负载均衡后端状态监控模块

1.安装依赖

[root@lb02 ~]# yum install -y gcc glibc gcc-c++ pcre-devel openssl-devel patch

2.下载安装包

[root@lb02 ~]# wget http://nginx.org/download/nginx-1.14.2.tar.gz
[root@lb02 ~]# wget https://github.com/yaoweibin/nginx_upstream_check_module/archive/master.zip

3.解压安装包

[root@lb02 ~]# tar xf nginx-1.14.2.tar.gz
[root@lb02 ~]# unzip master.zip

4.打补丁并编译安装

[root@lb02 ~]# cd nginx-1.14.2/
[root@lb02 nginx-1.14.2]# patch -p1 <../nginx_upstream_check_module-master/check_1.14.0+.patch
[root@lb02 nginx-1.14.2]# ./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 --add-module=/root/nginx_upstream_check_module-master --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'
[root@lb02 nginx-1.14.2]# make && make install

5.配置健康检查模块

[root@lb01 ~]# vim /etc/nginx/conf.d/upstream.conf 
upstream upstream {
    server 10.0.0.7:80;
    server 10.0.0.8:80;
    server 10.0.0.8:80;
    check interval=3000 rise=1 fall=3 timeout=1000 type=tcp;
    #interval  检测间隔时间，单位为毫秒
    #rise      表示请求2次正常，标记此后端的状态为up
    #fall      表示请求3次失败，标记此后端的状态为down
    #type      类型为tcp
    #timeout   超时时间，单位为毫秒
}

server {
    listen 80;
    server_name blog.linux.com zh.linux.com;

    location / {
        proxy_pass http://upstream;
        include proxy_params;
        #proxy_next_upstream error timeout http_500 http_502 http_503 http_504;
    }

    location /check {
        check_status;
    }
}

负载均衡会话保持

1.会话保持方法

1.session保存在本地  --->  nfs共享目录
2.通过程序将session写入数据库  --->  保存在磁盘
3.通过程序将session存储在redis  --->  保存在内存数据库

2.搭建phpmyadmin

1）下载安装包

[root@web01 ~]# cd /code
[root@web01 code]# wget https://files.phpmyadmin.net/phpMyAdmin/4.9.2/phpMyAdmin-4.9.2-all-languages.zip

2）解压安装包

[root@web01 code]# unzip phpMyAdmin-4.9.2-all-languages.zip

3）配置phpmyadmin连接数据库配置

[root@web01 code]# cd phpMyAdmin-4.9.2-all-languages
[root@web01 phpMyAdmin-4.9.2-all-languages]# cp config.sample.inc.php config.inc.php
[root@web01 phpMyAdmin-4.9.2-all-languages]# vim config.inc.php
$cfg['Servers'][$i]['host'] = '172.16.1.51';

4）授权目录

[root@web01 phpMyAdmin-4.9.2-all-languages]# cd /code/
[root@web01 code]# chown -R www.www phpMyAdmin-4.9.2-all-languages

5）配置nginx

[root@web01 conf.d]# vim /etc/nginx/conf.d/php.conf 
server {
    listen 80;
    server_name php.linux.com;

    location / {
        root /code/phpMyAdmin-4.9.2-all-languages;
        index index.php;
    }

    location ~ \.php$ {
        root /code/phpMyAdmin-4.9.2-all-languages;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

6）修改host访问测试

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-KccVy0MV-1577167976644)(C:\Users\oldboy\AppData\Roaming\Typora\typora-user-images\1577152832441.png)]

#页面如上报错，需要修改存储seesion目录权限
[root@web01 ~]# chown -R www.www /var/lib/php/session/

7）把web01的配置同步到web02

[root@web01 ~]# scp -r /code/phpMyAdmin-4.9.2-all-languages 172.16.1.8:/code/
[root@web01 ~]# scp /etc/nginx/conf.d/php.conf 172.16.1.8:/etc/nginx/conf.d/

8）重启nginx

[root@web02 ~]# systemctl restart nginx
[root@web02 ~]# chown -R www.www /var/lib/php/session/

9）授权页面使用root登录（只是为了看到所有数据库，可以不设置）

[root@db01 ~]# mysql -u root -p
Enter password:

MariaDB [(none)]> grant all on *.* to root@'172.16.1.%' identified by '123456';

10）配置phpmyadmin接入负载均衡

[root@lb01 ~]# cd /etc/nginx/conf.d/
[root@lb01 conf.d]# vim php_upstream.conf
upstream php {
    server 10.0.0.7:80;
    server 10.0.0.8:80;
}

server {
    listen 80;
    server_name php.linux.com;

    location / {
        proxy_pass http://php;
        include proxy_params; 
    }
}

[root@lb01 conf.d]# systemctl restart nginx

11）配置host，访问页面

3.使用redis实现session共享

1）安装redis

[root@db01 ~]# yum install -y redis

2）修改redis配置文件

[root@db01 ~]# vim /etc/redis.conf
bind 127.0.0.1 172.16.1.51

3）启动redis

[root@db01 ~]# systemctl start redis

4）配置php将session存储到redis

[root@web01 ~]# vim /etc/php-fpm.d/www.conf
;php_value[session.save_handler] = files
;php_value[session.save_path]    = /var/lib/php/session

[root@web01 ~]# vim /etc/php.ini
session.save_handler = redis
session.save_path = "tcp://172.16.1.51:6379"
session.auto_start = 1

5）同步php配置至web02

[root@web01 ~]# scp /etc/php-fpm.d/www.conf 172.16.1.8:/etc/php-fpm.d/
[root@web01 ~]# scp /etc/php.ini 172.16.1.8:/etc/

6）配置完php，重启

[root@web01 ~]# systemctl restart php-fpm