测试环境:
1.ubuntu 18.04
2.nginx-1.15.6
实验:
1.基于nginx-1.15.6添加debug code
static int lucount = 0;
ngx_http_upstream_round_robin.c
static ngx_http_upstream_rr_peer_t *
ngx_http_upstream_get_peer(ngx_peer_connection_t *pc,ngx_http_upstream_rr_peer_data_t *rrp)
{
time_t now;
uintptr_t m;
ngx_int_t total;
ngx_uint_t i, n, p;
ngx_http_upstream_rr_peer_t *peer, *best;
now = ngx_time();
best = NULL;
total = 0;
#if (NGX_SUPPRESS_WARN)
p = 0;
#endif
//ngx_http_upstream_init_round_robin(){ us->peer.data = peers; }
//ngx_http_upstream_init_round_robin_peer() { rrp->peers = us->peer.data; }
for (peer = rrp->peers->peer, i = 0;
peer;
peer = peer->next, i++)
{
n = i / (8 * sizeof(uintptr_t));
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
if (rrp->tried[n] & m) {
continue;
}
if (peer->down) {
continue;
}
if (peer->max_fails
&& peer->fails >= peer->max_fails
&& now - peer->checked <= peer->fail_timeout)
{
ngx_log_debug(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 544");
continue;
}
if (peer->max_conns && peer->conns >= peer->max_conns) {
ngx_log_debug(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 549");
continue;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 552 peer->current_weight = %d peer->name = %V",peer->current_weight,&peer->name);
peer->current_weight += peer->effective_weight;
total += peer->effective_weight;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 555 peer->current_weight = %d peer->effective_weight = %d peer->name = %V",peer->current_weight,peer->effective_weight,&peer->name);
if (peer->effective_weight < peer->weight) {
peer->effective_weight++;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 558 peer->weight = %d peer->effective_weight = %d",peer->weight,peer->effective_weight);
}
if (best == NULL || peer->current_weight > best->current_weight) {
best = peer;
p = i;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 563 i = %d",i);
}
}
if (best == NULL) {
return NULL;
}
rrp->current = best;
n = p / (8 * sizeof(uintptr_t));
m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
rrp->tried[n] |= m;
best->current_weight -= total;
rrp->peers->count = rrp->peers->count + 1;
lucount = lucount + 1;
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, pc->log, 0,"ngx_http_upstream_get_peer() 578 rrp->tried[n] = %d best->name = %V best->current_weight = %d rrp->peers->count = %d lucount = %d getpid() = %d",rrp->tried[n],&best->name,best->current_weight,rrp->peers->count,lucount,getpid());
if (now - best->checked > best->fail_timeout) {
best->checked = now;
}
return best;
}
2.开启4个nginx服务，一个作为server三个作为local
(1)server nginx.conf基于模板更改如下:
#user nobody;
worker_processes 4;
daemon off;
error_log /home/chro/nginx/logs/error.log;
error_log /home/chro/nginx/logs/error.log notice;
error_log /home/chro/nginx/logs/error.log info;
error_log /home/chro/nginx/logs/error.log debug;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
upstream linuxidc {
server 0.0.0.0:7080 weight=1;
server 0.0.0.0:8080 weight=2;
server 0.0.0.0:9080 weight=3;
}
sendfile on;
keepalive_timeout 65;
server {
listen 6080;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /res {
proxy_pass
}
# redirect server error pages to the static page /50x.html
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
(1)local nginx.conf基于模板更改如下:
#user nobody;
worker_processes 4;
daemon off;
error_log /home/chro/nginx/logs/error1.log;
error_log /home/chro/nginx/logs/error1.log notice;
error_log /home/chro/nginx/logs/error1.log info;
error_log /home/chro/nginx/logs/error1.log debug;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
#gzip on;
server {
#参照server中upstream的port设定，更改listen port 8080,9080再添加两份nginx.conf
listen 7080;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /res {
alias /home/chro/linux;
autoindex on;
}
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
3.在浏览器中输入localhost:6080/res n+个窗口，得到debug信息
(1)2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:7080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 555 peer->current_weight = 1 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:8080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:9080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 563 i = 2
2021/12/22 15:01:56 [debug] 4752#0: *1 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 4 best->name = 0.0.0.0:9080 best->current_weight = -3 rrp->peers->count = 1 lucount = 1 getpid() = 4752
(2)2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:7080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 555 peer->current_weight = 1 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:8080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:9080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 563 i = 2
2021/12/22 15:01:59 [debug] 4753#0: *2 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 4 best->name = 0.0.0.0:9080 best->current_weight = -3 rrp->peers->count = 1 lucount = 1 getpid() = 4753
(3)2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:7080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 555 peer->current_weight = 1 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:8080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:9080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 563 i = 2
2021/12/22 15:02:01 [debug] 4754#0: *3 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 4 best->name = 0.0.0.0:9080 best->current_weight = -3 rrp->peers->count = 1 lucount = 1 getpid() = 4754
(4)2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 552 peer->current_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 552 peer->current_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 555 peer->current_weight = 4 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 552 peer->current_weight = -3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 555 peer->current_weight = 0 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:11 [debug] 4754#0: *9 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 2 best->name = 0.0.0.0:8080 best->current_weight = -2 rrp->peers->count = 2 lucount = 2 getpid() = 4754
(5)2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:7080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 555 peer->current_weight = 1 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:8080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:9080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 563 i = 2
2021/12/22 15:02:02 [debug] 4755#0: *4 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 4 best->name = 0.0.0.0:9080 best->current_weight = -3 rrp->peers->count = 1 lucount = 1 getpid() = 4755
(6)2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 552 peer->current_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 552 peer->current_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 555 peer->current_weight = 4 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 552 peer->current_weight = -3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 555 peer->current_weight = 0 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:12 [debug] 4755#0: *12 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 2 best->name = 0.0.0.0:8080 best->current_weight = -2 rrp->peers->count = 2 lucount = 2 getpid() = 4755
(7)2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 552 peer->current_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 552 peer->current_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 555 peer->current_weight = 4 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 552 peer->current_weight = -3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 555 peer->current_weight = 0 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:06 [debug] 4752#0: *5 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 2 best->name = 0.0.0.0:8080 best->current_weight = -2 rrp->peers->count = 2 lucount = 2 getpid() = 4752
(8)2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 552 peer->current_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 555 peer->current_weight = 2 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 552 peer->current_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 555 peer->current_weight = 4 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 563 i = 1
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 552 peer->current_weight = -3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 555 peer->current_weight = 0 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:09 [debug] 4753#0: *7 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 2 best->name = 0.0.0.0:8080 best->current_weight = -2 rrp->peers->count = 2 lucount = 2 getpid() = 4753
(9)2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 552 peer->current_weight = 2 peer->name = 0.0.0.0:7080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 1 peer->name = 0.0.0.0:7080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 563 i = 0
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 552 peer->current_weight = -2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 555 peer->current_weight = 0 peer->effective_weight = 2 peer->name = 0.0.0.0:8080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 552 peer->current_weight = 0 peer->name = 0.0.0.0:9080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 555 peer->current_weight = 3 peer->effective_weight = 3 peer->name = 0.0.0.0:9080
2021/12/22 15:02:19 [debug] 4753#0: *17 ngx_http_upstream_get_peer() 578 rrp->tried[n] = 1 best->name = 0.0.0.0:7080 best->current_weight = -3 rrp->peers->count = 3 lucount = 3 getpid() = 4753
参考文档: https:// digest/ understandingnginx/ 202586
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