
{
…
if peer->shm->owner == ngx_pid) {
ngx_http_upstream_check_connect_handlerevent);
}
…
}
static void ngx_http_upstream_check_connect_handlerngx_event_t *event)
{
…
peer = event->data;
// peer的conf就是ucscf
ucscf = peer->conf;
// 赋值
if peer->conf->global_local != NGX_CONF_UNSET_PTR && peer->conf->global_local != NULL) {
peer->pc.local_array = peer->conf->global_local->addr;
} else {
peer->pc.local_array = NULL;
}
rc = ngx_event_connect_peer&peer->pc);
…
}