nginx实现通过ip地址做iphash - 少年老余

1.nginx源码下载：https://nginx.org/download/nginx-1.26.2.tar.gz

2.解压并修改ngx_http_upstream_ip_hash_module.c

完整内容

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


typedef struct {
    /* the round robin data must be first */
    ngx_http_upstream_rr_peer_data_t   rrp;

    ngx_uint_t                         hash;

    u_char                             addrlen;
    u_char                            *addr;

    u_char                             tries;

    ngx_event_get_peer_pt              get_rr_peer;
} ngx_http_upstream_ip_hash_peer_data_t;


static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
    ngx_http_upstream_srv_conf_t *us);
static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc,
    void *data);
static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


static ngx_command_t  ngx_http_upstream_ip_hash_commands[] = {

    { ngx_string("ip_hash"),
      NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
      ngx_http_upstream_ip_hash,
      0,
      0,
      NULL },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_upstream_ip_hash_module_ctx = {
    NULL,                                  /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    NULL,                                  /* create location configuration */
    NULL                                   /* merge location configuration */
};


ngx_module_t  ngx_http_upstream_ip_hash_module = {
    NGX_MODULE_V1,
    &ngx_http_upstream_ip_hash_module_ctx, /* module context */
    ngx_http_upstream_ip_hash_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
};


static u_char ngx_http_upstream_ip_hash_pseudo_addr[4];


static ngx_int_t
ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
{
    if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
        return NGX_ERROR;
    }

    us->peer.init = ngx_http_upstream_init_ip_hash_peer;

    return NGX_OK;
}


static ngx_int_t
ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
    ngx_http_upstream_srv_conf_t *us)
{
    struct sockaddr_in                     *sin;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6                    *sin6;
#endif
    ngx_http_upstream_ip_hash_peer_data_t  *iphp;

    iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t));
    if (iphp == NULL) {
        return NGX_ERROR;
    }

    r->upstream->peer.data = &iphp->rrp;

    if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
        return NGX_ERROR;
    }

    r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer;

    switch (r->connection->sockaddr->sa_family) {

    case AF_INET:
        sin = (struct sockaddr_in *) r->connection->sockaddr;
        iphp->addr = (u_char *) &sin->sin_addr.s_addr;
        iphp->addrlen = 4;
        break;

#if (NGX_HAVE_INET6)
    case AF_INET6:
        sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
        iphp->addr = (u_char *) &sin6->sin6_addr.s6_addr;
        iphp->addrlen = 16;
        break;
#endif

    default:
        iphp->addr = ngx_http_upstream_ip_hash_pseudo_addr;
        iphp->addrlen = 4;
    }

    iphp->hash = 89;
    iphp->tries = 0;
    iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;

    return NGX_OK;
}


static ngx_int_t
ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
{
    ngx_http_upstream_ip_hash_peer_data_t  *iphp = data;

    time_t                        now;
    ngx_int_t                     w;
    uintptr_t                     m;
    ngx_uint_t                    i, n, p, hash;
    ngx_http_upstream_rr_peer_t  *peer;

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
                   "get ip hash peer, try: %ui", pc->tries);

    /* TODO: cached */

    ngx_http_upstream_rr_peers_rlock(iphp->rrp.peers);

    if (iphp->tries > 20 || iphp->rrp.peers->single) {
        ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);
        return iphp->get_rr_peer(pc, &iphp->rrp);
    }

    now = ngx_time();

    pc->cached = 0;
    pc->connection = NULL;

    hash = iphp->hash;

    for ( ;; ) {

        for (i = 0; i < (ngx_uint_t) iphp->addrlen; i++) {
            hash = (hash * 113 + iphp->addr[i]) % 6271;
        }

        w = hash % iphp->rrp.peers->total_weight;
        peer = iphp->rrp.peers->peer;
        p = 0;

        while (w >= peer->weight) {
            w -= peer->weight;
            peer = peer->next;
            p++;
        }

        n = p / (8 * sizeof(uintptr_t));
        m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));

        if (iphp->rrp.tried[n] & m) {
            goto next;
        }

        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
                       "get ip hash peer, hash: %ui %04XL", p, (uint64_t) m);

        ngx_http_upstream_rr_peer_lock(iphp->rrp.peers, peer);

        if (peer->down) {
            ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer);
            goto next;
        }

        if (peer->max_fails
            && peer->fails >= peer->max_fails
            && now - peer->checked <= peer->fail_timeout)
        {
            ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer);
            goto next;
        }

        if (peer->max_conns && peer->conns >= peer->max_conns) {
            ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer);
            goto next;
        }

        break;

    next:

        if (++iphp->tries > 20) {
            ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);
            return iphp->get_rr_peer(pc, &iphp->rrp);
        }
    }

    iphp->rrp.current = peer;

    pc->sockaddr = peer->sockaddr;
    pc->socklen = peer->socklen;
    pc->name = &peer->name;

    peer->conns++;

    if (now - peer->checked > peer->fail_timeout) {
        peer->checked = now;
    }

    ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer);
    ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);

    iphp->rrp.tried[n] |= m;
    iphp->hash = hash;

    return NGX_OK;
}


static char *
ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_upstream_srv_conf_t  *uscf;

    uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);

    if (uscf->peer.init_upstream) {
        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                           "load balancing method redefined");
    }

    uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash;

    uscf->flags = NGX_HTTP_UPSTREAM_CREATE
                  |NGX_HTTP_UPSTREAM_WEIGHT
                  |NGX_HTTP_UPSTREAM_MAX_CONNS
                  |NGX_HTTP_UPSTREAM_MAX_FAILS
                  |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
                  |NGX_HTTP_UPSTREAM_DOWN;

    return NGX_CONF_OK;
}

View Code

\nginx-1.26.2\src\http\modules\ngx_http_upstream_ip_hash_module.c
80行：static u_char ngx_http_upstream_ip_hash_pseudo_addr[4];
124行：iphp->addrlen = 4;
137行：iphp->addrlen = 4;

3.编译nginx

cd nginx-1.26.2 
chmod +x configure 
./configure --prefix=/opt/nginx/ --user=nginx --group=nginx --with-compat --with-debug --with-file-aio  --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_degradation_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_mp4_module --with-http_perl_module=dynamic --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-http_xslt_module=dynamic --with-mail=dynamic --with-mail_ssl_module --with-pcre --with-pcre-jit --with-stream=dynamic --with-stream_ssl_module --with-stream_ssl_preread_module --with-threads --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie
make
make install

4.起服务验证

nginx配置

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  '"远程地址：" $remote_addr - "访问地址:" "$upstream_addr" - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "真实地址"  "$http_x_forwarded_for"';

    access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
    upstream backup {
      ip_hash;
      #server www.baidu.com;
      server 192.168.2.130:60;
      server 192.168.2.130:9000;
      #server 192.168.3.68:82;

    }
    server {
        listen       80;
        server_name  localhost;

    set_real_ip_from   0.0.0.0/0; # 信任所有来源的IP  
        real_ip_header     X-Forwarded-For; # 从这个头获取真实的IP  
        real_ip_recursive  on; # 递归地查找IP  
        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
        proxy_pass http://backup;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $http_connection;
            proxy_set_header Connection keep-alive;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_set_header real-ip $remote_addr;
            proxy_cache_bypass $http_upgrade;
            proxy_read_timeout 7200;
            port_in_redirect on;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

View Code

日志：

5.结论

相同网段，不同ip地址可以到不同后端服务

相同ip地址固定同一个后端服务

发表于 2024-08-17 16:23 少年老余阅读(70) 评论(0) 编辑收藏举报