#ip_hash語法：
upstream backend {
    ip_hash;
    server backend1.example.com;
    server backend2.example.com;
    server backend3.example.com down;
}

//編譯安裝sticky模塊
//給yum安裝的nginx添加模塊（1.24最新的版本重新編譯安裝會報錯，1.18的不會報錯，版本兼容性的問題）
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//安裝編譯環(huán)境
[root@nginx-server ~]# yum install -y pcre* openssl* gcc gcc-c++ make 
[root@nginx-server ~]# wget  https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/get/08a395c66e42.zip  //下載sticky模塊
[root@nginx-server ~]# nginx -v
nginx version: nginx/1.18.0
[root@nginx-server ~]# wget  http://nginx.org/download/nginx-1.18.0.tar.gz    #下載yum安裝nginx對應版本的源碼包
[root@nginx-server ~]# yum install -y unzip    //安裝解壓工具
[root@nginx-server ~]# unzip 08a395c66e42.zip    //解壓模塊包
[root@nginx-server ~]# mv nginx-goodies-nginx-sticky-module-ng-08a395c66e42/ nginx-sticky-module-ng/
[root@nginx-server ~]# tar xzvf nginx-1.18.0.tar.gz -C /usr/local/    //解壓nginx的源碼包
[root@nginx-server ~]# cd /usr/local/nginx-1.18.0/
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[root@nginx-server nginx-1.18.0]# nginx -V    //查看yum安裝nginx所有模塊
[root@nginx-server nginx-1.18.0]# ./configure --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --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-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --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' --add-module=/root/nginx-sticky-module-ng
[root@nginx-server nginx-1.18.0]# make && make install
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//配置基于cookie會話保持
[root@nginx-server conf.d]# vim upstream.conf
upstream jianglt {
        server 192.168.221.136;
        server 192.168.221.138;
        sticky;
}
server {
    listen       80;
    server_name   www.test.com;
    charset utf-8;
    #access_log  /var/log/nginx/host.access.log  main;
    location / {
        proxy_pass http://jianglt;
    }
}
[root@nginx-server conf.d]# nginx -t 
[root@nginx-server conf.d]# nginx -s reload
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//或者：
upstream jianglt {
        server 192.168.221.136;
        server 192.168.221.138;
        sticky expires=1h domain=testpm.com path=/;
}